qemu-img: Add "Quiet mode" option

There can be a need to turn output to stdout off. This patch adds a -q option
that enable "Quiet mode". In Quiet mode, only errors are printed out.

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 106 insertions, 48 deletions

diff --git a/qemu-img.c b/qemu-img.c
index fa9b2af79d..3e2996e3c3 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -32,6 +32,7 @@
 #include "block/block_int.h"
 #include <getopt.h>
 #include <stdio.h>
+#include <stdarg.h>
 
 #ifdef _WIN32
 #include <windows.h>
@@ -96,6 +97,7 @@ static void help(void)
            "       rebasing in this case (useful for renaming the backing file)\n"
            "  '-h' with or without a command shows this help and lists the supported formats\n"
            "  '-p' show progress of command (only certain commands)\n"
+           "  '-q' use Quiet mode - do not print any output (except errors)\n"
            "  '-S' indicates the consecutive number of bytes that must contain only zeros\n"
            "       for qemu-img to create a sparse image during conversion\n"
            "  '--output' takes the format in which the output must be done (human or json)\n"
@@ -119,6 +121,18 @@ static void help(void)
     exit(1);
 }
 
+static int qprintf(bool quiet, const char *fmt, ...)
+{
+    int ret = 0;
+    if (!quiet) {
+        va_list args;
+        va_start(args, fmt);
+        ret = vprintf(fmt, args);
+        va_end(args);
+    }
+    return ret;
+}
+
 #if defined(WIN32)
 /* XXX: put correct support for win32 */
 static int read_password(char *buf, int buf_size)
@@ -237,7 +251,8 @@ static int print_block_option_help(const char *filename, const char *fmt)
 static BlockDriverState *bdrv_new_open(const char *filename,
                                        const char *fmt,
                                        int flags,
-                                       bool require_io)
+                                       bool require_io,
+                                       bool quiet)
 {
     BlockDriverState *bs;
     BlockDriver *drv;
@@ -263,7 +278,7 @@ static BlockDriverState *bdrv_new_open(const char *filename,
     }
 
     if (bdrv_is_encrypted(bs) && require_io) {
-        printf("Disk image '%s' is encrypted.\n", filename);
+        qprintf(quiet, "Disk image '%s' is encrypted.\n", filename);
         if (read_password(password, sizeof(password)) < 0) {
             error_report("No password given");
             goto fail;
@@ -312,9 +327,10 @@ static int img_create(int argc, char **argv)
     const char *base_filename = NULL;
     char *options = NULL;
     Error *local_err = NULL;
+    bool quiet = false;
 
     for(;;) {
-        c = getopt(argc, argv, "F:b:f:he6o:");
+        c = getopt(argc, argv, "F:b:f:he6o:q");
         if (c == -1) {
             break;
         }
@@ -343,6 +359,9 @@ static int img_create(int argc, char **argv)
         case 'o':
             options = optarg;
             break;
+        case 'q':
+            quiet = true;
+            break;
         }
     }
 
@@ -375,7 +394,7 @@ static int img_create(int argc, char **argv)
     }
 
     bdrv_img_create(filename, fmt, base_filename, base_fmt,
-                    options, img_size, BDRV_O_FLAGS, &local_err);
+                    options, img_size, BDRV_O_FLAGS, &local_err, quiet);
     if (error_is_set(&local_err)) {
         error_report("%s", error_get_pretty(local_err));
         error_free(local_err);
@@ -385,7 +404,7 @@ static int img_create(int argc, char **argv)
     return 0;
 }
 
-static void dump_json_image_check(ImageCheck *check)
+static void dump_json_image_check(ImageCheck *check, bool quiet)
 {
     Error *errp = NULL;
     QString *str;
@@ -396,47 +415,52 @@ static void dump_json_image_check(ImageCheck *check)
     obj = qmp_output_get_qobject(ov);
     str = qobject_to_json_pretty(obj);
     assert(str != NULL);
-    printf("%s\n", qstring_get_str(str));
+    qprintf(quiet, "%s\n", qstring_get_str(str));
     qobject_decref(obj);
     qmp_output_visitor_cleanup(ov);
     QDECREF(str);
 }
 
