install.c 28.7 KB
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/*-*- 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 <sys/stat.h>
#include <stdio.h>
#include <getopt.h>
#include <errno.h>
#include <unistd.h>

#include "log.h"
#include "path-lookup.h"
#include "util.h"
#include "macro.h"
#include "strv.h"
#include "conf-parser.h"
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#include "dbus-common.h"
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#include "sd-daemon.h"
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static bool arg_force = false;

static enum {
        WHERE_SYSTEM,
        WHERE_SESSION,
        WHERE_GLOBAL,
} arg_where = WHERE_SYSTEM;

static enum {
        ACTION_INVALID,
        ACTION_ENABLE,
        ACTION_DISABLE,
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        ACTION_REALIZE,
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        ACTION_TEST
} arg_action = ACTION_INVALID;

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static enum {
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        REALIZE_NO,        /* Don't reload/start/stop or anything */
        REALIZE_RELOAD,    /* Only reload daemon config, don't stop/start */
        REALIZE_MINIMAL,   /* Only shutdown/restart if running. */
        REALIZE_MAYBE,     /* Start if WantedBy= suggests */
        REALIZE_YES        /* Start unconditionally */
} arg_realize = REALIZE_NO;
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typedef struct {
        char *name;
        char *path;

        char **aliases;
        char **wanted_by;
} InstallInfo;

Hashmap *will_install = NULL, *have_installed = NULL;

static int help(void) {

Lennart Poettering's avatar
Lennart Poettering committed
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        printf("%s [OPTIONS...] {COMMAND} ...\n\n"
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               "Install init system units.\n\n"
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               "  -h --help           Show this help\n"
               "     --force          Override existing links\n"
               "     --system         Install into system\n"
               "     --session        Install into session\n"
               "     --global         Install into all sessions\n"
               "     --realize[=MODE] Start/stop/restart unit after installation\n"
               "                      Takes 'no', 'minimal', 'maybe' or 'yes'\n\n"
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               "Commands:\n"
               "  enable [NAME...]    Enable one or more units\n"
               "  disable [NAME...]   Disable one or more units\n"
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               "  realize [NAME...]   Test whether any of the specified units are enabled\n"
               "                      and the start/stop/restart units accordingly\n"
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               "  test [NAME...]      Test whether any of the specified units are enabled\n",
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               program_invocation_short_name);
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        return 0;
}

static int parse_argv(int argc, char *argv[]) {

        enum {
                ARG_SESSION = 0x100,
                ARG_SYSTEM,
                ARG_GLOBAL,
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                ARG_FORCE,
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                ARG_REALIZE
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        };

        static const struct option options[] = {
                { "help",      no_argument,       NULL, 'h'         },
                { "session",   no_argument,       NULL, ARG_SESSION },
                { "system",    no_argument,       NULL, ARG_SYSTEM  },
                { "global",    no_argument,       NULL, ARG_GLOBAL  },
                { "force",     no_argument,       NULL, ARG_FORCE   },
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                { "realize",   optional_argument, NULL, ARG_REALIZE },
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                { NULL,        0,                 NULL, 0           }
        };

        int c;
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        bool realize_switch = false;
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        assert(argc >= 1);
        assert(argv);

        while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {

                switch (c) {

                case 'h':
                        help();
                        return 0;

                case ARG_SESSION:
                        arg_where = WHERE_SESSION;
                        break;

                case ARG_SYSTEM:
                        arg_where = WHERE_SYSTEM;
                        break;

                case ARG_GLOBAL:
                        arg_where = WHERE_GLOBAL;
                        break;

                case ARG_FORCE:
                        arg_force = true;
                        break;

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                case ARG_REALIZE:
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                        realize_switch = true;

