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qemu-img: add the 'dd' subcommand
This patch adds a basic dd subcommand analogous to dd(1) to qemu-img. For the start, this implements the bs, if, of and count options and requires both if and of to be specified (no stdin/stdout if not specified) and doesn't support tty, pipes, etc. The image format must be specified with -O for the output if the raw format is not the intended one. Two tests are added to test qemu-img dd. Signed-off-by: Reda Sallahi <fullmanet@gmail.com> Message-id: 20160810024312.14544-1-fullmanet@gmail.com Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> [mreitz: Moved test 158 to 170] Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Reda Sallahi
Max Reitz
parent
a008535b9f
commit
86ce1f6e2b
@ -45,6 +45,12 @@ STEXI
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@item convert [--object @var{objectdef}] [--image-opts] [-c] [-p] [-q] [-n] [-f @var{fmt}] [-t @var{cache}] [-T @var{src_cache}] [-O @var{output_fmt}] [-o @var{options}] [-s @var{snapshot_id_or_name}] [-l @var{snapshot_param}] [-S @var{sparse_size}] @var{filename} [@var{filename2} [...]] @var{output_filename}
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ETEXI
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DEF("dd", img_dd,
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"dd [--image-opts] [-f fmt] [-O output_fmt] [bs=block_size] [count=blocks] if=input of=output")
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STEXI
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@item dd [--image-opts] [-f @var{fmt}] [-O @var{output_fmt}] [bs=@var{block_size}] [count=@var{blocks}] if=@var{input} of=@var{output}
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ETEXI
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DEF("info", img_info,
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"info [--object objectdef] [--image-opts] [-f fmt] [--output=ofmt] [--backing-chain] filename")
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STEXI
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303
qemu-img.c
303
qemu-img.c
@ -166,7 +166,14 @@ static void QEMU_NORETURN help(void)
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"Parameters to compare subcommand:\n"
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" '-f' first image format\n"
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" '-F' second image format\n"
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" '-s' run in Strict mode - fail on different image size or sector allocation\n";
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" '-s' run in Strict mode - fail on different image size or sector allocation\n"
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"\n"
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"Parameters to dd subcommand:\n"
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" 'bs=BYTES' read and write up to BYTES bytes at a time "
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"(default: 512)\n"
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" 'count=N' copy only N input blocks\n"
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" 'if=FILE' read from FILE\n"
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" 'of=FILE' write to FILE\n";
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printf("%s\nSupported formats:", help_msg);
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bdrv_iterate_format(format_print, NULL);
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@ -3796,6 +3803,300 @@ out:
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return 0;
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}
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#define C_BS 01
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#define C_COUNT 02
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#define C_IF 04
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#define C_OF 010
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struct DdInfo {
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unsigned int flags;
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int64_t count;
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};
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struct DdIo {
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int bsz; /* Block size */
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char *filename;
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uint8_t *buf;
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};
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struct DdOpts {
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const char *name;
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int (*f)(const char *, struct DdIo *, struct DdIo *, struct DdInfo *);
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unsigned int flag;
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};
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static int img_dd_bs(const char *arg,
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struct DdIo *in, struct DdIo *out,
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struct DdInfo *dd)
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{
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char *end;
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int64_t res;
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res = qemu_strtosz_suffix(arg, &end, QEMU_STRTOSZ_DEFSUFFIX_B);
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if (res <= 0 || res > INT_MAX || *end) {
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error_report("invalid number: '%s'", arg);
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return 1;
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}
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in->bsz = out->bsz = res;
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return 0;
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}
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static int img_dd_count(const char *arg,
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struct DdIo *in, struct DdIo *out,
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struct DdInfo *dd)
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{
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char *end;
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dd->count = qemu_strtosz_suffix(arg, &end, QEMU_STRTOSZ_DEFSUFFIX_B);
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if (dd->count < 0 || *end) {
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error_report("invalid number: '%s'", arg);
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return 1;
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}
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return 0;
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}
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static int img_dd_if(const char *arg,
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struct DdIo *in, struct DdIo *out,
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struct DdInfo *dd)
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{
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in->filename = g_strdup(arg);
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return 0;
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}
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static int img_dd_of(const char *arg,
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struct DdIo *in, struct DdIo *out,
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struct DdInfo *dd)
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{
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out->filename = g_strdup(arg);
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return 0;
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}
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static int img_dd(int argc, char **argv)
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{
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int ret = 0;
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char *arg = NULL;
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char *tmp;
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BlockDriver *drv = NULL, *proto_drv = NULL;
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BlockBackend *blk1 = NULL, *blk2 = NULL;
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QemuOpts *opts = NULL;
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QemuOptsList *create_opts = NULL;
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Error *local_err = NULL;
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bool image_opts = false;
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int c, i;
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const char *out_fmt = "raw";
