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-rw-r--r--src/shared/path-lookup.c430
1 files changed, 430 insertions, 0 deletions
diff --git a/src/shared/path-lookup.c b/src/shared/path-lookup.c
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--- /dev/null
+++ b/src/shared/path-lookup.c
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+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ 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 <assert.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "util.h"
+#include "mkdir.h"
+#include "strv.h"
+#include "path-util.h"
+#include "path-lookup.h"
+
+static const char* const systemd_running_as_table[_SYSTEMD_RUNNING_AS_MAX] = {
+ [SYSTEMD_SYSTEM] = "system",
+ [SYSTEMD_USER] = "user"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(systemd_running_as, SystemdRunningAs);
+
+int user_config_home(char **config_home) {
+ const char *e;
+
+ e = getenv("XDG_CONFIG_HOME");
+ if (e) {
+ if (asprintf(config_home, "%s/systemd/user", e) < 0)
+ return -ENOMEM;
+
+ return 1;
+ } else {
+ const char *home;
+
+ home = getenv("HOME");
+ if (home) {
+ if (asprintf(config_home, "%s/.config/systemd/user", home) < 0)
+ return -ENOMEM;
+
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+static char** user_dirs(
+ const char *generator,
+ const char *generator_early,
+ const char *generator_late) {
+
+ const char * const config_unit_paths[] = {
+ USER_CONFIG_UNIT_PATH,
+ "/etc/systemd/user",
+ "/run/systemd/user",
+ NULL
+ };
+
+ const char * const data_unit_paths[] = {
+ "/usr/local/lib/systemd/user",
+ "/usr/local/share/systemd/user",
+ USER_DATA_UNIT_PATH,
+ "/usr/lib/systemd/user",
+ "/usr/share/systemd/user",
+ NULL
+ };
+
+ const char *home, *e;
+ char *config_home = NULL, *data_home = NULL;
+ char **config_dirs = NULL, **data_dirs = NULL;
+ char **r = NULL, **t;
+
+ /* Implement the mechanisms defined in
+ *
+ * http://standards.freedesktop.org/basedir-spec/basedir-spec-0.6.html
+ *
+ * We look in both the config and the data dirs because we
+ * want to encourage that distributors ship their unit files
+ * as data, and allow overriding as configuration.
+ */
+
+ if (user_config_home(&config_home) < 0)
+ goto fail;
+
+ home = getenv("HOME");
+
+ e = getenv("XDG_CONFIG_DIRS");
+ if (e) {
+ config_dirs = strv_split(e, ":");
+ if (!config_dirs)
+ goto fail;
+ }
+
+ /* We don't treat /etc/xdg/systemd here as the spec
+ * suggests because we assume that that is a link to
+ * /etc/systemd/ anyway. */
+
+ e = getenv("XDG_DATA_HOME");
+ if (e) {
+ if (asprintf(&data_home, "%s/systemd/user", e) < 0)
+ goto fail;
+
+ } else if (home) {
+ if (asprintf(&data_home, "%s/.local/share/systemd/user", home) < 0)
+ goto fail;
+
+ /* There is really no need for two unit dirs in $HOME,
+ * except to be fully compliant with the XDG spec. We
+ * now try to link the two dirs, so that we can
+ * minimize disk seeks a little. Further down we'll
+ * then filter out this link, if it is actually is
+ * one. */
+
+ mkdir_parents_label(data_home, 0777);
+ (void) symlink("../../../.config/systemd/user", data_home);