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                        if (!optarg)
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                                arg_realize = REALIZE_MAYBE;
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                        else if (streq(optarg, "no"))
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                                arg_realize = REALIZE_NO;
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                        else if (streq(optarg, "minimal"))
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                                arg_realize = REALIZE_MINIMAL;
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                        else if (streq(optarg, "maybe"))
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                                arg_realize = REALIZE_MAYBE;
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                        else if (streq(optarg, "yes"))
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                                arg_realize = REALIZE_YES;
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                        else if (streq(optarg, "reload"))
                                arg_realize = REALIZE_RELOAD;
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                        else {
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                                log_error("Invalid --realize argument %s", optarg);
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                                return -EINVAL;
                        }

                        break;

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                case '?':
                        return -EINVAL;

                default:
                        log_error("Unknown option code %c", c);
                        return -EINVAL;
                }
        }

        if (optind >= argc) {
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                help();
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                return -EINVAL;
        }

        if (streq(argv[optind], "enable"))
                arg_action = ACTION_ENABLE;
        else if (streq(argv[optind], "disable"))
                arg_action = ACTION_DISABLE;
        else if (streq(argv[optind], "test"))
                arg_action = ACTION_TEST;
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        else if (streq(argv[optind], "realize")) {
                arg_action = ACTION_REALIZE;

                if (!realize_switch)
                        arg_realize = REALIZE_MAYBE;
        } else {
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                log_error("Unknown verb %s.", argv[optind]);
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                return -EINVAL;
        }

        optind++;

        if (optind >= argc) {
                log_error("Missing unit name.");
                return -EINVAL;
        }

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        return 1;
}

static void install_info_free(InstallInfo *i) {
        assert(i);

        free(i->name);
        free(i->path);
        strv_free(i->aliases);
        strv_free(i->wanted_by);
        free(i);
}

static void install_info_hashmap_free(Hashmap *m) {
        InstallInfo *i;

        while ((i = hashmap_steal_first(m)))
                install_info_free(i);

        hashmap_free(m);
}

static bool unit_name_valid(const char *name) {

        /* This is a minimal version of unit_name_valid() from
         * unit-name.c */

        if (!*name)
                return false;

        if (ignore_file(name))
                return false;

        return true;
}

static int install_info_add(const char *name) {
        InstallInfo *i;
        int r;

        if (!unit_name_valid(name))
                return -EINVAL;

        if (hashmap_get(have_installed, name) ||
            hashmap_get(will_install, name))
                return 0;

        if (!(i = new0(InstallInfo, 1))) {
                r = -ENOMEM;
                goto fail;
        }

        if (!(i->name = strdup(name))) {
                r = -ENOMEM;
                goto fail;
        }

        if ((r = hashmap_put(will_install, i->name, i)) < 0)
                goto fail;

        return 0;

fail:
        if (i)
                install_info_free(i);

        return r;
}

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static int daemon_reload(DBusConnection *bus) {
        DBusMessage *m = NULL, *reply = NULL;
        DBusError error;
        int r;

        assert(bus);

        dbus_error_init(&error);

        if (!(m = dbus_message_new_method_call(
                              "org.freedesktop.systemd1",
                              "/org/freedesktop/systemd1",
                              "org.freedesktop.systemd1.Manager",
                              "Reload"))) {
                log_error("Could not allocate message.");
                return -ENOMEM;
        }

        if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
                log_error("Failed to reload configuration: %s", error.message);
                r = -EIO;
                goto finish;
        }

        r = 0;

finish:
        if (m)
                dbus_message_unref(m);

        if (reply)
                dbus_message_unref(reply);

        dbus_error_free(&error);

        return r;
}

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static int install_info_run(DBusConnection *bus, InstallInfo *i, bool enabled) {
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        DBusMessage *m = NULL, *reply = NULL;
        DBusError error;
        int r;
        const char *mode = "replace";

        assert(bus);
        assert(i);

        dbus_error_init(&error);

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        if (arg_action == ACTION_ENABLE ||
            (arg_action == ACTION_REALIZE && enabled)) {
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                if (arg_realize == REALIZE_MAYBE) {
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                        char **k;
                        bool yes_please = false;

