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-rw-r--r--src/libshared/install.c2474
1 files changed, 2474 insertions, 0 deletions
diff --git a/src/libshared/install.c b/src/libshared/install.c
new file mode 100644
index 0000000000..ef8f485cae
--- /dev/null
+++ b/src/libshared/install.c
@@ -0,0 +1,2474 @@
+/***
+ 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 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 <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <fnmatch.h>
+#include <limits.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "alloc-util.h"
+#include "conf-files.h"
+#include "conf-parser.h"
+#include "dirent-util.h"
+#include "extract-word.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "fs-util.h"
+#include "hashmap.h"
+#include "install-printf.h"
+#include "install.h"
+#include "log.h"
+#include "macro.h"
+#include "mkdir.h"
+#include "path-lookup.h"
+#include "path-util.h"
+#include "set.h"
+#include "special.h"
+#include "stat-util.h"
+#include "string-table.h"
+#include "string-util.h"
+#include "strv.h"
+#include "unit-name.h"
+
+#define UNIT_FILE_FOLLOW_SYMLINK_MAX 64
+
+typedef enum SearchFlags {
+ SEARCH_LOAD = 1,
+ SEARCH_FOLLOW_CONFIG_SYMLINKS = 2,
+} SearchFlags;
+
+typedef struct {
+ OrderedHashmap *will_process;
+ OrderedHashmap *have_processed;
+} InstallContext;
+
+static int in_search_path(const char *path, char **search) {
+ _cleanup_free_ char *parent = NULL;
+ char **i;
+
+ assert(path);
+
+ parent = dirname_malloc(path);
+ if (!parent)
+ return -ENOMEM;
+
+ STRV_FOREACH(i, search)
+ if (path_equal(parent, *i))
+ return true;
+
+ return false;
+}
+
+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);
+
+ /* This determines where we shall create or remove our
+ * installation ("configuration") symlinks */
+
+ switch (scope) {
+
+ case UNIT_FILE_SYSTEM:
+
+ if (runtime)
+ p = path_join(root_dir, "/run/systemd/system", NULL);
+ else
+ p = path_join(root_dir, SYSTEM_CONFIG_UNIT_PATH, NULL);
+ 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)
+ return -EINVAL;
+
+ if (runtime)
+ r = user_runtime_dir(&p);
+ else
+ r = user_config_home(&p);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ return -ENOENT;
+
+ break;
+
+ default:
+ assert_not_reached("Bad scope");
+ }
+
+ if (!p)
+ return -ENOMEM;
+
+ *ret = p;
+ return 0;
+}
+
+static bool is_config_path(UnitFileScope scope, const char *path) {
+ int r;
+
+ assert(scope >= 0);
+ assert(scope < _UNIT_FILE_SCOPE_MAX);
+ assert(path);
+
+ /* Checks whether the specified path is intended for
+ * configuration or is outside of it */
+
+ switch (scope) {
+
+ case UNIT_FILE_SYSTEM:
+ case UNIT_FILE_GLOBAL:
+ return path_startswith(path, "/etc") ||
+ path_startswith(path, SYSTEM_CONFIG_UNIT_PATH) ||
+ path_startswith(path, "/run");
+
+
+ case UNIT_FILE_USER: {
+ _cleanup_free_ char *p = NULL;
+
+ r = user_config_home(&p);
+ if (r < 0)
+ return r;
+ if (r > 0 && path_startswith(path, p))
+ return true;
+
+ p = mfree(p);
+
+ r = user_runtime_dir(&p);
+ if (r < 0)
+ return r;
+ if (r > 0 && path_startswith(path, p))
+ return true;
+
+ return false;
+ }
+
+ default:
+ assert_not_reached("Bad scope");
+ }
+}
+
+
+static int verify_root_dir(UnitFileScope scope, const char **root_dir) {
+ int r;
+
+ assert(root_dir);
+
+ /* Verifies that the specified root directory to operate on
+ * makes sense. Reset it to NULL if it is the root directory
+ * or set to empty */
+
+ if (isempty(*root_dir) || path_equal(*root_dir, "/")) {
+ *root_dir = NULL;
+ return 0;
+ }
+
+ if (scope != UNIT_FILE_SYSTEM)
+ return -EINVAL;
+
+ r = is_dir(*root_dir, true);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ return -ENOTDIR;
+
+ return 0;
+}
+
+int unit_file_changes_add(
+ UnitFileChange **changes,
+ unsigned *n_changes,
+ UnitFileChangeType type,
+ const char *path,
+ const char *source) {
+
+ UnitFileChange *c;
+ unsigned i;
+
+ 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;
+
+ path_kill_slashes(c[i].path);
+
+ if (source) {
+ c[i].source = strdup(source);
+ if (!c[i].source) {
+ free(c[i].path);
+ return -ENOMEM;
+ }
+
+ path_kill_slashes(c[i].path);
+ } else
+ c[i].source = NULL;
+
+ *n_changes = i+1;
+ return 0;
+}
+
+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 int create_symlink(
+ const char *old_path,
+ const char *new_path,
+ bool force,
+ UnitFileChange **changes,
+ unsigned *n_changes) {
+
+ _cleanup_free_ char *dest = NULL;
+ int r;
+
+ assert(old_path);
+ assert(new_path);
+
+ /* Actually create a symlink, and remember that we did. Is
+ * smart enough to check if there's already a valid symlink in
+ * place. */
+
+ mkdir_parents_label(new_path, 0755);
+
+ if (symlink(old_path, new_path) >= 0) {
+ unit_file_changes_add(changes, n_changes, UNIT_FILE_SYMLINK, new_path, old_path);
+ return 0;
+ }
+
+ if (errno != EEXIST)
+ return -errno;
+
+ r = readlink_malloc(new_path, &dest);
+ if (r < 0)
+ return r;
+
+ if (path_equal(dest, old_path))
+ return 0;
+
+ if (!force)
+ return -EEXIST;
+
+ r = symlink_atomic(old_path, new_path);
+ if (r < 0)
+ return r;
+
+ unit_file_changes_add(changes, n_changes, UNIT_FILE_UNLINK, new_path, NULL);
+ unit_file_changes_add(changes, n_changes, UNIT_FILE_SYMLINK, new_path, old_path);
+
+ 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_ops);
+ if (r < 0)
+ return r;
+
+ n = strdup(p);
+ if (!n)
+ return -ENOMEM;
+
+ path_kill_slashes(n);
+
+ r = set_consume(*remove_symlinks_to, n);
+ if (r == -EEXIST)
+ return 0;
+ if (r < 0)
+ return r;
+
+ return 1;
+}
+
+static int remove_marked_symlinks_fd(
+ Set *remove_symlinks_to,
+ int fd,
+ const char *path,
+ const char *config_path,
+ bool *restart,
+ UnitFileChange **changes,
+ unsigned *n_changes) {
+
+ _cleanup_closedir_ DIR *d = NULL;
+ struct dirent *de;
+ int r = 0;
+
+ assert(remove_symlinks_to);
+ assert(fd >= 0);
+ assert(path);
+ assert(config_path);
+ assert(restart);
+
+ d = fdopendir(fd);
+ if (!d) {
+ safe_close(fd);
+ return -errno;
+ }
+
+ rewinddir(d);
+
