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-rw-r--r--src/libshared/path-lookup.c441
1 files changed, 441 insertions, 0 deletions
diff --git a/src/libshared/path-lookup.c b/src/libshared/path-lookup.c
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+++ b/src/libshared/path-lookup.c
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+/***
+ 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 <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "alloc-util.h"
+#include "install.h"
+#include "log.h"
+#include "macro.h"
+#include "path-lookup.h"
+#include "path-util.h"
+#include "string-util.h"
+#include "strv.h"
+#include "util.h"
+
+int user_config_home(char **config_home) {
+ const char *e;
+ char *r;
+
+ e = getenv("XDG_CONFIG_HOME");
+ if (e) {
+ r = strappend(e, "/systemd/user");
+ if (!r)
+ return -ENOMEM;
+
+ *config_home = r;
+ return 1;
+ } else {
+ const char *home;
+
+ home = getenv("HOME");
+ if (home) {
+ r = strappend(home, "/.config/systemd/user");
+ if (!r)
+ return -ENOMEM;
+
+ *config_home = r;
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+int user_runtime_dir(char **runtime_dir) {
+ const char *e;
+ char *r;
+
+ e = getenv("XDG_RUNTIME_DIR");
+ if (e) {
+ r = strappend(e, "/systemd/user");
+ if (!r)
+ return -ENOMEM;
+
+ *runtime_dir = r;
+ return 1;
+ }
+
+ return 0;
+}
+
+static int user_data_home_dir(char **dir, const char *suffix) {
+ const char *e;
+ char *res;
+
+ /* 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)
+ res = strappend(e, suffix);
+ else {
+ const char *home;
+
+ home = getenv("HOME");
+ if (home)
+ res = strjoin(home, "/.local/share", suffix, NULL);
+ else
+ return 0;
+ }
+ if (!res)
+ return -ENOMEM;
+
+ *dir = res;
+ 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",
+ NULL
+ };
+
+ const char * const runtime_unit_path = "/run/systemd/user";
+
+ 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 *e;
+ _cleanup_free_ char *config_home = NULL, *runtime_dir = NULL, *data_home = NULL;
+ _cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
+ _cleanup_free_ char **res = NULL;
+ char **tmp;
+ int r;
+
+ /* 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)
+ return NULL;
+
+ if (user_runtime_dir(&runtime_dir) < 0)
+ return NULL;
+
+ e = getenv("XDG_CONFIG_DIRS");
+ if (e) {
+ config_dirs = strv_split(e, ":");
+ if (!config_dirs)
+ return NULL;
+ }
+
+ r = user_data_home_dir(&data_home, "/systemd/user");
+ if (r < 0)
+ return NULL;
+
+ 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)
+ return NULL;
+
+ /* Now merge everything we found. */
+ if (generator_early)
+ if (strv_extend(&res, generator_early) < 0)
+ return NULL;
+
+ if (config_home)
+ if (strv_extend(&res, config_home) < 0)
+ return NULL;
+
+ if (!strv_isempty(config_dirs))
+ if (strv_extend_strv_concat(&res, config_dirs, "/systemd/user") < 0)
+ return NULL;
+
+ if (strv_extend_strv(&res, (char**) config_unit_paths, false) < 0)
+ return NULL;
+
+ if (runtime_dir)
+ if (strv_extend(&res, runtime_dir) < 0)
+ return NULL;
+
+ if (strv_extend(&res, runtime_unit_path) < 0)
+ return NULL;
+
+ if (generator)
+ if (strv_extend(&res, generator) < 0)
+ return NULL;
+
+ if (data_home)
+ if (strv_extend(&res, data_home) < 0)
+ return NULL;
+
+ if (!strv_isempty(data_dirs))
+ if (strv_extend_strv_concat(&res, data_dirs, "/systemd/user") < 0)
+ return NULL;
+
+ if (strv_extend_strv(&res, (char**) data_unit_paths, false) < 0)
+ return NULL;
+
+ if (generator_late)
+ if (strv_extend(&res, generator_late) < 0)
+ return NULL;
+
+ if (path_strv_make_absolute_cwd(res) < 0)
+ return NULL;
+
+ tmp = res;
+ res = NULL;
+ return tmp;
+}
+
+char **generator_paths(ManagerRunningAs running_as) {
+ if (running_as == MANAGER_USER)
+ return strv_new("/run/systemd/user-generators",
