install: add new installer implementation

This new installer will replace the current code of "systemctl enable"
but also be available via D-Bus. It adds a couple of new features:

- Mask/Unmask calls
- Reenable call
- Preset call
- Support for enabling units temporarily (i.e. in /run/systemd instead
  of /etc/systemd)
- Enumeration of installed units
- Support for out-of-search-path units

systemctl and D-Bus are not hooked up with this yet

1 files changed, 1944 insertions, 0 deletions

diff --git a/src/install.c b/src/install.c
new file mode 100644
index 0000000000..e1c69444f9
--- /dev/null
+++ b/src/install.c
@@ -0,0 +1,1944 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2011 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 <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+#include <fnmatch.h>
+
+#include "util.h"
+#include "hashmap.h"
+#include "set.h"
+#include "path-lookup.h"
+#include "strv.h"
+#include "unit-name.h"
+#include "install.h"
+#include "conf-parser.h"
+
+typedef struct {
+        char *name;
+        char *path;
+
+        char **aliases;
+        char **wanted_by;
+} InstallInfo;
+
+typedef struct {
+        Hashmap *will_install;
+        Hashmap *have_installed;
+} InstallContext;
+
+static int lookup_paths_init_from_scope(LookupPaths *paths, UnitFileScope scope) {
+        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);
+}
+
+static int get_config_path(UnitFileScope scope, bool runtime, const char *root_dir, char **ret) {
+        char *p = NULL;
+        int r;
+
+        assert(scope >= 0);
+        assert(scope < _UNIT_FILE_SCOPE_MAX);
+        assert(ret);
+
+        switch (scope) {
+
+        case UNIT_FILE_SYSTEM:
+
+                if (root_dir && runtime)
+                        return -EINVAL;
+
+                if (runtime)
+                        p = strdup("/run/systemd/system");
+                else if (root_dir)
+                        asprintf(&p, "%s/%s", root_dir, SYSTEM_CONFIG_UNIT_PATH);
+                else
+                        p = strdup(SYSTEM_CONFIG_UNIT_PATH);
+
+                break;
+
+        case UNIT_FILE_GLOBAL:
+
+                if (root_dir)
+                        return -EINVAL;
+
+                if (runtime)
+                        p = strdup("/run/systemd/user");
+                else
+                        p = strdup(USER_CONFIG_UNIT_PATH);
+                break;
+
+        case UNIT_FILE_USER:
+
+                if (root_dir || runtime)
+                        return -EINVAL;
+
+                r = user_config_home(&p);
+                if (r <= 0)
+                        return r < 0 ? r : -ENOENT;
+
+                break;
+
+        default:
+                assert_not_reached("Bad scope");
+        }
+
+        if (!p)
+                return -ENOMEM;
+
+        *ret = p;
+        return 0;
+}
+
+static int add_file_change(
+                UnitFileChange **changes,
+                unsigned *n_changes,
+                UnitFileChangeType type,
+                const char *path,
+                const char *source) {
+
+        UnitFileChange *c;
+        unsigned i;
+
+        assert(type >= 0);
+        assert(type < _UNIT_FILE_CHANGE_TYPE_MAX);
+        assert(path);
+        assert(!changes == !n_changes);
+
+        if (!changes)
+                return 0;
+
+        c = realloc(*changes, (*n_changes + 1) * sizeof(UnitFileChange));
+        if (!c)
+                return -ENOMEM;
+
+        *changes = c;
+        i = *n_changes;
+
+        c[i].type = type;
+        c[i].path = strdup(path);
+        if (!c[i].path)
+                return -ENOMEM;
+
+        if (source) {
+                c[i].source = strdup(source);
+                if (!c[i].source) {
+                        free(c[i].path);
+                        return -ENOMEM;
+                }
+        } else
+                c[i].source = NULL;
+
+        *n_changes = i+1;
+        return 0;
+}
+
+static int mark_symlink_for_removal(
+                Set **remove_symlinks_to,
+                const char *p) {
+
+        char *n;
+        int r;
+
+        assert(p);
+
+        r = set_ensure_allocated(remove_symlinks_to, string_hash_func, string_compare_func);
+        if (r < 0)
+                return r;
+
+        n = strdup(p);
+        if (!n)
+                return -ENOMEM;
+
+        path_kill_slashes(n);
+
+        r = set_put(*remove_symlinks_to, n);
+        if (r < 0) {
+                free(n);
+                return r == -EEXIST ? 0 : r;
+        }
+
+        return 0;
+}
+
+static int remove_marked_symlinks_fd(
+                Set *remove_symlinks_to,
+                int fd,
+                const char *path,
+                const char *config_path,
+                bool *deleted,
+                UnitFileChange **changes,
+                unsigned *n_changes) {
+
+        int r = 0;
+        DIR *d;
+        struct dirent buffer, *de;
+
+        assert(remove_symlinks_to);
+        assert(fd >= 0);
+        assert(path);
+        assert(config_path);
+        assert(deleted);
+
+        d = fdopendir(fd);
+        if (!d) {
+                close_nointr_nofail(fd);
+                return -errno;
+        }
+
+        rewinddir(d);
+
+        for (;;) {
+                int k;
+
+                k = readdir_r(d, &buffer, &de);
+                if (k != 0) {
+                        r = -errno;
+                        break;
+                }
+
+                if (!de)
+                        break;
+
+                if (ignore_file(de->d_name))
+                        continue;
+
+                dirent_ensure_type(d, de);
+
+                if (de->d_type == DT_DIR) {
+                        int nfd, q;
+                        char *p;
+
+                        nfd = openat(fd, de->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW);
+                        if (nfd < 0) {
+                                if (errno == ENOENT)
+                                        continue;
+
+                                if (r == 0)
+                                        r = -errno;
+                                continue;
+                        }
+
+                        p = path_make_absolute(de->d_name, path);
+                        if (!p) {
+                                close_nointr_nofail(nfd);
+                                r = -ENOMEM;
+                                break;
+                        }
+
+                        /* This will close nfd, regardless whether it succeeds or not */
+                        q = remove_marked_symlinks_fd(remove_symlinks_to, nfd, p, config_path, deleted, changes, n_changes);
+                        free(p);
+
+                        if (r == 0)
+                                r = q;
+
+                } else if (de->d_type == DT_LNK) {
+                        char *p, *dest;
+                        int q;
+                        bool found;
+
+                        p = path_make_absolute(de->d_name, path);