+ FOREACH_DIRENT(de, d, return -errno) {
+
+ dirent_ensure_type(d, de);
+
+ if (de->d_type == DT_DIR) {
+ _cleanup_free_ char *p = NULL;
+ int nfd, q;
+
+ 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) {
+ safe_close(nfd);
+ return -ENOMEM;
+ }
+
+ /* This will close nfd, regardless whether it succeeds or not */
+ q = remove_marked_symlinks_fd(remove_symlinks_to, nfd, p, config_path, restart, changes, n_changes);
+ if (q < 0 && r == 0)
+ r = q;
+
+ } else if (de->d_type == DT_LNK) {
+ _cleanup_free_ char *p = NULL, *dest = NULL;
+ bool found;
+ int q;
+
+ if (!unit_name_is_valid(de->d_name, UNIT_NAME_ANY))
+ continue;
+
+ p = path_make_absolute(de->d_name, path);
+ if (!p)
+ return -ENOMEM;
+
+ q = readlink_malloc(p, &dest);
+ if (q < 0) {
+ if (q == -ENOENT)
+ continue;
+
+ if (r == 0)
+ r = q;
+ continue;
+ }
+
+ /* We remove all links pointing to a file or
+ * path that is marked, as well as all files
+ * sharing the same name as a file that is
+ * marked. */
+
+ found =
+ set_contains(remove_symlinks_to, dest) ||
+ set_contains(remove_symlinks_to, basename(dest)) ||
+ set_contains(remove_symlinks_to, de->d_name);
+
+ if (!found)
+ continue;
+
+ if (unlink(p) < 0 && errno != ENOENT) {
+ if (r == 0)
+ r = -errno;
+ continue;
+ }
+
+ path_kill_slashes(p);
+ (void) rmdir_parents(p, config_path);
+
+ unit_file_changes_add(changes, n_changes, UNIT_FILE_UNLINK, p, NULL);
+
+ q = mark_symlink_for_removal(&remove_symlinks_to, p);
+ if (q < 0)
+ return q;
+ if (q > 0)
+ *restart = true;
+ }
+ }
+
+ return r;
+}
+
+static int remove_marked_symlinks(
+ Set *remove_symlinks_to,
+ const char *config_path,
+ UnitFileChange **changes,
+ unsigned *n_changes) {
+
+ _cleanup_close_ int fd = -1;
+ bool restart;
+ int r = 0;
+
+ 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;
+ restart = false;
+
+ cfd = fcntl(fd, F_DUPFD_CLOEXEC, 3);
+ if (cfd < 0)
+ return -errno;
+
+ /* This takes possession of cfd and closes it */
+ q = remove_marked_symlinks_fd(remove_symlinks_to, cfd, config_path, config_path, &restart, changes, n_changes);
+ if (r == 0)
+ r = q;
+ } while (restart);
+
+ return r;
+}
+
+static int find_symlinks_fd(
+ const char *root_dir,
+ const char *name,
+ int fd,
+ const char *path,
+ const char *config_path,
+ bool *same_name_link) {
+
+ _cleanup_closedir_ DIR *d = NULL;
+ struct dirent *de;
+ int r = 0;
+
+ assert(name);
+ assert(fd >= 0);
+ assert(path);
+ assert(config_path);
+ assert(same_name_link);
+
+ d = fdopendir(fd);
+ if (!d) {
+ safe_close(fd);
+ return -errno;
+ }
+
+ FOREACH_DIRENT(de, d, return -errno) {
+
+ dirent_ensure_type(d, de);
+
+ if (de->d_type == DT_DIR) {
+ _cleanup_free_ char *p = NULL;
+ int nfd, q;
+
+ 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) {
+ safe_close(nfd);
+ return -ENOMEM;
+ }
+
+ /* This will close nfd, regardless whether it succeeds or not */
+ q = find_symlinks_fd(root_dir, name, nfd, p, config_path, same_name_link);
+ if (q > 0)
+ return 1;
+ if (r == 0)
+ r = q;
+
+ } else if (de->d_type == DT_LNK) {
+ _cleanup_free_ char *p = NULL, *dest = NULL;
+ bool found_path, found_dest, b = false;
+ int q;
+
+ /* Acquire symlink name */
+ p = path_make_absolute(de->d_name, path);
+ if (!p)
+ return -ENOMEM;
+
+ /* Acquire symlink destination */
+ q = readlink_malloc(p, &dest);
+ if (q == -ENOENT)
+ continue;
+ if (q < 0) {
+ if (r == 0)
+ r = q;
+ continue;
+ }
+
+ /* Make absolute */
+ if (!path_is_absolute(dest)) {
+ char *x;
+
+ x = prefix_root(root_dir, dest);
+ if (!x)
+ return -ENOMEM;
+
+ free(dest);
+ dest = x;
+ }
+
+ /* 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(basename(dest), name);
+
+ if (found_path && found_dest) {
+ _cleanup_free_ char *t = NULL;
+
+ /* Filter out same name links in the main
+ * config path */
+ t = path_make_absolute(name, config_path);
+ if (!t)
+ return -ENOMEM;
+
+ b = path_equal(t, p);
+ }
+
+ if (b)
+ *same_name_link = true;
+ else if (found_path || found_dest)
+ return 1;
+ }
+ }
+
+ return r;
+}
+
+static int find_symlinks(
+ const char *root_dir,
+ 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) {
+ if (errno == ENOENT)
+ return 0;
+ return -errno;
+ }
+
+ /* This takes possession of fd and closes it */
+ return find_symlinks_fd(root_dir, 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) {
+
+ _cleanup_free_ char *normal_path = NULL, *runtime_path = NULL;
+ bool same_name_link_runtime = false, same_name_link = false;
+ int r;
+
+ assert(scope >= 0);
+ assert(scope < _UNIT_FILE_SCOPE_MAX);
+ assert(name);
+
+ /* First look in the normal config path */
+ r = get_config_path(scope, false, root_dir, &normal_path);
+ if (r < 0)
+ return r;
+
+ r = find_symlinks(root_dir, name, normal_path, &same_name_link);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ *state = UNIT_FILE_ENABLED;
+ return r;
+ }
+
+ /* Then look in runtime config path */
+ r = get_config_path(scope, true, root_dir, &runtime_path);
+ if (r < 0)
+ return r;
+
+ r = find_symlinks(root_dir, name, runtime_path, &same_name_link_runtime);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ *state = UNIT_FILE_ENABLED_RUNTIME;
+ return r;
+ }
+
+ /* Hmm, we didn't find it, but maybe we found the same name
+ * link? */
+ if (same_name_link) {
+ *state = UNIT_FILE_LINKED;
+ return 1;
+ }
+ if (same_name_link_runtime) {
+ *state = UNIT_FILE_LINKED_RUNTIME;
+ return 1;
+ }
+
+ return 0;
+}
+
+static void install_info_free(UnitFileInstallInfo *i) {
+
+ if (!i)
+ return;
+
+ free(i->name);
+ free(i->path);
+ strv_free(i->aliases);
+ strv_free(i->wanted_by);
+ strv_free(i->required_by);
+ strv_free(i->also);
+ free(i->default_instance);
+ free(i->symlink_target);
+ free(i);
+}
+
+static OrderedHashmap* install_info_hashmap_free(OrderedHashmap *m) {
+ UnitFileInstallInfo *i;
+
+ if (!m)
+ return NULL;
+
+ while ((i = ordered_hashmap_steal_first(m)))
+ install_info_free(i);
+
+ return ordered_hashmap_free(m);
+}
+
+static void install_context_done(InstallContext *c) {
+ assert(c);
+
+ c->will_process = install_info_hashmap_free(c->will_process);
