busybox/archival/dpkg.c
James Byrne 6937487be7 libbb: reduce the overhead of single parameter bb_error_msg() calls
Back in 2007, commit 0c97c9d437 ("'simple' error message functions by
Loic Grenie") introduced bb_simple_perror_msg() to allow for a lower
overhead call to bb_perror_msg() when only a string was being printed
with no parameters. This saves space for some CPU architectures because
it avoids the overhead of a call to a variadic function. However there
has never been a simple version of bb_error_msg(), and since 2007 many
new calls to bb_perror_msg() have been added that only take a single
parameter and so could have been using bb_simple_perror_message().

This changeset introduces 'simple' versions of bb_info_msg(),
bb_error_msg(), bb_error_msg_and_die(), bb_herror_msg() and
bb_herror_msg_and_die(), and replaces all calls that only take a
single parameter, or use something like ("%s", arg), with calls to the
corresponding 'simple' version.

Since it is likely that single parameter calls to the variadic functions
may be accidentally reintroduced in the future a new debugging config
option WARN_SIMPLE_MSG has been introduced. This uses some macro magic
which will cause any such calls to generate a warning, but this is
turned off by default to avoid use of the unpleasant macros in normal
circumstances.

This is a large changeset due to the number of calls that have been
replaced. The only files that contain changes other than simple
substitution of function calls are libbb.h, libbb/herror_msg.c,
libbb/verror_msg.c and libbb/xfuncs_printf.c. In miscutils/devfsd.c,
networking/udhcp/common.h and util-linux/mdev.c additonal macros have
been added for logging so that single parameter and multiple parameter
logging variants exist.

The amount of space saved varies considerably by architecture, and was
found to be as follows (for 'defconfig' using GCC 7.4):

Arm:     -92 bytes
MIPS:    -52 bytes
PPC:   -1836 bytes
x86_64: -938 bytes

Note that for the MIPS architecture only an exception had to be made
disabling the 'simple' calls for 'udhcp' (in networking/udhcp/common.h)
because it made these files larger on MIPS.

Signed-off-by: James Byrne <james.byrne@origamienergy.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-07-02 11:35:03 +02:00

1944 lines
60 KiB
C

/* vi: set sw=4 ts=4: */
/*
* mini dpkg implementation for busybox.
* this is not meant as a replacement for dpkg
*
* written by glenn mcgrath with the help of others
* copyright (c) 2001 by glenn mcgrath
*
* parts of the version comparison code is plucked from the real dpkg
* application which is licensed GPLv2 and
* copyright (c) 1995 Ian Jackson <ian@chiark.greenend.org.uk>
*
* started life as a busybox implementation of udpkg
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
/*
* known difference between busybox dpkg and the official dpkg that i don't
* consider important, its worth keeping a note of differences anyway, just to
* make it easier to maintain.
* - the first value for the confflile: field isn't placed on a new line.
* - when installing a package the status: field is placed at the end of the
* section, rather than just after the package: field.
*
* bugs that need to be fixed
* - (unknown, please let me know when you find any)
*/
//config:config DPKG
//config: bool "dpkg (43 kb)"
//config: default y
//config: select FEATURE_SEAMLESS_GZ
//config: help
//config: dpkg is a medium-level tool to install, build, remove and manage
//config: Debian packages.
//config:
//config: This implementation of dpkg has a number of limitations,
//config: you should use the official dpkg if possible.
//applet:IF_DPKG(APPLET(dpkg, BB_DIR_USR_BIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_DPKG) += dpkg.o
//usage:#define dpkg_trivial_usage
//usage: "[-ilCPru] [-F OPT] PACKAGE"
//usage:#define dpkg_full_usage "\n\n"
//usage: "Install, remove and manage Debian packages\n"
//usage: IF_LONG_OPTS(
//usage: "\n -i,--install Install the package"
//usage: "\n -l,--list List of installed packages"
//usage: "\n --configure Configure an unpackaged package"
//usage: "\n -P,--purge Purge all files of a package"
//usage: "\n -r,--remove Remove all but the configuration files for a package"
//usage: "\n --unpack Unpack a package, but don't configure it"
//usage: "\n --force-depends Ignore dependency problems"
//usage: "\n --force-confnew Overwrite existing config files when installing"
//usage: "\n --force-confold Keep old config files when installing"
//usage: )
//usage: IF_NOT_LONG_OPTS(
//usage: "\n -i Install the package"
//usage: "\n -l List of installed packages"
//usage: "\n -C Configure an unpackaged package"
//usage: "\n -P Purge all files of a package"
//usage: "\n -r Remove all but the configuration files for a package"
//usage: "\n -u Unpack a package, but don't configure it"
//usage: "\n -F depends Ignore dependency problems"
//usage: "\n -F confnew Overwrite existing config files when installing"
//usage: "\n -F confold Keep old config files when installing"
//usage: )
#include "libbb.h"
#include <fnmatch.h>
#include "bb_archive.h"
/* note: if you vary hash_prime sizes be aware,
* 1) tweaking these will have a big effect on how much memory this program uses.
* 2) for computational efficiency these hash tables should be at least 20%
* larger than the maximum number of elements stored in it.
* 3) all _hash_prime's must be a prime number or chaos is assured, if your looking
* for a prime, try http://www.utm.edu/research/primes/lists/small/10000.txt
* 4) if you go bigger than 15 bits you may get into trouble (untested) as its
* sometimes cast to an unsigned, if you go to 16 bit you will overlap
* int's and chaos is assured, 16381 is the max prime for 14 bit field
*/
/* NAME_HASH_PRIME, Stores package names and versions,
* I estimate it should be at least 50% bigger than PACKAGE_HASH_PRIME,
* as there a lot of duplicate version numbers */
#define NAME_HASH_PRIME 16381
/* PACKAGE_HASH_PRIME, Maximum number of unique packages,
* It must not be smaller than STATUS_HASH_PRIME,
* Currently only packages from status_hashtable are stored in here, but in
* future this may be used to store packages not only from a status file,
* but an available_hashtable, and even multiple packages files.
* Package can be stored more than once if they have different versions.