                        STRV_FOREACH(k, i->wanted_by) {
                                DBusMessageIter sub, iter;

                                const char *path, *state;
                                const char *interface = "org.freedesktop.systemd1.Unit";
                                const char *property = "ActiveState";

                                if (!(m = dbus_message_new_method_call(
                                                      "org.freedesktop.systemd1",
                                                      "/org/freedesktop/systemd1",
                                                      "org.freedesktop.systemd1.Manager",
                                                      "GetUnit"))) {
                                        log_error("Could not allocate message.");
                                        r = -ENOMEM;
                                        goto finish;
                                }

                                if (!dbus_message_append_args(m,
                                                              DBUS_TYPE_STRING, k,
                                                              DBUS_TYPE_INVALID)) {
                                        log_error("Could not append arguments to message.");
                                        r = -ENOMEM;
                                        goto finish;
                                }

                                if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
                                        /* Hmm, this unit doesn't exist, let's try the next one */
                                        dbus_message_unref(m);
                                        m = NULL;
                                        continue;
                                }

                                if (!dbus_message_get_args(reply, &error,
                                                           DBUS_TYPE_OBJECT_PATH, &path,
                                                           DBUS_TYPE_INVALID)) {
                                        log_error("Failed to parse reply: %s", error.message);
                                        r = -EIO;
                                        goto finish;
                                }

                                dbus_message_unref(m);
                                if (!(m = dbus_message_new_method_call(
                                                      "org.freedesktop.systemd1",
                                                      path,
                                                      "org.freedesktop.DBus.Properties",
                                                      "Get"))) {
                                        log_error("Could not allocate message.");
                                        r = -ENOMEM;
                                        goto finish;
                                }

                                if (!dbus_message_append_args(m,
                                                              DBUS_TYPE_STRING, &interface,
                                                              DBUS_TYPE_STRING, &property,
                                                              DBUS_TYPE_INVALID)) {
                                        log_error("Could not append arguments to message.");
                                        r = -ENOMEM;
                                        goto finish;
                                }

                                dbus_message_unref(reply);
                                if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
                                        log_error("Failed to issue method call: %s", error.message);
                                        r = -EIO;
                                        goto finish;
                                }

                                if (!dbus_message_iter_init(reply, &iter) ||
                                    dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_VARIANT)  {
                                        log_error("Failed to parse reply.");
                                        r = -EIO;
                                        goto finish;
                                }

                                dbus_message_iter_recurse(&iter, &sub);

                                if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_STRING)  {
                                        log_error("Failed to parse reply.");
                                        r = -EIO;
                                        goto finish;
                                }

                                dbus_message_iter_get_basic(&sub, &state);

                                dbus_message_unref(m);
                                dbus_message_unref(reply);
                                m = reply = NULL;

                                if (streq(state, "active") ||
                                    startswith(state, "reloading") ||
                                    startswith(state, "activating")) {
                                        yes_please = true;
                                        break;
                                }
                        }

                        if (!yes_please) {
                                r = 0;
                                goto finish;
                        }
                }

                if (!(m = dbus_message_new_method_call(
                                      "org.freedesktop.systemd1",
                                      "/org/freedesktop/systemd1",
                                      "org.freedesktop.systemd1.Manager",
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                                      arg_realize == REALIZE_MINIMAL ? "TryRestartUnit" : "RestartUnit"))) {
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                        log_error("Could not allocate message.");
                        r = -ENOMEM;
                        goto finish;
                }

                if (!dbus_message_append_args(m,
                                              DBUS_TYPE_STRING, &i->name,
                                              DBUS_TYPE_STRING, &mode,
                                              DBUS_TYPE_INVALID)) {
                        log_error("Could not append arguments to message.");
                        r = -ENOMEM;
                        goto finish;
                }


