Add missing long options and --help output.

Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
---
 qemu-img.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/qemu-img.c b/qemu-img.c
index f851b290cc..e7d5b1b24b 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -780,7 +780,9 @@ static int img_check(const char *cmdname, int argc, char **argv)
         int option_index = 0;
         static const struct option long_options[] = {
             {"help", no_argument, 0, 'h'},
+            {"quiet", no_argument, 0, 'q'},
             {"format", required_argument, 0, 'f'},
+            {"cache", required_argument, 0, 'T'},
             {"repair", required_argument, 0, 'r'},
             {"output", required_argument, 0, OPTION_OUTPUT},
             {"object", required_argument, 0, OPTION_OBJECT},
@@ -801,7 +803,20 @@ static int img_check(const char *cmdname, int argc, char **argv)
             unrecognized_option(cmdname, argv[optind - 1]);
             break;
         case 'h':
-            help();
+            cmd_help(cmdname, "[OPTIONS] FILENAME",
+                     "Checks image file validity",
+" -q|--quiet - quiet operations\n"
+" -f|--format FMT - specifies format of the image 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"
+" -U|--force-share - open image in shared mode for concurrent access\n"
+" --output human|json - output format\n"
+" -r|--repair leaks|all - repair particular aspect of the image\n"
+"  (image will be open in read-write mode, incompatible with --force-share)\n"
+" --object OBJDEF - QEMU user-creatable object (eg encryption key)\n"
+" FILENAME - the image file (or image specification) to operate on\n"
+);
             break;
         case 'f':
             fmt = optarg;
-- 
2.39.2