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const char *fmt = NULL;
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int64_t size = 0;
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int64_t block_count = 0, out_pos, in_pos;
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struct DdInfo dd = {
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.flags = 0,
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.count = 0,
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};
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struct DdIo in = {
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.bsz = 512, /* Block size is by default 512 bytes */
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.filename = NULL,
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.buf = NULL
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};
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struct DdIo out = {
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.bsz = 512,
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.filename = NULL,
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.buf = NULL
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};
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const struct DdOpts options[] = {
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{ "bs", img_dd_bs, C_BS },
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{ "count", img_dd_count, C_COUNT },
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{ "if", img_dd_if, C_IF },
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{ "of", img_dd_of, C_OF },
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{ NULL, NULL, 0 }
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};
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const struct option long_options[] = {
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{ "help", no_argument, 0, 'h'},
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{ "image-opts", no_argument, 0, OPTION_IMAGE_OPTS},
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{ 0, 0, 0, 0 }
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};
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while ((c = getopt_long(argc, argv, "hf:O:", long_options, NULL))) {
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if (c == EOF) {
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break;
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}
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switch (c) {
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case 'O':
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out_fmt = optarg;
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break;
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case 'f':
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fmt = optarg;
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break;
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case '?':
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error_report("Try 'qemu-img --help' for more information.");
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ret = -1;
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goto out;
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case 'h':
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help();
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break;
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case OPTION_IMAGE_OPTS:
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image_opts = true;
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break;
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}
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}
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for (i = optind; i < argc; i++) {
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int j;
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arg = g_strdup(argv[i]);
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tmp = strchr(arg, '=');
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if (tmp == NULL) {
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error_report("unrecognized operand %s", arg);
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ret = -1;
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goto out;
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}
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*tmp++ = '\0';
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for (j = 0; options[j].name != NULL; j++) {
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if (!strcmp(arg, options[j].name)) {
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break;
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}
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}
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if (options[j].name == NULL) {
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error_report("unrecognized operand %s", arg);
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ret = -1;
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goto out;
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}
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if (options[j].f(tmp, &in, &out, &dd) != 0) {
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ret = -1;
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goto out;
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}
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dd.flags |= options[j].flag;
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g_free(arg);
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arg = NULL;
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}
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if (!(dd.flags & C_IF && dd.flags & C_OF)) {
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error_report("Must specify both input and output files");
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ret = -1;
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goto out;
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}
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blk1 = img_open(image_opts, in.filename, fmt, 0, false, false);
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if (!blk1) {
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ret = -1;
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goto out;
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}
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drv = bdrv_find_format(out_fmt);
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if (!drv) {
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error_report("Unknown file format");
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ret = -1;
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goto out;
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}
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proto_drv = bdrv_find_protocol(out.filename, true, &local_err);
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if (!proto_drv) {
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error_report_err(local_err);
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ret = -1;
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goto out;
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}
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if (!drv->create_opts) {
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error_report("Format driver '%s' does not support image creation",
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drv->format_name);
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ret = -1;
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goto out;
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}
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if (!proto_drv->create_opts) {
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error_report("Protocol driver '%s' does not support image creation",
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proto_drv->format_name);
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ret = -1;
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goto out;
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}
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create_opts = qemu_opts_append(create_opts, drv->create_opts);
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create_opts = qemu_opts_append(create_opts, proto_drv->create_opts);
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opts = qemu_opts_create(create_opts, NULL, 0, &error_abort);
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size = blk_getlength(blk1);
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if (size < 0) {
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error_report("Failed to get size for '%s'", in.filename);
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ret = -1;
