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-rw-r--r--src/path-lookup.c269
1 files changed, 269 insertions, 0 deletions
diff --git a/src/path-lookup.c b/src/path-lookup.c
new file mode 100644
index 0000000000..1c4b5dc4e1
--- /dev/null
+++ b/src/path-lookup.c
@@ -0,0 +1,269 @@
+/*-*- Mode: C; c-basic-offset: 8 -*-*/
+
+/***
+ 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 General Public License as published by
+ the Free Software Foundation; either version 2 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
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <assert.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "util.h"
+#include "strv.h"
+
+#include "path-lookup.h"
+
+static char** session_dirs(void) {
+ 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.
+ */
+
+ home = getenv("HOME");
+
+ if ((e = getenv("XDG_CONFIG_HOME"))) {
+ if (asprintf(&config_home, "%s/systemd/session", e) < 0)
+ goto fail;
+
+ } else if (home) {
+ if (asprintf(&config_home, "%s/.config/systemd/session", home) < 0)
+ goto fail;
+ }
+
+ if ((e = getenv("XDG_CONFIG_DIRS")))
+ if (!(config_dirs = strv_split(e, ":")))
+ 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. */
+
+ if ((e = getenv("XDG_DATA_HOME"))) {
+ if (asprintf(&data_home, "%s/systemd/session", e) < 0)
+ goto fail;
+
+ } else if (home) {
+ if (asprintf(&data_home, "%s/.local/share/systemd/session", 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(data_home, 0777);
+ symlink("../../../.config/systemd/session", data_home);
+ }
+
+ if ((e = getenv("XDG_DATA_DIRS")))
+ 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 (config_home) {
+ if (!(t = strv_append(r, config_home)))
+ goto fail;
+ strv_free(r);
+ r = t;
+ }
+
+ if (!(t = strv_merge_concat(r, config_dirs, "/systemd/session")))
+ goto finish;
+ strv_free(r);
+ r = t;
+
+ if (!(t = strv_append(r, SESSION_CONFIG_UNIT_PATH)))
+ goto fail;
+ strv_free(r);
+ r = t;
+
+ if (data_home) {
+ if (!(t = strv_append(r, data_home)))
+ goto fail;
+ strv_free(r);
+ r = t;
+ }
+
+ if (!(t = strv_merge_concat(r, data_dirs, "/systemd/session")))
+ goto fail;
+ strv_free(r);
+ r = t;
+
+ if (!(t = strv_append(r, SESSION_DATA_UNIT_PATH)))
+ goto fail;
+ strv_free(r);
+ r = t;
+
+ if (!strv_path_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, ManagerRunningAs running_as) {
+ const char *e;
+ char *t;
+
+ assert(p);
+
+ /* First priority is whatever has been passed to us via env
+ * vars */
+ if ((e = getenv("SYSTEMD_UNIT_PATH")))
+ if (!(p->unit_path = split_path_and_make_absolute(e)))
+ return -ENOMEM;
+
+ if (strv_isempty(p->unit_path)) {
+
+ /* Nothing is set, so let's figure something out. */
+ strv_free(p->unit_path);
+
+ if (running_as == MANAGER_SESSION) {
+ if (!(p->unit_path = session_dirs()))
+ return -ENOMEM;
+ } else
+ if (!(p->unit_path = strv_new(
+ SYSTEM_CONFIG_UNIT_PATH, /* /etc/systemd/system/ */
+ SYSTEM_DATA_UNIT_PATH, /* /lib/systemd/system/ */
+ NULL)))
+ return -ENOMEM;
+ }
+
+ if (running_as == MANAGER_INIT) {
+ /* /etc/init.d/ compatibility does not matter to users */
+
+ if ((e = getenv("SYSTEMD_SYSVINIT_PATH")))
+ if (!(p->sysvinit_path = split_path_and_make_absolute(e)))
+ return -ENOMEM;
+
+ if (strv_isempty(p->sysvinit_path)) {
+ strv_free(p->sysvinit_path);
+
+ if (!(p->sysvinit_path = strv_new(
+ SYSTEM_SYSVINIT_PATH, /* /etc/init.d/ */
+ NULL)))
+ return -ENOMEM;
+ }
+
+ if ((e = getenv("SYSTEMD_SYSVRCND_PATH")))
+ if (!(p->sysvrcnd_path = split_path_and_make_absolute(e)))
+ return -ENOMEM;
+
+ if (strv_isempty(p->sysvrcnd_path)) {
+ strv_free(p->sysvrcnd_path);
+
+ if (!(p->sysvrcnd_path = strv_new(
+ SYSTEM_SYSVRCND_PATH, /* /etc/rcN.d/ */
+ NULL)))
+ return -ENOMEM;
+ }
+ }
+
+ if (p->unit_path)
+ if (!strv_path_canonicalize(p->unit_path))
+ return -ENOMEM;
+
+ if (p->sysvinit_path)
+ if (!strv_path_canonicalize(p->sysvinit_path))
+ return -ENOMEM;
+
+ if (p->sysvrcnd_path)
+ if (!strv_path_canonicalize(p->sysvrcnd_path))
+ return -ENOMEM;
+
+ strv_uniq(p->unit_path);
+ strv_uniq(p->sysvinit_path);
+ strv_uniq(p->sysvrcnd_path);
+
+ if (!strv_isempty(p->unit_path)) {
+
+ if (!(t = strv_join(p->unit_path, "\n\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 (!strv_isempty(p->sysvinit_path)) {
+
+ if (!(t = strv_join(p->sysvinit_path, "\n\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)) {
+
+ if (!(t = strv_join(p->sysvrcnd_path, "\n\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;
+ }
+
+ return 0;
+}
+
+void lookup_paths_free(LookupPaths *p) {
+ assert(p);
+
+ strv_free(p->unit_path);
+ strv_free(p->sysvinit_path);
+ strv_free(p->sysvrcnd_path);
+
+ p->unit_path = p->sysvinit_path = p->sysvrcnd_path = NULL;
+}
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