* e.g. The same package may have different versions in the status file
* and available file */
#define PACKAGE_HASH_PRIME 10007
typedef struct edge_s {
unsigned operator:4; /* was:3 */
unsigned type:4;
unsigned name:16; /* was:14 */
unsigned version:16; /* was:14 */
} edge_t;
typedef struct common_node_s {
unsigned name:16; /* was:14 */
unsigned version:16; /* was:14 */
unsigned num_of_edges:16; /* was:14 */
edge_t **edge;
} common_node_t;
/* Currently it doesn't store packages that have state-status of not-installed
* So it only really has to be the size of the maximum number of packages
* likely to be installed at any one time, so there is a bit of leeway here */
#define STATUS_HASH_PRIME 8191
typedef struct status_node_s {
unsigned package:16; /* was:14 */ /* has to fit PACKAGE_HASH_PRIME */
unsigned status:16; /* was:14 */ /* has to fit STATUS_HASH_PRIME */
} status_node_t;
/* Globals */
struct globals {
char *name_hashtable[NAME_HASH_PRIME + 1];
common_node_t *package_hashtable[PACKAGE_HASH_PRIME + 1];
status_node_t *status_hashtable[STATUS_HASH_PRIME + 1];
};
#define G (*ptr_to_globals)
#define name_hashtable (G.name_hashtable )
#define package_hashtable (G.package_hashtable)
#define status_hashtable (G.status_hashtable )
#define INIT_G() do { \
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
} while (0)
/* Even numbers are for 'extras', like ored dependencies or null */
enum edge_type_e {
EDGE_NULL = 0,
EDGE_PRE_DEPENDS = 1,
EDGE_OR_PRE_DEPENDS = 2,
EDGE_DEPENDS = 3,
EDGE_OR_DEPENDS = 4,
EDGE_REPLACES = 5,
EDGE_PROVIDES = 7,
EDGE_CONFLICTS = 9,
EDGE_SUGGESTS = 11,
EDGE_RECOMMENDS = 13,
EDGE_ENHANCES = 15
};
enum operator_e {
VER_NULL = 0,
VER_EQUAL = 1,
VER_LESS = 2,
VER_LESS_EQUAL = 3,
VER_MORE = 4,
VER_MORE_EQUAL = 5,
VER_ANY = 6
};
typedef struct deb_file_s {
char *control_file;
char *filename;
unsigned package:16; /* was:14 */
} deb_file_t;
static void make_hash(const char *key, unsigned *start, unsigned *decrement, const int hash_prime)
{
unsigned long hash_num = key[0];
int len = strlen(key);
int i;
/* Maybe i should have uses a "proper" hashing algorithm here instead
* of making one up myself, seems to be working ok though. */
for (i = 1; i < len; i++) {
/* shifts the ascii based value and adds it to previous value
* shift amount is mod 24 because long int is 32 bit and data
* to be shifted is 8, don't want to shift data to where it has
* no effect */
hash_num += (key[i] + key[i-1]) << ((key[i] * i) % 24);
}
*start = (unsigned) hash_num % hash_prime;
*decrement = (unsigned) 1 + (hash_num % (hash_prime - 1));
}
/* this adds the key to the hash table */
static int search_name_hashtable(const char *key)
{
unsigned probe_address;
unsigned probe_decrement;
make_hash(key, &probe_address, &probe_decrement, NAME_HASH_PRIME);
while (name_hashtable[probe_address] != NULL) {
if (strcmp(name_hashtable[probe_address], key) == 0) {
return probe_address;
}
probe_address -= probe_decrement;
if ((int)probe_address < 0) {
probe_address += NAME_HASH_PRIME;
}
}
name_hashtable[probe_address] = xstrdup(key);
return probe_address;
}
/* this DOESN'T add the key to the hashtable
* TODO make it consistent with search_name_hashtable
*/
static unsigned search_status_hashtable(const char *key)
{
unsigned probe_address;
unsigned probe_decrement;
make_hash(key, &probe_address, &probe_decrement, STATUS_HASH_PRIME);
while (status_hashtable[probe_address] != NULL) {
if (strcmp(key, name_hashtable[package_hashtable[status_hashtable[probe_address]->package]->name]) == 0) {
break;
}
probe_address -= probe_decrement;
if ((int)probe_address < 0) {
probe_address += STATUS_HASH_PRIME;
}
}
return probe_address;
}
static int order(char x)
{
return (x == '~' ? -1
: x == '\0' ? 0
: isdigit(x) ? 0
: isalpha(x) ? x
: (unsigned char)x + 256
);
}
/* This code is taken from dpkg and modified slightly to work with busybox */
static int version_compare_part(const char *val, const char *ref)
{
if (!val) val = "";
if (!ref) ref = "";
while (*val || *ref) {
int first_diff;
while ((*val && !isdigit(*val)) || (*ref && !isdigit(*ref))) {
int vc = order(*val);
int rc = order(*ref);
if (vc != rc)
return vc - rc;
val++;
ref++;
}
while (*val == '0')
val++;
while (*ref == '0')
ref++;
first_diff = 0;
while (isdigit(*val) && isdigit(*ref)) {
if (first_diff == 0)
first_diff = *val - *ref;
val++;
ref++;
}
if (isdigit(*val))
return 1;
if (isdigit(*ref))
return -1;
if (first_diff)
return first_diff;
}
return 0;
}
/* if ver1 < ver2 return -1,
* if ver1 = ver2 return 0,
* if ver1 > ver2 return 1,
*/
static int version_compare(const unsigned ver1, const unsigned ver2)
{
char *ch_ver1 = name_hashtable[ver1];
char *ch_ver2 = name_hashtable[ver2];
unsigned epoch1 = 0, epoch2 = 0;
char *colon;
char *deb_ver1, *deb_ver2;
char *upstream_ver1;
char *upstream_ver2;
int result;
/* Compare epoch */
colon = strchr(ch_ver1, ':');
if (colon) {
epoch1 = atoi(ch_ver1);
ch_ver1 = colon + 1;
}
colon = strchr(ch_ver2, ':');
if (colon) {
epoch2 = atoi(ch_ver2);
ch_ver2 = colon + 1;
}
if (epoch1 < epoch2) {
return -1;
}
if (epoch1 > epoch2) {
return 1;
}
/* Compare upstream version */
upstream_ver1 = xstrdup(ch_ver1);
upstream_ver2 = xstrdup(ch_ver2);
/* Chop off debian version, and store for later use */
deb_ver1 = strrchr(upstream_ver1, '-');
deb_ver2 = strrchr(upstream_ver2, '-');
if (deb_ver1) {
*deb_ver1++ = '\0';
}
if (deb_ver2) {
*deb_ver2++ = '\0';
}
result = version_compare_part(upstream_ver1, upstream_ver2);
if (result == 0) {
/* Compare debian versions */
result = version_compare_part(deb_ver1, deb_ver2);
}
free(upstream_ver1);
free(upstream_ver2);
return result;
}
static int test_version(const unsigned version1, const unsigned version2, const unsigned operator)
{
const int version_result = version_compare(version1, version2);
switch (operator) {
case VER_ANY:
return TRUE;
case VER_EQUAL:
return (version_result == 0);
case VER_LESS:
return (version_result < 0);
case VER_LESS_EQUAL:
return (version_result <= 0);
case VER_MORE:
return (version_result > 0);
case VER_MORE_EQUAL:
return (version_result >= 0);
}
return FALSE;
}
static int search_package_hashtable(const unsigned name, const unsigned version, const unsigned operator)
{
unsigned probe_address;
unsigned probe_decrement;
make_hash(name_hashtable[name], &probe_address, &probe_decrement, PACKAGE_HASH_PRIME);
while (package_hashtable[probe_address] != NULL) {
if (package_hashtable[probe_address]->name == name) {
if (operator == VER_ANY) {
return probe_address;
}
if (test_version(package_hashtable[probe_address]->version, version, operator)) {
return probe_address;
}
}
probe_address -= probe_decrement;
if ((int)probe_address < 0) {
probe_address += PACKAGE_HASH_PRIME;
}
}
return probe_address;
}
/*
* This function searches through the entire package_hashtable looking
* for a package which provides "needle". It returns the index into
* the package_hashtable for the providing package.
*
* needle is the index into name_hashtable of the package we are
* looking for.
*
* start_at is the index in the package_hashtable to start looking
* at. If start_at is -1 then start at the beginning. This is to allow
* for repeated searches since more than one package might provide
* needle.
*
* FIXME: I don't think this is very efficient, but I thought I'd keep
* it simple for now until it proves to be a problem.
*/
static int search_for_provides(int needle, int start_at)
{
int i, j;
common_node_t *p;
for (i = start_at + 1; i < PACKAGE_HASH_PRIME; i++) {
p = package_hashtable[i];
if (p == NULL)
continue;
for (j = 0; j < p->num_of_edges; j++)
if (p->edge[j]->type == EDGE_PROVIDES && p->edge[j]->name == needle)
return i;
}
return -1;
}
/*
* Add an edge to a node
*/
static void add_edge_to_node(common_node_t *node, edge_t *edge)
{
node->edge = xrealloc_vector(node->edge, 2, node->num_of_edges);
node->edge[node->num_of_edges++] = edge;
}
/*
* Create one new node and one new edge for every dependency.
*
* Dependencies which contain multiple alternatives are represented as
* an EDGE_OR_PRE_DEPENDS or EDGE_OR_DEPENDS node, followed by a
* number of EDGE_PRE_DEPENDS or EDGE_DEPENDS nodes. The name field of
* the OR edge contains the full dependency string while the version
* field contains the number of EDGE nodes which follow as part of
* this alternative.