+ c->have_processed = install_info_hashmap_free(c->have_processed);
+}
+
+static UnitFileInstallInfo *install_info_find(InstallContext *c, const char *name) {
+ UnitFileInstallInfo *i;
+
+ i = ordered_hashmap_get(c->have_processed, name);
+ if (i)
+ return i;
+
+ return ordered_hashmap_get(c->will_process, name);
+}
+
+static int install_info_add(
+ InstallContext *c,
+ const char *name,
+ const char *path,
+ UnitFileInstallInfo **ret) {
+
+ UnitFileInstallInfo *i = NULL;
+ int r;
+
+ assert(c);
+ assert(name || path);
+
+ if (!name)
+ name = basename(path);
+
+ if (!unit_name_is_valid(name, UNIT_NAME_ANY))
+ return -EINVAL;
+
+ i = install_info_find(c, name);
+ if (i) {
+ if (ret)
+ *ret = i;
+ return 0;
+ }
+
+ r = ordered_hashmap_ensure_allocated(&c->will_process, &string_hash_ops);
+ if (r < 0)
+ return r;
+
+ i = new0(UnitFileInstallInfo, 1);
+ if (!i)
+ return -ENOMEM;
+ i->type = _UNIT_FILE_TYPE_INVALID;
+
+ 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 = ordered_hashmap_put(c->will_process, i->name, i);
+ if (r < 0)
+ goto fail;
+
+ if (ret)
+ *ret = i;
+
+ return 0;
+
+fail:
+ install_info_free(i);
+ return r;
+}
+
+static int install_info_add_auto(
+ InstallContext *c,
+ const char *name_or_path,
+ UnitFileInstallInfo **ret) {
+
+ assert(c);
+ assert(name_or_path);
+
+ if (path_is_absolute(name_or_path))
+ return install_info_add(c, NULL, name_or_path, ret);
+ else
+ return install_info_add(c, name_or_path, NULL, ret);
+}
+
+static int config_parse_also(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ UnitFileInstallInfo *i = userdata;
+ InstallContext *c = data;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+
+ for (;;) {
+ _cleanup_free_ char *word = NULL;
+
+ r = extract_first_word(&rvalue, &word, NULL, 0);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ break;
+
+ r = install_info_add(c, word, NULL, NULL);
+ if (r < 0)
+ return r;
+
+ r = strv_push(&i->also, word);
+ if (r < 0)
+ return r;
+
+ word = NULL;
+ }
+
+ return 0;
+}
+
+static int config_parse_default_instance(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ UnitFileInstallInfo *i = data;
+ char *printed;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+
+ r = install_full_printf(i, rvalue, &printed);
+ if (r < 0)
+ return r;
+
+ if (!unit_instance_is_valid(printed)) {
+ free(printed);
+ return -EINVAL;
+ }
+
+ free(i->default_instance);
+ i->default_instance = printed;
+
+ return 0;
+}
+
+static int unit_file_load(
+ InstallContext *c,
+ UnitFileInstallInfo *info,
+ const char *path,
+ const char *root_dir,
+ SearchFlags flags) {
+
+ const ConfigTableItem items[] = {
+ { "Install", "Alias", config_parse_strv, 0, &info->aliases },
+ { "Install", "WantedBy", config_parse_strv, 0, &info->wanted_by },
+ { "Install", "RequiredBy", config_parse_strv, 0, &info->required_by },
+ { "Install", "DefaultInstance", config_parse_default_instance, 0, info },
+ { "Install", "Also", config_parse_also, 0, c },
+ {}
+ };
+
+ _cleanup_fclose_ FILE *f = NULL;
+ _cleanup_close_ int fd = -1;
+ struct stat st;
+ int r;
+
+ assert(c);
+ assert(info);
+ assert(path);
+
+ path = prefix_roota(root_dir, path);
+
+ if (!(flags & SEARCH_LOAD)) {
+ r = lstat(path, &st);
+ if (r < 0)
+ return -errno;
+
+ if (null_or_empty(&st))
+ info->type = UNIT_FILE_TYPE_MASKED;
+ else if (S_ISREG(st.st_mode))
+ info->type = UNIT_FILE_TYPE_REGULAR;
+ else if (S_ISLNK(st.st_mode))
+ return -ELOOP;
+ else if (S_ISDIR(st.st_mode))
+ return -EISDIR;
+ else
+ return -ENOTTY;
+
+ return 0;
+ }
+
+ fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
+ if (fd < 0)
+ return -errno;
+ if (fstat(fd, &st) < 0)
+ return -errno;
+ if (null_or_empty(&st)) {
+ info->type = UNIT_FILE_TYPE_MASKED;
+ return 0;
+ }
+ if (S_ISDIR(st.st_mode))
+ return -EISDIR;
+ if (!S_ISREG(st.st_mode))
+ return -ENOTTY;
+
+ f = fdopen(fd, "re");
+ if (!f)
+ return -errno;
+ fd = -1;
+
+ r = config_parse(NULL, path, f,
+ NULL,
+ config_item_table_lookup, items,
+ true, true, false, info);
+ if (r < 0)
+ return r;
+
+ info->type = UNIT_FILE_TYPE_REGULAR;
+
+ return
+ (int) strv_length(info->aliases) +
+ (int) strv_length(info->wanted_by) +
+ (int) strv_length(info->required_by);
+}
+
+static int unit_file_load_or_readlink(
+ InstallContext *c,
+ UnitFileInstallInfo *info,
+ const char *path,
+ const char *root_dir,
+ SearchFlags flags) {
+
+ _cleanup_free_ char *np = NULL;
+ int r;
+
+ r = unit_file_load(c, info, path, root_dir, flags);
+ if (r != -ELOOP)
+ return r;
+
+ /* This is a symlink, let's read it. */
+
+ r = readlink_and_make_absolute_root(root_dir, path, &np);
+ if (r < 0)
+ return r;
+
+ if (path_equal(np, "/dev/null"))
+ info->type = UNIT_FILE_TYPE_MASKED;
+ else {
+ const char *bn;
+ UnitType a, b;
+
+ bn = basename(np);
+
+ if (unit_name_is_valid(info->name, UNIT_NAME_PLAIN)) {
+
+ if (!unit_name_is_valid(bn, UNIT_NAME_PLAIN))
+ return -EINVAL;
+
+ } else if (unit_name_is_valid(info->name, UNIT_NAME_INSTANCE)) {
+
+ if (!unit_name_is_valid(bn, UNIT_NAME_INSTANCE|UNIT_NAME_TEMPLATE))
+ return -EINVAL;
+
+ } else if (unit_name_is_valid(info->name, UNIT_NAME_TEMPLATE)) {
+
+ if (!unit_name_is_valid(bn, UNIT_NAME_TEMPLATE))
+ return -EINVAL;
+ } else
+ return -EINVAL;
+
+ /* Enforce that the symlink destination does not
+ * change the unit file type. */
+
+ a = unit_name_to_type(info->name);
+ b = unit_name_to_type(bn);
+ if (a < 0 || b < 0 || a != b)
+ return -EINVAL;
+
+ info->type = UNIT_FILE_TYPE_SYMLINK;
+ info->symlink_target = np;
+ np = NULL;
+ }
+
+ return 0;
+}
+
+static int unit_file_search(
+ InstallContext *c,
+ UnitFileInstallInfo *info,
+ const LookupPaths *paths,
+ const char *root_dir,
+ SearchFlags flags) {
+
+ char **p;
+ int r;
+
+ assert(c);
+ assert(info);
+ assert(paths);
+
+ /* Was this unit already loaded? */
+ if (info->type != _UNIT_FILE_TYPE_INVALID)
+ return 0;
+
+ if (info->path)
+ return unit_file_load_or_readlink(c, info, info->path, root_dir, flags);
+
+ assert(info->name);
+
