busybox/dpkg.c

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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <search.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <utime.h>
#include <sys/types.h>
#include <sys/stat.h>
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#include "busybox.h"
//#define PACKAGE "udpkg"
//#define VERSION "0.1"
/*
* Should we do full dependency checking?
*/
#define DODEPENDS 1
/*
* Should we do debugging?
*/
#define DODEBUG 0
#ifdef DODEBUG
#define SYSTEM(x) do_system(x)
#define DPRINTF(fmt,args...) fprintf(stderr, fmt, ##args)
#else
#define SYSTEM(x) system(x)
#define DPRINTF(fmt,args...) /* nothing */
#endif
#define BUFSIZE 4096
#define ADMINDIR "/var/lib/dpkg"
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#define STATUSFILE ADMINDIR ## "/status.udeb"
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#define DPKGCIDIR ADMINDIR ## "/tmp.ci/"
#define INFODIR ADMINDIR ## "/info/"
#define UDPKG_QUIET "UDPKG_QUIET"
#define DEPENDSMAX 64 /* maximum number of depends we can handle */
//static const int status_wantstart = 0;
//static const int status_wantunknown = (1 << 0);
static const int status_wantinstall = (1 << 1);
//static const int status_wanthold = (1 << 2);
//static const int status_wantdeinstall = (1 << 3);
//static const int status_wantpurge = (1 << 4);
static const int status_wantmask = 31;
//static const int status_flagstart = 5;
static const int status_flagok = (1 << 5); /* 32 */
//static const int status_flagreinstreq = (1 << 6);
//static const int status_flaghold = (1 << 7);
//static const int status_flagholdreinstreq = (1 << 8);
static const int status_flagmask = 480;
//static const int status_statusstart = 9;
//static const int status_statusnoninstalled = (1 << 9); /* 512 */
static const int status_statusunpacked = (1 << 10);
static const int status_statushalfconfigured = (1 << 11);
static const int status_statusinstalled = (1 << 12);
static const int status_statushalfinstalled = (1 << 13);
//static const int status_statusconfigfiles = (1 << 14);
//static const int status_statuspostinstfailed = (1 << 15);
//static const int status_statusremovalfailed = (1 << 16);
static const int status_statusmask = 130560; /* i assume status_statusinstalled is supposed to be included */
static const char *statuswords[][10] = {
{ (char *) 0, "unknown", "install", "hold", "deinstall", "purge", 0 },
{ (char *) 5, "ok", "reinstreq", "hold", "hold-reinstreq", 0 },
{ (char *) 9, "not-installed", "unpacked", "half-configured",
"installed", "half-installed", "config-files",
"post-inst-failed", "removal-failed", 0 }
};
const int color_white = 0;
const int color_grey = 1;
const int color_black = 2;
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/* data structures */
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typedef struct package_s {
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char *file;
char *package;
char *version;
char *depends;
char *provides;
char *description;
int installer_menu_item;
unsigned long status;
char color; /* for topo-sort */
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struct package_s *requiredfor[DEPENDSMAX];
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unsigned short requiredcount;
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struct package_s *next;
} package_t;
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static int package_compare(const void *p1, const void *p2)
{
return strcmp(((package_t *)p1)->package,
((package_t *)p2)->package);
}
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#ifdef DODEPENDS
#include <ctype.h>
static char **depends_split(const char *dependsstr)
{
static char *dependsvec[DEPENDSMAX];
char *p;
int i = 0;
dependsvec[0] = 0;
if (dependsstr != 0)
{
p = strdup(dependsstr);
while (*p != 0 && *p != '\n')
{
if (*p != ' ')
{
if (*p == ',')
{
*p = 0;
dependsvec[++i] = 0;
}
else if (dependsvec[i] == 0)
dependsvec[i] = p;
}
else
*p = 0; /* eat the space... */
p++;
}
*p = 0;
}
dependsvec[i+1] = 0;
return dependsvec;
}
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static void depends_sort_visit(package_t **ordered, package_t *pkgs,
package_t *pkg)
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{
/* Topological sort algorithm:
* ordered is the output list, pkgs is the dependency graph, pkg is