-static void dump_human_image_check(ImageCheck *check)
+static void dump_human_image_check(ImageCheck *check, bool quiet)
 {
     if (!(check->corruptions || check->leaks || check->check_errors)) {
-        printf("No errors were found on the image.\n");
+        qprintf(quiet, "No errors were found on the image.\n");
     } else {
         if (check->corruptions) {
-            printf("\n%" PRId64 " errors were found on the image.\n"
-                "Data may be corrupted, or further writes to the image "
-                "may corrupt it.\n",
-                check->corruptions);
+            qprintf(quiet, "\n%" PRId64 " errors were found on the image.\n"
+                    "Data may be corrupted, or further writes to the image "
+                    "may corrupt it.\n",
+                    check->corruptions);
         }
 
         if (check->leaks) {
-            printf("\n%" PRId64 " leaked clusters were found on the image.\n"
-                "This means waste of disk space, but no harm to data.\n",
-                check->leaks);
+            qprintf(quiet,
+                    "\n%" PRId64 " leaked clusters were found on the image.\n"
+                    "This means waste of disk space, but no harm to data.\n",
+                    check->leaks);
         }
 
         if (check->check_errors) {
-            printf("\n%" PRId64 " internal errors have occurred during the check.\n",
-                check->check_errors);
+            qprintf(quiet,
+                    "\n%" PRId64
+                    " internal errors have occurred during the check.\n",
+                    check->check_errors);
         }
     }
 
     if (check->total_clusters != 0 && check->allocated_clusters != 0) {
-        printf("%" PRId64 "/%" PRId64 " = %0.2f%% allocated, "
-               "%0.2f%% fragmented, %0.2f%% compressed clusters\n",
-               check->allocated_clusters, check->total_clusters,
-               check->allocated_clusters * 100.0 / check->total_clusters,
-               check->fragmented_clusters * 100.0 / check->allocated_clusters,
-               check->compressed_clusters * 100.0 / check->allocated_clusters);
+        qprintf(quiet, "%" PRId64 "/%" PRId64 " = %0.2f%% allocated, "
+                "%0.2f%% fragmented, %0.2f%% compressed clusters\n",
+                check->allocated_clusters, check->total_clusters,
+                check->allocated_clusters * 100.0 / check->total_clusters,
+                check->fragmented_clusters * 100.0 / check->allocated_clusters,
+                check->compressed_clusters * 100.0 /
+                check->allocated_clusters);
     }
 
     if (check->image_end_offset) {
-        printf("Image end offset: %" PRId64 "\n", check->image_end_offset);
+        qprintf(quiet,
+                "Image end offset: %" PRId64 "\n", check->image_end_offset);
     }
 }
 
@@ -496,6 +520,7 @@ static int img_check(int argc, char **argv)
     int fix = 0;
     int flags = BDRV_O_FLAGS | BDRV_O_CHECK;
     ImageCheck *check;
+    bool quiet = false;
 
     fmt = NULL;
     output = NULL;
@@ -508,7 +533,7 @@ static int img_check(int argc, char **argv)
             {"output", required_argument, 0, OPTION_OUTPUT},
             {0, 0, 0, 0}
         };
-        c = getopt_long(argc, argv, "f:hr:",
+        c = getopt_long(argc, argv, "f:hr:q",
                         long_options, &option_index);
         if (c == -1) {
             break;
@@ -535,6 +560,9 @@ static int img_check(int argc, char **argv)
         case OPTION_OUTPUT:
             output = optarg;
             break;
+        case 'q':
+            quiet = true;
+            break;
         }
     }
     if (optind >= argc) {
@@ -551,7 +579,7 @@ static int img_check(int argc, char **argv)
         return 1;
     }
 