+ STRV_FOREACH(p, paths->unit_path) {
+ _cleanup_free_ char *path = NULL;
+
+ path = strjoin(*p, "/", info->name, NULL);
+ if (!path)
+ return -ENOMEM;
+
+ r = unit_file_load_or_readlink(c, info, path, root_dir, flags);
+ if (r < 0) {
+ if (r != -ENOENT)
+ return r;
+ } else {
+ info->path = path;
+ path = NULL;
+ return r;
+ }
+ }
+
+ if (unit_name_is_valid(info->name, UNIT_NAME_INSTANCE)) {
+
+ /* Unit file doesn't exist, however instance
+ * enablement was requested. We will check if it is
+ * possible to load template unit file. */
+
+ _cleanup_free_ char *template = NULL;
+
+ r = unit_name_template(info->name, &template);
+ if (r < 0)
+ return r;
+
+ STRV_FOREACH(p, paths->unit_path) {
+ _cleanup_free_ char *path = NULL;
+
+ path = strjoin(*p, "/", template, NULL);
+ if (!path)
+ return -ENOMEM;
+
+ r = unit_file_load_or_readlink(c, info, path, root_dir, flags);
+ if (r < 0) {
+ if (r != -ENOENT)
+ return r;
+ } else {
+ info->path = path;
+ path = NULL;
+ return r;
+ }
+ }
+ }
+
+ return -ENOENT;
+}
+
+static int install_info_follow(
+ InstallContext *c,
+ UnitFileInstallInfo *i,
+ const char *root_dir,
+ SearchFlags flags) {
+
+ assert(c);
+ assert(i);
+
+ if (i->type != UNIT_FILE_TYPE_SYMLINK)
+ return -EINVAL;
+ if (!i->symlink_target)
+ return -EINVAL;
+
+ /* If the basename doesn't match, the caller should add a
+ * complete new entry for this. */
+
+ if (!streq(basename(i->symlink_target), i->name))
+ return -EXDEV;
+
+ free(i->path);
+ i->path = i->symlink_target;
+ i->symlink_target = NULL;
+ i->type = _UNIT_FILE_TYPE_INVALID;
+
+ return unit_file_load_or_readlink(c, i, i->path, root_dir, flags);
+}
+
+static int install_info_traverse(
+ UnitFileScope scope,
+ InstallContext *c,
+ const char *root_dir,
+ const LookupPaths *paths,
+ UnitFileInstallInfo *start,
+ SearchFlags flags,
+ UnitFileInstallInfo **ret) {
+
+ UnitFileInstallInfo *i;
+ unsigned k = 0;
+ int r;
+
+ assert(paths);
+ assert(start);
+ assert(c);
+
+ r = unit_file_search(c, start, paths, root_dir, flags);
+ if (r < 0)
+ return r;
+
+ i = start;
+ while (i->type == UNIT_FILE_TYPE_SYMLINK) {
+ /* Follow the symlink */
+
+ if (++k > UNIT_FILE_FOLLOW_SYMLINK_MAX)
+ return -ELOOP;
+
+ if (!(flags & SEARCH_FOLLOW_CONFIG_SYMLINKS) && is_config_path(scope, i->path))
+ return -ELOOP;
+
+ r = install_info_follow(c, i, root_dir, flags);
+ if (r < 0) {
+ _cleanup_free_ char *buffer = NULL;
+ const char *bn;
+
+ if (r != -EXDEV)
+ return r;
+
+ /* Target has a different name, create a new
+ * install info object for that, and continue
+ * with that. */
+
+ bn = basename(i->symlink_target);
+
+ if (unit_name_is_valid(i->name, UNIT_NAME_INSTANCE) &&
+ unit_name_is_valid(bn, UNIT_NAME_TEMPLATE)) {
+
+ _cleanup_free_ char *instance = NULL;
+
+ r = unit_name_to_instance(i->name, &instance);
+ if (r < 0)
+ return r;
+
+ r = unit_name_replace_instance(bn, instance, &buffer);
+ if (r < 0)
+ return r;
+
+ bn = buffer;
+ }
+
+ r = install_info_add(c, bn, NULL, &i);
+ if (r < 0)
+ return r;
+
+ r = unit_file_search(c, i, paths, root_dir, flags);
+ if (r < 0)
+ return r;
+ }
+
+ /* Try again, with the new target we found. */
+ }
+
+ if (ret)
+ *ret = i;
+
+ return 0;
+}
+
+static int install_info_discover(
+ UnitFileScope scope,
+ InstallContext *c,
+ const char *root_dir,
+ const LookupPaths *paths,
+ const char *name,
+ SearchFlags flags,
+ UnitFileInstallInfo **ret) {
+
+ UnitFileInstallInfo *i;
+ int r;
+
+ assert(c);
+ assert(paths);
+ assert(name);
+
+ r = install_info_add_auto(c, name, &i);
+ if (r < 0)
+ return r;
+
+ return install_info_traverse(scope, c, root_dir, paths, i, flags, ret);
+}
+
+static int install_info_symlink_alias(
+ UnitFileInstallInfo *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) {
+ _cleanup_free_ char *alias_path = NULL, *dst = NULL;
+
+ q = install_full_printf(i, *s, &dst);
+ if (q < 0)
+ return q;
+
+ alias_path = path_make_absolute(dst, config_path);
+ if (!alias_path)
+ return -ENOMEM;
+
+ q = create_symlink(i->path, alias_path, force, changes, n_changes);
+ if (r == 0)
+ r = q;
+ }
+
+ return r;
+}
+
+static int install_info_symlink_wants(
+ UnitFileInstallInfo *i,
+ const char *config_path,
+ char **list,
+ const char *suffix,
+ bool force,
+ UnitFileChange **changes,
+ unsigned *n_changes) {
+
+ _cleanup_free_ char *buf = NULL;
+ const char *n;
+ char **s;
+ int r = 0, q;
+
+ assert(i);
+ assert(config_path);
+
+ if (unit_name_is_valid(i->name, UNIT_NAME_TEMPLATE)) {
+
+ /* Don't install any symlink if there's no default
+ * instance configured */
+
+ if (!i->default_instance)
+ return 0;
+
+ r = unit_name_replace_instance(i->name, i->default_instance, &buf);
+ if (r < 0)
+ return r;
+
+ n = buf;
+ } else
+ n = i->name;
+
+ STRV_FOREACH(s, list) {
+ _cleanup_free_ char *path = NULL, *dst = NULL;
+
+ q = install_full_printf(i, *s, &dst);
+ if (q < 0)
+ return q;
+
+ if (!unit_name_is_valid(dst, UNIT_NAME_ANY)) {
+ r = -EINVAL;
+ continue;
+ }
+
+ path = strjoin(config_path, "/", dst, suffix, n, NULL);
+ if (!path)
+ return -ENOMEM;
+
+ q = create_symlink(i->path, path, force, changes, n_changes);
+ if (r == 0)
+ r = q;
+ }
+
+ return r;
+}
+
+static int install_info_symlink_link(
+ UnitFileInstallInfo *i,
+ const LookupPaths *paths,
+ const char *config_path,
+ const char *root_dir,
+ bool force,
+ UnitFileChange **changes,
+ unsigned *n_changes) {
+
+ _cleanup_free_ char *path = NULL;
+ int r;
+
+ assert(i);
+ assert(paths);
+ assert(config_path);
+ assert(i->path);
+
+ r = in_search_path(i->path, paths->unit_path);
+ if (r != 0)
+ return r;
+
+ path = strjoin(config_path, "/", i->name, NULL);
+ if (!path)
+ return -ENOMEM;
+
+ return create_symlink(i->path, path, force, changes, n_changes);
+}
+
+static int install_info_apply(
+ UnitFileInstallInfo *i,
+ const LookupPaths *paths,
+ const char *config_path,
+ const char *root_dir,
+ bool force,
+ UnitFileChange **changes,
+ unsigned *n_changes) {
+
+ int r, q;
+
+ assert(i);
+ assert(paths);
+ assert(config_path);
+
+ if (i->type != UNIT_FILE_TYPE_REGULAR)