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        } else if (arg_action == ACTION_DISABLE ||
                   (arg_action == ACTION_REALIZE && !enabled)) {
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                if (!(m = dbus_message_new_method_call(
                                      "org.freedesktop.systemd1",
                                      "/org/freedesktop/systemd1",
                                      "org.freedesktop.systemd1.Manager",
                                      "StopUnit"))) {
                        log_error("Could not allocate message.");
                        r = -ENOMEM;
                        goto finish;
                }

                if (!dbus_message_append_args(m,
                                              DBUS_TYPE_STRING, &i->name,
                                              DBUS_TYPE_STRING, &mode,
                                              DBUS_TYPE_INVALID)) {
                        log_error("Could not append arguments to message.");
                        r = -ENOMEM;
                        goto finish;
                }
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        } else
                assert_not_reached("install_info_run() called but nothing to do?");
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        if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
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                log_error("Failed to realize unit: %s", error.message);
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                r = -EIO;
                goto finish;
        }

        r = 0;

finish:
        if (m)
                dbus_message_unref(m);

        if (reply)
                dbus_message_unref(reply);

        dbus_error_free(&error);

        return r;
}

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static int config_parse_also(
                const char *filename,
                unsigned line,
                const char *section,
                const char *lvalue,
                const char *rvalue,
                void *data,
                void *userdata) {

        char *w;
        size_t l;
        char *state;

        assert(filename);
        assert(lvalue);
        assert(rvalue);

        FOREACH_WORD_QUOTED(w, l, rvalue, state) {
                char *n;
                int r;

                if (!(n = strndup(w, l)))
                        return -ENOMEM;

                r = install_info_add(n);
                free(n);

                if (r < 0)
                        return r;
        }

        return 0;
}

static int create_symlink(const char *old_path, const char *new_path) {
        int r;

        assert(old_path);
        assert(new_path);

        if (arg_action == ACTION_ENABLE) {
                char *dest;

                mkdir_parents(new_path, 0755);

                if (symlink(old_path, new_path) >= 0)
                        return 0;

                if (errno != EEXIST) {
                        log_error("Cannot link %s to %s: %m", old_path, new_path);
                        return -errno;
                }

                if ((r = readlink_and_make_absolute(new_path, &dest)) < 0) {

                        if (errno == EINVAL) {
                                log_error("Cannot link %s to %s, file exists already and is not a symlink.", old_path, new_path);
                                return -EEXIST;
                        }

                        log_error("readlink() failed: %s", strerror(-r));
                        return r;
                }

                if (streq(dest, old_path)) {
                        free(dest);
                        return 0;
                }

                if (!arg_force) {
                        log_error("Cannot link %s to %s, symlink exists already and points to %s.", old_path, new_path, dest);
                        free(dest);
                        return -EEXIST;
                }

                free(dest);
                unlink(new_path);

                if (symlink(old_path, new_path) >= 0)
                        return 0;

                log_error("Cannot link %s to %s: %m", old_path, new_path);
                return -errno;

        } else if (arg_action == ACTION_DISABLE) {
                char *dest;

                if ((r = readlink_and_make_absolute(new_path, &dest)) < 0) {
                        if (errno == ENOENT)
                                return 0;

                        if (errno == EINVAL) {
                                log_warning("File %s not a symlink, ignoring.", old_path);
                                return 0;
                        }

                        log_error("readlink() failed: %s", strerror(-r));
                        return r;
                }

                if (!streq(dest, old_path)) {
                        log_warning("File %s not a symlink to %s but points to %s, ignoring.", new_path, old_path, dest);
                        free(dest);
                        return 0;
                }

                free(dest);
                if (unlink(new_path) >= 0)
                        return 0;

                log_error("Cannot unlink %s: %m", new_path);
                return -errno;

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        } else if (arg_action == ACTION_TEST || arg_action == ACTION_REALIZE) {
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                char *dest;

                if ((r = readlink_and_make_absolute(new_path, &dest)) < 0) {

                        if (errno == ENOENT || errno == EINVAL)
                                return 0;