*/
static void add_split_dependencies(common_node_t *parent_node, const char *whole_line, unsigned edge_type)
{
char *line = xstrdup(whole_line);
char *line2;
char *line_ptr1 = NULL;
char *line_ptr2 = NULL;
char *field;
char *field2;
char *version;
edge_t *edge;
edge_t *or_edge;
int offset_ch;
field = strtok_r(line, ",", &line_ptr1);
do {
/* skip leading spaces */
field += strspn(field, " ");
line2 = xstrdup(field);
field2 = strtok_r(line2, "|", &line_ptr2);
or_edge = NULL;
if ((edge_type == EDGE_DEPENDS || edge_type == EDGE_PRE_DEPENDS)
&& (strcmp(field, field2) != 0)
) {
or_edge = xzalloc(sizeof(edge_t));
or_edge->type = edge_type + 1;
or_edge->name = search_name_hashtable(field);
//or_edge->version = 0; // tracks the number of alternatives
add_edge_to_node(parent_node, or_edge);
}
do {
edge = xmalloc(sizeof(edge_t));
edge->type = edge_type;
/* Skip any extra leading spaces */
field2 += strspn(field2, " ");
/* Get dependency version info */
version = strchr(field2, '(');
if (version == NULL) {
edge->operator = VER_ANY;
/* Get the versions hash number, adding it if the number isn't already in there */
edge->version = search_name_hashtable("ANY");
} else {
/* Skip leading ' ' or '(' */
version += strspn(version, " (");
/* Calculate length of any operator characters */
offset_ch = strspn(version, "<=>");
/* Determine operator */
if (offset_ch > 0) {
if (strncmp(version, "=", offset_ch) == 0) {
edge->operator = VER_EQUAL;
} else if (strncmp(version, "<<", offset_ch) == 0) {
edge->operator = VER_LESS;
} else if (strncmp(version, "<=", offset_ch) == 0) {
edge->operator = VER_LESS_EQUAL;
} else if (strncmp(version, ">>", offset_ch) == 0) {
edge->operator = VER_MORE;
} else if (strncmp(version, ">=", offset_ch) == 0) {
edge->operator = VER_MORE_EQUAL;
} else {
bb_simple_error_msg_and_die("illegal operator");
}
}
/* skip to start of version numbers */
version += offset_ch;
version += strspn(version, " ");
/* Truncate version at trailing ' ' or ')' */
version[strcspn(version, " )")] = '\0';
/* Get the versions hash number, adding it if the number isn't already in there */
edge->version = search_name_hashtable(version);
}
/* Get the dependency name */
field2[strcspn(field2, " (")] = '\0';
edge->name = search_name_hashtable(field2);
if (or_edge)
or_edge->version++;
add_edge_to_node(parent_node, edge);
field2 = strtok_r(NULL, "|", &line_ptr2);
} while (field2 != NULL);
free(line2);
field = strtok_r(NULL, ",", &line_ptr1);
} while (field != NULL);
free(line);
}
static void free_package(common_node_t *node)
{
unsigned i;
if (node) {
for (i = 0; i < node->num_of_edges; i++) {
free(node->edge[i]);
}
free(node->edge);
free(node);
}
}
/*
* Gets the next package field from package_buffer, separated into the field name
* and field value, it returns the int offset to the first character of the next field
*/
static int read_package_field(const char *package_buffer, char **field_name, char **field_value)
{
int offset_name_start = 0;
int offset_name_end = 0;
int offset_value_start = 0;
int offset_value_end = 0;
int offset = 0;
int next_offset;
int name_length;
int value_length;
int exit_flag = FALSE;
if (package_buffer == NULL) {
*field_name = NULL;
*field_value = NULL;
return -1;
}
while (1) {
next_offset = offset + 1;
switch (package_buffer[offset]) {
case '\0':
exit_flag = TRUE;
break;
case ':':
if (offset_name_end == 0) {
offset_name_end = offset;
offset_value_start = next_offset;
}
/* TODO: Name might still have trailing spaces if ':' isn't
* immediately after name */
break;
case '\n':
/* TODO: The char next_offset may be out of bounds */
if (package_buffer[next_offset] != ' ') {
exit_flag = TRUE;
break;
}
case '\t':
case ' ':
/* increment the value start point if its a just filler */
if (offset_name_start == offset) {
offset_name_start++;
}
if (offset_value_start == offset) {
offset_value_start++;
}
break;
}
if (exit_flag) {
/* Check that the names are valid */
offset_value_end = offset;
name_length = offset_name_end - offset_name_start;
value_length = offset_value_end - offset_value_start;
if (name_length == 0) {
break;
}
if ((name_length > 0) && (value_length > 0)) {
break;
}
/* If not valid, start fresh with next field */
exit_flag = FALSE;
offset_name_start = offset + 1;
offset_name_end = 0;
offset_value_start = offset + 1;
offset_value_end = offset + 1;
offset++;
}
offset++;
}
*field_name = NULL;
if (name_length) {
*field_name = xstrndup(&package_buffer[offset_name_start], name_length);
}
*field_value = NULL;
if (value_length > 0) {
*field_value = xstrndup(&package_buffer[offset_value_start], value_length);
}
return next_offset;
}
static unsigned fill_package_struct(char *control_buffer)
{
static const char field_names[] ALIGN1 =
"Package\0""Version\0"
"Pre-Depends\0""Depends\0""Replaces\0""Provides\0"
"Conflicts\0""Suggests\0""Recommends\0""Enhances\0";
common_node_t *new_node = xzalloc(sizeof(common_node_t));
char *field_name;
char *field_value;
int field_start = 0;
int num = -1;
int buffer_length = strlen(control_buffer);
new_node->version = search_name_hashtable("unknown");
while (field_start < buffer_length) {
unsigned field_num;
field_start += read_package_field(&control_buffer[field_start],
&field_name, &field_value);
if (field_name == NULL) {
goto fill_package_struct_cleanup;
}
field_num = index_in_strings(field_names, field_name);
switch (field_num) {
case 0: /* Package */
new_node->name = search_name_hashtable(field_value);
break;
case 1: /* Version */
new_node->version = search_name_hashtable(field_value);
break;
case 2: /* Pre-Depends */
add_split_dependencies(new_node, field_value, EDGE_PRE_DEPENDS);
break;
case 3: /* Depends */
add_split_dependencies(new_node, field_value, EDGE_DEPENDS);
break;
case 4: /* Replaces */
add_split_dependencies(new_node, field_value, EDGE_REPLACES);
break;
case 5: /* Provides */
add_split_dependencies(new_node, field_value, EDGE_PROVIDES);
break;
case 6: /* Conflicts */
add_split_dependencies(new_node, field_value, EDGE_CONFLICTS);
break;
case 7: /* Suggests */
add_split_dependencies(new_node, field_value, EDGE_SUGGESTS);
break;
case 8: /* Recommends */
add_split_dependencies(new_node, field_value, EDGE_RECOMMENDS);
break;
case 9: /* Enhances */
add_split_dependencies(new_node, field_value, EDGE_ENHANCES);
break;
}
fill_package_struct_cleanup:
free(field_name);
free(field_value);
}
if (new_node->version == search_name_hashtable("unknown")) {
free_package(new_node);
return -1;
}
num = search_package_hashtable(new_node->name, new_node->version, VER_EQUAL);
free_package(package_hashtable[num]);
package_hashtable[num] = new_node;
return num;
}
/* if num = 1, it returns the want status, 2 returns flag, 3 returns status */
static unsigned get_status(const unsigned status_node, const int num)
{
char *status_string = name_hashtable[status_hashtable[status_node]->status];
char *state_sub_string;
unsigned state_sub_num;
int len;
int i;
/* set tmp_string to point to the start of the word number */
for (i = 1; i < num; i++) {
/* skip past a word */
status_string += strcspn(status_string, " ");
/* skip past the separating spaces */
status_string += strspn(status_string, " ");
}
len = strcspn(status_string, " \n");
state_sub_string = xstrndup(status_string, len);
state_sub_num = search_name_hashtable(state_sub_string);
free(state_sub_string);
return state_sub_num;
}
static void set_status(const unsigned status_node_num, const char *new_value, const int position)
{
const unsigned new_value_num = search_name_hashtable(new_value);
unsigned want = get_status(status_node_num, 1);
unsigned flag = get_status(status_node_num, 2);
unsigned status = get_status(status_node_num, 3);
char *new_status;
switch (position) {
case 1:
want = new_value_num;
