@@ -169,7 +169,7 @@ static int cmd_version(int argc, char **argv)
* Parse global options, between binary name and first non-option argument
* after processing all valid options (including those with arguments).
*
- * Returns index to argv where parsting stopped, optind is reset to 1
+ * Returns index to argv where parsting stopped, optind is reset to 0
*/
static int handle_global_options(int argc, char **argv)
{
@@ -205,7 +205,13 @@ static int handle_global_options(int argc, char **argv)
}
shift = optind;
- optind = 1;
+ /*
+ * optind must to be init to 0 other than 1.
+ * Since later subcommand will call getopt_long() again, we need
+ * to re-initialize the internal variables correct.
+ * Check getopt(3) NOTES sections.
+ */
+ optind = 0;
return shift;
}
In function handle_global_options(), we reset @optind to 1. However according to man page of getopt(3) NOTES section, if we need to rescan options later, @optind should be reset to 0 to initialize the internal variables correctly. This explains the reason why in cmd_check(), getopt_long() doesn't handle the following command correctly: "btrfs check /dev/data/btrfs --check-data-csum" While mkfs.btrfs handles mixed non-option and option correctly: "mkfs.btrfs -f /dev/data/disk1 --data raid1 /dev/data/disk2" Cc: Paul Jones <paul@pauljones.id.au> Cc: Hugo Mills <hugo@carfax.org.uk> Fixes: 010ceab56e06 ("btrfs-progs: rework option parser to use getopt for global options") Signed-off-by: Qu Wenruo <wqu@suse.com> --- btrfs.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)