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-rw-r--r--src/shared/install.c100
1 files changed, 68 insertions, 32 deletions
diff --git a/src/shared/install.c b/src/shared/install.c
index e740ef3910..6a16f8985b 100644
--- a/src/shared/install.c
+++ b/src/shared/install.c
@@ -393,19 +393,40 @@ void unit_file_dump_changes(int r, const char *verb, const UnitFileChange *chang
log_error_errno(r, "Failed to %s: %m.", verb);
}
+/**
+ * Checks if two paths or symlinks from wd are the same, when root is the root of the filesystem.
+ * wc should be the full path in the host file system.
+ */
+static bool chroot_symlinks_same(const char *root, const char *wd, const char *a, const char *b) {
+ assert(path_is_absolute(wd));
+
+ /* This will give incorrect results if the paths are relative and go outside
+ * of the chroot. False negatives are possible. */
+
+ a = strjoina(path_is_absolute(a) ? root : wd, "/", a);
+ b = strjoina(path_is_absolute(b) ? root : wd, "/", b);
+ return path_equal_or_files_same(a, b);
+}
+
static int create_symlink(
+ const LookupPaths *paths,
const char *old_path,
const char *new_path,
bool force,
UnitFileChange **changes,
unsigned *n_changes) {
- _cleanup_free_ char *dest = NULL;
+ _cleanup_free_ char *dest = NULL, *dirname = NULL;
+ const char *rp;
int r;
assert(old_path);
assert(new_path);
+ rp = skip_root(paths, old_path);
+ if (rp)
+ old_path = rp;
+
/* Actually create a symlink, and remember that we did. Is
* smart enough to check if there's already a valid symlink in
* place.
@@ -436,7 +457,11 @@ static int create_symlink(
return r;
}
- if (path_equal(dest, old_path))
+ dirname = dirname_malloc(new_path);
+ if (!dirname)
+ return -ENOMEM;
+
+ if (chroot_symlinks_same(paths->root_dir, dirname, dest, old_path))
return 1;
if (!force) {
@@ -620,7 +645,7 @@ static int remove_marked_symlinks(
fd = open(config_path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW);
if (fd < 0)
- return -errno;
+ return errno == ENOENT ? 0 : -errno;
do {
int q, cfd;
@@ -903,6 +928,10 @@ static int install_info_may_process(
return 0;
}
+/**
+ * Adds a new UnitFileInstallInfo entry under name in the InstallContext.will_process
+ * hashmap, or retrieves the existing one if already present.
+ */
static int install_info_add(
InstallContext *c,
const char *name,
@@ -1334,9 +1363,8 @@ static int install_info_follow(
}
/**
- * Search for the unit file. If the unit name is a symlink,
- * follow the symlink to the target, maybe more than once.
- * Propagate the instance name if present.
+ * Search for the unit file. If the unit name is a symlink, follow the symlink to the
+ * target, maybe more than once. Propagate the instance name if present.
*/
static int install_info_traverse(
UnitFileScope scope,
@@ -1421,6 +1449,10 @@ static int install_info_traverse(
return 0;
}
+/**
+ * Call install_info_add() with name_or_path as the path (if name_or_path starts with "/")
+ * or the name (otherwise). root_dir is prepended to the path.
+ */
static int install_info_add_auto(
InstallContext *c,
const LookupPaths *paths,
@@ -1479,7 +1511,6 @@ static int install_info_symlink_alias(
STRV_FOREACH(s, i->aliases) {
_cleanup_free_ char *alias_path = NULL, *dst = NULL;
- const char *rp;
q = install_full_printf(i, *s, &dst);
if (q < 0)
@@ -1489,9 +1520,7 @@ static int install_info_symlink_alias(
if (!alias_path)
return -ENOMEM;
- rp = skip_root(paths, i->path);
-
- q = create_symlink(rp ?: i->path, alias_path, force, changes, n_changes);
+ q = create_symlink(paths, i->path, alias_path, force, changes, n_changes);
if (r == 0)
r = q;
}
@@ -1535,7 +1564,6 @@ static int install_info_symlink_wants(
STRV_FOREACH(s, list) {
_cleanup_free_ char *path = NULL, *dst = NULL;
- const char *rp;
q = install_full_printf(i, *s, &dst);
if (q < 0)
@@ -1550,9 +1578,7 @@ static int install_info_symlink_wants(
if (!path)
return -ENOMEM;
- rp = skip_root(paths, i->path);
-
- q = create_symlink(rp ?: i->path, path, true, changes, n_changes);
+ q = create_symlink(paths, i->path, path, true, changes, n_changes);
if (r == 0)
r = q;
}
@@ -1569,7 +1595,6 @@ static int install_info_symlink_link(
