stuff

1 files changed, 441 insertions, 0 deletions

diff --git a/src/libshared/path-lookup.c b/src/libshared/path-lookup.c
new file mode 100644
index 0000000000..5410620725
--- /dev/null
+++ b/src/libshared/path-lookup.c
@@ -0,0 +1,441 @@
+/***
+  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);
+}