+                        if (!p) {
+                                r = -ENOMEM;
+                                break;
+                        }
+
+                        q = readlink_and_canonicalize(p, &dest);
+                        if (q < 0) {
+                                free(p);
+
+                                if (q == -ENOENT)
+                                        continue;
+
+                                if (r == 0)
+                                        r = q;
+                                continue;
+                        }
+
+                        found =
+                                set_get(remove_symlinks_to, dest) ||
+                                set_get(remove_symlinks_to, file_name_from_path(dest));
+
+                        if (found) {
+
+                                if (unlink(p) < 0 && errno != ENOENT) {
+
+                                        if (r == 0)
+                                                r = -errno;
+                                } else {
+                                        rmdir_parents(p, config_path);
+                                        path_kill_slashes(p);
+
+                                        add_file_change(changes, n_changes, UNIT_FILE_UNLINK, p, NULL);
+
+                                        if (!set_get(remove_symlinks_to, p)) {
+
+                                                q = mark_symlink_for_removal(&remove_symlinks_to, p);
+                                                if (q < 0) {
+                                                        if (r == 0)
+                                                                r = q;
+                                                } else
+                                                        *deleted = true;
+                                        }
+                                }
+                        }
+
+                        free(p);
+                        free(dest);
+                }
+        }
+
+        closedir(d);
+
+        return r;
+}
+
+static int remove_marked_symlinks(
+                Set *remove_symlinks_to,
+                const char *config_path,
+                UnitFileChange **changes,
+                unsigned *n_changes) {
+
+        int fd, r = 0;
+        bool deleted;
+
+        assert(config_path);
+
+        if (set_size(remove_symlinks_to) <= 0)
+                return 0;
+
+        fd = open(config_path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW);
+        if (fd < 0)
+                return -errno;
+
+        do {
+                int q, cfd;
+                deleted = false;
+
+                cfd = dup(fd);
+                if (cfd < 0) {
+                        r = -errno;
+                        break;
+                }
+
+                /* This takes possession of cfd and closes it */
+                q = remove_marked_symlinks_fd(remove_symlinks_to, cfd, config_path, config_path, &deleted, changes, n_changes);
+                if (r == 0)
+                        r = q;
+        } while (deleted);
+
+        close_nointr_nofail(fd);
+
+        return r;
+}
+
+static int find_symlinks_fd(
+                const char *name,
+                int fd,
+                const char *path,
+                const char *config_path,
+                bool *same_name_link) {
+
+        int r = 0;
+        DIR *d;
+        struct dirent buffer, *de;
+
+        assert(name);
+        assert(fd >= 0);
+        assert(path);
+        assert(config_path);
+        assert(same_name_link);
+
+        d = fdopendir(fd);
+        if (!d) {
+                close_nointr_nofail(fd);
+                return -errno;
+        }
+
+        for (;;) {
+                int k;
+
+                k = readdir_r(d, &buffer, &de);
+                if (k != 0) {
+                        r = -errno;
+                        break;
+                }
+
+                if (!de)
+                        break;
+
+                if (ignore_file(de->d_name))
+                        continue;
+
+                dirent_ensure_type(d, de);
+
+                if (de->d_type == DT_DIR) {
+                        int nfd, q;
+                        char *p;
+
+                        nfd = openat(fd, de->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW);
+                        if (nfd < 0) {
+                                if (errno == ENOENT)
+                                        continue;
+
+                                if (r == 0)
+                                        r = -errno;
+                                continue;
+                        }
+
+                        p = path_make_absolute(de->d_name, path);
+                        if (!p) {
+                                close_nointr_nofail(nfd);
+                                r = -ENOMEM;
+                                break;
+                        }
+
+                        /* This will close nfd, regardless whether it succeeds or not */
+                        q = find_symlinks_fd(name, nfd, p, config_path, same_name_link);
+                        free(p);
+
+                        if (q > 0) {
+                                r = 1;
+                                break;
+                        }
+
+                        if (r == 0)
+                                r = q;
+
+                } else if (de->d_type == DT_LNK) {
+                        char *p, *dest;
+                        bool found_path, found_dest, b = false;
+                        int q;
+
+                        /* Acquire symlink name */
+                        p = path_make_absolute(de->d_name, path);
+                        if (!p) {
+                                r = -ENOMEM;
+                                break;
+                        }
+
+                        /* Acquire symlink destination */
+                        q = readlink_and_canonicalize(p, &dest);
+                        if (q < 0) {
+                                free(p);
+
+                                if (q == -ENOENT)
+                                        continue;
+
+                                if (r == 0)
+                                        r = q;
+                                continue;
+                        }
+
+                        /* Check if the symlink itself matches what we
+                         * are looking for */
+                        if (path_is_absolute(name))
+                                found_path = path_equal(p, name);
+                        else
+                                found_path = streq(de->d_name, name);
+
+                        /* Check if what the symlink points to
+                         * matches what we are looking for */
+                        if (path_is_absolute(name))
+                                found_dest = path_equal(dest, name);
+                        else