unsigned *n_changes) {
_cleanup_free_ char *path = NULL;
- const char *rp;
int r;
assert(i);
@@ -1587,9 +1612,7 @@ static int install_info_symlink_link(
if (!path)
return -ENOMEM;
- rp = skip_root(paths, i->path);
-
- return create_symlink(rp ?: i->path, path, force, changes, n_changes);
+ return create_symlink(paths, i->path, path, force, changes, n_changes);
}
static int install_info_apply(
@@ -1663,6 +1686,17 @@ static int install_context_apply(
if (r < 0)
return r;
+ /* We can attempt to process a masked unit when a different unit
+ * that we were processing specifies it in DefaultInstance= or Also=. */
+ if (i->type == UNIT_FILE_TYPE_MASKED) {
+ unit_file_changes_add(changes, n_changes, UNIT_FILE_IS_MASKED, i->path, NULL);
+ if (r >= 0)
+ /* Assume that some *could* have been enabled here, avoid
+ * "empty [Install] section" warning. */
+ r += 1;
+ continue;
+ }
+
if (i->type != UNIT_FILE_TYPE_REGULAR)
continue;
@@ -1765,7 +1799,7 @@ int unit_file_mask(
if (!path)
return -ENOMEM;
- q = create_symlink("/dev/null", path, force, changes, n_changes);
+ q = create_symlink(&paths, "/dev/null", path, force, changes, n_changes);
if (q < 0 && r >= 0)
r = q;
}
@@ -1925,14 +1959,12 @@ int unit_file_link(
r = 0;
STRV_FOREACH(i, todo) {
_cleanup_free_ char *new_path = NULL;
- const char *old_path;
- old_path = skip_root(&paths, *i);
new_path = path_make_absolute(basename(*i), config_path);
if (!new_path)
return -ENOMEM;
- q = create_symlink(old_path ?: *i, new_path, force, changes, n_changes);
+ q = create_symlink(&paths, *i, new_path, force, changes, n_changes);
if (q < 0 && r >= 0)
r = q;
}
@@ -1967,7 +1999,6 @@ int unit_file_revert(
unsigned *n_changes) {
_cleanup_set_free_free_ Set *remove_symlinks_to = NULL;
- /* _cleanup_(install_context_done) InstallContext c = {}; */
_cleanup_lookup_paths_free_ LookupPaths paths = {};
_cleanup_strv_free_ char **todo = NULL;
size_t n_todo = 0, n_allocated = 0;
@@ -2312,7 +2343,7 @@ int unit_file_set_default(
_cleanup_lookup_paths_free_ LookupPaths paths = {};
_cleanup_(install_context_done) InstallContext c = {};
UnitFileInstallInfo *i;
- const char *new_path, *old_path;
+ const char *new_path;
int r;
assert(scope >= 0);
@@ -2335,10 +2366,8 @@ int unit_file_set_default(
if (r < 0)
return r;
- old_path = skip_root(&paths, i->path);
new_path = strjoina(paths.persistent_config, "/" SPECIAL_DEFAULT_TARGET);
-
- return create_symlink(old_path ?: i->path, new_path, force, changes, n_changes);
+ return create_symlink(&paths, i->path, new_path, force, changes, n_changes);
}
int unit_file_get_default(
@@ -2685,18 +2714,25 @@ static int preset_prepare_one(
InstallContext *plus,
InstallContext *minus,
LookupPaths *paths,
- UnitFilePresetMode mode,
const char *name,
Presets presets,
UnitFileChange **changes,
unsigned *n_changes) {
+ _cleanup_(install_context_done) InstallContext tmp = {};
UnitFileInstallInfo *i;
int r;
- if (install_info_find(plus, name) ||
- install_info_find(minus, name))
+ if (install_info_find(plus, name) || install_info_find(minus, name))
+ return 0;
+
+ r = install_info_discover(scope, &tmp, paths, name, SEARCH_FOLLOW_CONFIG_SYMLINKS, &i);
+ if (r < 0)
+ return r;
+ if (!streq(name, i->name)) {
+ log_debug("Skipping %s because is an alias for %s", name, i->name);
return 0;
+ }
r = query_presets(name, presets);
if (r < 0)
@@ -2748,7 +2784,7 @@ int unit_file_preset(
return r;
STRV_FOREACH(i, files) {
- r = preset_prepare_one(scope, &plus, &minus, &paths, mode, *i, presets, changes, n_changes);
+ r = preset_prepare_one(scope, &plus, &minus, &paths, *i, presets, changes, n_changes);
if (r < 0)
return r;
}
@@ -2809,7 +2845,7 @@ int unit_file_preset_all(
continue;
/* we don't pass changes[] in, because we want to handle errors on our own */
- r = preset_prepare_one(scope, &plus, &minus, &paths, mode, de->d_name, presets, NULL, 0);
+ r = preset_prepare_one(scope, &plus, &minus, &paths, de->d_name, presets, NULL, 0);
if (r == -ERFKILL)
r = unit_file_changes_add(changes, n_changes,
UNIT_FILE_IS_MASKED, de->d_name, NULL);
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-15 09:54:45 +0000