+ return 0;
+
+ r = install_info_symlink_alias(i, config_path, force, changes, n_changes);
+
+ q = install_info_symlink_wants(i, config_path, i->wanted_by, ".wants/", force, changes, n_changes);
+ if (r == 0)
+ r = q;
+
+ q = install_info_symlink_wants(i, config_path, i->required_by, ".requires/", force, changes, n_changes);
+ if (r == 0)
+ r = q;
+
+ q = install_info_symlink_link(i, paths, config_path, root_dir, force, changes, n_changes);
+ if (r == 0)
+ r = q;
+
+ return r;
+}
+
+static int install_context_apply(
+ UnitFileScope scope,
+ InstallContext *c,
+ const LookupPaths *paths,
+ const char *config_path,
+ const char *root_dir,
+ bool force,
+ SearchFlags flags,
+ UnitFileChange **changes,
+ unsigned *n_changes) {
+
+ UnitFileInstallInfo *i;
+ int r;
+
+ assert(c);
+ assert(paths);
+ assert(config_path);
+
+ if (ordered_hashmap_isempty(c->will_process))
+ return 0;
+
+ r = ordered_hashmap_ensure_allocated(&c->have_processed, &string_hash_ops);
+ if (r < 0)
+ return r;
+
+ r = 0;
+ while ((i = ordered_hashmap_first(c->will_process))) {
+ int q;
+
+ q = ordered_hashmap_move_one(c->have_processed, c->will_process, i->name);
+ if (q < 0)
+ return q;
+
+ r = install_info_traverse(scope, c, root_dir, paths, i, flags, NULL);
+ if (r < 0)
+ return r;
+
+ if (i->type != UNIT_FILE_TYPE_REGULAR)
+ continue;
+
+ q = install_info_apply(i, paths, config_path, root_dir, force, changes, n_changes);
+ if (r >= 0) {
+ if (q < 0)
+ r = q;
+ else
+ r+= q;
+ }
+ }
+
+ return r;
+}
+
+static int install_context_mark_for_removal(
+ UnitFileScope scope,
+ InstallContext *c,
+ const LookupPaths *paths,
+ Set **remove_symlinks_to,
+ const char *config_path,
+ const char *root_dir) {
+
+ UnitFileInstallInfo *i;
+ int r;
+
+ assert(c);
+ assert(paths);
+ assert(config_path);
+
+ /* Marks all items for removal */
+
+ if (ordered_hashmap_isempty(c->will_process))
+ return 0;
+
+ r = ordered_hashmap_ensure_allocated(&c->have_processed, &string_hash_ops);
+ if (r < 0)
+ return r;
+
+ while ((i = ordered_hashmap_first(c->will_process))) {
+
+ r = ordered_hashmap_move_one(c->have_processed, c->will_process, i->name);
+ if (r < 0)
+ return r;
+
+ r = install_info_traverse(scope, c, root_dir, paths, i, SEARCH_LOAD|SEARCH_FOLLOW_CONFIG_SYMLINKS, NULL);
+ if (r < 0)
+ return r;
+
+ if (i->type != UNIT_FILE_TYPE_REGULAR)
+ continue;
+
+ r = mark_symlink_for_removal(remove_symlinks_to, i->name);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+int unit_file_mask(
+ UnitFileScope scope,
+ bool runtime,
+ const char *root_dir,
+ char **files,
+ bool force,
+ UnitFileChange **changes,
+ unsigned *n_changes) {
+
+ _cleanup_free_ char *prefix = NULL;
+ char **i;
+ int r;
+
+ assert(scope >= 0);
+ assert(scope < _UNIT_FILE_SCOPE_MAX);
+
+ r = verify_root_dir(scope, &root_dir);
+ if (r < 0)
+ return r;
+
+ r = get_config_path(scope, runtime, root_dir, &prefix);
+ if (r < 0)
+ return r;
+
+ STRV_FOREACH(i, files) {
+ _cleanup_free_ char *path = NULL;
+ int q;
+
+ if (!unit_name_is_valid(*i, UNIT_NAME_ANY)) {
+ if (r == 0)
+ r = -EINVAL;
+ continue;
+ }
+
+ path = path_make_absolute(*i, prefix);
+ if (!path)
+ return -ENOMEM;
+
+ q = create_symlink("/dev/null", path, force, changes, n_changes);
+ if (q < 0 && r >= 0)
+ r = q;
+ }
+
+ return r;
+}
+
+int unit_file_unmask(
+ UnitFileScope scope,
+ bool runtime,
+ const char *root_dir,
+ char **files,
+ UnitFileChange **changes,
+ unsigned *n_changes) {
+
+ _cleanup_set_free_free_ Set *remove_symlinks_to = NULL;
+ _cleanup_free_ char *config_path = NULL;
+ _cleanup_free_ char **todo = NULL;
+ size_t n_todo = 0, n_allocated = 0;
+ char **i;
+ int r, q;
+
+ assert(scope >= 0);
+ assert(scope < _UNIT_FILE_SCOPE_MAX);
+
+ r = verify_root_dir(scope, &root_dir);
+ if (r < 0)
+ return r;
+
+ r = get_config_path(scope, runtime, root_dir, &config_path);
+ if (r < 0)
+ return r;
+
+ STRV_FOREACH(i, files) {
+ _cleanup_free_ char *path = NULL;
+
+ if (!unit_name_is_valid(*i, UNIT_NAME_ANY))
+ return -EINVAL;
+
+ path = path_make_absolute(*i, config_path);
+ if (!path)
+ return -ENOMEM;
+
+ r = null_or_empty_path(path);
+ if (r == -ENOENT)
+ continue;
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ if (!GREEDY_REALLOC0(todo, n_allocated, n_todo + 2))
+ return -ENOMEM;
+
+ todo[n_todo++] = *i;
+ }
+
+ strv_uniq(todo);
+
+ r = 0;
+ STRV_FOREACH(i, todo) {
+ _cleanup_free_ char *path = NULL;
+
+ path = path_make_absolute(*i, config_path);
+ if (!path)
+ return -ENOMEM;
+
+ if (unlink(path) < 0) {
+ if (errno != -ENOENT && r >= 0)
+ r = -errno;
+ } else {
+ q = mark_symlink_for_removal(&remove_symlinks_to, path);
+ if (q < 0)
+ return q;
+
+ unit_file_changes_add(changes, n_changes, UNIT_FILE_UNLINK, path, NULL);
+ }
+ }
+
+ q = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes);
+ if (r >= 0)
+ r = q;
+
+ return r;
+}
+
+int unit_file_link(
+ UnitFileScope scope,
+ bool runtime,
+ const char *root_dir,
+ char **files,
+ bool force,
+ UnitFileChange **changes,
+ unsigned *n_changes) {
+
+ _cleanup_lookup_paths_free_ LookupPaths paths = {};
+ _cleanup_free_ char *config_path = NULL;
+ _cleanup_free_ char **todo = NULL;
+ size_t n_todo = 0, n_allocated = 0;
+ char **i;
+ int r, q;
+
+ assert(scope >= 0);
+ assert(scope < _UNIT_FILE_SCOPE_MAX);
+
+ r = verify_root_dir(scope, &root_dir);
+ if (r < 0)
+ return r;
+
+ r = lookup_paths_init_from_scope(&paths, scope, root_dir);
+ if (r < 0)
+ return r;
+
+ r = get_config_path(scope, runtime, root_dir, &config_path);
+ if (r < 0)
+ return r;
+
+ STRV_FOREACH(i, files) {
+ _cleanup_free_ char *full = NULL;
+ struct stat st;
+ char *fn;
+
+ if (!path_is_absolute(*i))
+ return -EINVAL;
+
+ fn = basename(*i);
+ if (!unit_name_is_valid(fn, UNIT_NAME_ANY))
+ return -EINVAL;
+
+ full = prefix_root(root_dir, *i);
+ if (!full)
+ return -ENOMEM;
+
+ if (lstat(full, &st) < 0)
+ return -errno;
+ if (S_ISLNK(st.st_mode))
+ return -ELOOP;
+ if (S_ISDIR(st.st_mode))
+ return -EISDIR;
+ if (!S_ISREG(st.st_mode))
+ return -ENOTTY;
+