+                                found_dest = streq(file_name_from_path(dest), name);
+
+                        free(dest);
+
+                        if (found_path && found_dest) {
+                                char *t;
+
+                                /* Filter out same name links in the main
+                                 * config path */
+                                t = path_make_absolute(name, config_path);
+                                if (!t) {
+                                        free(p);
+                                        free(dest);
+                                        r = -ENOMEM;
+                                        break;
+                                }
+
+                                b = path_equal(t, p);
+                                free(t);
+                        }
+
+                        free(p);
+
+                        if (b)
+                                *same_name_link = true;
+                        else if (found_path || found_dest) {
+                                r = 1;
+                                break;
+                        }
+                }
+        }
+
+        closedir(d);
+
+        return r;
+}
+
+static int find_symlinks(
+                const char *name,
+                const char *config_path,
+                bool *same_name_link) {
+
+        int fd;
+
+        assert(name);
+        assert(config_path);
+        assert(same_name_link);
+
+        fd = open(config_path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW);
+        if (fd < 0)
+                return -errno;
+
+        /* This takes possession of fd and closes it */
+        return find_symlinks_fd(name, fd, config_path, config_path, same_name_link);
+}
+
+static int find_symlinks_in_scope(
+                UnitFileScope scope,
+                const char *root_dir,
+                const char *name,
+                UnitFileState *state) {
+
+        int r;
+        char *path;
+        bool same_name_link_runtime = false, same_name_link = false;
+
+        assert(scope >= 0);
+        assert(scope < _UNIT_FILE_SCOPE_MAX);
+        assert(name);
+
+        if (scope == UNIT_FILE_SYSTEM || scope == UNIT_FILE_GLOBAL) {
+
+                /* First look in runtime config path */
+                r = get_config_path(scope, true, root_dir, &path);
+                if (r < 0)
+                        return r;
+
+                r = find_symlinks(name, path, &same_name_link_runtime);
+                free(path);
+
+                if (r < 0)
+                        return r;
+                else if (r > 0) {
+                        *state = UNIT_FILE_ENABLED_RUNTIME;
+                        return r;
+                }
+        }
+
+        /* Then look in the normal config path */
+        r = get_config_path(scope, false, root_dir, &path);
+        if (r < 0)
+                return r;
+
+        r = find_symlinks(name, path, &same_name_link);
+        free(path);
+
+        if (r < 0)
+                return r;
+        else if (r > 0) {
+                *state = UNIT_FILE_ENABLED;
+                return r;
+        }
+
+        /* Hmm, we didn't find it, but maybe we found the same name
+         * link? */
+        if (same_name_link_runtime) {
+                *state = UNIT_FILE_LINKED_RUNTIME;
+                return 1;
+        } else if (same_name_link) {
+                *state = UNIT_FILE_LINKED;
+                return 1;
+        }
+
+        return 0;
+}
+
+int unit_file_mask(
+                UnitFileScope scope,
+                bool runtime,
+                const char *root_dir,
+                char *files[],
+                bool force,
+                UnitFileChange **changes,
+                unsigned *n_changes) {
+
+        char **i, *prefix;
+        int r;
+
+        assert(scope >= 0);
+        assert(scope < _UNIT_FILE_SCOPE_MAX);
+
+        r = get_config_path(scope, runtime, root_dir, &prefix);
+        if (r < 0)
+                return r;
+
+        STRV_FOREACH(i, files) {
+                char *path;
+
+                if (!unit_name_is_valid_no_type(*i, true)) {
+                        if (r == 0)
+                                r = -EINVAL;
+                        continue;
+                }
+
+                path = path_make_absolute(*i, prefix);
+                if (!path) {
+                        r = -ENOMEM;
+                        break;
+                }
+
+                if (symlink("/dev/null", path) >= 0) {
+                        add_file_change(changes, n_changes, UNIT_FILE_SYMLINK, path, "/dev/null");
+
+                        free(path);
+                        continue;
+                }
+
+                if (errno == EEXIST) {
+
+                        if (null_or_empty_path(path) > 0) {
+                                free(path);
+                                continue;
+                        }
+
+                        if (force) {
+                                unlink(path);
+
+                                if (symlink("/dev/null", path) >= 0) {
+
+                                        add_file_change(changes, n_changes, UNIT_FILE_UNLINK, path, NULL);
+                                        add_file_change(changes, n_changes, UNIT_FILE_SYMLINK, path, "/dev/null");
+
+                                        free(path);
+                                        continue;
+                                }
+                        }
+
+                        if (r == 0)
+                                r = -EEXIST;
+                } else {
+                        if (r == 0)
+                                r = -errno;
+                }
+
+                free(path);
+        }
+
+        free(prefix);
+
+        return r;
+}
+
+int unit_file_unmask(
+                UnitFileScope scope,
+                bool runtime,
+                const char *root_dir,
+                char *files[],
+                UnitFileChange **changes,
+                unsigned *n_changes) {
+
+        char **i, *config_path = NULL;
+        int r, q;
+        Set *remove_symlinks_to = NULL;
+
+        assert(scope >= 0);
+        assert(scope < _UNIT_FILE_SCOPE_MAX);
+
+        r = get_config_path(scope, runtime, root_dir, &config_path);
+        if (r < 0)
+                goto finish;
+
+        STRV_FOREACH(i, files) {
+                char *path;
+
+                if (!unit_name_is_valid_no_type(*i, true)) {
+                        if (r == 0)
+                                r = -EINVAL;
+                        continue;
+                }
+
+                path = path_make_absolute(*i, config_path);
+                if (!path) {
+                        r = -ENOMEM;
+                        break;
+                }
+
+                q = null_or_empty_path(path);
+                if (q > 0) {
+                        if (unlink(path) >= 0) {
+                                mark_symlink_for_removal(&remove_symlinks_to, path);
