Add missing long options and --help output.

Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
---
 qemu-img.c | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/qemu-img.c b/qemu-img.c
index 31c1891b43..7ff63aeea2 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -1015,8 +1015,15 @@ static int img_commit(const char *cmdname, int argc, char **argv)
     for(;;) {
         static const struct option long_options[] = {
             {"help", no_argument, 0, 'h'},
+            {"quiet", no_argument, 0, 'q'},
             {"object", required_argument, 0, OPTION_OBJECT},
+            {"format", required_argument, 0, 'f'},
             {"image-opts", no_argument, 0, OPTION_IMAGE_OPTS},
+            {"cache", required_argument, 0, 't'},
+            {"drop", no_argument, 0, 'd'},
+            {"base", required_argument, 0, 'b'},
+            {"progress", no_argument, 0, 'p'},
+            {"rate", required_argument, 0, 'r'},
             {0, 0, 0, 0}
         };
         c = getopt_long(argc, argv, ":f:ht:b:dpqr:",
@@ -1032,7 +1039,20 @@ static int img_commit(const char *cmdname, int argc, char **argv)
             unrecognized_option(cmdname, argv[optind - 1]);
             break;
         case 'h':
-            help();
+            cmd_help(cmdname, "[OPTIONS] FILENAME",
+                     "Commit changes recorded in FILENAME to its base image",
+" -q|--quiet - quiet operations\n"
+" -f|--format FMT - specify FILENAME image format explicitly\n"
+" --image-opts - indicates that FILENAME is a complete image specification\n"
+"  instead of a file name (incompatible with --format)\n"
+" -t|--cache CACHE_MODE cache mode when opening image (" BDRV_DEFAULT_CACHE ")\n"
+" -d|--drop - skip emptying FILENAME on completion\n"
+" -b|--base BASE_IMG - image in the backing chain to which to commit\n"
+"  changes instead of the previous one (implies --drop)\n"
+" -p|--progress - show operation progress\n"
+" -r|--rate RATE - I/O rate limit\n"
+" --object OBJDEF - QEMU user-creatable object (eg encryption key)\n"
+" FILENAME - name of the image file to operate on\n");
             break;
         case 'f':
             fmt = optarg;
-- 
2.39.2