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openrc/src/librc-depend.c

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/*
librc-depend
rc service dependency and ordering
Copyright 2006-2007 Gentoo Foundation
*/
#include "librc.h"
#define GENDEP RC_LIBDIR "/sh/gendepends.sh"
#define RC_DEPCONFIG RC_SVCDIR "/depconfig"
static const char *bootlevel = NULL;
/* We use this so we can pass our char array through many functions */
struct lhead
{
char **list;
};
static char *get_shell_value (char *string)
{
char *p = string;
char *e;
if (! string)
return (NULL);
if (*p == '\'')
p++;
e = p + strlen (p) - 1;
if (*e == '\n')
*e-- = 0;
if (*e == '\'')
*e-- = 0;
if (*p != 0)
return p;
return (NULL);
}
void rc_deptree_free (rc_depinfo_t *deptree)
{
rc_depinfo_t *di = deptree;
while (di)
{
rc_depinfo_t *dip = di->next;
rc_deptype_t *dt = di->depends;
free (di->service);
while (dt)
{
rc_deptype_t *dtp = dt->next;
free (dt->type);
rc_strlist_free (dt->services);
free (dt);
dt = dtp;
}
free (di);
di = dip;
}
}
librc_hidden_def(rc_deptree_free)
rc_depinfo_t *rc_deptree_load (void)
{
FILE *fp;
rc_depinfo_t *deptree = NULL;
rc_depinfo_t *depinfo = NULL;
rc_deptype_t *deptype = NULL;
char buffer [RC_LINEBUFFER];
char *type;
char *p;
char *e;
int i;
if (! (fp = fopen (RC_DEPTREE, "r")))
return (NULL);
while (fgets (buffer, RC_LINEBUFFER, fp))
{
p = buffer;
e = strsep (&p, "_");
if (! e || strcmp (e, "depinfo") != 0)
continue;
e = strsep (&p, "_");
if (! e || sscanf (e, "%d", &i) != 1)
continue;
if (! (type = strsep (&p, "_=")))
continue;
if (strcmp (type, "service") == 0)
{
/* Sanity */
e = get_shell_value (p);
if (! e || strlen (e) == 0)
continue;
if (! deptree)
{
deptree = rc_xmalloc (sizeof (rc_depinfo_t));
depinfo = deptree;
}
else
{
depinfo->next = rc_xmalloc (sizeof (rc_depinfo_t));
depinfo = depinfo->next;
}
memset (depinfo, 0, sizeof (rc_depinfo_t));
depinfo->service = rc_xstrdup (e);
deptype = NULL;
continue;
}
e = strsep (&p, "=");
if (! e || sscanf (e, "%d", &i) != 1)
continue;
/* Sanity */
e = get_shell_value (p);
if (! e || strlen (e) == 0)
continue;
if (! deptype)
{
depinfo->depends = rc_xmalloc (sizeof (rc_deptype_t));
deptype = depinfo->depends;
memset (deptype, 0, sizeof (rc_deptype_t));
}
else
if (strcmp (deptype->type, type) != 0)
{
deptype->next = rc_xmalloc (sizeof (rc_deptype_t));
deptype = deptype->next;
memset (deptype, 0, sizeof (rc_deptype_t));
}
if (! deptype->type)
deptype->type = rc_xstrdup (type);
rc_strlist_addsort (&deptype->services, e);
}
fclose (fp);
return (deptree);
}
librc_hidden_def(rc_deptree_load)
rc_depinfo_t *rc_deptree_depinfo (rc_depinfo_t *deptree, const char *service)
{
rc_depinfo_t *di;
if (! deptree || ! service)
return (NULL);
for (di = deptree; di; di = di->next)
if (strcmp (di->service, service) == 0)
return (di);
return (NULL);
}
librc_hidden_def(rc_deptree_depinfo)
rc_deptype_t *rc_deptree_deptype (rc_depinfo_t *depinfo, const char *type)
{
rc_deptype_t *dt;
if (! depinfo || !type)
return (NULL);
for (dt = depinfo->depends; dt; dt = dt->next)
if (strcmp (dt->type, type) == 0)
return (dt);
