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Systemd/src/sysv-generator/sysv-generator.c

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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
Copyright 2014 Thomas H.P. Andersen
Copyright 2010 Lennart Poettering
Copyright 2011 Michal Schmidt
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include "alloc-util.h"
#include "dirent-util.h"
#include "exit-status.h"
#include "fd-util.h"
#include "fileio.h"
#include "generator.h"
#include "hashmap.h"
#include "hexdecoct.h"
#include "install.h"
#include "log.h"
#include "mkdir.h"
#include "path-lookup.h"
#include "path-util.h"
#include "set.h"
#include "special.h"
#include "specifier.h"
#include "stat-util.h"
#include "string-util.h"
#include "strv.h"
#include "unit-name.h"
#include "util.h"
static const struct {
const char *path;
const char *target;
} rcnd_table[] = {
/* Standard SysV runlevels for start-up */
{ "rc1.d", SPECIAL_RESCUE_TARGET },
{ "rc2.d", SPECIAL_MULTI_USER_TARGET },
{ "rc3.d", SPECIAL_MULTI_USER_TARGET },
{ "rc4.d", SPECIAL_MULTI_USER_TARGET },
{ "rc5.d", SPECIAL_GRAPHICAL_TARGET },
/* We ignore the SysV runlevels for shutdown here, as SysV services get default dependencies anyway, and that
* means they are shut down anyway at system power off if running. */
};
static const char *arg_dest = "/tmp";
typedef struct SysvStub {
char *name;
char *path;
char *description;
int sysv_start_priority;
char *pid_file;
char **before;
char **after;
char **wants;
char **wanted_by;
bool has_lsb;
bool reload;
bool loaded;
} SysvStub;
static void free_sysvstub(SysvStub *s) {
if (!s)
return;
free(s->name);
free(s->path);
free(s->description);
free(s->pid_file);
strv_free(s->before);
strv_free(s->after);
strv_free(s->wants);
strv_free(s->wanted_by);
free(s);
}
DEFINE_TRIVIAL_CLEANUP_FUNC(SysvStub*, free_sysvstub);
static void free_sysvstub_hashmapp(Hashmap **h) {
hashmap_free_with_destructor(*h, free_sysvstub);
}
static int add_alias(const char *service, const char *alias) {
const char *link;
int r;
assert(service);
assert(alias);
link = strjoina(arg_dest, "/", alias);
r = symlink(service, link);
if (r < 0) {
if (errno == EEXIST)
return 0;
return -errno;
}
return 1;
}
static int generate_unit_file(SysvStub *s) {
_cleanup_free_ char *path_escaped = NULL;
_cleanup_fclose_ FILE *f = NULL;
const char *unit;
char **p;
int r;
assert(s);
if (!s->loaded)
return 0;
path_escaped = specifier_escape(s->path);
if (!path_escaped)
return log_oom();
unit = strjoina(arg_dest, "/", s->name);
/* We might already have a symlink with the same name from a Provides:,
* or from backup files like /etc/init.d/foo.bak. Real scripts always win,
* so remove an existing link */
if (is_symlink(unit) > 0) {
log_warning("Overwriting existing symlink %s with real service.", unit);
(void) unlink(unit);
}
f = fopen(unit, "wxe");
if (!f)
return log_error_errno(errno, "Failed to create unit file %s: %m", unit);
fprintf(f,
"# Automatically generated by systemd-sysv-generator\n\n"
"[Unit]\n"
"Documentation=man:systemd-sysv-generator(8)\n"
"SourcePath=%s\n",
path_escaped);
if (s->description) {
_cleanup_free_ char *t;
t = specifier_escape(s->description);
if (!t)
return log_oom();
fprintf(f, "Description=%s\n", t);
}
STRV_FOREACH(p, s->before)
fprintf(f, "Before=%s\n", *p);
STRV_FOREACH(p, s->after)
fprintf(f, "After=%s\n", *p);
STRV_FOREACH(p, s->wants)
fprintf(f, "Wants=%s\n", *p);
fprintf(f,
"\n[Service]\n"
"Type=forking\n"
"Restart=no\n"
"TimeoutSec=5min\n"
"IgnoreSIGPIPE=no\n"
"KillMode=process\n"
"GuessMainPID=no\n"
"RemainAfterExit=%s\n",
yes_no(!s->pid_file));
if (s->pid_file) {
_cleanup_free_ char *t;
t = specifier_escape(s->pid_file);
if (!t)
return log_oom();
fprintf(f, "PIDFile=%s\n", t);
}
/* Consider two special LSB exit codes a clean exit */