-    bs = bdrv_new_open(filename, fmt, flags, true);
+    bs = bdrv_new_open(filename, fmt, flags, true, quiet);
     if (!bs) {
         return 1;
     }
@@ -574,12 +602,13 @@ static int img_check(int argc, char **argv)
         corruptions_fixed   = check->corruptions_fixed;
 
         if (output_format == OFORMAT_HUMAN) {
-            printf("The following inconsistencies were found and repaired:\n\n"
-                   "    %" PRId64 " leaked clusters\n"
-                   "    %" PRId64 " corruptions\n\n"
-                   "Double checking the fixed image now...\n",
-                   check->leaks_fixed,
-                   check->corruptions_fixed);
+            qprintf(quiet,
+                    "The following inconsistencies were found and repaired:\n\n"
+                    "    %" PRId64 " leaked clusters\n"
+                    "    %" PRId64 " corruptions\n\n"
+                    "Double checking the fixed image now...\n",
+                    check->leaks_fixed,
+                    check->corruptions_fixed);
         }
 
         ret = collect_image_check(bs, check, filename, fmt, 0);
@@ -590,10 +619,10 @@ static int img_check(int argc, char **argv)
 
     switch (output_format) {
     case OFORMAT_HUMAN:
-        dump_human_image_check(check);
+        dump_human_image_check(check, quiet);
         break;
     case OFORMAT_JSON:
-        dump_json_image_check(check);
+        dump_json_image_check(check, quiet);
         break;
     }
 
@@ -622,11 +651,12 @@ static int img_commit(int argc, char **argv)
     int c, ret, flags;
     const char *filename, *fmt, *cache;
     BlockDriverState *bs;
+    bool quiet = false;
 
     fmt = NULL;
     cache = BDRV_DEFAULT_CACHE;
     for(;;) {
-        c = getopt(argc, argv, "f:ht:");
+        c = getopt(argc, argv, "f:ht:q");
         if (c == -1) {
             break;
         }
@@ -641,6 +671,9 @@ static int img_commit(int argc, char **argv)
         case 't':
             cache = optarg;
             break;
+        case 'q':
+            quiet = true;
+            break;
         }
     }
     if (optind >= argc) {
@@ -655,14 +688,14 @@ static int img_commit(int argc, char **argv)
         return -1;
     }
 
-    bs = bdrv_new_open(filename, fmt, flags, true);
+    bs = bdrv_new_open(filename, fmt, flags, true, quiet);
     if (!bs) {
         return 1;
     }
     ret = bdrv_commit(bs);
     switch(ret) {
     case 0:
-        printf("Image committed.\n");
+        qprintf(quiet, "Image committed.\n");
         break;
     case -ENOENT:
         error_report("No disk inserted");
@@ -805,6 +838,7 @@ static int img_convert(int argc, char **argv)
     const char *snapshot_name = NULL;
     float local_progress = 0;
     int min_sparse = 8; /* Need at least 4k of zeros for sparse detection */
+    bool quiet = false;
 
     fmt = NULL;
     out_fmt = "raw";
@@ -812,7 +846,7 @@ static int img_convert(int argc, char **argv)
     out_baseimg = NULL;
     compress = 0;
     for(;;) {
-        c = getopt(argc, argv, "f:O:B:s:hce6o:pS:t:");
+        c = getopt(argc, argv, "f:O:B:s:hce6o:pS:t:q");
         if (c == -1) {
             break;
         }
@@ -866,9 +900,16 @@ static int img_convert(int argc, char **argv)
         case 't':
             cache = optarg;
             break;
+        case 'q':
+            quiet = true;
+            break;
         }
     }
 
+    if (quiet) {
+        progress = 0;
+    }
+
     bs_n = argc - optind - 1;
     if (bs_n < 1) {
         help();
@@ -897,7 +938,8 @@ static int img_convert(int argc, char **argv)
 
     total_sectors = 0;
     for (bs_i = 0; bs_i < bs_n; bs_i++) {
-        bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt, BDRV_O_FLAGS, true);
+        bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt, BDRV_O_FLAGS, true,
+                                 quiet);
         if (!bs[bs_i]) {
             error_report("Could not open '%s'", argv[optind + bs_i]);
             ret = -1;
@@ -1016,7 +1058,7 @@ static int img_convert(int argc, char **argv)
         return -1;
     }
 