                        log_error("readlink() failed: %s", strerror(-r));
                        return r;
                }

                if (streq(dest, old_path)) {
                        free(dest);
                        return 1;
                }

                return 0;
        }

        assert_not_reached("Unknown action.");
}

static int install_info_symlink_alias(InstallInfo *i, const char *config_path) {
        char **s;
        char *alias_path = NULL;
        int r;

        assert(i);

        STRV_FOREACH(s, i->aliases) {

                if (!unit_name_valid(*s)) {
                        log_error("Invalid name %s.", *s);
                        r = -EINVAL;
                        goto finish;
                }

                free(alias_path);
                if (!(alias_path = path_make_absolute(*s, config_path))) {
                        log_error("Out of memory");
                        r = -ENOMEM;
                        goto finish;
                }

                if ((r = create_symlink(i->path, alias_path)) != 0)
                        goto finish;
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                if (arg_action == ACTION_DISABLE)
                        rmdir_parents(alias_path, config_path);
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        }

        r = 0;

finish:
        free(alias_path);

        return r;
}

static int install_info_symlink_wants(InstallInfo *i, const char *config_path) {
        char **s;
        char *alias_path = NULL;
        int r;

        assert(i);

        STRV_FOREACH(s, i->wanted_by) {
                if (!unit_name_valid(*s)) {
                        log_error("Invalid name %s.", *s);
                        r = -EINVAL;
                        goto finish;
                }

                free(alias_path);
                alias_path = NULL;

                if (asprintf(&alias_path, "%s/%s.wants/%s", config_path, *s, i->name) < 0) {
                        log_error("Out of memory");
                        r = -ENOMEM;
                        goto finish;
                }

                if ((r = create_symlink(i->path, alias_path)) != 0)
                        goto finish;

694
695
                if (arg_action == ACTION_DISABLE)
                        rmdir_parents(alias_path, config_path);
696
697
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737
738
739
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741
742
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763
764
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766
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773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
        }

        r = 0;

finish:
        free(alias_path);

        return r;
}

static int install_info_apply(LookupPaths *paths, InstallInfo *i, const char *config_path) {

        const ConfigItem items[] = {
                { "Alias",    config_parse_strv, &i->aliases,   "Install" },
                { "WantedBy", config_parse_strv, &i->wanted_by, "Install" },
                { "Also",     config_parse_also, NULL,          "Install" },

                { NULL, NULL, NULL, NULL }
        };

        char **p;
        char *filename = NULL;
        FILE *f = NULL;
        int r;

        assert(paths);
        assert(i);

        STRV_FOREACH(p, paths->unit_path) {

                if (!(filename = path_make_absolute(i->name, *p))) {
                        log_error("Out of memory");
                        return -ENOMEM;
                }

                if ((f = fopen(filename, "re")))
                        break;

                free(filename);
                filename = NULL;

                if (errno != ENOENT) {
                        log_error("Failed to open %s: %m", filename);
                        return -errno;
                }
        }

        if (!f) {
                log_error("Couldn't find %s.", i->name);
                return -ENOENT;
        }

        i->path = filename;

        if ((r = config_parse(filename, f, NULL, items, true, i)) < 0) {
                fclose(f);
                return r;
        }

        fclose(f);

        if ((r = install_info_symlink_alias(i, config_path)) != 0)
                return r;

        if ((r = install_info_symlink_wants(i, config_path)) != 0)
                return r;

        return 0;
}

static char *get_config_path(void) {

        switch (arg_where) {

        case WHERE_SYSTEM:
                return strdup(SYSTEM_CONFIG_UNIT_PATH);

        case WHERE_GLOBAL:
                return strdup(SESSION_CONFIG_UNIT_PATH);

        case WHERE_SESSION: {
                char *p;

                if (session_config_home(&p) < 0)
                        return NULL;

                return p;
        }

        default:
                assert_not_reached("Unknown config path.");
        }
}

790
static int do_realize(bool enabled) {
791
792
793
794
795
796
797
798
        DBusConnection *bus = NULL;
        DBusError error;
        int r, q;
        Iterator i;
        InstallInfo *j;

        dbus_error_init(&error);

