qemu-img: info: refresh options/--help

Add missing long options and --help output.
Also add -b short option for --backing-chain, and remove
now-unused OPTION_BACKING_CHAIN.

Reorder options for consistency.

While at it, remove unused option_index variable.

Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Message-ID: <20250531171609.197078-14-mjt@tls.msk.ru>
[kwolf: Fixed up help text formatting]
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 32 insertions, 19 deletions

diff --git a/qemu-img.c b/qemu-img.c
index 950f319..530123b 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -3220,50 +3220,63 @@ static int img_info(const img_cmd_t *ccmd, int argc, char **argv)
 
     fmt = NULL;
     for(;;) {
-        int option_index = 0;
         static const struct option long_options[] = {
             {"help", no_argument, 0, 'h'},
             {"format", required_argument, 0, 'f'},
-            {"output", required_argument, 0, OPTION_OUTPUT},
-            {"backing-chain", no_argument, 0, OPTION_BACKING_CHAIN},
-            {"object", required_argument, 0, OPTION_OBJECT},
             {"image-opts", no_argument, 0, OPTION_IMAGE_OPTS},
+            {"backing-chain", no_argument, 0, OPTION_BACKING_CHAIN},
             {"force-share", no_argument, 0, 'U'},
+            {"output", required_argument, 0, OPTION_OUTPUT},
+            {"object", required_argument, 0, OPTION_OBJECT},
             {0, 0, 0, 0}
         };
-        c = getopt_long(argc, argv, ":f:hU",
-                        long_options, &option_index);
+        c = getopt_long(argc, argv, "hf:U", long_options, NULL);
         if (c == -1) {
             break;
         }
         switch(c) {
-        case ':':
-            missing_argument(argv[optind - 1]);
-            break;
-        case '?':
-            unrecognized_option(argv[optind - 1]);
-            break;
         case 'h':
-            help();
+            cmd_help(ccmd, "[-f FMT | --image-opts] [--backing-chain] [-U]\n"
+"        [--output human|json] [--object OBJDEF] FILE\n"
+,
+"  -f, --format FMT\n"
+"     specify FILE image format explicitly (default: probing is used)\n"
+"  --image-opts\n"
+"     treat FILE as an option string (key=value,..), not a file name\n"
+"     (incompatible with -f|--format)\n"
+"  --backing-chain\n"
+"     display information about the backing chain for copy-on-write overlays\n"
+"  -U, --force-share\n"
+"     open image in shared mode for concurrent access\n"
+"  --output human|json\n"
+"     specify output format (default: human)\n"
+"  --object OBJDEF\n"
+"     defines QEMU user-creatable object\n"
+"  FILE\n"
+"     name of the image file, or option string (key=value,..)\n"
+"     with --image-opts, to operate on\n"
+);
             break;
         case 'f':
             fmt = optarg;
             break;
+        case OPTION_IMAGE_OPTS:
+            image_opts = true;
+            break;
+        case OPTION_BACKING_CHAIN:
+            chain = true;
+            break;
         case 'U':
             force_share = true;
             break;
         case OPTION_OUTPUT:
             output_format = parse_output_format(argv[0], optarg);
             break;
-        case OPTION_BACKING_CHAIN:
-            chain = true;
-            break;
         case OPTION_OBJECT:
             user_creatable_process_cmdline(optarg);
             break;
-        case OPTION_IMAGE_OPTS:
-            image_opts = true;
-            break;
+        default:
+            tryhelp(argv[0]);
         }
     }
     if (optind != argc - 1) {