if (s->has_lsb)
fprintf(f,
"SuccessExitStatus=%i %i\n",
EXIT_NOTINSTALLED,
EXIT_NOTCONFIGURED);
fprintf(f,
"ExecStart=%s start\n"
"ExecStop=%s stop\n",
path_escaped, path_escaped);
if (s->reload)
fprintf(f, "ExecReload=%s reload\n", path_escaped);
r = fflush_and_check(f);
if (r < 0)
return log_error_errno(r, "Failed to write unit %s: %m", unit);
STRV_FOREACH(p, s->wanted_by)
(void) generator_add_symlink(arg_dest, *p, "wants", s->name);
return 1;
}
static bool usage_contains_reload(const char *line) {
return (strcasestr(line, "{reload|") ||
strcasestr(line, "{reload}") ||
strcasestr(line, "{reload\"") ||
strcasestr(line, "|reload|") ||
strcasestr(line, "|reload}") ||
strcasestr(line, "|reload\""));
}
static char *sysv_translate_name(const char *name) {
_cleanup_free_ char *c = NULL;
char *res;
c = strdup(name);
if (!c)
return NULL;
res = endswith(c, ".sh");
if (res)
*res = 0;
if (unit_name_mangle(c, 0, &res) < 0)
return NULL;
return res;
}
static int sysv_translate_facility(SysvStub *s, unsigned line, const char *name, char **ret) {
/* We silently ignore the $ prefix here. According to the LSB
* spec it simply indicates whether something is a
* standardized name or a distribution-specific one. Since we
* just follow what already exists and do not introduce new
* uses or names we don't care who introduced a new name. */
static const char * const table[] = {
/* LSB defined facilities */
"local_fs", NULL,
"network", SPECIAL_NETWORK_ONLINE_TARGET,
"named", SPECIAL_NSS_LOOKUP_TARGET,
"portmap", SPECIAL_RPCBIND_TARGET,
"remote_fs", SPECIAL_REMOTE_FS_TARGET,
"syslog", NULL,
"time", SPECIAL_TIME_SYNC_TARGET,
};
const char *filename;
char *filename_no_sh, *e, *m;
const char *n;
unsigned i;
int r;
assert(name);
assert(s);
assert(ret);
filename = basename(s->path);
n = *name == '$' ? name + 1 : name;
for (i = 0; i < ELEMENTSOF(table); i += 2) {
if (!streq(table[i], n))
continue;
if (!table[i+1]) {
*ret = NULL;
return 0;
}
m = strdup(table[i+1]);
if (!m)
return log_oom();
*ret = m;
return 1;
}
/* If we don't know this name, fallback heuristics to figure
* out whether something is a target or a service alias. */
/* Facilities starting with $ are most likely targets */
if (*name == '$') {
r = unit_name_build(n, NULL, ".target", ret);
if (r < 0)
return log_error_errno(r, "[%s:%u] Could not build name for facility %s: %m", s->path, line, name);
return 1;
}
/* Strip ".sh" suffix from file name for comparison */
filename_no_sh = strdupa(filename);
e = endswith(filename_no_sh, ".sh");
if (e) {
*e = '\0';
filename = filename_no_sh;
}
/* Names equaling the file name of the services are redundant */
if (streq_ptr(n, filename)) {
*ret = NULL;
return 0;
}
/* Everything else we assume to be normal service names */
m = sysv_translate_name(n);
if (!m)
return log_oom();
*ret = m;
return 1;
}
static int handle_provides(SysvStub *s, unsigned line, const char *full_text, const char *text) {
int r;
assert(s);
assert(full_text);
assert(text);
for (;;) {
_cleanup_free_ char *word = NULL, *m = NULL;
r = extract_first_word(&text, &word, NULL, EXTRACT_QUOTES|EXTRACT_RELAX);
if (r < 0)
return log_error_errno(r, "[%s:%u] Failed to parse word from provides string: %m", s->path, line);
if (r == 0)
break;
r = sysv_translate_facility(s, line, word, &m);
if (r <= 0) /* continue on error */
continue;
switch (unit_name_to_type(m)) {
case UNIT_SERVICE:
log_debug("Adding Provides: alias '%s' for '%s'", m, s->name);
r = add_alias(s->name, m);
if (r < 0)
log_warning_errno(r, "[%s:%u] Failed to add LSB Provides name %s, ignoring: %m", s->path, line, m);
break;
case UNIT_TARGET:
/* NB: SysV targets which are provided by a
* service are pulled in by the services, as
* an indication that the generic service is
* now available. This is strictly one-way.