* the current node
*
* recursively add all the adjacent nodes to the ordered list, marking
* each one as visited along the way
*
* yes, this algorithm looks a bit odd when all the params have the
* same type :-)
*/
unsigned short i;
/* mark node as processing */
pkg->color = color_grey;
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/* visit each not-yet-visited node */
for (i = 0; i < pkg->requiredcount; i++)
if (pkg->requiredfor[i]->color == color_white)
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depends_sort_visit(ordered, pkgs, pkg->requiredfor[i]);
#if 0
/* add it to the list */
newnode = (struct package_t *)malloc(sizeof(struct package_t));
/* make a shallow copy */
*newnode = *pkg;
newnode->next = *ordered;
*ordered = newnode;
#endif
pkg->next = *ordered;
*ordered = pkg;
/* mark node as done */
pkg->color = color_black;
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}
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static package_t *depends_sort(package_t *pkgs)
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{
/* TODO: it needs to break cycles in the to-be-installed package
* graph... */
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package_t *ordered = NULL;
package_t *pkg;
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for (pkg = pkgs; pkg != 0; pkg = pkg->next)
pkg->color = color_white;
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for (pkg = pkgs; pkg != 0; pkg = pkg->next)
if (pkg->color == color_white)
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depends_sort_visit(&ordered, pkgs, pkg);
/* Leaks the old list... return the new one... */
return ordered;
}
/* resolve package dependencies --
* for each package in the list of packages to be installed, we parse its
* dependency info to determine if the dependent packages are either
* already installed, or are scheduled to be installed. If both tests fail
* than bail.
*
* The algorithm here is O(n^2*m) where n = number of packages to be
* installed and m is the # of dependencies per package. Not a terribly
* efficient algorithm, but given that at any one time you are unlikely
* to install a very large number of packages it doesn't really matter
*/
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static package_t *depends_resolve(package_t *pkgs, void *status)
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{
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package_t *pkg, *chk;
package_t dependpkg;
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char **dependsvec;
int i;
void *found;
for (pkg = pkgs; pkg != 0; pkg = pkg->next)
{
dependsvec = depends_split(pkg->depends);
i = 0;
while (dependsvec[i] != 0)
{
/* Check for dependencies; first look for installed packages */
dependpkg.package = dependsvec[i];
if ((found = tfind(&dependpkg, &status, package_compare)) == 0 ||
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((chk = *(package_t **)found) &&
(chk->status & (status_flagok | status_statusinstalled)) !=
(status_flagok | status_statusinstalled)))
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{
/* if it fails, we look through the list of packages we are going to
* install */
for (chk = pkgs; chk != 0; chk = chk->next)
{
if (strcmp(chk->package, dependsvec[i]) == 0 ||
(chk->provides &&
strncmp(chk->provides, dependsvec[i], strlen(dependsvec[i])) == 0))
{
if (chk->requiredcount >= DEPENDSMAX)
{
fprintf(stderr, "Too many dependencies for %s\n",
chk->package);
return 0;
}
if (chk != pkg)
chk->requiredfor[chk->requiredcount++] = pkg;
break;
}
}
if (chk == 0)
{
fprintf(stderr, "%s depends on %s, but it is not going to be installed\n", pkg->package, dependsvec[i]);
return 0;
}
}
i++;
}
}
return depends_sort(pkgs);
}
#endif
/* Status file handling routines
*
* This is a fairly minimalistic implementation. there are two main functions
* that are supported:
*
* 1) reading the entire status file:
* the status file is read into memory as a binary-tree, with just the
* package and status info preserved
*
* 2) merging the status file
* control info from (new) packages is merged into the status file,
* replacing any pre-existing entries. when a merge happens, status info
* read using the status_read function is written back to the status file
*/
static unsigned long status_parse(const char *line)