break;
case 2:
flag = new_value_num;
break;
case 3:
status = new_value_num;
break;
default:
bb_simple_error_msg_and_die("DEBUG ONLY: this shouldnt happen");
}
new_status = xasprintf("%s %s %s", name_hashtable[want], name_hashtable[flag], name_hashtable[status]);
status_hashtable[status_node_num]->status = search_name_hashtable(new_status);
free(new_status);
}
static const char *describe_status(int status_num)
{
int status_want, status_state;
if (status_hashtable[status_num] == NULL || status_hashtable[status_num]->status == 0)
return "is not installed or flagged to be installed";
status_want = get_status(status_num, 1);
status_state = get_status(status_num, 3);
if (status_state == search_name_hashtable("installed")) {
if (status_want == search_name_hashtable("install"))
return "is installed";
if (status_want == search_name_hashtable("deinstall"))
return "is marked to be removed";
if (status_want == search_name_hashtable("purge"))
return "is marked to be purged";
}
if (status_want == search_name_hashtable("unknown"))
return "is in an indeterminate state";
if (status_want == search_name_hashtable("install"))
return "is marked to be installed";
return "is not installed or flagged to be installed";
}
static void index_status_file(const char *filename)
{
FILE *status_file;
char *control_buffer;
char *status_line;
status_node_t *status_node = NULL;
unsigned status_num;
status_file = xfopen_for_read(filename);
while ((control_buffer = xmalloc_fgetline_str(status_file, "\n\n")) != NULL) {
const unsigned package_num = fill_package_struct(control_buffer);
if (package_num != -1) {
status_node = xmalloc(sizeof(status_node_t));
/* fill_package_struct doesn't handle the status field */
status_line = strstr(control_buffer, "Status:");
if (status_line != NULL) {
status_line += 7;
status_line += strspn(status_line, " \n\t");
status_line = xstrndup(status_line, strcspn(status_line, "\n"));
status_node->status = search_name_hashtable(status_line);
free(status_line);
}
status_node->package = package_num;
status_num = search_status_hashtable(name_hashtable[package_hashtable[status_node->package]->name]);
status_hashtable[status_num] = status_node;
}
free(control_buffer);
}
fclose(status_file);
}
static void write_buffer_no_status(FILE *new_status_file, const char *control_buffer)
{
char *name;
char *value;
int start = 0;
while (1) {
start += read_package_field(&control_buffer[start], &name, &value);
if (name == NULL) {
break;
}
if (strcmp(name, "Status") != 0) {
fprintf(new_status_file, "%s: %s\n", name, value);
}
}
}
/* This could do with a cleanup */
static void write_status_file(deb_file_t **deb_file)
{
FILE *old_status_file = xfopen_for_read("/var/lib/dpkg/status");
FILE *new_status_file = xfopen_for_write("/var/lib/dpkg/status.udeb");
char *package_name;
char *status_from_file;
char *control_buffer = NULL;
char *tmp_string;
int status_num;
int field_start = 0;
int write_flag;
int i = 0;
/* Update previously known packages */
while ((control_buffer = xmalloc_fgetline_str(old_status_file, "\n\n")) != NULL) {
tmp_string = strstr(control_buffer, "Package:");
if (tmp_string == NULL) {
continue;
}
tmp_string += 8;
tmp_string += strspn(tmp_string, " \n\t");
package_name = xstrndup(tmp_string, strcspn(tmp_string, "\n"));
write_flag = FALSE;
tmp_string = strstr(control_buffer, "Status:");
if (tmp_string != NULL) {
/* Separate the status value from the control buffer */
tmp_string += 7;
tmp_string += strspn(tmp_string, " \n\t");
status_from_file = xstrndup(tmp_string, strcspn(tmp_string, "\n"));
} else {
status_from_file = NULL;
}
/* Find this package in the status hashtable */
status_num = search_status_hashtable(package_name);
if (status_hashtable[status_num] != NULL) {
const char *status_from_hashtable = name_hashtable[status_hashtable[status_num]->status];
if (strcmp(status_from_file, status_from_hashtable) != 0) {
/* New status isn't exactly the same as old status */
const int state_status = get_status(status_num, 3);
if ((strcmp("installed", name_hashtable[state_status]) == 0)
|| (strcmp("unpacked", name_hashtable[state_status]) == 0)
) {
/* We need to add the control file from the package */
i = 0;
while (deb_file[i] != NULL) {
if (strcmp(package_name, name_hashtable[package_hashtable[deb_file[i]->package]->name]) == 0) {
/* Write a status file entry with a modified status */
/* remove trailing \n's */
write_buffer_no_status(new_status_file, deb_file[i]->control_file);
set_status(status_num, "ok", 2);
fprintf(new_status_file, "Status: %s\n\n",
name_hashtable[status_hashtable[status_num]->status]);
write_flag = TRUE;
break;
}
i++;
}
/* This is temperary, debugging only */
if (deb_file[i] == NULL) {
bb_error_msg_and_die("ALERT: cannot find a control file, "
"your status file may be broken, status may be "
"incorrect for %s", package_name);
}
}
else if (strcmp("not-installed", name_hashtable[state_status]) == 0) {
/* Only write the Package, Status, Priority and Section lines */
fprintf(new_status_file, "Package: %s\n", package_name);
fprintf(new_status_file, "Status: %s\n", status_from_hashtable);
while (1) {
char *field_name;
char *field_value;
field_start += read_package_field(&control_buffer[field_start], &field_name, &field_value);
if (field_name == NULL) {
break;
}
if ((strcmp(field_name, "Priority") == 0)
|| (strcmp(field_name, "Section") == 0)
) {
fprintf(new_status_file, "%s: %s\n", field_name, field_value);
}
}
write_flag = TRUE;
fputs("\n", new_status_file);
}
else if (strcmp("config-files", name_hashtable[state_status]) == 0) {
/* only change the status line */
while (1) {
char *field_name;
char *field_value;
field_start += read_package_field(&control_buffer[field_start], &field_name, &field_value);
if (field_name == NULL) {
break;
}
/* Setup start point for next field */
if (strcmp(field_name, "Status") == 0) {
fprintf(new_status_file, "Status: %s\n", status_from_hashtable);
} else {
fprintf(new_status_file, "%s: %s\n", field_name, field_value);
}
}
write_flag = TRUE;
fputs("\n", new_status_file);
}
}
}
/* If the package from the status file wasn't handle above, do it now*/
if (!write_flag) {
fprintf(new_status_file, "%s\n\n", control_buffer);
}
free(status_from_file);
free(package_name);
free(control_buffer);
}
/* Write any new packages */
for (i = 0; deb_file[i] != NULL; i++) {
status_num = search_status_hashtable(name_hashtable[package_hashtable[deb_file[i]->package]->name]);
if (strcmp("reinstreq", name_hashtable[get_status(status_num, 2)]) == 0) {
write_buffer_no_status(new_status_file, deb_file[i]->control_file);
set_status(status_num, "ok", 2);
fprintf(new_status_file, "Status: %s\n\n", name_hashtable[status_hashtable[status_num]->status]);
}
}
fclose(old_status_file);
fclose(new_status_file);
/* Create a separate backfile to dpkg */
if (rename("/var/lib/dpkg/status", "/var/lib/dpkg/status.udeb.bak") == -1) {
if (errno != ENOENT)
bb_simple_error_msg_and_die("can't create backup status file");
/* Its ok if renaming the status file fails because status
* file doesn't exist, maybe we are starting from scratch */
bb_simple_error_msg("no status file found, creating new one");
}
xrename("/var/lib/dpkg/status.udeb", "/var/lib/dpkg/status");
}
/* This function returns TRUE if the given package can satisfy a
* dependency of type depend_type.
*
* A pre-depends is satisfied only if a package is already installed,
* which a regular depends can be satisfied by a package which we want
* to install.
*/
static int package_satisfies_dependency(int package, int depend_type)
{
int status_num = search_status_hashtable(name_hashtable[package_hashtable[package]->name]);
/* status could be unknown if package is a pure virtual
* provides which cannot satisfy any dependency by itself.