* The targets do NOT pull in SysV services! */
r = strv_extend(&s->before, m);
if (r < 0)
return log_oom();
r = strv_extend(&s->wants, m);
if (r < 0)
return log_oom();
if (streq(m, SPECIAL_NETWORK_ONLINE_TARGET)) {
r = strv_extend(&s->before, SPECIAL_NETWORK_TARGET);
if (r < 0)
return log_oom();
r = strv_extend(&s->wants, SPECIAL_NETWORK_TARGET);
if (r < 0)
return log_oom();
}
break;
case _UNIT_TYPE_INVALID:
log_warning("Unit name '%s' is invalid", m);
break;
default:
log_warning("Unknown unit type for unit '%s'", m);
}
}
return 0;
}
static int handle_dependencies(SysvStub *s, unsigned line, const char *full_text, const char *text) {
int r;
assert(s);
assert(full_text);
assert(text);
for (;;) {
_cleanup_free_ char *word = NULL, *m = NULL;
bool is_before;
r = extract_first_word(&text, &word, NULL, EXTRACT_QUOTES|EXTRACT_RELAX);
if (r < 0)
return log_error_errno(r, "[%s:%u] Failed to parse word from provides string: %m", s->path, line);
if (r == 0)
break;
r = sysv_translate_facility(s, line, word, &m);
if (r <= 0) /* continue on error */
continue;
is_before = startswith_no_case(full_text, "X-Start-Before:");
if (streq(m, SPECIAL_NETWORK_ONLINE_TARGET) && !is_before) {
/* the network-online target is special, as it needs to be actively pulled in */
r = strv_extend(&s->after, m);
if (r < 0)
return log_oom();
r = strv_extend(&s->wants, m);
} else
r = strv_extend(is_before ? &s->before : &s->after, m);
if (r < 0)
return log_oom();
}
return 0;
}
static int load_sysv(SysvStub *s) {
_cleanup_fclose_ FILE *f;
unsigned line = 0;
int r;
enum {
NORMAL,
DESCRIPTION,
LSB,
LSB_DESCRIPTION,
USAGE_CONTINUATION
} state = NORMAL;
_cleanup_free_ char *short_description = NULL, *long_description = NULL, *chkconfig_description = NULL;
char *description;
bool supports_reload = false;
char l[LINE_MAX];
assert(s);
f = fopen(s->path, "re");
if (!f) {
if (errno == ENOENT)
return 0;
return log_error_errno(errno, "Failed to open %s: %m", s->path);
}
log_debug("Loading SysV script %s", s->path);
FOREACH_LINE(l, f, goto fail) {
char *t;
line++;
t = strstrip(l);
if (*t != '#') {
/* Try to figure out whether this init script supports
* the reload operation. This heuristic looks for
* "Usage" lines which include the reload option. */
if ( state == USAGE_CONTINUATION ||
(state == NORMAL && strcasestr(t, "usage"))) {
if (usage_contains_reload(t)) {
supports_reload = true;
state = NORMAL;
} else if (t[strlen(t)-1] == '\\')
state = USAGE_CONTINUATION;
else
state = NORMAL;
}
continue;
}
if (state == NORMAL && streq(t, "### BEGIN INIT INFO")) {
state = LSB;
s->has_lsb = true;
continue;
}
if (IN_SET(state, LSB_DESCRIPTION, LSB) && streq(t, "### END INIT INFO")) {
state = NORMAL;
continue;
}
t++;
t += strspn(t, WHITESPACE);
if (state == NORMAL) {
/* Try to parse Red Hat style description */
if (startswith_no_case(t, "description:")) {
size_t k;
const char *j;
k = strlen(t);
if (k > 0 && t[k-1] == '\\') {
state = DESCRIPTION;