{
char *p;
int i, j;
unsigned long l = 0;
for (i = 0; i < 3; i++)
{
p = strchr(line, ' ');
if (p) *p = 0;
j = 1;
while (statuswords[i][j] != 0)
{
if (strcmp(line, statuswords[i][j]) == 0)
{
l |= (1 << ((int)statuswords[i][0] + j - 1));
break;
}
j++;
}
if (statuswords[i][j] == 0) return 0; /* parse error */
line = p+1;
}
return l;
}
static const char *status_print(unsigned long flags)
{
/* this function returns a static buffer... */
static char buf[256];
int i, j;
buf[0] = 0;
for (i = 0; i < 3; i++)
{
j = 1;
while (statuswords[i][j] != 0)
{
if ((flags & (1 << ((int)statuswords[i][0] + j - 1))) != 0)
{
strcat(buf, statuswords[i][j]);
if (i < 2) strcat(buf, " ");
break;
}
j++;
}
if (statuswords[i][j] == 0)
{
fprintf(stderr, "corrupted status flag!!\n");
return NULL;
}
}
return buf;
}
/*
* Read a control file (or a stanza of a status file) and parse it,
* filling parsed fields into the package structure
*/
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static void control_read(FILE *f, package_t *p)
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{
char buf[BUFSIZE];
while (fgets(buf, BUFSIZE, f) && !feof(f))
{
buf[strlen(buf)-1] = 0;
if (*buf == 0)
return;
else if (strstr(buf, "Package: ") == buf)
{
p->package = strdup(buf+9);
}
else if (strstr(buf, "Status: ") == buf)
{
p->status = status_parse(buf+8);
}
else if (strstr(buf, "Depends: ") == buf)
{
p->depends = strdup(buf+9);
}
else if (strstr(buf, "Provides: ") == buf)
{
p->provides = strdup(buf+10);
}
/* This is specific to the Debian Installer. Ifdef? */
else if (strstr(buf, "installer-menu-item: ") == buf)
{
p->installer_menu_item = atoi(buf+21);
}
else if (strstr(buf, "Description: ") == buf)
{
p->description = strdup(buf+13);
}
/* TODO: localized descriptions */
}
}
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static void *status_read(void)
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{
FILE *f;
void *status = 0;
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package_t *m = 0, *p = 0, *t = 0;
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if ((f = fopen(STATUSFILE, "r")) == NULL)
{
perror(STATUSFILE);
return 0;
}
if (getenv(UDPKG_QUIET) == NULL)
printf("(Reading database...)\n");
while (!feof(f))
{
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m = (package_t *)malloc(sizeof(package_t));
memset(m, 0, sizeof(package_t));
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control_read(f, m);
if (m->package)
{
/*
* If there is an item in the tree by this name,
* it must be a virtual package; insert real
* package in preference.
*/
tdelete(m, &status, package_compare);
tsearch(m, &status, package_compare);
if (m->provides)
{
/*
* A "Provides" triggers the insertion
* of a pseudo package into the status
* binary-tree.
*/
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p = (package_t *)malloc(sizeof(package_t));
memset(p, 0, sizeof(package_t));
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p->package = strdup(m->provides);
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t = *(package_t **)tsearch(p, &status, package_compare);
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if (!(t == p))
{
free(p->package);
free(p);
}
else {
/*
* Pseudo package status is the
* same as the status of the
* package providing it
* FIXME: (not quite right, if 2
* packages of different statuses
* provide it).
*/
t->status = m->status;
}
}
}
else
{
free(m);
}
}
fclose(f);
return status;
}
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static int status_merge(void *status, package_t *pkgs)
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{
FILE *fin, *fout;
char buf[BUFSIZE];
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package_t *pkg = 0, *statpkg = 0;
package_t locpkg;
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int r = 0;
if ((fin = fopen(STATUSFILE, "r")) == NULL)
{
perror(STATUSFILE);
return 0;
}
if ((fout = fopen(STATUSFILE ".new", "w")) == NULL)
{
perror(STATUSFILE ".new");
return 0;
}
if (getenv(UDPKG_QUIET) == NULL)
printf("(Updating database...)\n");
while (fgets(buf, BUFSIZE, fin) && !feof(fin))
{
buf[strlen(buf)-1] = 0; /* trim newline */
/* If we see a package header, find out if it's a package
* that we have processed. if so, we skip that block for
* now (write it at the end).