return (NULL);
}
librc_hidden_def(rc_deptree_deptype)
static bool valid_service (const char *runlevel, const char *service)
{
rc_service_state_t state = rc_service_state (service);
return ((strcmp (runlevel, bootlevel) != 0 &&
rc_service_in_runlevel (service, bootlevel)) ||
rc_service_in_runlevel (service, runlevel) ||
state & RC_SERVICE_COLDPLUGGED ||
state & RC_SERVICE_STARTED);
}
static bool get_provided1 (const char *runlevel, struct lhead *providers,
rc_deptype_t *deptype,
const char *level, bool coldplugged,
rc_service_state_t state)
{
char *service;
int i;
bool retval = false;
STRLIST_FOREACH (deptype->services, service, i)
{
bool ok = true;
rc_service_state_t s = rc_service_state (service);
if (level)
ok = rc_service_in_runlevel (service, level);
else if (coldplugged)
ok = (s & RC_SERVICE_COLDPLUGGED &&
! rc_service_in_runlevel (service, runlevel) &&
! rc_service_in_runlevel (service, bootlevel));
if (! ok)
continue;
switch (state) {
case RC_SERVICE_STARTED:
ok = (s & RC_SERVICE_STARTED);
break;
case RC_SERVICE_INACTIVE:
case RC_SERVICE_STARTING:
case RC_SERVICE_STOPPING:
ok = (s & RC_SERVICE_STARTING ||
s & RC_SERVICE_STOPPING ||
s & RC_SERVICE_INACTIVE);
break;
default:
break;
}
if (! ok)
continue;
retval = true;
rc_strlist_add (&providers->list, service);
}
return (retval);
}
/* Work out if a service is provided by another service.
For example metalog provides logger.
We need to be able to handle syslogd providing logger too.
We do this by checking whats running, then what's starting/stopping,
then what's run in the runlevels and finally alphabetical order.
If there are any bugs in rc-depend, they will probably be here as
provided dependancy can change depending on runlevel state.
*/
static char **get_provided (rc_depinfo_t *deptree, rc_depinfo_t *depinfo,
const char *runlevel, int options)
{
rc_deptype_t *dt;
struct lhead providers;
char *service;
int i;
if (! deptree || ! depinfo)
return (NULL);
if (rc_service_exists (depinfo->service))
return (NULL);
dt = rc_deptree_deptype (depinfo, "providedby");
if (! dt)
return (NULL);
memset (&providers, 0, sizeof (struct lhead));
/* If we are stopping then all depends are true, regardless of state.
This is especially true for net services as they could force a restart
of the local dns resolver which may depend on net. */
if (options & RC_DEP_STOP)
{
STRLIST_FOREACH (dt->services, service, i)
rc_strlist_add (&providers.list, service);
return (providers.list);
}
/* If we're strict, then only use what we have in our runlevel
* and bootlevel */
if (options & RC_DEP_STRICT)
{
STRLIST_FOREACH (dt->services, service, i)
if (rc_service_in_runlevel (service, runlevel) ||
rc_service_in_runlevel (service, bootlevel))
rc_strlist_add (&providers.list, service);
if (providers.list)
return (providers.list);
}
/* OK, we're not strict or there were no services in our runlevel.
This is now where the logic gets a little fuzzy :)
If there is >1 running service then we return NULL.
We do this so we don't hang around waiting for inactive services and
our need has already been satisfied as it's not strict.