+                                add_file_change(changes, n_changes, UNIT_FILE_UNLINK, path, NULL);
+
+                                free(path);
+                                continue;
+                        }
+
+                        q = -errno;
+                }
+
+                if (q != -ENOENT && r == 0)
+                        r = q;
+
+                free(path);
+        }
+
+
+finish:
+        q = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes);
+        if (r == 0)
+                r = q;
+
+        set_free_free(remove_symlinks_to);
+        free(config_path);
+
+        return r;
+}
+
+int unit_file_link(
+                UnitFileScope scope,
+                bool runtime,
+                const char *root_dir,
+                char *files[],
+                bool force,
+                UnitFileChange **changes,
+                unsigned *n_changes) {
+
+        LookupPaths paths;
+        char **i, *config_path = NULL;
+        int r, q;
+
+        assert(scope >= 0);
+        assert(scope < _UNIT_FILE_SCOPE_MAX);
+
+        zero(paths);
+
+        r = lookup_paths_init_from_scope(&paths, scope);
+        if (r < 0)
+                return r;
+
+        r = get_config_path(scope, runtime, root_dir, &config_path);
+        if (r < 0)
+                goto finish;
+
+        STRV_FOREACH(i, files) {
+                char *path, *fn;
+                struct stat st;
+
+                fn = file_name_from_path(*i);
+
+                if (!path_is_absolute(*i) ||
+                    !unit_name_is_valid_no_type(fn, true)) {
+                        if (r == 0)
+                                r = -EINVAL;
+                        continue;
+                }
+
+                if (lstat(*i, &st) < 0) {
+                        if (r == 0)
+                                r = -errno;
+                        continue;
+                }
+
+                if (!S_ISREG(st.st_mode)) {
+                        r = -ENOENT;
+                        continue;
+                }
+
+                q = in_search_path(*i, paths.unit_path);
+                if (q < 0) {
+                        r = q;
+                        break;
+                }
+
+                if (q > 0)
+                        continue;
+
+                path = path_make_absolute(fn, config_path);
+                if (!path) {
+                        r = -ENOMEM;
+                        break;
+                }
+
+                if (symlink(*i, path) >= 0) {
+                        add_file_change(changes, n_changes, UNIT_FILE_SYMLINK, path, *i);
+
+                        free(path);
+                        continue;
+                }
+
+                if (errno == EEXIST) {
+                        char *dest = NULL;
+
+                        q = readlink_and_make_absolute(path, &dest);
+
+                        if (q < 0 && errno != ENOENT) {
+                                free(path);
+
+                                if (r == 0)
+                                        r = q;
+
+                                continue;
+                        }
+
+                        if (q >= 0 && path_equal(dest, *i)) {
+                                free(dest);
+                                free(path);
+                                continue;
+                        }
+
+                        free(dest);
+
+                        if (force) {
+                                unlink(path);
+
+                                if (symlink(*i, path) >= 0) {
+
+                                        add_file_change(changes, n_changes, UNIT_FILE_UNLINK, path, NULL);
+                                        add_file_change(changes, n_changes, UNIT_FILE_SYMLINK, path, *i);
+
+                                        free(path);
+                                        continue;
+                                }
+                        }
+
+                        if (r == 0)
+                                r = -EEXIST;
+                } else {
+                        if (r == 0)
+                                r = -errno;
+                }
+
+                free(path);
+        }
+
+                finish:
+        lookup_paths_free(&paths);
+        free(config_path);
+
+        return r;
+}
+
+void unit_file_list_free(Hashmap *h) {
+        UnitFileList *i;
+
+        while ((i = hashmap_steal_first(h))) {
+                free(i->path);
+                free(i);
+        }
+
+        hashmap_free(h);
+}
+
+void unit_file_changes_free(UnitFileChange *changes, unsigned n_changes) {
+        unsigned i;
+
+        assert(changes || n_changes == 0);
+
+        if (!changes)
+                return;
+
+        for (i = 0; i < n_changes; i++) {
+                free(changes[i].path);
+                free(changes[i].source);
+        }
+
+        free(changes);
+}
+
+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;
+
+        if (!m)
+                return;
+
+        while ((i = hashmap_steal_first(m)))
+                install_info_free(i);
+
+        hashmap_free(m);
+}
+
+static void install_context_done(InstallContext *c) {
+        assert(c);
+
+        install_info_hashmap_free(c->will_install);
+        install_info_hashmap_free(c->have_installed);
+
+        c->will_install = c->have_installed = NULL;
+}
+
+static int install_info_add(
+                InstallContext *c,
+                const char *name,
+                const char *path) {
+        InstallInfo *i = NULL;
+        int r;
+
+        assert(c);
+        assert(name || path);
+
+        if (!name)
+                name = file_name_from_path(path);
+
+        if (!unit_name_is_valid_no_type(name, true))
+                return -EINVAL;
+
+        if (hashmap_get(c->have_installed, name) ||
+            hashmap_get(c->will_install, name))
+                return 0;
+
+        r = hashmap_ensure_allocated(&c->will_install, string_hash_func, string_compare_func);
+        if (r < 0)
+                return r;
+
+        i = new0(InstallInfo, 1);
+        if (!i)
+                return -ENOMEM;
+
+        i->name = strdup(name);
+        if (!i->name) {
+                r = -ENOMEM;
+                goto fail;
+        }
+
+        if (path) {
+                i->path = strdup(path);
+                if (!i->path) {
+                        r = -ENOMEM;
+                        goto fail;
+                }
+        }
+
+        r = hashmap_put(c->will_install, i->name, i);
+        if (r < 0)
+                goto fail;
+
+        return 0;
+
+fail:
+        if (i)
+                install_info_free(i);
+
+        return r;
+}
+
+static int install_info_add_auto(
+                InstallContext *c,
+                const char *name_or_path) {
+
+        assert(c);
+        assert(name_or_path);
+
+        if (path_is_absolute(name_or_path))
+                return install_info_add(c, NULL, name_or_path);
+        else
+                return install_info_add(c, name_or_path, NULL);
