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homed: automatically clean up empty user record files

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See: #15178
This commit is contained in:
Lennart Poettering 2020-05-20 17:25:50 +02:00
parent e4005ffe00
commit 20f4a308bf
1 changed files with 28 additions and 0 deletions
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28
src/home/homed-manager.c
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@ -329,16 +329,31 @@ static int manager_add_home_by_record(
_cleanup_(user_record_unrefp) UserRecord *hr = NULL;
unsigned line, column;
int r, is_signed;
struct stat st;
Home *h;
assert(m);
assert(name);
assert(fname);
if (fstatat(dir_fd, fname, &st, 0) < 0)
return log_error_errno(errno, "Failed to stat identity record %s: %m", fname);
if (!S_ISREG(st.st_mode)) {
log_debug("Identity record file %s is not a regular file, ignoring.", fname);
return 0;
}
if (st.st_size == 0)
goto unlink_this_file;
r = json_parse_file_at(NULL, dir_fd, fname, JSON_PARSE_SENSITIVE, &v, &line, &column);
if (r < 0)
return log_error_errno(r, "Failed to parse identity record at %s:%u%u: %m", fname, line, column);
if (json_variant_is_blank_object(v))
goto unlink_this_file;
hr = user_record_new();
if (!hr)
return log_oom();
@ -394,6 +409,19 @@ static int manager_add_home_by_record(
h->signed_locally = is_signed == USER_RECORD_SIGNED_EXCLUSIVE;
return 1;
unlink_this_file:
/* If this is an empty file, then let's just remove it. An empty file is not useful in any case, and
* apparently xfs likes to leave empty files around when not unmounted cleanly (see
* https://github.com/systemd/systemd/issues/15178 for example). Note that we don't delete non-empty
* files even if they are invalid, because that's just too risky, we might delete data the user still
* needs. But empty files are never useful, hence let's just remove them. */
if (unlinkat(dir_fd, fname, 0) < 0)
return log_error_errno(errno, "Failed to remove empty user record file %s: %m", fname);
log_notice("Discovered empty user record file /var/lib/systemd/home/%s, removed automatically.", fname);
return 0;
}
static int manager_enumerate_records(Manager *m) {