t[k-1] = 0;
}
j = empty_to_null(strstrip(t+12));
r = free_and_strdup(&chkconfig_description, j);
if (r < 0)
return log_oom();
} else if (startswith_no_case(t, "pidfile:")) {
const char *fn;
state = NORMAL;
fn = strstrip(t+8);
if (!path_is_absolute(fn)) {
log_error("[%s:%u] PID file not absolute. Ignoring.", s->path, line);
continue;
}
r = free_and_strdup(&s->pid_file, fn);
if (r < 0)
return log_oom();
}
} else if (state == DESCRIPTION) {
/* Try to parse Red Hat style description
* continuation */
size_t k;
char *j;
k = strlen(t);
if (k > 0 && t[k-1] == '\\')
t[k-1] = 0;
else
state = NORMAL;
j = strstrip(t);
if (!isempty(j)) {
char *d = NULL;
if (chkconfig_description)
d = strjoin(chkconfig_description, " ", j);
else
d = strdup(j);
if (!d)
return log_oom();
free(chkconfig_description);
chkconfig_description = d;
}
} else if (IN_SET(state, LSB, LSB_DESCRIPTION)) {
if (startswith_no_case(t, "Provides:")) {
state = LSB;
r = handle_provides(s, line, t, t + 9);
if (r < 0)
return r;
} else if (startswith_no_case(t, "Required-Start:") ||
startswith_no_case(t, "Should-Start:") ||
startswith_no_case(t, "X-Start-Before:") ||
startswith_no_case(t, "X-Start-After:")) {
state = LSB;
r = handle_dependencies(s, line, t, strchr(t, ':') + 1);
if (r < 0)
return r;
} else if (startswith_no_case(t, "Description:")) {
const char *j;
state = LSB_DESCRIPTION;
j = empty_to_null(strstrip(t+12));
r = free_and_strdup(&long_description, j);
if (r < 0)
return log_oom();
} else if (startswith_no_case(t, "Short-Description:")) {
const char *j;
state = LSB;
j = empty_to_null(strstrip(t+18));
r = free_and_strdup(&short_description, j);
if (r < 0)
return log_oom();
} else if (state == LSB_DESCRIPTION) {
if (startswith(l, "#\t") || startswith(l, "# ")) {
const char *j;
j = strstrip(t);
if (!isempty(j)) {
char *d = NULL;
if (long_description)
d = strjoin(long_description, " ", t);
else
d = strdup(j);
if (!d)
return log_oom();
free(long_description);
long_description = d;
}
} else
state = LSB;
}
}
}
s->reload = supports_reload;
/* We use the long description only if
* no short description is set. */
if (short_description)
description = short_description;
else if (chkconfig_description)
description = chkconfig_description;
else if (long_description)
description = long_description;
else
description = NULL;
if (description) {
char *d;
d = strappend(s->has_lsb ? "LSB: " : "SYSV: ", description);
if (!d)
return log_oom();
s->description = d;
}
s->loaded = true;
return 0;
fail:
return log_error_errno(errno, "Failed to read configuration file '%s': %m", s->path);
}
static int fix_order(SysvStub *s, Hashmap *all_services) {
SysvStub *other;
Iterator j;
int r;
assert(s);
if (!s->loaded)
return 0;
if (s->sysv_start_priority < 0)
return 0;
HASHMAP_FOREACH(other, all_services, j) {
if (s == other)
continue;
if (!other->loaded)
continue;
if (other->sysv_start_priority < 0)
continue;
/* If both units have modern headers we don't care