-    out_bs = bdrv_new_open(out_filename, out_fmt, flags, true);
+    out_bs = bdrv_new_open(out_filename, out_fmt, flags, true, quiet);
     if (!out_bs) {
         ret = -1;
         goto out;
@@ -1479,7 +1521,7 @@ static ImageInfoList *collect_image_info_list(const char *filename,
         g_hash_table_insert(filenames, (gpointer)filename, NULL);
 
         bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_NO_BACKING,
-                           false);
+                           false, false);
         if (!bs) {
             goto err;
         }
@@ -1605,11 +1647,12 @@ static int img_snapshot(int argc, char **argv)
     int c, ret = 0, bdrv_oflags;
     int action = 0;
     qemu_timeval tv;
+    bool quiet = false;
 
     bdrv_oflags = BDRV_O_FLAGS | BDRV_O_RDWR;
     /* Parse commandline parameters */
     for(;;) {
-        c = getopt(argc, argv, "la:c:d:h");
+        c = getopt(argc, argv, "la:c:d:hq");
         if (c == -1) {
             break;
         }
@@ -1650,6 +1693,9 @@ static int img_snapshot(int argc, char **argv)
             action = SNAPSHOT_DELETE;
             snapshot_name = optarg;
             break;
+        case 'q':
+            quiet = true;
+            break;
         }
     }
 
@@ -1659,7 +1705,7 @@ static int img_snapshot(int argc, char **argv)
     filename = argv[optind++];
 
     /* Open the image */
-    bs = bdrv_new_open(filename, NULL, bdrv_oflags, true);
+    bs = bdrv_new_open(filename, NULL, bdrv_oflags, true, quiet);
     if (!bs) {
         return 1;
     }
@@ -1719,6 +1765,7 @@ static int img_rebase(int argc, char **argv)
     int c, flags, ret;
     int unsafe = 0;
     int progress = 0;
+    bool quiet = false;
 
     /* Parse commandline parameters */
     fmt = NULL;
@@ -1726,7 +1773,7 @@ static int img_rebase(int argc, char **argv)
     out_baseimg = NULL;
     out_basefmt = NULL;
     for(;;) {
-        c = getopt(argc, argv, "uhf:F:b:pt:");
+        c = getopt(argc, argv, "uhf:F:b:pt:q");
         if (c == -1) {
             break;
         }
@@ -1753,9 +1800,16 @@ static int img_rebase(int argc, char **argv)
         case 't':
             cache = optarg;
             break;
+        case 'q':
+            quiet = true;
+            break;
         }
     }
 
+    if (quiet) {
+        progress = 0;
+    }
+
     if ((optind >= argc) || (!unsafe && !out_baseimg)) {
         help();
     }
@@ -1777,7 +1831,7 @@ static int img_rebase(int argc, char **argv)
      * Ignore the old backing file for unsafe rebase in case we want to correct
      * the reference to a renamed or moved backing file.
      */
-    bs = bdrv_new_open(filename, fmt, flags, true);
+    bs = bdrv_new_open(filename, fmt, flags, true, quiet);
     if (!bs) {
         return 1;
     }
@@ -1989,6 +2043,7 @@ static int img_resize(int argc, char **argv)
     int c, ret, relative;
     const char *filename, *fmt, *size;
     int64_t n, total_size;
+    bool quiet = false;
     BlockDriverState *bs = NULL;
     QemuOpts *param;
     static QemuOptsList resize_options = {
@@ -2017,7 +2072,7 @@ static int img_resize(int argc, char **argv)
     /* Parse getopt arguments */
     fmt = NULL;
     for(;;) {
-        c = getopt(argc, argv, "f:h");
+        c = getopt(argc, argv, "f:hq");
         if (c == -1) {
             break;
         }
@@ -2029,6 +2084,9 @@ static int img_resize(int argc, char **argv)
         case 'f':
             fmt = optarg;
             break;
+        case 'q':
+            quiet = true;
+            break;
         }
     }
     if (optind >= argc) {
@@ -2062,7 +2120,7 @@ static int img_resize(int argc, char **argv)
     n = qemu_opt_get_size(param, BLOCK_OPT_SIZE, 0);
     qemu_opts_del(param);
 
-    bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR, true);
+    bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR, true, quiet);
     if (!bs) {
         ret = -1;
         goto out;
@@ -2082,7 +2140,7 @@ static int img_resize(int argc, char **argv)
     ret = bdrv_truncate(bs, total_size);
     switch (ret) {
     case 0:
-        printf("Image resized.\n");
+        qprintf(quiet, "Image resized.\n");
         break;
     case -ENOTSUP:
         error_report("This image does not support resize");