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Merge pull request #15955 from anitazha/nullorempty

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core: check null_or_empty_path for masked units instead of /dev/null
This commit is contained in:
Zbigniew Jędrzejewski-Szmek
2020-07-08 22:18:17 +02:00
committed by GitHub
parent 62320feb9f 4276749dd3
commit 02b0109af5
3 changed files with 43 additions and 12 deletions
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src/shared/install.c
+24 -11
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@@ -1236,8 +1236,7 @@ static int unit_file_load(
"%s: unit type %s cannot be templated, ignoring.", path, unit_type_to_string(type));
if (!(flags & SEARCH_LOAD)) {
r = lstat(path, &st);
if (r < 0)
if (lstat(path, &st) < 0)
return -errno;
if (null_or_empty(&st))
@@ -1324,26 +1323,40 @@ static int unit_file_load_or_readlink(
const char *path,
const char *root_dir,
SearchFlags flags) {
_cleanup_free_ char *target = NULL;
_cleanup_free_ char *resolved = NULL;
struct stat st;
int r;
r = unit_file_load(c, info, path, root_dir, flags);
if (r != -ELOOP || (flags & SEARCH_DROPIN))
return r;
/* This is a symlink, let's read it. */
r = readlink_malloc(path, &target);
if (r < 0)
return r;
if (path_equal(target, "/dev/null"))
r = chase_symlinks(path, root_dir, CHASE_WARN | CHASE_NONEXISTENT, &resolved, NULL);
if (r >= 0 &&
root_dir &&
path_equal_ptr(path_startswith(resolved, root_dir), "dev/null"))
/* When looking under root_dir, we can't expect /dev/ to be mounted,
* so let's see if the path is a (possibly dangling) symlink to /dev/null. */
info->type = UNIT_FILE_TYPE_MASKED;
else if (r > 0 &&
stat(resolved, &st) >= 0 &&
null_or_empty(&st))
info->type = UNIT_FILE_TYPE_MASKED;
else {
_cleanup_free_ char *target = NULL;
const char *bn;
UnitType a, b;
/* This is a symlink, let's read it. We read the link again, because last time
* we followed the link until resolution, and here we need to do one step. */
r = readlink_malloc(path, &target);
if (r < 0)
return r;
bn = basename(target);
if (unit_name_is_valid(info->name, UNIT_NAME_PLAIN)) {