*/
if (status_hashtable[status_num] == NULL)
return 0;
switch (depend_type) {
case EDGE_PRE_DEPENDS: return get_status(status_num, 3) == search_name_hashtable("installed");
case EDGE_DEPENDS: return get_status(status_num, 1) == search_name_hashtable("install");
}
return 0;
}
static int check_deps(deb_file_t **deb_file, int deb_start /*, int dep_max_count - ?? */)
{
int *conflicts = NULL;
int conflicts_num = 0;
int i = deb_start;
int j;
/* Check for conflicts
* TODO: TEST if conflicts with other packages to be installed
*
* Add install packages and the packages they provide
* to the list of files to check conflicts for
*/
/* Create array of package numbers to check against
* installed package for conflicts*/
while (deb_file[i] != NULL) {
const unsigned package_num = deb_file[i]->package;
conflicts = xrealloc_vector(conflicts, 2, conflicts_num);
conflicts[conflicts_num] = package_num;
conflicts_num++;
/* add provides to conflicts list */
for (j = 0; j < package_hashtable[package_num]->num_of_edges; j++) {
if (package_hashtable[package_num]->edge[j]->type == EDGE_PROVIDES) {
const int conflicts_package_num = search_package_hashtable(
package_hashtable[package_num]->edge[j]->name,
package_hashtable[package_num]->edge[j]->version,
package_hashtable[package_num]->edge[j]->operator);
if (package_hashtable[conflicts_package_num] == NULL) {
/* create a new package */
common_node_t *new_node = xzalloc(sizeof(common_node_t));
new_node->name = package_hashtable[package_num]->edge[j]->name;
new_node->version = package_hashtable[package_num]->edge[j]->version;
package_hashtable[conflicts_package_num] = new_node;
}
conflicts = xrealloc_vector(conflicts, 2, conflicts_num);
conflicts[conflicts_num] = conflicts_package_num;
conflicts_num++;
}
}
i++;
}
/* Check conflicts */
i = 0;
while (deb_file[i] != NULL) {
const common_node_t *package_node = package_hashtable[deb_file[i]->package];
int status_num = 0;
status_num = search_status_hashtable(name_hashtable[package_node->name]);
if (get_status(status_num, 3) == search_name_hashtable("installed")) {
i++;
continue;
}
for (j = 0; j < package_node->num_of_edges; j++) {
const edge_t *package_edge = package_node->edge[j];
if (package_edge->type == EDGE_CONFLICTS) {
const unsigned package_num =
search_package_hashtable(package_edge->name,
package_edge->version,
package_edge->operator);
int result = 0;
if (package_hashtable[package_num] != NULL) {
status_num = search_status_hashtable(name_hashtable[package_hashtable[package_num]->name]);
if (get_status(status_num, 1) == search_name_hashtable("install")) {
result = test_version(package_hashtable[deb_file[i]->package]->version,
package_edge->version, package_edge->operator);
}
}
if (result) {
bb_error_msg_and_die("package %s conflicts with %s",
name_hashtable[package_node->name],
name_hashtable[package_edge->name]);
}
}
}
i++;
}
/* Check dependentcies */
for (i = 0; i < PACKAGE_HASH_PRIME; i++) {
int status_num = 0;
int number_of_alternatives = 0;
const edge_t * root_of_alternatives = NULL;
const common_node_t *package_node = package_hashtable[i];
/* If the package node does not exist then this
* package is a virtual one. In which case there are
* no dependencies to check.
*/
if (package_node == NULL) continue;
status_num = search_status_hashtable(name_hashtable[package_node->name]);
/* If there is no status then this package is a
* virtual one provided by something else. In which
* case there are no dependencies to check.
*/
if (status_hashtable[status_num] == NULL) continue;
/* If we don't want this package installed then we may
* as well ignore it's dependencies.
*/
if (get_status(status_num, 1) != search_name_hashtable("install")) {
continue;
}
/* This code is tested only for EDGE_DEPENDS, since I
* have no suitable pre-depends available. There is no
* reason that it shouldn't work though :-)
*/
for (j = 0; j < package_node->num_of_edges; j++) {
const edge_t *package_edge = package_node->edge[j];
unsigned package_num;
if (package_edge->type == EDGE_OR_PRE_DEPENDS
|| package_edge->type == EDGE_OR_DEPENDS
) {
/* start an EDGE_OR_ list */
number_of_alternatives = package_edge->version;
root_of_alternatives = package_edge;
continue;
}
if (number_of_alternatives == 0) { /* not in the middle of an EDGE_OR_ list */
number_of_alternatives = 1;
root_of_alternatives = NULL;
}
package_num = search_package_hashtable(package_edge->name, package_edge->version, package_edge->operator);
if (package_edge->type == EDGE_PRE_DEPENDS
|| package_edge->type == EDGE_DEPENDS
) {
int result=1;
status_num = 0;
/* If we are inside an alternative then check
* this edge is the right type.
*
* EDGE_DEPENDS == OR_DEPENDS -1
* EDGE_PRE_DEPENDS == OR_PRE_DEPENDS -1
*/
if (root_of_alternatives && package_edge->type != root_of_alternatives->type - 1)
bb_error_msg_and_die("fatal error, package dependencies corrupt: %d != %d - 1",
package_edge->type, root_of_alternatives->type);
if (package_hashtable[package_num] != NULL)
result = !package_satisfies_dependency(package_num, package_edge->type);
if (result) { /* check for other package which provide what we are looking for */
int provider = -1;
while ((provider = search_for_provides(package_edge->name, provider)) > -1) {
if (package_hashtable[provider] == NULL) {
puts("Have a provider but no package information for it");
continue;
}
result = !package_satisfies_dependency(provider, package_edge->type);
if (result == 0)
break;
}
}
/* It must be already installed, or to be installed */
number_of_alternatives--;
if (result && number_of_alternatives == 0) {
if (root_of_alternatives)
bb_error_msg_and_die(
"package %s %sdepends on %s, which %s",
name_hashtable[package_node->name],
package_edge->type == EDGE_PRE_DEPENDS ? "pre-" : "",
name_hashtable[root_of_alternatives->name],
"cannot be satisfied");
bb_error_msg_and_die(
"package %s %sdepends on %s, which %s",
name_hashtable[package_node->name],
package_edge->type == EDGE_PRE_DEPENDS ? "pre-" : "",
name_hashtable[package_edge->name],
describe_status(status_num));
}
if (result == 0 && number_of_alternatives) {
/* we've found a package which
* satisfies the dependency,
* so skip over the rest of
* the alternatives.
*/
j += number_of_alternatives;
number_of_alternatives = 0;
}
}
}
}
free(conflicts);
return TRUE;
}
static char **create_list(const char *filename)
{
FILE *list_stream;
char **file_list;
char *line;
int count;
/* don't use [xw]fopen here, handle error ourself */
list_stream = fopen_for_read(filename);
if (list_stream == NULL) {
return NULL;
}
file_list = NULL;
count = 0;
while ((line = xmalloc_fgetline(list_stream)) != NULL) {
file_list = xrealloc_vector(file_list, 2, count);
file_list[count++] = line;
/*file_list[count] = NULL; - xrealloc_vector did it */
}
fclose(list_stream);
return file_list;
}
/* maybe i should try and hook this into remove_file.c somehow */
static int remove_file_array(char **remove_names, char **exclude_names)
{
struct stat path_stat;
int remove_flag = 1; /* not removed anything yet */
int i, j;
if (remove_names == NULL) {
return 0;
}
for (i = 0; remove_names[i] != NULL; i++) {
if (exclude_names != NULL) {
for (j = 0; exclude_names[j] != NULL; j++) {
if (strcmp(remove_names[i], exclude_names[j]) == 0) {
goto skip;
}
}
}
/* TODO: why we are checking lstat? we can just try rm/rmdir */
if (lstat(remove_names[i], &path_stat) < 0) {
continue;
}
if (S_ISDIR(path_stat.st_mode)) {
remove_flag &= rmdir(remove_names[i]); /* 0 if no error */
} else {
remove_flag &= unlink(remove_names[i]); /* 0 if no error */
}
skip:
continue;
}
return (remove_flag == 0);
}
static void run_package_script_or_die(const char *package_name, const char *script_type)
{
char *script_path;
int result;
script_path = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, script_type);
/* If the file doesn't exist it isn't fatal */
result = access(script_path, F_OK) ? EXIT_SUCCESS : system(script_path);
free(script_path);
if (result)
bb_error_msg_and_die("%s failed, exit code %d", script_type, result);
}
/*
The policy manual defines what scripts get called when and with
what arguments. I realize that busybox does not support all of
these scenarios, but it does support some of them; it does not,
however, run them with any parameters in run_package_script_or_die().