+ q = in_search_path(*i, paths.unit_path);
+ if (q < 0)
+ return q;
+ if (q > 0)
+ continue;
+
+ if (!GREEDY_REALLOC0(todo, n_allocated, n_todo + 2))
+ return -ENOMEM;
+
+ todo[n_todo++] = *i;
+ }
+
+ strv_uniq(todo);
+
+ r = 0;
+ STRV_FOREACH(i, todo) {
+ _cleanup_free_ char *path = NULL;
+
+ path = path_make_absolute(basename(*i), config_path);
+ if (!path)
+ return -ENOMEM;
+
+ q = create_symlink(*i, path, force, changes, n_changes);
+ if (q < 0 && r >= 0)
+ r = q;
+ }
+
+ return r;
+}
+
+int unit_file_add_dependency(
+ UnitFileScope scope,
+ bool runtime,
+ const char *root_dir,
+ char **files,
+ const char *target,
+ UnitDependency dep,
+ bool force,
+ UnitFileChange **changes,
+ unsigned *n_changes) {
+
+ _cleanup_lookup_paths_free_ LookupPaths paths = {};
+ _cleanup_(install_context_done) InstallContext c = {};
+ _cleanup_free_ char *config_path = NULL;
+ UnitFileInstallInfo *i, *target_info;
+ char **f;
+ int r;
+
+ assert(scope >= 0);
+ assert(scope < _UNIT_FILE_SCOPE_MAX);
+ assert(target);
+
+ if (!IN_SET(dep, UNIT_WANTS, UNIT_REQUIRES))
+ return -EINVAL;
+
+ if (!unit_name_is_valid(target, UNIT_NAME_ANY))
+ return -EINVAL;
+
+ r = verify_root_dir(scope, &root_dir);
+ if (r < 0)
+ return r;
+
+ r = lookup_paths_init_from_scope(&paths, scope, root_dir);
+ if (r < 0)
+ return r;
+
+ r = get_config_path(scope, runtime, root_dir, &config_path);
+ if (r < 0)
+ return r;
+
+ r = install_info_discover(scope, &c, root_dir, &paths, target, SEARCH_FOLLOW_CONFIG_SYMLINKS, &target_info);
+ if (r < 0)
+ return r;
+ if (target_info->type == UNIT_FILE_TYPE_MASKED)
+ return -ESHUTDOWN;
+
+ assert(target_info->type == UNIT_FILE_TYPE_REGULAR);
+
+ STRV_FOREACH(f, files) {
+ char ***l;
+
+ r = install_info_discover(scope, &c, root_dir, &paths, *f, SEARCH_FOLLOW_CONFIG_SYMLINKS, &i);
+ if (r < 0)
+ return r;
+ if (i->type == UNIT_FILE_TYPE_MASKED)
+ return -ESHUTDOWN;
+
+ assert(i->type == UNIT_FILE_TYPE_REGULAR);
+
+ /* We didn't actually load anything from the unit
+ * file, but instead just add in our new symlink to
+ * create. */
+
+ if (dep == UNIT_WANTS)
+ l = &i->wanted_by;
+ else
+ l = &i->required_by;
+
+ strv_free(*l);
+ *l = strv_new(target_info->name, NULL);
+ if (!*l)
+ return -ENOMEM;
+ }
+
+ return install_context_apply(scope, &c, &paths, config_path, root_dir, force, SEARCH_FOLLOW_CONFIG_SYMLINKS, changes, n_changes);
+}
+
+int unit_file_enable(
+ UnitFileScope scope,
+ bool runtime,
+ const char *root_dir,
+ char **files,
+ bool force,
+ UnitFileChange **changes,
+ unsigned *n_changes) {
+
+ _cleanup_lookup_paths_free_ LookupPaths paths = {};
+ _cleanup_(install_context_done) InstallContext c = {};
+ _cleanup_free_ char *config_path = NULL;
+ UnitFileInstallInfo *i;
+ char **f;
+ int r;
+
+ assert(scope >= 0);
+ assert(scope < _UNIT_FILE_SCOPE_MAX);
+
+ r = verify_root_dir(scope, &root_dir);
+ if (r < 0)
+ return r;
+
+ r = lookup_paths_init_from_scope(&paths, scope, root_dir);
+ if (r < 0)
+ return r;
+
+ r = get_config_path(scope, runtime, root_dir, &config_path);
+ if (r < 0)
+ return r;
+
+ STRV_FOREACH(f, files) {
+ r = install_info_discover(scope, &c, root_dir, &paths, *f, SEARCH_LOAD, &i);
+ if (r < 0)
+ return r;
+ if (i->type == UNIT_FILE_TYPE_MASKED)
+ return -ESHUTDOWN;
+
+ assert(i->type == UNIT_FILE_TYPE_REGULAR);
+ }
+
+ /* This will return the number of symlink rules that were
+ supposed to be created, not the ones actually created. This
+ is useful to determine whether the passed files had any
+ installation data at all. */
+
+ return install_context_apply(scope, &c, &paths, config_path, root_dir, force, SEARCH_LOAD, changes, n_changes);
+}
+
+int unit_file_disable(
+ UnitFileScope scope,
+ bool runtime,
+ const char *root_dir,
+ char **files,
+ UnitFileChange **changes,
+ unsigned *n_changes) {
+
+ _cleanup_lookup_paths_free_ LookupPaths paths = {};
+ _cleanup_(install_context_done) InstallContext c = {};
+ _cleanup_free_ char *config_path = NULL;
+ _cleanup_set_free_free_ Set *remove_symlinks_to = NULL;
+ char **i;
+ int r;
+
+ assert(scope >= 0);
+ assert(scope < _UNIT_FILE_SCOPE_MAX);
+
+ r = verify_root_dir(scope, &root_dir);
+ if (r < 0)
+ return r;
+
+ r = lookup_paths_init_from_scope(&paths, scope, root_dir);
+ if (r < 0)
+ return r;
+
+ r = get_config_path(scope, runtime, root_dir, &config_path);
+ if (r < 0)
+ return r;
+
+ STRV_FOREACH(i, files) {
+ if (!unit_name_is_valid(*i, UNIT_NAME_ANY))
+ return -EINVAL;
+
+ r = install_info_add(&c, *i, NULL, NULL);
+ if (r < 0)
+ return r;
+ }
+
+ r = install_context_mark_for_removal(scope, &c, &paths, &remove_symlinks_to, config_path, root_dir);
+ if (r < 0)
+ return r;
+
+ return remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes);
+}
+
+int unit_file_reenable(
+ UnitFileScope scope,
+ bool runtime,
+ const char *root_dir,
+ char **files,
+ bool force,
+ UnitFileChange **changes,
+ unsigned *n_changes) {
+
+ char **n;
+ int r;
+ size_t l, i;
+
+ /* First, we invoke the disable command with only the basename... */
+ l = strv_length(files);
+ n = newa(char*, l+1);
+ for (i = 0; i < l; i++)
+ n[i] = basename(files[i]);
+ n[i] = NULL;
+
+ r = unit_file_disable(scope, runtime, root_dir, n, changes, n_changes);
+ if (r < 0)
+ return r;
+
+ /* But the enable command with the full name */
+ return unit_file_enable(scope, runtime, root_dir, files, force, changes, n_changes);
+}
+
+int unit_file_set_default(
+ UnitFileScope scope,
+ const char *root_dir,
+ const char *name,
+ bool force,
+ UnitFileChange **changes,
+ unsigned *n_changes) {
+
+ _cleanup_lookup_paths_free_ LookupPaths paths = {};
+ _cleanup_(install_context_done) InstallContext c = {};
+ _cleanup_free_ char *config_path = NULL;
+ UnitFileInstallInfo *i;
+ const char *path;
+ int r;
+
+ assert(scope >= 0);
+ assert(scope < _UNIT_FILE_SCOPE_MAX);
+ assert(name);
+
+ if (unit_name_to_type(name) != UNIT_TARGET)
+ return -EINVAL;
+ if (streq(name, SPECIAL_DEFAULT_TARGET))
+ return -EINVAL;
+
+ r = verify_root_dir(scope, &root_dir);
+ if (r < 0)