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goto out;
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}
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if (dd.flags & C_COUNT && dd.count <= INT64_MAX / in.bsz &&
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dd.count * in.bsz < size) {
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size = dd.count * in.bsz;
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}
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qemu_opt_set_number(opts, BLOCK_OPT_SIZE, size, &error_abort);
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ret = bdrv_create(drv, out.filename, opts, &local_err);
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if (ret < 0) {
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error_reportf_err(local_err,
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"%s: error while creating output image: ",
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out.filename);
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ret = -1;
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goto out;
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}
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blk2 = img_open(image_opts, out.filename, out_fmt, BDRV_O_RDWR,
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false, false);
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if (!blk2) {
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ret = -1;
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goto out;
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}
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in.buf = g_new(uint8_t, in.bsz);
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for (in_pos = 0, out_pos = 0; in_pos < size; block_count++) {
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int in_ret, out_ret;
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if (in_pos + in.bsz > size) {
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in_ret = blk_pread(blk1, in_pos, in.buf, size - in_pos);
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} else {
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in_ret = blk_pread(blk1, in_pos, in.buf, in.bsz);
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}
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if (in_ret < 0) {
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error_report("error while reading from input image file: %s",
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strerror(-in_ret));
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ret = -1;
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goto out;
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}
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in_pos += in_ret;
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out_ret = blk_pwrite(blk2, out_pos, in.buf, in_ret, 0);
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if (out_ret < 0) {
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error_report("error while writing to output image file: %s",
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strerror(-out_ret));
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ret = -1;
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goto out;
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}
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out_pos += out_ret;
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}
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out:
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g_free(arg);
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qemu_opts_del(opts);
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qemu_opts_free(create_opts);
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blk_unref(blk1);
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blk_unref(blk2);
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g_free(in.filename);
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g_free(out.filename);
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g_free(in.buf);
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g_free(out.buf);
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if (ret) {
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return 1;
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}
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return 0;
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}
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static const img_cmd_t img_cmds[] = {
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#define DEF(option, callback, arg_string) \
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@ -139,6 +139,20 @@ Parameters to convert subcommand:
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Skip the creation of the target volume
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@end table
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Parameters to dd subcommand:
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@table @option
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@item bs=@var{block_size}
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defines the block size
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@item count=@var{blocks}
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sets the number of input blocks to copy
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@item if=@var{input}
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sets the input file
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@item of=@var{output}
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sets the output file
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@end table
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Command description:
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@table @option
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@ -310,6 +324,17 @@ skipped. This is useful for formats such as @code{rbd} if the target
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volume has already been created with site specific options that cannot
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be supplied through qemu-img.
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@item dd [-f @var{fmt}] [-O @var{output_fmt}] [bs=@var{block_size}] [count=@var{blocks}] if=@var{input} of=@var{output}
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Dd copies from @var{input} file to @var{output} file converting it from
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@var{fmt} format to @var{output_fmt} format.
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The data is by default read and written using blocks of 512 bytes but can be
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modified by specifying @var{block_size}. If count=@var{blocks} is specified
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dd will stop reading input after reading @var{blocks} input blocks.
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The size syntax is similar to dd(1)'s size syntax.
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@item info [-f @var{fmt}] [--output=@var{ofmt}] [--backing-chain] @var{filename}
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Give information about the disk image @var{filename}. Use it in
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70
tests/qemu-iotests/159
Executable file
70
tests/qemu-iotests/159
Executable file
@ -0,0 +1,70 @@
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#! /bin/bash
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#
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# qemu-img dd test with different block sizes
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#
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# Copyright (C) 2016 Reda Sallahi
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#
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# This program is free software; you can redistribute it and/or modify
|
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# it under the terms of the GNU General Public License as published by
|
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# the Free Software Foundation; either version 2 of the License, or
|
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# (at your option) any later version.
|
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#
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# This program is distributed in the hope that it will be useful,
|
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
# GNU General Public License for more details.
|
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#
|
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# You should have received a copy of the GNU General Public License