+}
+
+static int config_parse_also(
+                const char *filename,
+                unsigned line,
+                const char *section,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+
+        char *w;
+        size_t l;
+        char *state;
+        InstallContext *c = data;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+
+        FOREACH_WORD_QUOTED(w, l, rvalue, state) {
+                char *n;
+                int r;
+
+                n = strndup(w, l);
+                if (!n)
+                        return -ENOMEM;
+
+                r = install_info_add(c, n, NULL);
+                if (r < 0) {
+                        free(n);
+                        return r;
+                }
+
+                free(n);
+        }
+
+        return 0;
+}
+
+static int unit_file_load(
+                InstallContext *c,
+                InstallInfo *info,
+                const char *path,
+                bool allow_symlink) {
+
+        const ConfigItem items[] = {
+                { "Alias",    config_parse_strv, 0, &info->aliases,   "Install" },
+                { "WantedBy", config_parse_strv, 0, &info->wanted_by, "Install" },
+                { "Also",     config_parse_also, 0, c,                "Install" },
+                { NULL, NULL, 0, NULL, NULL }
+        };
+
+        int fd;
+        FILE *f;
+        int r;
+
+        assert(c);
+        assert(info);
+        assert(path);
+
+        fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|(allow_symlink ? 0 : O_NOFOLLOW));
+        if (fd < 0)
+                return -errno;
+
+        f = fdopen(fd, "re");
+        if (!f) {
+                close_nointr_nofail(fd);
+                return -ENOMEM;
+        }
+
+        r = config_parse(path, f, NULL, items, true, info);
+        fclose(f);
+        if (r < 0)
+                return r;
+
+        return strv_length(info->aliases) + strv_length(info->wanted_by);
+}
+
+static int unit_file_search(
+                InstallContext *c,
+                InstallInfo *info,
+                LookupPaths *paths,
+                const char *root_dir,
+                bool allow_symlink) {
+
+        char **p;
+        int r;
+
+        assert(c);
+        assert(info);
+        assert(paths);
+
+        if (info->path)
+                return unit_file_load(c, info, info->path, allow_symlink);
+
+        assert(info->name);
+
+        STRV_FOREACH(p, paths->unit_path) {
+                char *path = NULL;
+
+                if (isempty(root_dir))
+                        asprintf(&path, "%s/%s", *p, info->name);
+                else
+                        asprintf(&path, "%s/%s/%s", root_dir, *p, info->name);
+
+                if (!path)
+                        return -ENOMEM;
+
+                r = unit_file_load(c, info, path, allow_symlink);
+
+                if (r >= 0)
+                        info->path = path;
+                else
+                        free(path);
+
+                if (r != -ENOENT && r != -ELOOP)
+                        return r;
+        }
+
+        return -ENOENT;
+}
+
+static int unit_file_can_install(
+                LookupPaths *paths,
+                const char *root_dir,
+                const char *name,
+                bool allow_symlink) {
+
+        InstallContext c;
+        InstallInfo *i;
+        int r;
+
+        assert(paths);
+        assert(name);
+
+        zero(c);
+
+        r = install_info_add_auto(&c, name);
+        if (r < 0)
+                return r;
+
+        assert_se(i = hashmap_first(c.will_install));
+
+        r = unit_file_search(&c, i, paths, root_dir, allow_symlink);
+
+        if (r >= 0)
+                r = strv_length(i->aliases) + strv_length(i->wanted_by);
+
+        install_context_done(&c);
+
+        return r;
+}
+
+static int create_symlink(
+                const char *old_path,
+                const char *new_path,
+                bool force,
+                UnitFileChange **changes,
+                unsigned *n_changes) {
+
+        char *dest;
+        int r;
+
+        assert(old_path);
+        assert(new_path);
+
+        mkdir_parents(new_path, 0755);
+
+        if (symlink(old_path, new_path) >= 0) {
+                add_file_change(changes, n_changes, UNIT_FILE_SYMLINK, new_path, old_path);
+                return 0;
+        }
+
+        if (errno != EEXIST)
+                return -errno;
+
+        r = readlink_and_make_absolute(new_path, &dest);
+        if (r < 0)
+                return r;
+
+        if (path_equal(dest, old_path)) {
+                free(dest);
+                return 0;
+        }
+
+        free(dest);
+
+        if (force)
+                return -EEXIST;
+
+        unlink(new_path);
+
+        if (symlink(old_path, new_path) >= 0) {
+                add_file_change(changes, n_changes, UNIT_FILE_UNLINK, new_path, NULL);
+                add_file_change(changes, n_changes, UNIT_FILE_SYMLINK, new_path, old_path);
+                return 0;
+        }
+
+        return -errno;
+}
+
+static int install_info_symlink_alias(
+                InstallInfo *i,
+                const char *config_path,
+                bool force,
+                UnitFileChange **changes,
+                unsigned *n_changes) {
+
+        char **s;
+        int r = 0, q;
+
+        assert(i);
+        assert(config_path);
+
+        STRV_FOREACH(s, i->aliases) {
+                char *alias_path;
+
+                alias_path = path_make_absolute(*s, config_path);
+
+                if (!alias_path)
+                        return -ENOMEM;
+
+                q = create_symlink(i->path, alias_path, force, changes, n_changes);
+                free(alias_path);
+
+                if (r == 0)
+                        r = q;
+        }
+
+        return r;
+}
+
+static int install_info_symlink_wants(
+                InstallInfo *i,
+                const char *config_path,
+                bool force,
+                UnitFileChange **changes,
+                unsigned *n_changes) {
+
+        char **s;
+        int r = 0, q;
+
+        assert(i);
+        assert(config_path);
+
+        STRV_FOREACH(s, i->wanted_by) {
+                char *path;
+
+                if (!unit_name_is_valid_no_type(*s, true)) {
+                        r = -EINVAL;
+                        continue;
+                }
+
+                if (asprintf(&path, "%s/%s.wants/%s", config_path, *s, i->name) < 0)
+                        return -ENOMEM;
+
+                q = create_symlink(i->path, path, force, changes, n_changes);
+                free(path);
+
+                if (r == 0)
+                        r = q;
+        }
+
+        return r;
+}
+
+static int install_info_symlink_link(
+                InstallInfo *i,
+                LookupPaths *paths,
+                const char *config_path,
+                bool force,
+                UnitFileChange **changes,
+                unsigned *n_changes) {
+
+        int r;