We apply this to our runlevel, coldplugged services, then bootlevel
and finally any running.*/
#define DO \
if (providers.list && providers.list[0] && providers.list[1]) \
{ \
rc_strlist_free (providers.list); \
return (NULL); \
} \
else if (providers.list) \
return providers.list; \
/* Anything in the runlevel has to come first */
if (get_provided1 (runlevel, &providers, dt, runlevel, false, RC_SERVICE_STARTED))
{ DO }
if (get_provided1 (runlevel, &providers, dt, runlevel, false, RC_SERVICE_STARTING))
return (providers.list);
if (get_provided1 (runlevel, &providers, dt, runlevel, false, RC_SERVICE_STOPPED))
return (providers.list);
/* Check coldplugged services */
if (get_provided1 (runlevel, &providers, dt, NULL, true, RC_SERVICE_STARTED))
{ DO }
if (get_provided1 (runlevel, &providers, dt, NULL, true, RC_SERVICE_STARTING))
return (providers.list);
/* Check bootlevel if we're not in it */
if (bootlevel && strcmp (runlevel, bootlevel) != 0)
{
if (get_provided1 (runlevel, &providers, dt, bootlevel, false, RC_SERVICE_STARTED))
{ DO }
if (get_provided1 (runlevel, &providers, dt, bootlevel, false, RC_SERVICE_STARTING))
return (providers.list);
}
/* Check coldplugged services */
if (get_provided1 (runlevel, &providers, dt, NULL, true, RC_SERVICE_STOPPED))
{ DO }
/* Check manually started */
if (get_provided1 (runlevel, &providers, dt, NULL, false, RC_SERVICE_STARTED))
{ DO }
if (get_provided1 (runlevel, &providers, dt, NULL, false, RC_SERVICE_STARTING))
return (providers.list);
/* Nothing started then. OK, lets get the stopped services */
if (get_provided1 (runlevel, &providers, dt, runlevel, false, RC_SERVICE_STOPPED))
return (providers.list);
if (bootlevel && (strcmp (runlevel, bootlevel) != 0)
&& (get_provided1 (runlevel, &providers, dt, bootlevel, false, RC_SERVICE_STOPPED)))
return (providers.list);
/* Still nothing? OK, list all services */
STRLIST_FOREACH (dt->services, service, i)
rc_strlist_add (&providers.list, service);
return (providers.list);
}
static void visit_service (rc_depinfo_t *deptree, char **types,
struct lhead *sorted, struct lhead *visited,
rc_depinfo_t *depinfo,
const char *runlevel, int options)
{
int i, j, k;
char *lp, *item;
char *service;
rc_depinfo_t *di;
rc_deptype_t *dt;
char **provides;
char *svcname;
if (! deptree || !sorted || !visited || !depinfo)
return;
/* Check if we have already visited this service or not */
STRLIST_FOREACH (visited->list, item, i)
if (strcmp (item, depinfo->service) == 0)
return;
/* Add ourselves as a visited service */
rc_strlist_add (&visited->list, depinfo->service);
STRLIST_FOREACH (types, item, i)
{
if ((dt = rc_deptree_deptype (depinfo, item)))
{
STRLIST_FOREACH (dt->services, service, j)
{
if (! options & RC_DEP_TRACE || strcmp (item, "iprovide") == 0)
{
rc_strlist_add (&sorted->list, service);
continue;
}
di = rc_deptree_depinfo (deptree, service);
if ((provides = get_provided (deptree, di, runlevel, options)))
{
STRLIST_FOREACH (provides, lp, k)
{
di = rc_deptree_depinfo (deptree, lp);
if (di && (strcmp (item, "ineed") == 0 ||
strcmp (item, "needsme") == 0 ||
valid_service (runlevel, di->service)))
visit_service (deptree, types, sorted, visited, di,
runlevel, options | RC_DEP_TRACE);
}
rc_strlist_free (provides);
}
else
if (di && (strcmp (item, "ineed") == 0 ||
strcmp (item, "needsme") == 0 ||
valid_service (runlevel, service)))
visit_service (deptree, types, sorted, visited, di,
runlevel, options | RC_DEP_TRACE);
}
}
}
/* Now visit the stuff we provide for */
if (options & RC_DEP_TRACE &&
(dt = rc_deptree_deptype (depinfo, "iprovide")))
{
STRLIST_FOREACH (dt->services, service, i)
{
if ((di = rc_deptree_depinfo (deptree, service)))
if ((provides = get_provided (deptree, di, runlevel, options)))