799
        if (arg_realize == REALIZE_NO)
800
801
802
                return 0;

        if (arg_where == WHERE_GLOBAL) {
803
                log_warning("Warning: --realize has no effect with --global.");
804
805
806
                return 0;
        }

807
        if (arg_action == ACTION_TEST) {
808
809
810
811
812
813
814
815
816
817
818
                log_warning("Warning: --realize has no effect with test.");
                return 0;
        }

        if (arg_where == WHERE_SYSTEM && sd_booted() <= 0) {
                log_info("systemd is not running, --realize has not effect.");
                return 0;
        }

        if (arg_where == WHERE_SYSTEM && running_in_chroot() > 0) {
                log_info("Running in a chroot() environment, --realize has no effect.");
819
820
821
                return 0;
        }

822
        if ((r = bus_connect(arg_where == WHERE_SESSION ? DBUS_BUS_SESSION : DBUS_BUS_SYSTEM, &bus, NULL, &error)) < 0) {
823
824
825
826
827
828
                log_error("Failed to get D-Bus connection: %s", error.message);
                goto finish;
        }

        r = 0;

829
        if (arg_action == ACTION_ENABLE || arg_action == ACTION_REALIZE)
830
831
832
                if ((r = daemon_reload(bus)) < 0)
                        goto finish;

833
834
        if (arg_realize != REALIZE_RELOAD) {
                HASHMAP_FOREACH(j, have_installed, i)
835
                        if ((q = install_info_run(bus, j, enabled)) < 0)
836
837
                                r = q;
        }
838
839
840
841
842
843

        if (arg_action == ACTION_DISABLE)
                if ((q = daemon_reload(bus)) < 0)
                        r = q;

finish:
844
845
        if (bus) {
                dbus_connection_close(bus);
846
                dbus_connection_unref(bus);
847
        }
848
849
850
851
852
853
854

        dbus_error_free(&error);

        dbus_shutdown();
        return r;
}

855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
int main(int argc, char *argv[]) {
        int r, retval = 1, j;
        LookupPaths paths;
        InstallInfo *i;
        char *config_path = NULL;

        zero(paths);

        log_parse_environment();

        if ((r = parse_argv(argc, argv)) < 0)
                goto finish;
        else if (r == 0) {
                retval = 0;
                goto finish;
        }

872
        if ((r = lookup_paths_init(&paths, arg_where == WHERE_SYSTEM ? MANAGER_SYSTEM : MANAGER_SESSION)) < 0) {
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
                log_error("Failed to determine lookup paths: %s", strerror(-r));
                goto finish;
        }

        if (!(config_path = get_config_path())) {
                log_error("Failed to determine config path");
                goto finish;
        }

        will_install = hashmap_new(string_hash_func, string_compare_func);
        have_installed = hashmap_new(string_hash_func, string_compare_func);

        if (!will_install || !have_installed) {
                log_error("Failed to allocate unit sets.");
                goto finish;
        }

        for (j = optind; j < argc; j++)
                if ((r = install_info_add(argv[j])) < 0)
                        goto finish;

        while ((i = hashmap_first(will_install))) {
                assert_se(hashmap_move_one(have_installed, will_install, i->name) == 0);

                if ((r = install_info_apply(&paths, i, config_path)) != 0) {

                        if (r < 0)
                                goto finish;

                        /* In test mode and found something */
                        retval = 0;
904
                        break;
905
906
907
                }
        }

908
        if (do_realize(!retval) < 0)
909
910
                goto finish;

911
912
913
914
915
916
917
918
919
920
finish:
        install_info_hashmap_free(will_install);
        install_info_hashmap_free(have_installed);

        lookup_paths_free(&paths);

        free(config_path);

        return retval;
}