+        char *path;
+
+        assert(i);
+        assert(paths);
+        assert(config_path);
+        assert(i->path);
+
+        r = in_search_path(i->path, paths->unit_path);
+        if (r != 0)
+                return r;
+
+        if (asprintf(&path, "%s/%s", config_path, i->name) < 0)
+                return -ENOMEM;
+
+        r = create_symlink(i->path, path, force, changes, n_changes);
+        free(path);
+
+        return r;
+}
+
+static int install_info_apply(
+                InstallInfo *i,
+                LookupPaths *paths,
+                const char *config_path,
+                bool force,
+                UnitFileChange **changes,
+                unsigned *n_changes) {
+
+        int r, q;
+
+        assert(i);
+        assert(paths);
+        assert(config_path);
+
+        r = install_info_symlink_alias(i, config_path, force, changes, n_changes);
+
+        q = install_info_symlink_wants(i, config_path, force, changes, n_changes);
+        if (r == 0)
+                r = q;
+
+        q = install_info_symlink_link(i, paths, config_path, force, changes, n_changes);
+        if (r == 0)
+                r = q;
+
+        return r;
+}
+
+static int install_context_apply(
+                InstallContext *c,
+                LookupPaths *paths,
+                const char *config_path,
+                const char *root_dir,
+                bool force,
+                UnitFileChange **changes,
+                unsigned *n_changes) {
+
+        InstallInfo *i;
+        int r = 0, q;
+
+        assert(c);
+        assert(paths);
+        assert(config_path);
+
+        while ((i = hashmap_first(c->will_install))) {
+
+                q = hashmap_ensure_allocated(&c->have_installed, string_hash_func, string_compare_func);
+                if (q < 0)
+                        return q;
+
+                assert_se(hashmap_move_one(c->have_installed, c->will_install, i->name) == 0);
+
+                q = unit_file_search(c, i, paths, root_dir, false);
+                if (q < 0) {
+                        if (r >= 0)
+                                r = q;
+
+                        return r;
+                } else if (r >= 0)
+                        r += q;
+
+                q = install_info_apply(i, paths, config_path, force, changes, n_changes);
+                if (r >= 0 && q < 0)
+                        r = q;
+        }
+
+        return r;
+}
+
+static int install_context_mark_for_removal(
+                InstallContext *c,
+                LookupPaths *paths,
+                Set **remove_symlinks_to,
+                const char *config_path,
+                const char *root_dir) {
+
+        InstallInfo *i;
+        int r = 0, q;
+
+        assert(c);
+        assert(paths);
+        assert(config_path);
+
+        /* Marks all items for removal */
+
+        while ((i = hashmap_first(c->will_install))) {
+
+                q = hashmap_ensure_allocated(&c->have_installed, string_hash_func, string_compare_func);
+                if (q < 0)
+                        return q;
+
+                assert_se(hashmap_move_one(c->have_installed, c->will_install, i->name) == 0);
+
+                q = unit_file_search(c, i, paths, root_dir, false);
+                if (q < 0) {
+                        if (r >= 0)
+                                r = q;
+
+                        return r;
+                } else if (r >= 0)
+                        r += q;
+
+                q = mark_symlink_for_removal(remove_symlinks_to, i->name);
+                if (r >= 0 && q < 0)
+                        r = q;
+        }
+
+        return r;
+}
+
+int unit_file_enable(
+                UnitFileScope scope,
+                bool runtime,
+                const char *root_dir,
+                char *files[],
+                bool force,
+                UnitFileChange **changes,
+                unsigned *n_changes) {
+
+        LookupPaths paths;
+        InstallContext c;
+        char **i, *config_path = NULL;
+        int r;
+
+        assert(scope >= 0);
+        assert(scope < _UNIT_FILE_SCOPE_MAX);
+
+        zero(paths);
+        zero(c);
+
+        r = lookup_paths_init_from_scope(&paths, scope);
+        if (r < 0)
+                return r;
+
+        r = get_config_path(scope, runtime, root_dir, &config_path);
+        if (r < 0)
+                goto finish;
+
+        STRV_FOREACH(i, files) {
+                r = install_info_add_auto(&c, *i);
+                if (r < 0)
+                        goto finish;
+        }
+
+        r = install_context_apply(&c, &paths, config_path, root_dir, force, changes, n_changes);
+
+finish:
+        install_context_done(&c);
+        lookup_paths_free(&paths);
+        free(config_path);
+
+        return r;
+}
+
+int unit_file_disable(
+                UnitFileScope scope,
+                bool runtime,
+                const char *root_dir,
+                char *files[],
+                UnitFileChange **changes,
+                unsigned *n_changes) {
+
+        LookupPaths paths;
+        InstallContext c;
+        char **i, *config_path = NULL;
+        Set *remove_symlinks_to = NULL;
+        int r, q;
+
+        assert(scope >= 0);
+        assert(scope < _UNIT_FILE_SCOPE_MAX);
+
+        zero(paths);
+        zero(c);
+
+        r = lookup_paths_init_from_scope(&paths, scope);
+        if (r < 0)
+                return r;
+
+        r = get_config_path(scope, runtime, root_dir, &config_path);
+        if (r < 0)
+                goto finish;
+
+        STRV_FOREACH(i, files) {
+                r = install_info_add_auto(&c, *i);
+                if (r < 0)
+                        goto finish;
+        }
+
+        r = install_context_mark_for_removal(&c, &paths, &remove_symlinks_to, config_path, root_dir);
+
+        q = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes);
+        if (r == 0)
+                r = 1;
+
+finish:
+        install_context_done(&c);
+        lookup_paths_free(&paths);
+        set_free_free(remove_symlinks_to);
+        free(config_path);
+
+        return r;
+}
+
+int unit_file_reenable(
+                UnitFileScope scope,
+                bool runtime,
+                const char *root_dir,
+                char *files[],
+                bool force,
+                UnitFileChange **changes,
+                unsigned *n_changes) {
+
+        LookupPaths paths;
+        InstallContext c;
+        char **i, *config_path = NULL;
+        Set *remove_symlinks_to = NULL;
+        int r, q;
+
+        assert(scope >= 0);
+        assert(scope < _UNIT_FILE_SCOPE_MAX);
+
+        zero(paths);
+        zero(c);
+
+        r = lookup_paths_init_from_scope(&paths, scope);
+        if (r < 0)
+                return r;
+
+        r = get_config_path(scope, runtime, root_dir, &config_path);
+        if (r < 0)
+                goto finish;
+
+        STRV_FOREACH(i, files) {
+                r = mark_symlink_for_removal(&remove_symlinks_to, *i);