*
* we also look at packages in the status cache and update
* their status fields
*/
if (strstr(buf, "Package: ") == buf)
{
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for (pkg = pkgs; pkg != 0 && strncmp(buf + 9,
pkg->package, strlen(buf) - 9)!=0;
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pkg = pkg->next) ;
locpkg.package = buf+9;
statpkg = tfind(&locpkg, &status, package_compare);
/* note: statpkg should be non-zero, unless the status
* file was changed while we are processing (no locking
* is currently done...
*/
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if (statpkg != 0) statpkg = *(package_t **)statpkg;
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}
if (pkg != 0) continue;
if (strstr(buf, "Status: ") == buf && statpkg != 0)
{
snprintf(buf, sizeof(buf), "Status: %s",
status_print(statpkg->status));
}
fputs(buf, fout);
fputc('\n', fout);
}
// Print out packages we processed.
for (pkg = pkgs; pkg != 0; pkg = pkg->next) {
fprintf(fout, "Package: %s\nStatus: %s\n",
pkg->package, status_print(pkg->status));
if (pkg->depends)
fprintf(fout, "Depends: %s\n", pkg->depends);
if (pkg->provides)
fprintf(fout, "Provides: %s\n", pkg->provides);
if (pkg->installer_menu_item)
fprintf(fout, "installer-menu-item: %i\n", pkg->installer_menu_item);
if (pkg->description)
fprintf(fout, "Description: %s\n", pkg->description);
fputc('\n', fout);
}
fclose(fin);
fclose(fout);
r = rename(STATUSFILE, STATUSFILE ".bak");
if (r == 0) r = rename(STATUSFILE ".new", STATUSFILE);
return 0;
}
/*
* Main udpkg implementation routines
*/
#ifdef DODEBUG
static int do_system(const char *cmd)
{
DPRINTF("cmd is %s\n", cmd);
return system(cmd);
}
#else
#define do_system(cmd) system(cmd)
#endif
static int is_file(const char *fn)
{
struct stat statbuf;
if (stat(fn, &statbuf) < 0) return 0;
return S_ISREG(statbuf.st_mode);
}
static int dpkg_copyfile(const char *src, const char *dest)
{
/* copy a (regular) file if it exists, preserving the mode, mtime
* and atime */
char buf[8192];
int infd, outfd;
int r;
struct stat srcStat;
struct utimbuf times;
if (stat(src, &srcStat) < 0)
{
if (errno == 2) return 0; else return -1;
}
if ((infd = open(src, O_RDONLY)) < 0)
return -1;
if ((outfd = open(dest, O_WRONLY|O_CREAT|O_TRUNC, srcStat.st_mode)) < 0)
return -1;
while ((r = read(infd, buf, sizeof(buf))) > 0)
{
if (write(outfd, buf, r) < 0)
return -1;
}
close(outfd);
close(infd);
if (r < 0) return -1;
times.actime = srcStat.st_atime;
times.modtime = srcStat.st_mtime;
if (utime(dest, &times) < 0) return -1;
return 1;
}
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static int dpkg_doconfigure(package_t *pkg)
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{
int r;
char postinst[1024];
char buf[1024];
DPRINTF("Configuring %s\n", pkg->package);
pkg->status &= status_statusmask;
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snprintf(postinst, sizeof(postinst), "%s%s.postinst", INFODIR, pkg->package);
if (is_file(postinst))
{
snprintf(buf, sizeof(buf), "%s configure", postinst);
if ((r = do_system(buf)) != 0)
{
fprintf(stderr, "postinst exited with status %d\n", r);
pkg->status |= status_statushalfconfigured;
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return 1;
}
}
pkg->status |= status_statusinstalled;
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return 0;
}
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static int dpkg_dounpack(package_t *pkg)
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{
int r = 0;
char *cwd, *p;
FILE *infp, *outfp;
char buf[1024], buf2[1024];
int i;
