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Merge branch 'giomodule-cache' into 'master'

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Fix giomodule.cache being wrongly considered stale

Closes #2127

See merge request GNOME/glib!1560
This commit is contained in:
Philip Withnall 2020-07-25 23:10:25 +00:00
commit d5513ef72c
1 changed files with 13 additions and 10 deletions
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23
gio/giomodule.c
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@ -462,7 +462,7 @@ g_io_modules_scan_all_in_directory_with_scope (const char *dirname,
GDir *dir;
GStatBuf statbuf;
char *data;
time_t cache_mtime;
time_t cache_time;
GHashTable *cache;
if (!g_module_supported ())
@ -477,21 +477,24 @@ g_io_modules_scan_all_in_directory_with_scope (const char *dirname,
cache = g_hash_table_new_full (g_str_hash, g_str_equal,
g_free, (GDestroyNotify)g_strfreev);
cache_mtime = 0;
cache_time = 0;
if (g_stat (filename, &statbuf) == 0 &&
g_file_get_contents (filename, &data, NULL, NULL))
{
char **lines;
int i;
/* Cache mtime is the time the cache file was created, any file
* that has a ctime before this was created then and not modified
* since then (userspace can't change ctime). Its possible to change
* the ctime forward without changing the file content, by e.g.
* chmoding the file, but this is uncommon and will only cause us
* to not use the cache so will not cause bugs.
/* cache_time is the time the cache file was created; we also take
* into account the change time because in ostree based systems, all
* system file have mtime equal to epoch 0.
*
* Any file that has a ctime before this was created then and not modified
* since then (userspace can't change ctime). Its possible to change the
* ctime forward without changing the file content, by e.g. chmoding the
* file, but this is uncommon and will only cause us to not use the cache
* so will not cause bugs.
*/
cache_mtime = statbuf.st_mtime;
cache_time = MAX(statbuf.st_mtime, statbuf.st_ctime);
lines = g_strsplit (data, "\n", -1);
g_free (data);
@ -539,7 +542,7 @@ g_io_modules_scan_all_in_directory_with_scope (const char *dirname,
extension_points = g_hash_table_lookup (cache, name);
if (extension_points != NULL &&
g_stat (path, &statbuf) == 0 &&
statbuf.st_ctime <= cache_mtime)
statbuf.st_ctime <= cache_time)
{
/* Lazy load/init the library when first required */
for (i = 0; extension_points[i] != NULL; i++)