+                if (r < 0)
+                        goto finish;
+
+                r = install_info_add_auto(&c, *i);
+                if (r < 0)
+                        goto finish;
+        }
+
+        r = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes);
+
+        q = install_context_apply(&c, &paths, config_path, root_dir, force, changes, n_changes);
+        if (r == 0)
+                r = q;
+
+finish:
+        lookup_paths_free(&paths);
+        install_context_done(&c);
+        set_free_free(remove_symlinks_to);
+        free(config_path);
+
+        return r;
+}
+
+UnitFileState unit_file_get_state(
+                UnitFileScope scope,
+                const char *root_dir,
+                const char *name) {
+
+        LookupPaths paths;
+        UnitFileState state = _UNIT_FILE_STATE_INVALID;
+        char **i, *path = NULL;
+        int r;
+
+        assert(scope >= 0);
+        assert(scope < _UNIT_FILE_SCOPE_MAX);
+        assert(name);
+
+        zero(paths);
+
+        if (root_dir && scope != UNIT_FILE_SYSTEM)
+                return -EINVAL;
+
+        if (!unit_name_is_valid_no_type(name, true))
+                return -EINVAL;
+
+        r = lookup_paths_init_from_scope(&paths, scope);
+        if (r < 0)
+                return r;
+
+        STRV_FOREACH(i, paths.unit_path) {
+                struct stat st;
+
+                free(path);
+                path = NULL;
+
+                if (root_dir)
+                        asprintf(&path, "%s/%s/%s", root_dir, *i, name);
+                else
+                        asprintf(&path, "%s/%s", *i, name);
+
+                if (!path) {
+                        r = -ENOMEM;
+                        goto finish;
+                }
+
+                if (lstat(path, &st) < 0) {
+                        if (errno == ENOENT)
+                                continue;
+
+                        r = -errno;
+                        goto finish;
+                }
+
+                if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode)) {
+                        r = -ENOENT;
+                        goto finish;
+                }
+
+                r = null_or_empty_path(path);
+                if (r < 0 && r != -ENOENT)
+                        goto finish;
+                else if (r > 0) {
+                        state = path_startswith(*i, "/run") ?
+                                UNIT_FILE_MASKED_RUNTIME : UNIT_FILE_MASKED;
+                        r = 0;
+                        goto finish;
+                }
+
+                r = find_symlinks_in_scope(scope, root_dir, name, &state);
+                if (r < 0) {
+                        goto finish;
+                } else if (r > 0) {
+                        r = 0;
+                        goto finish;
+                }
+
+                r = unit_file_can_install(&paths, root_dir, path, true);
+                if (r < 0 && errno != -ENOENT)
+                        goto finish;
+                else if (r > 0) {
+                        state = UNIT_FILE_DISABLED;
+                        r = 0;
+                        goto finish;
+                } else if (r == 0) {
+                        state = UNIT_FILE_STATIC;
+                        r = 0;
+                        goto finish;
+                }
+        }
+
+finish:
+        lookup_paths_free(&paths);
+        free(path);
+
+        return r < 0 ? r : state;
+}
+
+int unit_file_query_preset(UnitFileScope scope, const char *name) {
+        char **files, **i;
+        int r;
+
+        assert(scope >= 0);
+        assert(scope < _UNIT_FILE_SCOPE_MAX);
+        assert(name);
+
+        if (scope == UNIT_FILE_SYSTEM)
+                r = conf_files_list(&files, ".preset",
+                                    "/etc/systemd/system.preset",
+                                    "/usr/local/lib/systemd/system.preset",
+                                    "/usr/lib/systemd/system.preset",
+                                    "/lib/systemd/system.preset",
+                                    NULL);
+        else if (scope == UNIT_FILE_GLOBAL)
+                r = conf_files_list(&files, ".preset",
+                                    "/etc/systemd/user.preset",
+                                    "/usr/local/lib/systemd/user.preset",
+                                    "/usr/lib/systemd/user.preset",
+                                    NULL);
+        else
+                return 1;
+
+        if (r < 0)
+                return r;
+
+        STRV_FOREACH(i, files) {
+                FILE *f;
+
+                f = fopen(*i, "re");
+                if (!f) {
+                        if (errno == ENOENT)
+                                continue;
+
+                        r = -errno;
+                        goto finish;
+                }
+
+                for (;;) {
+                        char line[LINE_MAX], *l;
+
+                        if (!fgets(line, sizeof(line), f))
+                                break;
+
+                        l = strstrip(line);
+                        if (!*l)
+                                continue;
+
+                        if (strchr(COMMENTS, *l))
+                                continue;
+
+                        if (first_word(l, "enable")) {
+                                l += 6;
+                                l += strspn(l, WHITESPACE);
+
+                                if (fnmatch(l, name, FNM_NOESCAPE) == 0) {
+                                        r = 1;
+                                        fclose(f);
+                                        goto finish;
+                                }
+                        } else if (first_word(l, "disable")) {
+                                l += 7;
+                                l += strspn(l, WHITESPACE);
+
+                                if (fnmatch(l, name, FNM_NOESCAPE) == 0) {
+                                        r = 0;
+                                        fclose(f);
+                                        goto finish;
+                                }
+                        } else
+                                log_debug("Couldn't parse line '%s'", l);
+                }
+
+                fclose(f);
+        }
+
+        /* Default is "enable" */
+        r = 1;
+
+finish:
+        strv_free(files);
+
+        return r;
+}
+
+int unit_file_preset(
+                UnitFileScope scope,
+                bool runtime,
+                const char *root_dir,
+                char *files[],
+                bool force,
+                UnitFileChange **changes,
+                unsigned *n_changes) {
+
+        LookupPaths paths;
+        InstallContext plus, minus;
+        char **i, *config_path = NULL;
+        Set *remove_symlinks_to = NULL;
+        int r, q;
+
+        assert(scope >= 0);
+        assert(scope < _UNIT_FILE_SCOPE_MAX);
+
+        zero(paths);
+        zero(plus);
+        zero(minus);
+