char *adminscripts[] = { "prerm", "postrm", "preinst", "postinst",
"conffiles", "md5sums", "shlibs",
"templates" };
DPRINTF("Unpacking %s\n", pkg->package);
cwd = getcwd(0, 0);
chdir("/");
snprintf(buf, sizeof(buf), "ar -p %s data.tar.gz|zcat|tar -xf -", pkg->file);
if (SYSTEM(buf) == 0)
{
/* Installs the package scripts into the info directory */
for (i = 0; i < sizeof(adminscripts) / sizeof(adminscripts[0]);
i++)
{
snprintf(buf, sizeof(buf), "%s%s/%s",
DPKGCIDIR, pkg->package, adminscripts[i]);
snprintf(buf2, sizeof(buf), "%s%s.%s",
INFODIR, pkg->package, adminscripts[i]);
if (dpkg_copyfile(buf, buf2) < 0)
{
fprintf(stderr, "Cannot copy %s to %s: %s\n",
buf, buf2, strerror(errno));
r = 1;
break;
}
else
{
/* ugly hack to create the list file; should
* probably do something more elegant
*
* why oh why does dpkg create the list file
* so oddly...
*/
snprintf(buf, sizeof(buf),
"ar -p %s data.tar.gz|zcat|tar -tf -",
pkg->file);
snprintf(buf2, sizeof(buf2),
"%s%s.list", INFODIR, pkg->package);
if ((infp = popen(buf, "r")) == NULL ||
(outfp = fopen(buf2, "w")) == NULL)
{
fprintf(stderr, "Cannot create %s\n",
buf2);
r = 1;
break;
}
while (fgets(buf, sizeof(buf), infp) &&
!feof(infp))
{
p = buf;
if (*p == '.') p++;
if (*p == '/' && *(p+1) == '\n')
{
*(p+1) = '.';
*(p+2) = '\n';
*(p+3) = 0;
}
if (p[strlen(p)-2] == '/')
{
p[strlen(p)-2] = '\n';
p[strlen(p)-1] = 0;
}
fputs(p, outfp);
}
fclose(infp);
fclose(outfp);
}
}
pkg->status &= status_wantmask;
pkg->status |= status_wantinstall;
pkg->status &= status_flagmask;
pkg->status |= status_flagok;
pkg->status &= status_statusmask;
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if (r == 0)
pkg->status |= status_statusunpacked;
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else
pkg->status |= status_statushalfinstalled;
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}
chdir(cwd);
return r;
}
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static int dpkg_doinstall(package_t *pkg)
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{
DPRINTF("Installing %s\n", pkg->package);
return (dpkg_dounpack(pkg) || dpkg_doconfigure(pkg));
}
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static int dpkg_unpackcontrol(package_t *pkg)
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{
int r = 1;
char *cwd = 0;
char *p;
char buf[1024];
FILE *f;
p = strrchr(pkg->file, '/');
if (p) p++; else p = pkg->file;
p = pkg->package = strdup(p);
while (*p != 0 && *p != '_' && *p != '.') p++;
*p = 0;
cwd = getcwd(0, 0);
snprintf(buf, sizeof(buf), "%s%s", DPKGCIDIR, pkg->package);
DPRINTF("dir = %s\n", buf);
if (mkdir(buf, S_IRWXU) == 0 && chdir(buf) == 0)
{
snprintf(buf, sizeof(buf), "ar -p %s control.tar.gz|zcat|tar -xf -",
pkg->file);
if (SYSTEM(buf) == 0)
{
if ((f = fopen("control", "r")) != NULL) {
control_read(f, pkg);
r = 0;
}
}
}
chdir(cwd);
free(cwd);
return r;
}
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static int dpkg_unpack(package_t *pkgs)
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{
int r = 0;
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package_t *pkg;
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void *status = status_read();
if (SYSTEM("rm -rf -- " DPKGCIDIR) != 0 ||
mkdir(DPKGCIDIR, S_IRWXU) != 0)
{
perror("mkdir");
return 1;
}
for (pkg = pkgs; pkg != 0; pkg = pkg->next)
{
dpkg_unpackcontrol(pkg);
r = dpkg_dounpack(pkg);
if (r != 0) break;
}
status_merge(status, pkgs);
SYSTEM("rm -rf -- " DPKGCIDIR);
return r;
}
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static int dpkg_configure(package_t *pkgs)