+ "/etc/systemd/user-generators",
+ "/usr/local/lib/systemd/user-generators",
+ USER_GENERATOR_PATH,
+ NULL);
+ else
+ return strv_new("/run/systemd/system-generators",
+ "/etc/systemd/system-generators",
+ "/usr/local/lib/systemd/system-generators",
+ SYSTEM_GENERATOR_PATH,
+ NULL);
+}
+
+int lookup_paths_init(
+ LookupPaths *p,
+ ManagerRunningAs running_as,
+ bool personal,
+ const char *root_dir,
+ const char *generator,
+ const char *generator_early,
+ const char *generator_late) {
+
+ const char *e;
+ bool append = false; /* Add items from SYSTEMD_UNIT_PATH before normal directories */
+ int r;
+
+ assert(p);
+
+ /* First priority is whatever has been passed to us via env
+ * vars */
+ e = getenv("SYSTEMD_UNIT_PATH");
+ if (e) {
+ if (endswith(e, ":")) {
+ e = strndupa(e, strlen(e) - 1);
+ append = true;
+ }
+
+ /* FIXME: empty components in other places should be
+ * rejected. */
+
+ r = path_split_and_make_absolute(e, &p->unit_path);
+ if (r < 0)
+ return r;
+ } else
+ p->unit_path = NULL;
+
+ if (!p->unit_path || append) {
+ /* Let's figure something out. */
+
+ _cleanup_strv_free_ char **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 == MANAGER_USER) {
+ if (personal)
+ unit_path = user_dirs(generator, generator_early, generator_late);
+ else
+ 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);
+ } else
+ 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 (!unit_path)
+ return -ENOMEM;
+
+ r = strv_extend_strv(&p->unit_path, unit_path, false);
+ if (r < 0)
+ return r;
+ }
+
+ if (!path_strv_resolve_uniq(p->unit_path, root_dir))
+ return -ENOMEM;
+
+ if (!strv_isempty(p->unit_path)) {
+ _cleanup_free_ char *t = strv_join(p->unit_path, "\n\t");
+ if (!t)
+ return -ENOMEM;
+ log_debug("Looking for unit files in (higher priority first):\n\t%s", t);
+ } else {
+ log_debug("Ignoring unit files.");
+ p->unit_path = strv_free(p->unit_path);
+ }
+
+ if (running_as == MANAGER_SYSTEM) {
+#ifdef HAVE_SYSV_COMPAT
+ /* /etc/init.d/ compatibility does not matter to users */
+
+ e = getenv("SYSTEMD_SYSVINIT_PATH");
+ if (e) {
+ r = path_split_and_make_absolute(e, &p->sysvinit_path);
+ if (r < 0)
+ return r;
+ } 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) {
+ r = path_split_and_make_absolute(e, &p->sysvrcnd_path);
+ if (r < 0)
+ return r;
+ } 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_resolve_uniq(p->sysvinit_path, root_dir))
+ return -ENOMEM;
+
+ if (!path_strv_resolve_uniq(p->sysvrcnd_path, root_dir))
+ return -ENOMEM;
+
+ if (!strv_isempty(p->sysvinit_path)) {
+ _cleanup_free_ char *t = strv_join(p->sysvinit_path, "\n\t");
+ if (!t)
+ return -ENOMEM;
+ log_debug("Looking for SysV init scripts in:\n\t%s", t);
+ } else {
+ log_debug("Ignoring SysV init scripts.");
+ p->sysvinit_path = strv_free(p->sysvinit_path);
+ }
+
+ if (!strv_isempty(p->sysvrcnd_path)) {
+ _cleanup_free_ char *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);
+ } else {
+ log_debug("Ignoring SysV rcN.d links.");
+ p->sysvrcnd_path = strv_free(p->sysvrcnd_path);
+ }
+#else
+ log_debug("SysV init scripts and rcN.d links support disabled");
+#endif
+ }
+
+ return 0;
+}
+
+void lookup_paths_free(LookupPaths *p) {
+ assert(p);
+
+ p->unit_path = strv_free(p->unit_path);
+
+#ifdef HAVE_SYSV_COMPAT
+ p->sysvinit_path = strv_free(p->sysvinit_path);
+ p->sysvrcnd_path = strv_free(p->sysvrcnd_path);
+#endif
+}
+
+int lookup_paths_init_from_scope(LookupPaths *paths,
+ UnitFileScope scope,
+ const char *root_dir) {
+ assert(paths);
+ assert(scope >= 0);
+ assert(scope < _UNIT_FILE_SCOPE_MAX);
+
+ zero(*paths);
+
+ return lookup_paths_init(paths,
+ scope == UNIT_FILE_SYSTEM ? MANAGER_SYSTEM : MANAGER_USER,
+ scope == UNIT_FILE_USER,
+ root_dir,
+ NULL, NULL, NULL);
+}
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