+ return r;
+
+ r = lookup_paths_init_from_scope(&paths, scope, root_dir);
+ if (r < 0)
+ return r;
+
+ r = get_config_path(scope, false, root_dir, &config_path);
+ if (r < 0)
+ return r;
+
+ r = install_info_discover(scope, &c, root_dir, &paths, name, 0, &i);
+ if (r < 0)
+ return r;
+ if (i->type == UNIT_FILE_TYPE_MASKED)
+ return -ESHUTDOWN;
+
+ path = strjoina(config_path, "/" SPECIAL_DEFAULT_TARGET);
+
+ return create_symlink(i->path, path, force, changes, n_changes);
+}
+
+int unit_file_get_default(
+ UnitFileScope scope,
+ const char *root_dir,
+ char **name) {
+
+ _cleanup_lookup_paths_free_ LookupPaths paths = {};
+ _cleanup_(install_context_done) InstallContext c = {};
+ UnitFileInstallInfo *i;
+ char *n;
+ int r;
+
+ assert(scope >= 0);
+ assert(scope < _UNIT_FILE_SCOPE_MAX);
+ assert(name);
+
+ r = verify_root_dir(scope, &root_dir);
+ if (r < 0)
+ return r;
+
+ r = lookup_paths_init_from_scope(&paths, scope, root_dir);
+ if (r < 0)
+ return r;
+
+ r = install_info_discover(scope, &c, root_dir, &paths, SPECIAL_DEFAULT_TARGET, SEARCH_FOLLOW_CONFIG_SYMLINKS, &i);
+ if (r < 0)
+ return r;
+ if (i->type == UNIT_FILE_TYPE_MASKED)
+ return -ESHUTDOWN;
+
+ n = strdup(i->name);
+ if (!n)
+ return -ENOMEM;
+
+ *name = n;
+ return 0;
+}
+
+int unit_file_lookup_state(
+ UnitFileScope scope,
+ const char *root_dir,
+ const LookupPaths *paths,
+ const char *name,
+ UnitFileState *ret) {
+
+ _cleanup_(install_context_done) InstallContext c = {};
+ UnitFileInstallInfo *i;
+ UnitFileState state;
+ int r;
+
+ assert(paths);
+ assert(name);
+
+ if (!unit_name_is_valid(name, UNIT_NAME_ANY))
+ return -EINVAL;
+
+ r = verify_root_dir(scope, &root_dir);
+ if (r < 0)
+ return r;
+
+ r = install_info_discover(scope, &c, root_dir, paths, name, SEARCH_LOAD|SEARCH_FOLLOW_CONFIG_SYMLINKS, &i);
+ if (r < 0)
+ return r;
+
+ /* Shortcut things, if the caller just wants to know if this unit exists. */
+ if (!ret)
+ return 0;
+
+ switch (i->type) {
+
+ case UNIT_FILE_TYPE_MASKED:
+ state = path_startswith(i->path, "/run") ? UNIT_FILE_MASKED_RUNTIME : UNIT_FILE_MASKED;
+ break;
+
+ case UNIT_FILE_TYPE_REGULAR:
+ r = find_symlinks_in_scope(scope, root_dir, i->name, &state);
+ if (r < 0)
+ return r;
+ if (r == 0) {
+ if (UNIT_FILE_INSTALL_INFO_HAS_RULES(i))
+ state = UNIT_FILE_DISABLED;
+ else if (UNIT_FILE_INSTALL_INFO_HAS_ALSO(i))
+ state = UNIT_FILE_INDIRECT;
+ else
+ state = UNIT_FILE_STATIC;
+ }
+
+ break;
+
+ default:
+ assert_not_reached("Unexpect unit file type.");
+ }
+
+ *ret = state;
+ return 0;
+}
+
+int unit_file_get_state(
+ UnitFileScope scope,
+ const char *root_dir,
+ const char *name,
+ UnitFileState *ret) {
+
+ _cleanup_lookup_paths_free_ LookupPaths paths = {};
+ int r;
+
+ assert(scope >= 0);
+ assert(scope < _UNIT_FILE_SCOPE_MAX);
+ assert(name);
+
+ r = verify_root_dir(scope, &root_dir);
+ if (r < 0)
+ return r;
+
+ r = lookup_paths_init_from_scope(&paths, scope, root_dir);
+ if (r < 0)
+ return r;
+
+ return unit_file_lookup_state(scope, root_dir, &paths, name, ret);
+}
+
+int unit_file_query_preset(UnitFileScope scope, const char *root_dir, const char *name) {
+ _cleanup_strv_free_ char **files = NULL;
+ char **p;
+ int r;
+
+ assert(scope >= 0);
+ assert(scope < _UNIT_FILE_SCOPE_MAX);
+ assert(name);
+
+ r = verify_root_dir(scope, &root_dir);
+ if (r < 0)
+ return r;
+
+ if (!unit_name_is_valid(name, UNIT_NAME_ANY))
+ return -EINVAL;
+
+ if (scope == UNIT_FILE_SYSTEM)
+ r = conf_files_list(&files, ".preset", root_dir,
+ "/etc/systemd/system-preset",
+ "/usr/local/lib/systemd/system-preset",
+ "/usr/lib/systemd/system-preset",
+#ifdef HAVE_SPLIT_USR
+ "/lib/systemd/system-preset",
+#endif
+ NULL);
+ else if (scope == UNIT_FILE_GLOBAL)
+ r = conf_files_list(&files, ".preset", root_dir,
+ "/etc/systemd/user-preset",
+ "/usr/local/lib/systemd/user-preset",
+ "/usr/lib/systemd/user-preset",
+ NULL);
+ else
+ return 1; /* Default is "enable" */
+
+ if (r < 0)
+ return r;
+
+ STRV_FOREACH(p, files) {
+ _cleanup_fclose_ FILE *f;
+ char line[LINE_MAX];
+
+ f = fopen(*p, "re");
+ if (!f) {
+ if (errno == ENOENT)
+ continue;
+
+ return -errno;
+ }
+
+ FOREACH_LINE(line, f, return -errno) {
+ const char *parameter;
+ char *l;
+
+ l = strstrip(line);
+
+ if (isempty(l))
+ continue;
+ if (strchr(COMMENTS, *l))
+ continue;
+
+ parameter = first_word(l, "enable");
+ if (parameter) {
+ if (fnmatch(parameter, name, FNM_NOESCAPE) == 0) {
+ log_debug("Preset file says enable %s.", name);
+ return 1;
+ }
+
+ continue;
+ }
+
+ parameter = first_word(l, "disable");
+ if (parameter) {
+ if (fnmatch(parameter, name, FNM_NOESCAPE) == 0) {
+ log_debug("Preset file says disable %s.", name);
+ return 0;
+ }
+
+ continue;
+ }
+
+ log_debug("Couldn't parse line '%s'", l);
+ }
+ }
+
+ /* Default is "enable" */
+ log_debug("Preset file doesn't say anything about %s, enabling.", name);
+ return 1;
+}
+
+static int execute_preset(
+ UnitFileScope scope,
+ InstallContext *plus,
+ InstallContext *minus,
+ const LookupPaths *paths,
+ const char *config_path,
+ const char *root_dir,
+ char **files,
+ UnitFilePresetMode mode,
+ bool force,
+ UnitFileChange **changes,
+ unsigned *n_changes) {
+
+ int r;
+
+ assert(plus);
+ assert(minus);
+ assert(paths);
+ assert(config_path);
+
+ if (mode != UNIT_FILE_PRESET_ENABLE_ONLY) {
+ _cleanup_set_free_free_ Set *remove_symlinks_to = NULL;
+
+ r = install_context_mark_for_removal(scope, minus, paths, &remove_symlinks_to, config_path, root_dir);
+ if (r < 0)
+ return r;
+
+ r = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes);
+ } else
+ r = 0;
+
+ if (mode != UNIT_FILE_PRESET_DISABLE_ONLY) {
+ int q;
+
+ /* Returns number of symlinks that where supposed to be installed. */
+ q = install_context_apply(scope, plus, paths, config_path, root_dir, force, SEARCH_LOAD, changes, n_changes);
+ if (r >= 0) {
+ if (q < 0)
+ r = q;
+ else
+ r+= q;
+ }
+ }
+
+ return r;
+}
+
+static int preset_prepare_one(
+ UnitFileScope scope,
+ InstallContext *plus,
+ InstallContext *minus,