{
STRLIST_FOREACH (provides, lp, j)
if (strcmp (lp, depinfo->service) == 0)
{
visit_service (deptree, types, sorted, visited, di,
runlevel, options | RC_DEP_TRACE);
break;
}
rc_strlist_free (provides);
}
}
}
/* We've visited everything we need, so add ourselves unless we
are also the service calling us or we are provided by something */
svcname = getenv("SVCNAME");
if (! svcname || strcmp (svcname, depinfo->service) != 0)
if (! rc_deptree_deptype (depinfo, "providedby"))
rc_strlist_add (&sorted->list, depinfo->service);
}
char **rc_deptree_depends (rc_depinfo_t *deptree,
char **types, char **services,
const char *runlevel, int options)
{
struct lhead sorted;
struct lhead visited;
rc_depinfo_t *di;
char *service;
int i;
if (! deptree || ! types || ! services)
return (NULL);
memset (&sorted, 0, sizeof (struct lhead));
memset (&visited, 0, sizeof (struct lhead));
bootlevel = getenv ("RC_BOOTLEVEL");
if (! bootlevel)
bootlevel = RC_LEVEL_BOOT;
STRLIST_FOREACH (services, service, i)
{
di = rc_deptree_depinfo (deptree, service);
visit_service (deptree, types, &sorted, &visited, di, runlevel, options);
}
rc_strlist_free (visited.list);
return (sorted.list);
}
librc_hidden_def(rc_deptree_depends)
char **rc_deptree_order_services (rc_depinfo_t *deptree, const char *runlevel,
int options)
{
char **list = NULL;
char **types = NULL;
char **services = NULL;
bool reverse = false;
char **tmp = NULL;
if (! runlevel)
return (NULL);
bootlevel = getenv ("RC_BOOTLEVEL");
if (! bootlevel)
bootlevel = RC_LEVEL_BOOT;
/* When shutting down, list all running services */
if (strcmp (runlevel, RC_LEVEL_SINGLE) == 0 ||
strcmp (runlevel, RC_LEVEL_SHUTDOWN) == 0 ||
strcmp (runlevel, RC_LEVEL_REBOOT) == 0)
{
list = rc_ls_dir (RC_SVCDIR_STARTING, RC_LS_INITD);
tmp = rc_ls_dir (RC_SVCDIR_INACTIVE, RC_LS_INITD);
rc_strlist_join (&list, tmp);
rc_strlist_free (tmp);
tmp = rc_ls_dir (RC_SVCDIR_INACTIVE, RC_LS_INITD);
rc_strlist_join (&list, tmp);
rc_strlist_free (tmp);
reverse = true;
} else {
list = rc_services_in_runlevel (runlevel);
/* Add coldplugged services */
tmp = rc_ls_dir (RC_SVCDIR_COLDPLUGGED, RC_LS_INITD);
rc_strlist_join (&list, tmp);
rc_strlist_free (tmp);
/* If we're not the boot runlevel then add that too */
if (strcmp (runlevel, bootlevel) != 0) {
char *path = rc_strcatpaths (RC_RUNLEVELDIR, bootlevel,
(char *) NULL);
tmp = rc_ls_dir (path, RC_LS_INITD);
rc_strlist_join (&list, tmp);
rc_strlist_free (tmp);
free (path);
}
}
/* Now we have our lists, we need to pull in any dependencies
and order them */
rc_strlist_add (&types, "ineed");
rc_strlist_add (&types, "iuse");
rc_strlist_add (&types, "iafter");
services = rc_deptree_depends (deptree, types, list, runlevel,
RC_DEP_STRICT | RC_DEP_TRACE | options);
rc_strlist_free (list);
rc_strlist_free (types);
if (reverse)
rc_strlist_reverse (services);
return (services);
}
librc_hidden_def(rc_deptree_order_services)
static bool is_newer_than (const char *file, const char *target)
{
struct stat buf;
time_t mtime;
if (stat (file, &buf) != 0 || buf.st_size == 0)
return (false);
mtime = buf.st_mtime;
/* Of course we are newever than targets that don't exist
Such as broken symlinks */
if (stat (target, &buf) != 0)
return (true);
if (mtime < buf.st_mtime)
return (false);
if (rc_is_dir (target))
{
char **targets = rc_ls_dir (target, 0);
char *t;
int i;
bool newer = true;
STRLIST_FOREACH (targets, t, i)
{
char *path = rc_strcatpaths (target, t, (char *) NULL);
newer = is_newer_than (file, path);
free (path);
if (! newer)
break;
}
rc_strlist_free (targets);
return (newer);
}
return (true);
}
typedef struct deppair
{
const char *depend;
const char *addto;
} deppair_t;
static const deppair_t deppairs[] = {