Here are the scripts:
preinst install
preinst install <old_version>
preinst upgrade <old_version>
preinst abort_upgrade <new_version>
postinst configure <most_recent_version>
postinst abort-upgade <new_version>
postinst abort-remove
postinst abort-remove in-favour <package> <version>
postinst abort-deconfigure in-favor <failed_install_package> removing <conflicting_package> <version>
prerm remove
prerm upgrade <new_version>
prerm failed-upgrade <old_version>
prerm remove in-favor <package> <new_version>
prerm deconfigure in-favour <package> <version> removing <package> <version>
postrm remove
postrm purge
postrm upgrade <new_version>
postrm failed-upgrade <old_version>
postrm abort-install
postrm abort-install <old_version>
postrm abort-upgrade <old_version>
postrm disappear <overwriter> <version>
*/
static const char *const all_control_files[] = {
"preinst", "postinst", "prerm", "postrm",
"list", "md5sums", "shlibs", "conffiles",
"config", "templates"
};
static char **all_control_list(const char *package_name)
{
unsigned i = 0;
char **remove_files;
/* Create a list of all /var/lib/dpkg/info/<package> files */
remove_files = xzalloc(sizeof(all_control_files) + sizeof(char*));
while (i < ARRAY_SIZE(all_control_files)) {
remove_files[i] = xasprintf("/var/lib/dpkg/info/%s.%s",
package_name, all_control_files[i]);
i++;
}
return remove_files;
}
static void free_array(char **array)
{
if (array) {
unsigned i = 0;
while (array[i]) {
free(array[i]);
i++;
}
free(array);
}
}
/* This function lists information on the installed packages. It loops through
* the status_hashtable to retrieve the info. This results in smaller code than
* scanning the status file. The resulting list, however, is unsorted.
*/
static void list_packages(const char *pattern)
{
int i;
puts(" Name Version");
puts("+++-==============-==============");
/* go through status hash, dereference package hash and finally strings */
for (i = 0; i < STATUS_HASH_PRIME+1; i++) {
if (status_hashtable[i]) {
const char *stat_str; /* status string */
const char *name_str; /* package name */
const char *vers_str; /* version */
char s1, s2; /* status abbreviations */
int spccnt; /* space count */
int j;
stat_str = name_hashtable[status_hashtable[i]->status];
name_str = name_hashtable[package_hashtable[status_hashtable[i]->package]->name];
vers_str = name_hashtable[package_hashtable[status_hashtable[i]->package]->version];
if (pattern && fnmatch(pattern, name_str, 0) != 0)
continue;
/* get abbreviation for status field 1 */
s1 = stat_str[0] == 'i' ? 'i' : 'r';
/* get abbreviation for status field 2 */
for (j = 0, spccnt = 0; stat_str[j] && spccnt < 2; j++) {
if (stat_str[j] == ' ') spccnt++;
}
s2 = stat_str[j];
/* print out the line formatted like Debian dpkg */
printf("%c%c %-14s %s\n", s1, s2, name_str, vers_str);
}
}
}
static void remove_package(const unsigned package_num, int noisy)
{
const char *package_name = name_hashtable[package_hashtable[package_num]->name];
const char *package_version = name_hashtable[package_hashtable[package_num]->version];
const unsigned status_num = search_status_hashtable(package_name);
const int package_name_length = strlen(package_name);
char **remove_files;
char **exclude_files;
char list_name[package_name_length + 25];
char conffile_name[package_name_length + 30];
if (noisy)
printf("Removing %s (%s)...\n", package_name, package_version);
/* Run prerm script */
run_package_script_or_die(package_name, "prerm");
/* Create a list of files to remove, and a separate list of those to keep */
sprintf(list_name, "/var/lib/dpkg/info/%s.%s", package_name, "list");
remove_files = create_list(list_name);
sprintf(conffile_name, "/var/lib/dpkg/info/%s.%s", package_name, "conffiles");
exclude_files = create_list(conffile_name);
/* Some directories can't be removed straight away, so do multiple passes */
while (remove_file_array(remove_files, exclude_files))
continue;
free_array(exclude_files);
free_array(remove_files);
/* Create a list of files in /var/lib/dpkg/info/<package>.* to keep */
exclude_files = xzalloc(sizeof(exclude_files[0]) * 3);
exclude_files[0] = xstrdup(conffile_name);
exclude_files[1] = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "postrm");
/* Create a list of all /var/lib/dpkg/info/<package> files */
remove_files = all_control_list(package_name);
remove_file_array(remove_files, exclude_files);
free_array(remove_files);
free_array(exclude_files);
/* rename <package>.conffiles to <package>.list
* The conffiles control file isn't required in Debian packages, so don't
* error out if it's missing. */
rename(conffile_name, list_name);
/* Change package status */
set_status(status_num, "config-files", 3);
}
static void purge_package(const unsigned package_num)
{
const char *package_name = name_hashtable[package_hashtable[package_num]->name];
const char *package_version = name_hashtable[package_hashtable[package_num]->version];
const unsigned status_num = search_status_hashtable(package_name);
char **remove_files;
char **exclude_files;
char list_name[strlen(package_name) + 25];
printf("Purging %s (%s)...\n", package_name, package_version);
/* Run prerm script */
run_package_script_or_die(package_name, "prerm");
/* Create a list of files to remove */
sprintf(list_name, "/var/lib/dpkg/info/%s.%s", package_name, "list");
remove_files = create_list(list_name);
/* Some directories cant be removed straight away, so do multiple passes */
while (remove_file_array(remove_files, NULL))
continue;
free_array(remove_files);
/* Create a list of all /var/lib/dpkg/info/<package> files */
remove_files = all_control_list(package_name);
/* Delete all of them except the postrm script */
exclude_files = xzalloc(sizeof(exclude_files[0]) * 2);
exclude_files[0] = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "postrm");
remove_file_array(remove_files, exclude_files);
free_array(exclude_files);
/* Run and remove postrm script */
run_package_script_or_die(package_name, "postrm");
remove_file_array(remove_files, NULL);
free_array(remove_files);
/* Change package status */
set_status(status_num, "not-installed", 3);
}
static archive_handle_t *init_archive_deb_ar(const char *filename)
{
archive_handle_t *ar_handle;
/* Setup an ar archive handle that refers to the gzip sub archive */
ar_handle = init_handle();
ar_handle->filter = filter_accept_list_reassign;
ar_handle->src_fd = xopen(filename, O_RDONLY);
return ar_handle;
}
static void init_archive_deb_control(archive_handle_t *ar_handle)
{
archive_handle_t *tar_handle;
/* Setup the tar archive handle */
tar_handle = init_handle();
tar_handle->src_fd = ar_handle->src_fd;
/* We don't care about data.tar.* or debian-binary, just control.tar.* */