+        r = lookup_paths_init_from_scope(&paths, scope);
+        if (r < 0)
+                return r;
+
+        r = get_config_path(scope, runtime, root_dir, &config_path);
+        if (r < 0)
+                goto finish;
+
+        STRV_FOREACH(i, files) {
+
+                if (!unit_name_is_valid_no_type(*i, true)) {
+                        r = -EINVAL;
+                        goto finish;
+                }
+
+                r = unit_file_query_preset(scope, *i);
+                if (r < 0)
+                        goto finish;
+
+                if (r)
+                        r = install_info_add_auto(&plus, *i);
+                else
+                        r = install_info_add_auto(&minus, *i);
+
+                if (r < 0)
+                        goto finish;
+        }
+
+        r = install_context_mark_for_removal(&minus, &paths, &remove_symlinks_to, config_path, root_dir);
+
+        q = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes);
+        if (r == 0)
+                r = q;
+
+        q = install_context_apply(&plus, &paths, config_path, root_dir, force, changes, n_changes);
+        if (r == 0)
+                r = q;
+
+finish:
+        lookup_paths_free(&paths);
+        install_context_done(&plus);
+        install_context_done(&minus);
+        set_free_free(remove_symlinks_to);
+        free(config_path);
+
+        return r;
+}
+
+int unit_file_get_list(
+                UnitFileScope scope,
+                const char *root_dir,
+                Hashmap *h) {
+
+        LookupPaths paths;
+        char **i, *buf = NULL;
+        DIR *d = NULL;
+        int r;
+
+        assert(scope >= 0);
+        assert(scope < _UNIT_FILE_SCOPE_MAX);
+        assert(h);
+
+        zero(paths);
+
+        if (root_dir && scope != UNIT_FILE_SYSTEM)
+                return -EINVAL;
+
+        r = lookup_paths_init_from_scope(&paths, scope);
+        if (r < 0)
+                return r;
+
+        STRV_FOREACH(i, paths.unit_path) {
+                struct dirent buffer, *de;
+                const char *units_dir;
+
+                free(buf);
+                buf = NULL;
+
+                if (root_dir) {
+                        if (asprintf(&buf, "%s/%s", root_dir, *i) < 0) {
+                                r = -ENOMEM;
+                                goto finish;
+                        }
+                        units_dir = buf;
+                } else
+                        units_dir = *i;
+
+                if (d)
+                        closedir(d);
+
+                d = opendir(units_dir);
+                if (!d) {
+                        if (errno == ENOENT)
+                                continue;
+
+                        r = -errno;
+                        goto finish;
+                }
+
+                for (;;) {
+                        UnitFileList *f;
+
+                        r = readdir_r(d, &buffer, &de);
+                        if (r != 0) {
+                                r = -r;
+                                goto finish;
+                        }
+
+                        if (!de)
+                                break;
+
+                        if (ignore_file(de->d_name))
+                                continue;
+
+                        if (!unit_name_is_valid_no_type(de->d_name, true))
+                                continue;
+
+                        if (hashmap_get(h, de->d_name))
+                                continue;
+
+                        r = dirent_ensure_type(d, de);
+                        if (r < 0) {
+                                if (errno == ENOENT)
+                                        continue;
+
+                                goto finish;
+                        }
+
+                        if (de->d_type != DT_LNK && de->d_type != DT_REG)
+                                continue;
+
+                        f = new0(UnitFileList, 1);
+                        if (!f) {
+                                r = -ENOMEM;
+                                goto finish;
+                        }
+
+                        f->path = path_make_absolute(de->d_name, units_dir);
+                        if (!f->path) {
+                                free(f);
+                                r = -ENOMEM;
+                                goto finish;
+                        }
+
+                        r = null_or_empty_path(f->path);
+                        if (r < 0) {
+                                free(f->path);
+                                free(f);
+                                goto finish;
+                        } else if (r > 0) {
+                                f->state =
+                                        path_startswith(*i, "/run") ?
+                                        UNIT_FILE_MASKED_RUNTIME : UNIT_FILE_MASKED;
+                                goto found;
+                        }
+
+                        r = find_symlinks_in_scope(scope, root_dir, de->d_name, &f->state);
+                        if (r < 0) {
+                                free(f->path);
+                                free(f);
+                                goto finish;
+                        } else if (r > 0)
+                                goto found;
+
+                        r = unit_file_can_install(&paths, root_dir, f->path, true);
+                        if (r < 0) {
+                                free(f->path);
+                                free(f);
+                                goto finish;
+                        } else if (r > 0) {
+                                f->state = UNIT_FILE_DISABLED;
+                                goto found;
+                        } else if (r == 0) {
+                                f->state = UNIT_FILE_STATIC;
+                                goto found;
+                        }
+
+                        free(f->path);
+                        free(f);
+                        continue;
+
+                found:
+                        r = hashmap_put(h, file_name_from_path(f->path), f);
+                        if (r < 0) {
+                                free(f->path);
+                                free(f);
+                                goto finish;
+                        }
+                }
+        }
+
+finish:
+        lookup_paths_free(&paths);
+        free(buf);
+
+        if (d)
+                closedir(d);
+
+        return r;
+}
+
+static const char* const unit_file_state_table[_UNIT_FILE_STATE_MAX] = {
+        [UNIT_FILE_ENABLED] = "enabled",
+        [UNIT_FILE_ENABLED_RUNTIME] = "enabled-runtie",
+        [UNIT_FILE_LINKED] = "linked",
+        [UNIT_FILE_LINKED_RUNTIME] = "linked-runtime",
+        [UNIT_FILE_MASKED] = "masked",
+        [UNIT_FILE_MASKED_RUNTIME] = "masked-runtime",
+        [UNIT_FILE_STATIC] = "static",
+        [UNIT_FILE_DISABLED] = "disabled"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(unit_file_state, UnitFileState);