{ "ineed", "needsme" },
{ "iuse", "usesme" },
{ "iafter", "ibefore" },
{ "ibefore", "iafter" },
{ "iprovide", "providedby" },
{ NULL, NULL }
};
static const char *depdirs[] =
{
RC_SVCDIR "/starting",
RC_SVCDIR "/started",
RC_SVCDIR "/stopping",
RC_SVCDIR "/inactive",
RC_SVCDIR "/wasinactive",
RC_SVCDIR "/failed",
RC_SVCDIR "/coldplugged",
RC_SVCDIR "/daemons",
RC_SVCDIR "/options",
RC_SVCDIR "/exclusive",
RC_SVCDIR "/scheduled",
NULL
};
bool rc_deptree_update_needed (void)
{
bool newer = false;
char **config;
char *service;
int i;
/* Create base directories if needed */
for (i = 0; depdirs[i]; i++)
if (mkdir (depdirs[i], 0755) != 0 && errno != EEXIST)
fprintf (stderr, "mkdir `%s': %s", depdirs[i], strerror (errno));
/* Quick test to see if anything we use has changed */
if (! is_newer_than (RC_DEPTREE, RC_INITDIR) ||
! is_newer_than (RC_DEPTREE, RC_CONFDIR) ||
! is_newer_than (RC_DEPTREE, "/etc/rc.conf"))
return (true);
/* Some init scripts dependencies change depending on config files
* outside of baselayout, like syslog-ng, so we check those too. */
config = rc_get_list (RC_DEPCONFIG);
STRLIST_FOREACH (config, service, i) {
if (! is_newer_than (RC_DEPTREE, service)) {
newer = true;
break;
}
}
rc_strlist_free (config);
return (newer);
}
librc_hidden_def(rc_deptree_update_needed)
/* This is a 5 phase operation
Phase 1 is a shell script which loads each init script and config in turn
and echos their dependency info to stdout
Phase 2 takes that and populates a depinfo object with that data
Phase 3 adds any provided services to the depinfo object
Phase 4 scans that depinfo object and puts in backlinks
Phase 5 saves the depinfo object to disk
*/
int rc_deptree_update (void)
{
char *depends;
char *service;
char *type;
char *depend;
char **config = NULL;
int retval = 0;
FILE *fp;
rc_depinfo_t *deptree;
rc_depinfo_t *depinfo;
rc_depinfo_t *di;
rc_depinfo_t *last_depinfo = NULL;
rc_deptype_t *deptype = NULL;
rc_deptype_t *dt;
rc_deptype_t *last_deptype = NULL;
char buffer[RC_LINEBUFFER];
int len;
int i;
int j;
int k;
bool already_added;
/* Some init scripts need RC_LIBDIR to source stuff
Ideally we should be setting our full env instead */
if (! getenv ("RC_LIBDIR"))
setenv ("RC_LIBDIR", RC_LIBDIR, 0);
/* Phase 1 */
if (! (fp = popen (GENDEP, "r")))
return (-1);
deptree = rc_xmalloc (sizeof (rc_depinfo_t));
memset (deptree, 0, sizeof (rc_depinfo_t));
memset (buffer, 0, RC_LINEBUFFER);
/* Phase 2 */
while (fgets (buffer, RC_LINEBUFFER, fp))
{
/* Trim the newline */
if (buffer[strlen (buffer) - 1] == '\n')
buffer[strlen(buffer) -1] = 0;
depends = buffer;
service = strsep (&depends, " ");
if (! service)
continue;
type = strsep (&depends, " ");
for (depinfo = deptree; depinfo; depinfo = depinfo->next)
{
last_depinfo = depinfo;
if (depinfo->service && strcmp (depinfo->service, service) == 0)
break;
}
if (! depinfo)
{
if (! last_depinfo->service)
depinfo = last_depinfo;
else
{
last_depinfo->next = rc_xmalloc (sizeof (rc_depinfo_t));
depinfo = last_depinfo->next;
}
memset (depinfo, 0, sizeof (rc_depinfo_t));
depinfo->service = rc_xstrdup (service);
}
/* We may not have any depends */
if (! type || ! depends)
continue;
/* Get the type */
if (strcmp (type, "config") != 0) {
last_deptype = NULL;
for (deptype = depinfo->depends; deptype; deptype = deptype->next)
{
last_deptype = deptype;
if (strcmp (deptype->type, type) == 0)
break;
}
if (! deptype)
{
if (! last_deptype)
{
depinfo->depends = rc_xmalloc (sizeof (rc_deptype_t));
deptype = depinfo->depends;
}
else
{
last_deptype->next = rc_xmalloc (sizeof (rc_deptype_t));
deptype = last_deptype->next;
}
memset (deptype, 0, sizeof (rc_deptype_t));
deptype->type = rc_xstrdup (type);
}
}
/* Now add each depend to our type.