* about the priorities */
if (s->has_lsb && other->has_lsb)
continue;
if (other->sysv_start_priority < s->sysv_start_priority) {
r = strv_extend(&s->after, other->name);
if (r < 0)
return log_oom();
} else if (other->sysv_start_priority > s->sysv_start_priority) {
r = strv_extend(&s->before, other->name);
if (r < 0)
return log_oom();
} else
continue;
/* FIXME: Maybe we should compare the name here lexicographically? */
}
return 0;
}
static int acquire_search_path(const char *def, const char *envvar, char ***ret) {
_cleanup_strv_free_ char **l = NULL;
const char *e;
int r;
assert(def);
assert(envvar);
e = getenv(envvar);
if (e) {
r = path_split_and_make_absolute(e, &l);
if (r < 0)
return log_error_errno(r, "Failed to make $%s search path absolute: %m", envvar);
}
if (strv_isempty(l)) {
strv_free(l);
l = strv_new(def, NULL);
if (!l)
return log_oom();
}
if (!path_strv_resolve_uniq(l, NULL))
return log_oom();
*ret = TAKE_PTR(l);
return 0;
}
static int enumerate_sysv(const LookupPaths *lp, Hashmap *all_services) {
_cleanup_strv_free_ char **sysvinit_path = NULL;
char **path;
int r;
assert(lp);
r = acquire_search_path(SYSTEM_SYSVINIT_PATH, "SYSTEMD_SYSVINIT_PATH", &sysvinit_path);
if (r < 0)
return r;
STRV_FOREACH(path, sysvinit_path) {
_cleanup_closedir_ DIR *d = NULL;
struct dirent *de;
d = opendir(*path);
if (!d) {
if (errno != ENOENT)
log_warning_errno(errno, "Opening %s failed, ignoring: %m", *path);
continue;
}
FOREACH_DIRENT(de, d, log_error_errno(errno, "Failed to enumerate directory %s, ignoring: %m", *path)) {
_cleanup_free_ char *fpath = NULL, *name = NULL;
_cleanup_(free_sysvstubp) SysvStub *service = NULL;
struct stat st;
if (fstatat(dirfd(d), de->d_name, &st, 0) < 0) {
log_warning_errno(errno, "stat() failed on %s/%s, ignoring: %m", *path, de->d_name);
continue;
}
if (!(st.st_mode & S_IXUSR))
continue;
if (!S_ISREG(st.st_mode))
continue;
name = sysv_translate_name(de->d_name);
if (!name)
return log_oom();
if (hashmap_contains(all_services, name))
continue;
r = unit_file_exists(UNIT_FILE_SYSTEM, lp, name);
if (r < 0 && !IN_SET(r, -ELOOP, -ERFKILL, -EADDRNOTAVAIL)) {
log_debug_errno(r, "Failed to detect whether %s exists, skipping: %m", name);
continue;
} else if (r != 0) {
log_debug("Native unit for %s already exists, skipping.", name);
continue;
}
fpath = strjoin(*path, "/", de->d_name);
if (!fpath)
return log_oom();
service = new0(SysvStub, 1);
if (!service)
return log_oom();
service->sysv_start_priority = -1;
service->name = name;
service->path = fpath;
name = fpath = NULL;
r = hashmap_put(all_services, service->name, service);
if (r < 0)
return log_oom();
service = NULL;
}
}
return 0;
}
static int set_dependencies_from_rcnd(const LookupPaths *lp, Hashmap *all_services) {
Set *runlevel_services[ELEMENTSOF(rcnd_table)] = {};
_cleanup_strv_free_ char **sysvrcnd_path = NULL;
SysvStub *service;
unsigned i;
Iterator j;
char **p;
int r;
assert(lp);