llist_add_to(&(ar_handle->accept), (char*)"control.tar");
#if ENABLE_FEATURE_SEAMLESS_GZ
llist_add_to(&(ar_handle->accept), (char*)"control.tar.gz");
#endif
#if ENABLE_FEATURE_SEAMLESS_BZ2
llist_add_to(&(ar_handle->accept), (char*)"control.tar.bz2");
#endif
#if ENABLE_FEATURE_SEAMLESS_XZ
llist_add_to(&(ar_handle->accept), (char*)"control.tar.xz");
#endif
/* Assign the tar handle as a subarchive of the ar handle */
ar_handle->dpkg__sub_archive = tar_handle;
}
static void init_archive_deb_data(archive_handle_t *ar_handle)
{
archive_handle_t *tar_handle;
/* Setup the tar archive handle */
tar_handle = init_handle();
tar_handle->src_fd = ar_handle->src_fd;
/* We don't care about control.tar.* or debian-binary, just data.tar.* */
llist_add_to(&(ar_handle->accept), (char*)"data.tar");
#if ENABLE_FEATURE_SEAMLESS_GZ
llist_add_to(&(ar_handle->accept), (char*)"data.tar.gz");
#endif
#if ENABLE_FEATURE_SEAMLESS_BZ2
llist_add_to(&(ar_handle->accept), (char*)"data.tar.bz2");
#endif
#if ENABLE_FEATURE_SEAMLESS_LZMA
llist_add_to(&(ar_handle->accept), (char*)"data.tar.lzma");
#endif
#if ENABLE_FEATURE_SEAMLESS_XZ
llist_add_to(&(ar_handle->accept), (char*)"data.tar.xz");
#endif
/* Assign the tar handle as a subarchive of the ar handle */
ar_handle->dpkg__sub_archive = tar_handle;
}
static void FAST_FUNC data_extract_to_buffer(archive_handle_t *archive_handle)
{
unsigned size = archive_handle->file_header->size;
archive_handle->dpkg__buffer = xzalloc(size + 1);
xread(archive_handle->src_fd, archive_handle->dpkg__buffer, size);
}
static char *deb_extract_control_file_to_buffer(archive_handle_t *ar_handle, llist_t *myaccept)
{
ar_handle->dpkg__sub_archive->action_data = data_extract_to_buffer;
ar_handle->dpkg__sub_archive->accept = myaccept;
ar_handle->dpkg__sub_archive->filter = filter_accept_list;
unpack_ar_archive(ar_handle);
close(ar_handle->src_fd);
return ar_handle->dpkg__sub_archive->dpkg__buffer;
}
static void append_control_file_to_llist(const char *package_name, const char *control_name, llist_t **ll)
{
FILE *fp;
char *filename, *line;
filename = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, control_name);
fp = fopen_for_read(filename);
free(filename);
if (fp != NULL) {
while ((line = xmalloc_fgetline(fp)) != NULL)
llist_add_to(ll, line);
fclose(fp);
}
}
static char FAST_FUNC filter_rename_config(archive_handle_t *archive_handle)
{
int fd;
char *name_ptr = archive_handle->file_header->name + 1;
/* Is this file marked as config file? */
if (!find_list_entry(archive_handle->accept, name_ptr))
return EXIT_SUCCESS; /* no */
fd = open(name_ptr, O_RDONLY);
if (fd >= 0) {
md5_ctx_t md5;
char *md5line, *buf;
int count;
/* Calculate MD5 of existing file */
buf = xmalloc(4096);
md5_begin(&md5);
while ((count = safe_read(fd, buf, 4096)) > 0)
md5_hash(&md5, buf, count);
md5_end(&md5, buf); /* using buf as result storage */
close(fd);
md5line = xmalloc(16 * 2 + 2 + strlen(name_ptr) + 1);
sprintf(bin2hex(md5line, buf, 16), " %s", name_ptr);
free(buf);
/* Is it changed after install? */
if (find_list_entry(archive_handle->accept, md5line) == NULL) {
printf("Warning: Creating %s as %s.dpkg-new\n", name_ptr, name_ptr);
archive_handle->file_header->name = xasprintf("%s.dpkg-new", archive_handle->file_header->name);
}
free(md5line);
}
return EXIT_SUCCESS;
}
static void FAST_FUNC data_extract_all_prefix(archive_handle_t *archive_handle)
{
char *name_ptr = archive_handle->file_header->name;
/* Skip all leading "/" */
while (*name_ptr == '/')
name_ptr++;
/* Skip all leading "./" and "../" */
while (name_ptr[0] == '.') {
if (name_ptr[1] == '.')
name_ptr++;
if (name_ptr[1] != '/')
break;
name_ptr += 2;
}
if (name_ptr[0] != '\0') {
archive_handle->file_header->name = xasprintf("%s%s", archive_handle->dpkg__buffer, name_ptr);
data_extract_all(archive_handle);
if (fnmatch("*.dpkg-new", archive_handle->file_header->name, 0) == 0) {
/* remove .dpkg-new suffix */
archive_handle->file_header->name[strlen(archive_handle->file_header->name) - 9] = '\0';
}
}
}
enum {
/* Commands */
OPT_configure = (1 << 0),
OPT_install = (1 << 1),
OPT_list_installed = (1 << 2),
OPT_purge = (1 << 3),
OPT_remove = (1 << 4),
OPT_unpack = (1 << 5),
OPTMASK_cmd = (1 << 6) - 1,
/* Options */
OPT_force = (1 << 6),
OPT_force_ignore_depends = (1 << 7),
OPT_force_confnew = (1 << 8),
OPT_force_confold = (1 << 9),
};
static void unpack_package(deb_file_t *deb_file)
{
const char *package_name = name_hashtable[package_hashtable[deb_file->package]->name];
const unsigned status_num = search_status_hashtable(package_name);
const unsigned status_package_num = status_hashtable[status_num]->package;
char *info_prefix;
char *list_filename;
archive_handle_t *archive_handle;
FILE *out_stream;
llist_t *accept_list;
llist_t *conffile_list;
int i;
/* If existing version, remove it first */
conffile_list = NULL;
if (strcmp(name_hashtable[get_status(status_num, 3)], "installed") == 0) {
/* Package is already installed, remove old version first */
printf("Preparing to replace %s %s (using %s)...\n", package_name,
name_hashtable[package_hashtable[status_package_num]->version],
deb_file->filename);
/* Read md5sums from old package */
if (!(option_mask32 & OPT_force_confold))
append_control_file_to_llist(package_name, "md5sums", &conffile_list);
remove_package(status_package_num, 0);
} else {
printf("Unpacking %s (from %s)...\n", package_name, deb_file->filename);
}
/* Extract control.tar.gz to /var/lib/dpkg/info/<package>.filename */
info_prefix = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "");
archive_handle = init_archive_deb_ar(deb_file->filename);
init_archive_deb_control(archive_handle);
accept_list = NULL;
i = 0;
while (i < ARRAY_SIZE(all_control_files)) {
char *c = xasprintf("./%s", all_control_files[i]);
llist_add_to(&accept_list, c);
i++;
}
archive_handle->dpkg__sub_archive->accept = accept_list;
archive_handle->dpkg__sub_archive->filter = filter_accept_list;
archive_handle->dpkg__sub_archive->action_data = data_extract_all_prefix;
archive_handle->dpkg__sub_archive->dpkg__buffer = info_prefix;
archive_handle->dpkg__sub_archive->ah_flags |= ARCHIVE_UNLINK_OLD;
unpack_ar_archive(archive_handle);
/* Run the preinst prior to extracting */
run_package_script_or_die(package_name, "preinst");
/* Don't overwrite existing config files */
if (!(option_mask32 & OPT_force_confnew))
append_control_file_to_llist(package_name, "conffiles", &conffile_list);
/* Extract data.tar.gz to the root directory */
archive_handle = init_archive_deb_ar(deb_file->filename);
init_archive_deb_data(archive_handle);
archive_handle->dpkg__sub_archive->accept = conffile_list;
/* Why ARCHIVE_REMEMBER_NAMES?