|
||||
# along with this program. If not, see <http://www.gnu.org/licenses/>.
|
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#
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owner=fullmanet@gmail.com
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seq="$(basename $0)"
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echo "QA output created by $seq"
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here="$PWD"
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status=1
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_cleanup()
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{
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_cleanup_test_img
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rm -f "$TEST_IMG.out"
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}
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trap "_cleanup; exit \$status" 0 1 2 3 15
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. ./common.rc
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. ./common.filter
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. ./common.pattern
|
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_supported_fmt generic
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_supported_proto file
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_supported_os Linux
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TEST_SIZES="5 512 1024 1999 1K 64K 1M"
|
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for bs in $TEST_SIZES; do
|
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echo
|
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echo "== Creating image =="
|
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|
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size=1M
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_make_test_img $size
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_check_test_img
|
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$QEMU_IO -c "write -P 0xa 0 $size" "$TEST_IMG" | _filter_qemu_io
|
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|
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echo
|
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echo "== Converting the image with dd with a block size of $bs =="
|
||||
|
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$QEMU_IMG dd if="$TEST_IMG" of="$TEST_IMG.out" bs=$bs -O "$IMGFMT"
|
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TEST_IMG="$TEST_IMG.out" _check_test_img
|
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|
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echo
|
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echo "== Compare the images with qemu-img compare =="
|
||||
|
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$QEMU_IMG compare "$TEST_IMG" "$TEST_IMG.out"
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done
|
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|
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echo
|
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echo "*** done"
|
||||
rm -f "$seq.full"
|
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status=0
|
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87
tests/qemu-iotests/159.out
Normal file
87
tests/qemu-iotests/159.out
Normal file
@ -0,0 +1,87 @@
|
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QA output created by 159
|
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|
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== Creating image ==
|
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Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576
|
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No errors were found on the image.
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wrote 1048576/1048576 bytes at offset 0
|
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1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
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|
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== Converting the image with dd with a block size of 5 ==
|
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No errors were found on the image.
|
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|
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== Compare the images with qemu-img compare ==
|
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Images are identical.
|
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|
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== Creating image ==
|
||||
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576
|
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No errors were found on the image.
|
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wrote 1048576/1048576 bytes at offset 0
|
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1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
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|
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== Converting the image with dd with a block size of 512 ==
|
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No errors were found on the image.
|
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|
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== Compare the images with qemu-img compare ==
|
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Images are identical.
|
||||
|
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== Creating image ==
|
||||
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576
|
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No errors were found on the image.
|
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wrote 1048576/1048576 bytes at offset 0
|
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1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
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|
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== Converting the image with dd with a block size of 1024 ==
|
||||
No errors were found on the image.
|
||||
|
||||
== Compare the images with qemu-img compare ==
|
||||
Images are identical.
|
||||
|
||||
== Creating image ==
|
||||
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576
|
||||
No errors were found on the image.
|
||||
wrote 1048576/1048576 bytes at offset 0
|
||||
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
||||
|
||||
== Converting the image with dd with a block size of 1999 ==
|
||||
No errors were found on the image.
|
||||
|
||||
== Compare the images with qemu-img compare ==
|
||||
Images are identical.
|
||||
|
||||
== Creating image ==
|
||||
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576
|
||||
No errors were found on the image.
|
||||
wrote 1048576/1048576 bytes at offset 0
|
||||
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
||||
|
||||
== Converting the image with dd with a block size of 1K ==
|
||||
No errors were found on the image.
|
||||
|
||||
== Compare the images with qemu-img compare ==
|
||||
Images are identical.
|
||||
|
||||
== Creating image ==
|
||||
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576
|
||||
No errors were found on the image.
|
||||
wrote 1048576/1048576 bytes at offset 0
|
||||
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
||||
|
||||
== Converting the image with dd with a block size of 64K ==
|
||||
No errors were found on the image.
|
||||
|
||||
== Compare the images with qemu-img compare ==
|
||||
Images are identical.
|
||||
|
||||
== Creating image ==
|
||||
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576
|
||||
No errors were found on the image.
|
||||
wrote 1048576/1048576 bytes at offset 0
|
||||
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
||||
|
||||
== Converting the image with dd with a block size of 1M ==
|
||||
No errors were found on the image.
|
||||
|
||||
== Compare the images with qemu-img compare ==
|
||||
Images are identical.