+ }
+
+ e = getenv("XDG_DATA_DIRS");
+ if (e)
+ data_dirs = strv_split(e, ":");
+ else
+ data_dirs = strv_new("/usr/local/share",
+ "/usr/share",
+ NULL);
+ if (!data_dirs)
+ goto fail;
+
+ /* Now merge everything we found. */
+ if (generator_early) {
+ t = strv_append(r, generator_early);
+ if (!t)
+ goto fail;
+ strv_free(r);
+ r = t;
+ }
+
+ if (config_home) {
+ t = strv_append(r, config_home);
+ if (!t)
+ goto fail;
+ strv_free(r);
+ r = t;
+ }
+
+ if (!strv_isempty(config_dirs)) {
+ t = strv_merge_concat(r, config_dirs, "/systemd/user");
+ if (!t)
+ goto finish;
+ strv_free(r);
+ r = t;
+ }
+
+ t = strv_merge(r, (char**) config_unit_paths);
+ if (!t)
+ goto fail;
+ strv_free(r);
+ r = t;
+
+ if (generator) {
+ t = strv_append(r, generator);
+ if (!t)
+ goto fail;
+ strv_free(r);
+ r = t;
+ }
+
+ if (data_home) {
+ t = strv_append(r, data_home);
+ if (!t)
+ goto fail;
+ strv_free(r);
+ r = t;
+ }
+
+ if (!strv_isempty(data_dirs)) {
+ t = strv_merge_concat(r, data_dirs, "/systemd/user");
+ if (!t)
+ goto fail;
+ strv_free(r);
+ r = t;
+ }
+
+ t = strv_merge(r, (char**) data_unit_paths);
+ if (!t)
+ goto fail;
+ strv_free(r);
+ r = t;
+
+ if (generator_late) {
+ t = strv_append(r, generator_late);
+ if (!t)
+ goto fail;
+ strv_free(r);
+ r = t;
+ }
+
+ if (!path_strv_make_absolute_cwd(r))
+ goto fail;
+
+finish:
+ free(config_home);
+ strv_free(config_dirs);
+ free(data_home);
+ strv_free(data_dirs);
+
+ return r;
+
+fail:
+ strv_free(r);
+ r = NULL;
+ goto finish;
+}
+
+int lookup_paths_init(
+ LookupPaths *p,
+ SystemdRunningAs running_as,
+ bool personal,
+ const char *generator,
+ const char *generator_early,
+ const char *generator_late) {
+
+ const char *e;
+ char *t;
+
+ assert(p);
+
+ /* First priority is whatever has been passed to us via env
+ * vars */
+ e = getenv("SYSTEMD_UNIT_PATH");
+ if (e) {
+ p->unit_path = path_split_and_make_absolute(e);
+ if (!p->unit_path)
+ return -ENOMEM;
+ } else
+ p->unit_path = NULL;
+
+ if (strv_isempty(p->unit_path)) {
+ /* Nothing is set, so let's figure something out. */
+ strv_free(p->unit_path);
+
+ /* For the user units we include share/ in the search
+ * path in order to comply with the XDG basedir
+ * spec. For the system stuff we avoid such
+ * nonsense. OTOH we include /lib in the search path
+ * for the system stuff but avoid it for user
+ * stuff. */
+
+ if (running_as == SYSTEMD_USER) {
+
+ if (personal)
+ p->unit_path = user_dirs(generator, generator_early, generator_late);
+ else
+ p->unit_path = strv_new(
+ /* If you modify this you also want to modify
+ * systemduserunitpath= in systemd.pc.in, and
+ * the arrays in user_dirs() above! */
+ STRV_IFNOTNULL(generator_early),
+ USER_CONFIG_UNIT_PATH,
+ "/etc/systemd/user",
+ "/run/systemd/user",
+ STRV_IFNOTNULL(generator),
+ "/usr/local/lib/systemd/user",
+ "/usr/local/share/systemd/user",
+ USER_DATA_UNIT_PATH,
+ "/usr/lib/systemd/user",
+ "/usr/share/systemd/user",
+ STRV_IFNOTNULL(generator_late),
+ NULL);
+
+ if (!p->unit_path)
+ return -ENOMEM;
+
+ } else {
+ p->unit_path = strv_new(