* We want names collected in ->passed list even if conffile_list
* is NULL (otherwise get_header_tar may optimize name saving out):
*/
archive_handle->dpkg__sub_archive->ah_flags |= ARCHIVE_REMEMBER_NAMES | ARCHIVE_UNLINK_OLD;
archive_handle->dpkg__sub_archive->filter = filter_rename_config;
archive_handle->dpkg__sub_archive->action_data = data_extract_all_prefix;
archive_handle->dpkg__sub_archive->dpkg__buffer = (char*)"/"; /* huh? */
unpack_ar_archive(archive_handle);
/* Create the list file */
list_filename = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "list");
out_stream = xfopen_for_write(list_filename);
archive_handle->dpkg__sub_archive->passed = llist_rev(archive_handle->dpkg__sub_archive->passed);
while (archive_handle->dpkg__sub_archive->passed) {
char *filename = llist_pop(&archive_handle->dpkg__sub_archive->passed);
/* the leading . has been stripped by data_extract_all_prefix already */
fprintf(out_stream, "%s\n", filename);
free(filename);
}
fclose(out_stream);
/* change status */
set_status(status_num, "install", 1);
set_status(status_num, "unpacked", 3);
free(info_prefix);
free(list_filename);
}
static void configure_package(deb_file_t *deb_file)
{
const char *package_name = name_hashtable[package_hashtable[deb_file->package]->name];
const char *package_version = name_hashtable[package_hashtable[deb_file->package]->version];
const int status_num = search_status_hashtable(package_name);
printf("Setting up %s (%s)...\n", package_name, package_version);
/* Run the postinst script */
/* TODO: handle failure gracefully */
run_package_script_or_die(package_name, "postinst");
/* Change status to reflect success */
set_status(status_num, "install", 1);
set_status(status_num, "installed", 3);
}
int dpkg_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int dpkg_main(int argc UNUSED_PARAM, char **argv)
{
deb_file_t **deb_file = NULL;
status_node_t *status_node;
char *str_f;
int opt;
int package_num;
int deb_count = 0;
int state_status;
int status_num;
int i;
#if ENABLE_LONG_OPTS
static const char dpkg_longopts[] ALIGN1 =
// FIXME: we use -C non-compatibly, should be:
// "-C|--audit Check for broken package(s)"
"configure\0" No_argument "C"
"force\0" Required_argument "F"
"install\0" No_argument "i"
"list\0" No_argument "l"
"purge\0" No_argument "P"
"remove\0" No_argument "r"
"unpack\0" No_argument "u"
"force-depends\0" No_argument "\xff"
"force-confnew\0" No_argument "\xfe"
"force-confold\0" No_argument "\xfd"
;
#endif
INIT_G();
opt = getopt32long(argv, "CilPruF:", dpkg_longopts, &str_f);
argv += optind;
//if (opt & OPT_configure) ... // -C
if (opt & OPT_force) { // -F (--force in official dpkg)
if (strcmp(str_f, "depends") == 0)
opt |= OPT_force_ignore_depends;
else if (strcmp(str_f, "confnew") == 0)
opt |= OPT_force_confnew;
else if (strcmp(str_f, "confold") == 0)
opt |= OPT_force_confold;
else
bb_show_usage();
option_mask32 = opt;
}
//if (opt & OPT_install) ... // -i
//if (opt & OPT_list_installed) ... // -l
//if (opt & OPT_purge) ... // -P
//if (opt & OPT_remove) ... // -r
//if (opt & OPT_unpack) ... // -u (--unpack in official dpkg)
if (!(opt & OPTMASK_cmd) /* no cmd */
|| ((opt & OPTMASK_cmd) & ((opt & OPTMASK_cmd)-1)) /* more than one cmd */
) {
bb_show_usage();
}
/* puts("(Reading database ... xxxxx files and directories installed.)"); */
index_status_file("/var/lib/dpkg/status");
/* if the list action was given print the installed packages and exit */
if (opt & OPT_list_installed) {
list_packages(argv[0]); /* param can be NULL */
return EXIT_SUCCESS;
}
/* Read arguments and store relevant info in structs */
while (*argv) {
/* deb_count = nb_elem - 1 and we need nb_elem + 1 to allocate terminal node [NULL pointer] */
deb_file = xrealloc_vector(deb_file, 2, deb_count);
deb_file[deb_count] = xzalloc(sizeof(deb_file[0][0]));
if (opt & (OPT_install | OPT_unpack)) {
/* -i/-u: require filename */
archive_handle_t *archive_handle;
llist_t *control_list = NULL;
/* Extract the control file */
llist_add_to(&control_list, (char*)"./control");
archive_handle = init_archive_deb_ar(argv[0]);
init_archive_deb_control(archive_handle);
deb_file[deb_count]->control_file = deb_extract_control_file_to_buffer(archive_handle, control_list);
if (deb_file[deb_count]->control_file == NULL) {
bb_simple_error_msg_and_die("can't extract control file");
}
deb_file[deb_count]->filename = xstrdup(argv[0]);
package_num = fill_package_struct(deb_file[deb_count]->control_file);
if (package_num == -1) {
bb_error_msg("invalid control file in %s", argv[0]);
argv++;
continue;
}
deb_file[deb_count]->package = (unsigned) package_num;
/* Add the package to the status hashtable */
if (opt & (OPT_unpack | OPT_install)) {
/* Try and find a currently installed version of this package */
status_num = search_status_hashtable(name_hashtable[package_hashtable[deb_file[deb_count]->package]->name]);
/* If no previous entry was found initialise a new entry */
if (status_hashtable[status_num] == NULL
|| status_hashtable[status_num]->status == 0
) {
status_node = xmalloc(sizeof(status_node_t));
status_node->package = deb_file[deb_count]->package;
/* reinstreq isn't changed to "ok" until the package control info
* is written to the status file*/
status_node->status = search_name_hashtable("install reinstreq not-installed");
status_hashtable[status_num] = status_node;
} else {
set_status(status_num, "install", 1);
set_status(status_num, "reinstreq", 2);
}
}
} else if (opt & (OPT_configure | OPT_purge | OPT_remove)) {
/* -C/-p/-r: require package name */
deb_file[deb_count]->package = search_package_hashtable(
search_name_hashtable(argv[0]),
search_name_hashtable("ANY"), VER_ANY);
if (package_hashtable[deb_file[deb_count]->package] == NULL) {
bb_error_msg_and_die("package %s is uninstalled or unknown", argv[0]);
}
package_num = deb_file[deb_count]->package;
status_num = search_status_hashtable(name_hashtable[package_hashtable[package_num]->name]);
state_status = get_status(status_num, 3);
/* check package status is "installed" */
if (opt & OPT_remove) {
if (strcmp(name_hashtable[state_status], "not-installed") == 0
|| strcmp(name_hashtable[state_status], "config-files") == 0
) {
bb_error_msg_and_die("%s is already removed", name_hashtable[package_hashtable[package_num]->name]);
}
set_status(status_num, "deinstall", 1);
} else if (opt & OPT_purge) {
/* if package status is "conf-files" then its ok */
if (strcmp(name_hashtable[state_status], "not-installed") == 0) {
bb_error_msg_and_die("%s is already purged", name_hashtable[package_hashtable[package_num]->name]);
}
set_status(status_num, "purge", 1);
}
}
deb_count++;
argv++;
}
if (!deb_count)
bb_simple_error_msg_and_die("no package files specified");
deb_file[deb_count] = NULL;
/* Check that the deb file arguments are installable */
if (!(opt & OPT_force_ignore_depends)) {
if (!check_deps(deb_file, 0 /*, deb_count*/)) {
bb_simple_error_msg_and_die("dependency check failed");
}
}
/* TODO: install or remove packages in the correct dependency order */
for (i = 0; i < deb_count; i++) {
/* Remove or purge packages */
if (opt & OPT_remove) {
remove_package(deb_file[i]->package, 1);
}
else if (opt & OPT_purge) {
purge_package(deb_file[i]->package);
}
else if (opt & OPT_unpack) {
unpack_package(deb_file[i]);
}
else if (opt & OPT_install) {
unpack_package(deb_file[i]);
/* package is configured in second pass below */
}
else if (opt & OPT_configure) {
configure_package(deb_file[i]);
}
}
/* configure installed packages */
if (opt & OPT_install) {
for (i = 0; i < deb_count; i++)
configure_package(deb_file[i]);
}
write_status_file(deb_file);
if (ENABLE_FEATURE_CLEAN_UP) {
for (i = 0; i < deb_count; i++) {
free(deb_file[i]->control_file);
free(deb_file[i]->filename);
free(deb_file[i]);
}
free(deb_file);
for (i = 0; i < NAME_HASH_PRIME; i++) {
free(name_hashtable[i]);
}
for (i = 0; i < PACKAGE_HASH_PRIME; i++) {
free_package(package_hashtable[i]);
}
for (i = 0; i < STATUS_HASH_PRIME; i++) {
free(status_hashtable[i]);
}
}
return EXIT_SUCCESS;
}