|
||||
|
||||
*** done
|
||||
67
tests/qemu-iotests/170
Executable file
67
tests/qemu-iotests/170
Executable file
@ -0,0 +1,67 @@
|
||||
#! /bin/bash
|
||||
#
|
||||
# qemu-img dd test
|
||||
#
|
||||
# Copyright (C) 2016 Reda Sallahi
|
||||
#
|
||||
# This program is free software; you can redistribute it and/or modify
|
||||
# it under the terms of the GNU General Public License as published by
|
||||
# the Free Software Foundation; either version 2 of the License, or
|
||||
# (at your option) any later version.
|
||||
#
|
||||
# This program is distributed in the hope that it will be useful,
|
||||
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
# GNU General Public License for more details.
|
||||
#
|
||||
# You should have received a copy of the GNU General Public License
|
||||
# along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||
#
|
||||
|
||||
owner=fullmanet@gmail.com
|
||||
|
||||
seq="$(basename $0)"
|
||||
echo "QA output created by $seq"
|
||||
|
||||
here="$PWD"
|
||||
status=1
|
||||
|
||||
_cleanup()
|
||||
{
|
||||
_cleanup_test_img
|
||||
rm -f "$TEST_IMG.out"
|
||||
}
|
||||
trap "_cleanup; exit \$status" 0 1 2 3 15
|
||||
|
||||
. ./common.rc
|
||||
. ./common.filter
|
||||
. ./common.pattern
|
||||
|
||||
_supported_fmt generic
|
||||
_supported_proto file
|
||||
_supported_os Linux
|
||||
|
||||
echo
|
||||
echo "== Creating image =="
|
||||
|
||||
size=1M
|
||||
_make_test_img $size
|
||||
_check_test_img
|
||||
|
||||
$QEMU_IO -c "write -P 0xa 0 $size" "$TEST_IMG" | _filter_qemu_io
|
||||
|
||||
echo
|
||||
echo "== Converting the image with dd =="
|
||||
|
||||
$QEMU_IMG dd if="$TEST_IMG" of="$TEST_IMG.out" -O "$IMGFMT"
|
||||
TEST_IMG="$TEST_IMG.out" _check_test_img
|
||||
|
||||
echo
|
||||
echo "== Compare the images with qemu-img compare =="
|
||||
|
||||
$QEMU_IMG compare "$TEST_IMG" "$TEST_IMG.out"
|
||||
|
||||
echo
|
||||
echo "*** done"
|
||||
rm -f "$seq.full"
|
||||
status=0
|
||||
15
tests/qemu-iotests/170.out
Normal file
15
tests/qemu-iotests/170.out
Normal file
@ -0,0 +1,15 @@
|
||||
QA output created by 170
|
||||
|
||||
== Creating image ==
|
||||
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576
|
||||
No errors were found on the image.
|
||||
wrote 1048576/1048576 bytes at offset 0
|
||||
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
||||
|
||||
== Converting the image with dd ==
|
||||
No errors were found on the image.
|
||||
|
||||
== Compare the images with qemu-img compare ==
|
||||
Images are identical.
|
||||
|
||||
*** done
|
||||
@ -44,6 +44,15 @@ _filter_imgfmt()
|
||||
sed -e "s#$IMGFMT#IMGFMT#g"
|
||||
}
|
||||
|
||||
# Replace error message when the format is not supported and delete
|
||||
# the output lines after the first one
|
||||
_filter_qemu_img_check()
|
||||
{
|
||||
sed -e '/allocated.*fragmented.*compressed clusters/d' \
|
||||
-e 's/qemu-img: This image format does not support checks/No errors were found on the image./' \
|
||||
-e '/Image end offset: [0-9]\+/d'
|
||||
}
|
||||
|
||||
# Removes \r from messages
|
||||
_filter_win32()
|
||||
{
|
||||
|
||||
@ -234,10 +234,7 @@ _check_test_img()
|
||||
else
|
||||
$QEMU_IMG check "$@" -f $IMGFMT "$TEST_IMG" 2>&1
|
||||
fi
|
||||
) | _filter_testdir | \
|
||||
sed -e '/allocated.*fragmented.*compressed clusters/d' \
|
||||
-e 's/qemu-img: This image format does not support checks/No errors were found on the image./' \
|
||||
-e '/Image end offset: [0-9]\+/d'
|
||||
) | _filter_testdir | _filter_qemu_img_check
|
||||
}
|
||||
|
||||
_img_info()
|
||||
|
||||
@ -157,4 +157,6 @@
|
||||
155 rw auto
|
||||
156 rw auto quick
|
||||
157 auto
|
||||
159 rw auto quick
|
||||
162 auto quick
|
||||
170 rw auto quick
|
||||
|
||||
Loading…
Reference in New Issue
Block a user