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cgroup-util: add cg_is_delegated helper

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Take is_delegated from cgroup-show.c, and make it a generic helper
function. This new helper will be used again in a later commit.
This commit is contained in:
Nick Rosbrook
2023-10-13 15:13:11 -04:00
parent 5897469a08
commit b426b4eed8
3 changed files with 25 additions and 28 deletions
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src/shared/cgroup-show.c
+4 -28
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@@ -128,33 +128,6 @@ static int show_cgroup_one_by_path(
return 0;
}
static int is_delegated(int cgfd, const char *path) {
_cleanup_free_ char *b = NULL;
int r;
assert(cgfd >= 0 || path);
const char *t = cgfd >= 0 ? FORMAT_PROC_FD_PATH(cgfd) : path;
r = getxattr_malloc(t, "trusted.delegate", &b);
if (ERRNO_IS_NEG_XATTR_ABSENT(r)) {
/* If the trusted xattr isn't set (preferred), then check the untrusted one. Under the
* assumption that whoever is trusted enough to own the cgroup, is also trusted enough to
* decide if it is delegated or not this should be safe. */
r = getxattr_malloc(t, "user.delegate", &b);
if (ERRNO_IS_NEG_XATTR_ABSENT(r))
return false;
}
if (r < 0)
return log_debug_errno(r, "Failed to read delegate xattr from %s, ignoring: %m", t);
r = parse_boolean(b);
if (r < 0)
return log_debug_errno(r, "Failed to parse delegate xattr from %s, ignoring: %m", t);
return r;
}
static int show_cgroup_name(
const char *path,
const char *prefix,
@@ -173,7 +146,10 @@ static int show_cgroup_name(
log_debug_errno(errno, "Failed to open cgroup '%s', ignoring: %m", path);
}
delegate = is_delegated(fd, path) > 0;
r = cg_is_delegated(fd >= 0 ? FORMAT_PROC_FD_PATH(fd) : path);
if (r < 0)
log_debug_errno(r, "Failed to check if cgroup is delegated, ignoring: %m");
delegate = r > 0;
if (FLAGS_SET(flags, OUTPUT_CGROUP_ID)) {
cg_file_handle fh = CG_FILE_HANDLE_INIT;