r = acquire_search_path(SYSTEM_SYSVRCND_PATH, "SYSTEMD_SYSVRCND_PATH", &sysvrcnd_path);
if (r < 0)
return r;
STRV_FOREACH(p, sysvrcnd_path) {
for (i = 0; i < ELEMENTSOF(rcnd_table); i ++) {
_cleanup_closedir_ DIR *d = NULL;
_cleanup_free_ char *path = NULL;
struct dirent *de;
path = strjoin(*p, "/", rcnd_table[i].path);
if (!path) {
r = log_oom();
goto finish;
}
d = opendir(path);
if (!d) {
if (errno != ENOENT)
log_warning_errno(errno, "Opening %s failed, ignoring: %m", path);
continue;
}
FOREACH_DIRENT(de, d, log_error_errno(errno, "Failed to enumerate directory %s, ignoring: %m", path)) {
_cleanup_free_ char *name = NULL, *fpath = NULL;
int a, b;
if (de->d_name[0] != 'S')
continue;
if (strlen(de->d_name) < 4)
continue;
a = undecchar(de->d_name[1]);
b = undecchar(de->d_name[2]);
if (a < 0 || b < 0)
continue;
fpath = strjoin(*p, "/", de->d_name);
if (!fpath) {
r = log_oom();
goto finish;
}
name = sysv_translate_name(de->d_name + 3);
if (!name) {
r = log_oom();
goto finish;
}
service = hashmap_get(all_services, name);
if (!service) {
log_debug("Ignoring %s symlink in %s, not generating %s.", de->d_name, rcnd_table[i].path, name);
continue;
}
service->sysv_start_priority = MAX(a*10 + b, service->sysv_start_priority);
r = set_ensure_allocated(&runlevel_services[i], NULL);
if (r < 0) {
log_oom();
goto finish;
}
r = set_put(runlevel_services[i], service);
if (r < 0) {
log_oom();
goto finish;
}
}
}
}
for (i = 0; i < ELEMENTSOF(rcnd_table); i ++)
SET_FOREACH(service, runlevel_services[i], j) {
r = strv_extend(&service->before, rcnd_table[i].target);
if (r < 0) {
log_oom();
goto finish;
}
r = strv_extend(&service->wanted_by, rcnd_table[i].target);
if (r < 0) {
log_oom();
goto finish;
}
}
r = 0;
finish:
for (i = 0; i < ELEMENTSOF(rcnd_table); i++)
set_free(runlevel_services[i]);
return r;
}
int main(int argc, char *argv[]) {
_cleanup_(free_sysvstub_hashmapp) Hashmap *all_services = NULL;
_cleanup_lookup_paths_free_ LookupPaths lp = {};
SysvStub *service;
Iterator j;
int r;
if (argc > 1 && argc != 4) {
log_error("This program takes three or no arguments.");
return EXIT_FAILURE;
}
if (argc > 1)
arg_dest = argv[3];
log_set_prohibit_ipc(true);
log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
log_open();
umask(0022);
r = lookup_paths_init(&lp, UNIT_FILE_SYSTEM, LOOKUP_PATHS_EXCLUDE_GENERATED, NULL);
if (r < 0) {
log_error_errno(r, "Failed to find lookup paths: %m");
goto finish;
}
all_services = hashmap_new(&string_hash_ops);
if (!all_services) {
r = log_oom();
goto finish;
}
r = enumerate_sysv(&lp, all_services);
if (r < 0)
goto finish;
r = set_dependencies_from_rcnd(&lp, all_services);
if (r < 0)
goto finish;
HASHMAP_FOREACH(service, all_services, j)
(void) load_sysv(service);
HASHMAP_FOREACH(service, all_services, j) {
(void) fix_order(service, all_services);
(void) generate_unit_file(service);
}
r = 0;
finish:
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
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