We do this individually so we handle multiple spaces gracefully */
while ((depend = strsep (&depends, " ")))
{
if (depend[0] == 0)
continue;
if (strcmp (type, "config") == 0) {
rc_strlist_addsort (&config, depend);
continue;
}
/* .sh files are not init scripts */
len = strlen (depend);
if (len > 2 &&
depend[len - 3] == '.' &&
depend[len - 2] == 's' &&
depend[len - 1] == 'h')
continue;
rc_strlist_addsort (&deptype->services, depend);
}
}
pclose (fp);
/* Phase 3 - add our providors to the tree */
for (depinfo = deptree; depinfo; depinfo = depinfo->next)
{
if ((deptype = rc_deptree_deptype (depinfo, "iprovide")))
STRLIST_FOREACH (deptype->services, service, i)
{
for (di = deptree; di; di = di->next)
{
last_depinfo = di;
if (strcmp (di->service, service) == 0)
break;
}
if (! di)
{
last_depinfo->next = rc_xmalloc (sizeof (rc_depinfo_t));
di = last_depinfo->next;
memset (di, 0, sizeof (rc_depinfo_t));
di->service = rc_xstrdup (service);
}
}
}
/* Phase 4 - backreference our depends */
for (depinfo = deptree; depinfo; depinfo = depinfo->next)
{
for (i = 0; deppairs[i].depend; i++)
{
deptype = rc_deptree_deptype (depinfo, deppairs[i].depend);
if (! deptype)
continue;
STRLIST_FOREACH (deptype->services, service, j)
{
di = rc_deptree_depinfo (deptree, service);
if (! di)
{
if (strcmp (deptype->type, "ineed") == 0)
{
fprintf (stderr,
"Service `%s' needs non existant service `%s'",
depinfo->service, service);
retval = -1;
}
continue;
}
/* Add our deptype now */
last_deptype = NULL;
for (dt = di->depends; dt; dt = dt->next)
{
last_deptype = dt;
if (strcmp (dt->type, deppairs[i].addto) == 0)
break;
}
if (! dt)
{
if (! last_deptype)
{
di->depends = rc_xmalloc (sizeof (rc_deptype_t));
dt = di->depends;
}
else
{
last_deptype->next = rc_xmalloc (sizeof (rc_deptype_t));
dt = last_deptype->next;
}
memset (dt, 0, sizeof (rc_deptype_t));
dt->type = rc_xstrdup (deppairs[i].addto);
}
already_added = false;
STRLIST_FOREACH (dt->services, service, k)
if (strcmp (service, depinfo->service) == 0)
{
already_added = true;
break;
}
if (! already_added)
rc_strlist_addsort (&dt->services, depinfo->service);
}
}
}
/* Phase 5 - save to disk
Now that we're purely in C, do we need to keep a shell parseable file?
I think yes as then it stays human readable
This works and should be entirely shell parseable provided that depend
names don't have any non shell variable characters in
*/
if ((fp = fopen (RC_DEPTREE, "w"))) {
i = 0;
for (depinfo = deptree; depinfo; depinfo = depinfo->next)
{
fprintf (fp, "depinfo_%d_service='%s'\n", i, depinfo->service);
for (deptype = depinfo->depends; deptype; deptype = deptype->next)
{
k = 0;
STRLIST_FOREACH (deptype->services, service, j)
{
fprintf (fp, "depinfo_%d_%s_%d='%s'\n", i, deptype->type,
k, service);
k++;
}
}
i++;
}
fclose (fp);
} else
fprintf (stderr, "fopen `%s': %s", RC_DEPTREE, strerror (errno));
/* Save our external config files to disk */
if (config) {
if ((fp = fopen (RC_DEPCONFIG, "w"))) {
STRLIST_FOREACH (config, service, i)
fprintf (fp, "%s\n", service);
fclose (fp);
} else
fprintf (stderr, "fopen `%s': %s\n", RC_DEPCONFIG, strerror (errno));
rc_strlist_free (config);
}
rc_deptree_free (deptree);
return (retval);
}
librc_hidden_def(rc_deptree_update)
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