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{
int r = 0;
void *found;
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package_t *pkg;
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void *status = status_read();
for (pkg = pkgs; pkg != 0 && r == 0; pkg = pkg->next)
{
found = tfind(pkg, &status, package_compare);
if (found == 0)
{
fprintf(stderr, "Trying to configure %s, but it is not installed\n", pkg->package);
r = 1;
}
else
{
/* configure the package listed in the status file;
* not pkg, as we have info only for the latter */
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r = dpkg_doconfigure(*(package_t **)found);
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}
}
status_merge(status, 0);
return r;
}
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static int dpkg_install(package_t *pkgs)
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{
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package_t *p, *ordered = 0;
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void *status = status_read();
if (SYSTEM("rm -rf -- " DPKGCIDIR) != 0 ||
mkdir(DPKGCIDIR, S_IRWXU) != 0)
{
perror("mkdir");
return 1;
}
/* Stage 1: parse all the control information */
for (p = pkgs; p != 0; p = p->next)
if (dpkg_unpackcontrol(p) != 0)
{
perror(p->file);
/* force loop break, and prevents further ops */
pkgs = 0;
}
/* Stage 2: resolve dependencies */
#ifdef DODEPENDS
ordered = depends_resolve(pkgs, status);
#else
ordered = pkgs;
#endif
/* Stage 3: install */
for (p = ordered; p != 0; p = p->next)
{
p->status &= status_wantmask;
p->status |= status_wantinstall;
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/* for now the flag is always set to ok... this is probably
* not what we want
*/
p->status &= status_flagmask;
p->status |= status_flagok;
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if (dpkg_doinstall(p) != 0)
{
perror(p->file);
}
}
if (ordered != 0)
status_merge(status, pkgs);
SYSTEM("rm -rf -- " DPKGCIDIR);
return 0;
}
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static int dpkg_remove(package_t *pkgs)
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{
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package_t *p;
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void *status = status_read();
for (p = pkgs; p != 0; p = p->next)
{
}
status_merge(status, 0);
return 0;
}
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extern int dpkg_main(int argc, char **argv)
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{
char opt = 0;
char *s;
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package_t *p, *packages = NULL;
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char *cwd = getcwd(0, 0);
while (*++argv)
{
if (**argv == '-') {
/* Nasty little hack to "parse" long options. */
s = *argv;
while (*s == '-')
s++;
opt=s[0];
}
else
{
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p = (package_t *)malloc(sizeof(package_t));
memset(p, 0, sizeof(package_t));
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if (**argv == '/')
p->file = *argv;
else if (opt != 'c')
{
p->file = malloc(strlen(cwd) + strlen(*argv) + 2);
sprintf(p->file, "%s/%s", cwd, *argv);
}
else {
p->package = strdup(*argv);
}
p->next = packages;
packages = p;
}
}
switch (opt)
{
case 'i': return dpkg_install(packages); break;
case 'r': return dpkg_remove(packages); break;
case 'u': return dpkg_unpack(packages); break;
case 'c': return dpkg_configure(packages); break;
}
/* if it falls through to here, some of the command line options were
wrong */
usage(dpkg_usage);
return 0;
}