move more common files to shared/ and add them to shared.la

1 files changed, 348 insertions, 0 deletions

diff --git a/src/shared/path-lookup.c b/src/shared/path-lookup.c
new file mode 100644
index 0000000000..1d95f7d1f8
--- /dev/null
+++ b/src/shared/path-lookup.c
@@ -0,0 +1,348 @@
+/*-*- 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 <unistd.h>
+#include <errno.h>
+
+#include "util.h"
+#include "mkdir.h"
+#include "strv.h"
+
+#include "path-lookup.h"
+
+int user_config_home(char **config_home) {
+        const char *e;
+
+        if ((e = getenv("XDG_CONFIG_HOME"))) {
+                if (asprintf(config_home, "%s/systemd/user", e) < 0)
+                        return -ENOMEM;
+
+                return 1;
+        } else {
+                const char *home;
+
+                if ((home = getenv("HOME"))) {
+                        if (asprintf(config_home, "%s/.config/systemd/user", home) < 0)
+                                return -ENOMEM;
+
+                        return 1;
+                }
+        }
+
+        return 0;
+}
+
+static char** user_dirs(void) {
+        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");
+
+        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/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(data_home, 0777);
+                (void) symlink("../../../.config/systemd/user", 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 (!strv_isempty(config_dirs)) {
+                if (!(t = strv_merge_concat(r, config_dirs, "/systemd/user")))
+                        goto finish;
+                strv_free(r);
+                r = t;
+        }
+
+        if (!(t = strv_merge(r, (char**) config_unit_paths)))
+                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 (!strv_isempty(data_dirs)) {
+                if (!(t = strv_merge_concat(r, data_dirs, "/systemd/user")))
+                        goto fail;
+                strv_free(r);
+                r = t;
+        }
+
+        if (!(t = strv_merge(r, (char**) data_unit_paths)))
+                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, bool personal) {
+        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_USER) {
+
+                        if (personal)
+                                p->unit_path = user_dirs();
+                        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! */
+                                                USER_CONFIG_UNIT_PATH,
+                                                "/etc/systemd/user",
+                                                "/run/systemd/user",
+                                                "/usr/local/lib/systemd/user",
+                                                "/usr/local/share/systemd/user",
+                                                USER_DATA_UNIT_PATH,
+                                                "/usr/lib/systemd/user",
+                                                "/usr/share/systemd/user",
+                                                NULL);
+
+                        if (!p->unit_path)
+                                return -ENOMEM;
+
+                } else
+                        if (!(p->unit_path = strv_new(
+                                              /* If you modify this you also want to modify
+                                               * systemdsystemunitpath= in systemd.pc.in! */
+                                              SYSTEM_CONFIG_UNIT_PATH,
+                                              "/etc/systemd/system",
+                                              "/run/systemd/system",
+                                              "/usr/local/lib/systemd/system",
+                                              SYSTEM_DATA_UNIT_PATH,
+                                              "/usr/lib/systemd/system",
+#ifdef HAVE_SPLIT_USR
+                                              "/lib/systemd/system",
+#endif
+                                              NULL)))
+                                return -ENOMEM;
+        }
+
+        if (p->unit_path)
+                if (!strv_path_canonicalize(p->unit_path))
+                        return -ENOMEM;
+
+        strv_uniq(p->unit_path);
+        strv_path_remove_empty(p->unit_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 (running_as == MANAGER_SYSTEM) {
+#ifdef HAVE_SYSV_COMPAT
+                /* /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->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->sysvinit_path);
+                strv_uniq(p->sysvrcnd_path);
+
+                strv_path_remove_empty(p->sysvinit_path);
+                strv_path_remove_empty(p->sysvrcnd_path);
+
+                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;
+                }
+#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
+}