+ /* If you modify this you also want to modify
+ * systemdsystemunitpath= in systemd.pc.in! */
+ STRV_IFNOTNULL(generator_early),
+ SYSTEM_CONFIG_UNIT_PATH,
+ "/etc/systemd/system",
+ "/run/systemd/system",
+ STRV_IFNOTNULL(generator),
+ "/usr/local/lib/systemd/system",
+ SYSTEM_DATA_UNIT_PATH,
+ "/usr/lib/systemd/system",
+#ifdef HAVE_SPLIT_USR
+ "/lib/systemd/system",
+#endif
+ STRV_IFNOTNULL(generator_late),
+ NULL);
+
+ if (!p->unit_path)
+ return -ENOMEM;
+ }
+ }
+
+ if (!path_strv_canonicalize(p->unit_path))
+ return -ENOMEM;
+
+ strv_uniq(p->unit_path);
+ path_strv_remove_empty(p->unit_path);
+
+ if (!strv_isempty(p->unit_path)) {
+
+ t = strv_join(p->unit_path, "\n\t");
+ if (!t)
+ return -ENOMEM;
+ log_debug("Looking for unit files in:\n\t%s", t);
+ free(t);
+ } else {
+ log_debug("Ignoring unit files.");
+ strv_free(p->unit_path);
+ p->unit_path = NULL;
+ }
+
+ if (running_as == SYSTEMD_SYSTEM) {
+#ifdef HAVE_SYSV_COMPAT
+ /* /etc/init.d/ compatibility does not matter to users */
+
+ e = getenv("SYSTEMD_SYSVINIT_PATH");
+ if (e) {
+ p->sysvinit_path = path_split_and_make_absolute(e);
+ if (!p->sysvinit_path)
+ return -ENOMEM;
+ } else
+ p->sysvinit_path = NULL;
+
+ if (strv_isempty(p->sysvinit_path)) {
+ strv_free(p->sysvinit_path);
+
+ p->sysvinit_path = strv_new(
+ SYSTEM_SYSVINIT_PATH, /* /etc/init.d/ */
+ NULL);
+ if (!p->sysvinit_path)
+ return -ENOMEM;
+ }
+
+ e = getenv("SYSTEMD_SYSVRCND_PATH");
+ if (e) {
+ p->sysvrcnd_path = path_split_and_make_absolute(e);
+ if (!p->sysvrcnd_path)
+ return -ENOMEM;
+ } else
+ p->sysvrcnd_path = NULL;
+
+ if (strv_isempty(p->sysvrcnd_path)) {
+ strv_free(p->sysvrcnd_path);
+
+ p->sysvrcnd_path = strv_new(
+ SYSTEM_SYSVRCND_PATH, /* /etc/rcN.d/ */
+ NULL);
+ if (!p->sysvrcnd_path)
+ return -ENOMEM;
+ }
+
+ if (!path_strv_canonicalize(p->sysvinit_path))
+ return -ENOMEM;
+
+ if (!path_strv_canonicalize(p->sysvrcnd_path))
+ return -ENOMEM;
+
+ strv_uniq(p->sysvinit_path);
+ strv_uniq(p->sysvrcnd_path);
+ path_strv_remove_empty(p->sysvinit_path);
+ path_strv_remove_empty(p->sysvrcnd_path);
+
+ if (!strv_isempty(p->sysvinit_path)) {
+
+ t = strv_join(p->sysvinit_path, "\n\t");
+ if (!t)
+ return -ENOMEM;
+ log_debug("Looking for SysV init scripts in:\n\t%s", t);
+ free(t);
+ } else {
+ log_debug("Ignoring SysV init scripts.");
+ strv_free(p->sysvinit_path);
+ p->sysvinit_path = NULL;
+ }
+
+ if (!strv_isempty(p->sysvrcnd_path)) {
+
+ t = strv_join(p->sysvrcnd_path, "\n\t");
+ if (!t)
+ return -ENOMEM;
+
+ log_debug("Looking for SysV rcN.d links in:\n\t%s", t);
+ free(t);
+ } else {
+ log_debug("Ignoring SysV rcN.d links.");
+ strv_free(p->sysvrcnd_path);
+ p->sysvrcnd_path = NULL;
+ }
+#else
+ log_debug("Disabled SysV init scripts and rcN.d links support");
+#endif
+ }
+
+ return 0;
+}
+
+void lookup_paths_free(LookupPaths *p) {
+ assert(p);
+
+ strv_free(p->unit_path);
+ p->unit_path = NULL;
+
+#ifdef HAVE_SYSV_COMPAT
+ strv_free(p->sysvinit_path);
+ strv_free(p->sysvrcnd_path);
+ p->sysvinit_path = p->sysvrcnd_path = NULL;
+#endif
+}
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