+ LookupPaths *paths,
+ const char *root_dir,
+ UnitFilePresetMode mode,
+ const char *name) {
+
+ UnitFileInstallInfo *i;
+ int r;
+
+ if (install_info_find(plus, name) ||
+ install_info_find(minus, name))
+ return 0;
+
+ r = unit_file_query_preset(scope, root_dir, name);
+ if (r < 0)
+ return r;
+
+ if (r > 0) {
+ r = install_info_discover(scope, plus, root_dir, paths, name, SEARCH_LOAD|SEARCH_FOLLOW_CONFIG_SYMLINKS, &i);
+ if (r < 0)
+ return r;
+
+ if (i->type == UNIT_FILE_TYPE_MASKED)
+ return -ESHUTDOWN;
+ } else
+ r = install_info_discover(scope, minus, root_dir, paths, name, SEARCH_FOLLOW_CONFIG_SYMLINKS, &i);
+
+ return r;
+}
+
+int unit_file_preset(
+ UnitFileScope scope,
+ bool runtime,
+ const char *root_dir,
+ char **files,
+ UnitFilePresetMode mode,
+ bool force,
+ UnitFileChange **changes,
+ unsigned *n_changes) {
+
+ _cleanup_(install_context_done) InstallContext plus = {}, minus = {};
+ _cleanup_lookup_paths_free_ LookupPaths paths = {};
+ _cleanup_free_ char *config_path = NULL;
+ char **i;
+ int r;
+
+ assert(scope >= 0);
+ assert(scope < _UNIT_FILE_SCOPE_MAX);
+ assert(mode < _UNIT_FILE_PRESET_MAX);
+
+ r = verify_root_dir(scope, &root_dir);
+ if (r < 0)
+ return r;
+
+ r = lookup_paths_init_from_scope(&paths, scope, root_dir);
+ if (r < 0)
+ return r;
+
+ r = get_config_path(scope, runtime, root_dir, &config_path);
+ if (r < 0)
+ return r;
+
+ STRV_FOREACH(i, files) {
+ if (!unit_name_is_valid(*i, UNIT_NAME_ANY))
+ return -EINVAL;
+
+ r = preset_prepare_one(scope, &plus, &minus, &paths, root_dir, mode, *i);
+ if (r < 0)
+ return r;
+ }
+
+ return execute_preset(scope, &plus, &minus, &paths, config_path, root_dir, files, mode, force, changes, n_changes);
+}
+
+int unit_file_preset_all(
+ UnitFileScope scope,
+ bool runtime,
+ const char *root_dir,
+ UnitFilePresetMode mode,
+ bool force,
+ UnitFileChange **changes,
+ unsigned *n_changes) {
+
+ _cleanup_(install_context_done) InstallContext plus = {}, minus = {};
+ _cleanup_lookup_paths_free_ LookupPaths paths = {};
+ _cleanup_free_ char *config_path = NULL;
+ char **i;
+ int r;
+
+ assert(scope >= 0);
+ assert(scope < _UNIT_FILE_SCOPE_MAX);
+ assert(mode < _UNIT_FILE_PRESET_MAX);
+
+ r = verify_root_dir(scope, &root_dir);
+ if (r < 0)
+ return r;
+
+ r = lookup_paths_init_from_scope(&paths, scope, root_dir);
+ if (r < 0)
+ return r;
+
+ r = get_config_path(scope, runtime, root_dir, &config_path);
+ if (r < 0)
+ return r;
+
+ STRV_FOREACH(i, paths.unit_path) {
+ _cleanup_closedir_ DIR *d = NULL;
+ _cleanup_free_ char *units_dir;
+ struct dirent *de;
+
+ units_dir = path_join(root_dir, *i, NULL);
+ if (!units_dir)
+ return -ENOMEM;
+
+ d = opendir(units_dir);
+ if (!d) {
+ if (errno == ENOENT)
+ continue;
+
+ return -errno;
+ }
+
+ FOREACH_DIRENT(de, d, return -errno) {
+
+ if (!unit_name_is_valid(de->d_name, UNIT_NAME_ANY))
+ continue;
+
+ dirent_ensure_type(d, de);
+
+ if (!IN_SET(de->d_type, DT_LNK, DT_REG))
+ continue;
+
+ r = preset_prepare_one(scope, &plus, &minus, &paths, root_dir, mode, de->d_name);
+ if (r < 0)
+ return r;
+ }
+ }
+
+ return execute_preset(scope, &plus, &minus, &paths, config_path, root_dir, NULL, mode, force, changes, n_changes);
+}
+
+static void unit_file_list_free_one(UnitFileList *f) {
+ if (!f)
+ return;
+
+ free(f->path);
+ free(f);
+}
+
+Hashmap* unit_file_list_free(Hashmap *h) {
+ UnitFileList *i;
+
+ while ((i = hashmap_steal_first(h)))
+ unit_file_list_free_one(i);
+
+ return hashmap_free(h);
+}
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(UnitFileList*, unit_file_list_free_one);
+
+int unit_file_get_list(
+ UnitFileScope scope,
+ const char *root_dir,
+ Hashmap *h) {
+
+ _cleanup_lookup_paths_free_ LookupPaths paths = {};
+ char **i;
+ int r;
+
+ assert(scope >= 0);
+ assert(scope < _UNIT_FILE_SCOPE_MAX);
+ assert(h);
+
+ r = verify_root_dir(scope, &root_dir);
+ if (r < 0)
+ return r;
+
+ r = lookup_paths_init_from_scope(&paths, scope, root_dir);
+ if (r < 0)
+ return r;
+
+ STRV_FOREACH(i, paths.unit_path) {
+ _cleanup_closedir_ DIR *d = NULL;
+ _cleanup_free_ char *units_dir;
+ struct dirent *de;
+
+ units_dir = path_join(root_dir, *i, NULL);
+ if (!units_dir)
+ return -ENOMEM;
+
+ d = opendir(units_dir);
+ if (!d) {
+ if (errno == ENOENT)
+ continue;
+
+ return -errno;
+ }
+
+ FOREACH_DIRENT(de, d, return -errno) {
+ _cleanup_(unit_file_list_free_onep) UnitFileList *f = NULL;
+
+ if (!unit_name_is_valid(de->d_name, UNIT_NAME_ANY))
+ continue;
+
+ if (hashmap_get(h, de->d_name))
+ continue;
+
+ dirent_ensure_type(d, de);
+
+ if (!IN_SET(de->d_type, DT_LNK, DT_REG))
+ continue;
+
+ f = new0(UnitFileList, 1);
+ if (!f)
+ return -ENOMEM;
+
+ f->path = path_make_absolute(de->d_name, units_dir);
+ if (!f->path)
+ return -ENOMEM;
+
+ r = unit_file_lookup_state(scope, root_dir, &paths, basename(f->path), &f->state);
+ if (r < 0)
+ f->state = UNIT_FILE_BAD;
+
+ r = hashmap_put(h, basename(f->path), f);
+ if (r < 0)
+ return r;
+
+ f = NULL; /* prevent cleanup */
+ }
+ }
+
+ return 0;
+}
+
+static const char* const unit_file_state_table[_UNIT_FILE_STATE_MAX] = {
+ [UNIT_FILE_ENABLED] = "enabled",
+ [UNIT_FILE_ENABLED_RUNTIME] = "enabled-runtime",
+ [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",
+ [UNIT_FILE_INDIRECT] = "indirect",
+ [UNIT_FILE_BAD] = "bad",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(unit_file_state, UnitFileState);
+
+static const char* const unit_file_change_type_table[_UNIT_FILE_CHANGE_TYPE_MAX] = {
+ [UNIT_FILE_SYMLINK] = "symlink",
+ [UNIT_FILE_UNLINK] = "unlink",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(unit_file_change_type, UnitFileChangeType);
+
+static const char* const unit_file_preset_mode_table[_UNIT_FILE_PRESET_MAX] = {
+ [UNIT_FILE_PRESET_FULL] = "full",
+ [UNIT_FILE_PRESET_ENABLE_ONLY] = "enable-only",
+ [UNIT_FILE_PRESET_DISABLE_ONLY] = "disable-only",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(unit_file_preset_mode, UnitFilePresetMode);
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-10 04:48:47 +0000