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[Qemu-devel] [PATCH RFC 1/1] qemu-img: add the 'dd' subcommand
|
From: |
Reda Sallahi |
|
Subject: |
[Qemu-devel] [PATCH RFC 1/1] qemu-img: add the 'dd' subcommand |
|
Date: |
Wed, 22 Jun 2016 19:21:30 +0200 |
|
User-agent: |
Mutt/1.6.1 (2016-04-27) |
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.
get_size() and get_offset() were needed for the size syntax dd(1) supports
which is different from qemu_strtosz_suffix.
Signed-off-by: Reda Sallahi <address@hidden>
---
qemu-img-cmds.hx | 6 +
qemu-img.c | 833 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 838 insertions(+), 1 deletion(-)
diff --git a/qemu-img-cmds.hx b/qemu-img-cmds.hx
index 7e95b2d..68f81b0 100644
--- a/qemu-img-cmds.hx
+++ b/qemu-img-cmds.hx
@@ -45,6 +45,12 @@ STEXI
@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} address@hidden [...]] @var{output_filename}
ETEXI
+DEF("dd", img_dd,
+ "dd [--image-opts] [-f fmt] [-O output_fmt] [bs=block_size]
[ibs=in_block_size] [count=blocks] if=input of=output")
+STEXI
address@hidden dd [--image-opts] [-f @var{fmt}] [-O @var{output_fmt}]
address@hidden address@hidden address@hidden address@hidden address@hidden
+ETEXI
+
DEF("info", img_info,
"info [--object objectdef] [--image-opts] [-f fmt] [--output=ofmt]
[--backing-chain] filename")
STEXI
diff --git a/qemu-img.c b/qemu-img.c
index 14e2661..dace76b 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -159,7 +159,25 @@ static void QEMU_NORETURN help(void)
"Parameters to compare subcommand:\n"
" '-f' first image format\n"
" '-F' second image format\n"
- " '-s' run in Strict mode - fail on different image size or sector
allocation\n";
+ " '-s' run in Strict mode - fail on different image size or sector
allocation\n"
+ "\n"
+ "Parameters to dd subcommand:\n"
+ " 'bs=BYTES' read and write up to BYTES bytes at a time\n"
+/* " 'cbs=BYTES' convert BYTES bytes at a time\n"
+ " 'conv=CONVS' convert the file as per the comma separated "
+ "symbol list\n" */
+ " 'count=N' copy only N input blocks\n"
+ " 'ibs=BYTES' read up to BYTES bytes at a time (default: 512)\n"
+ " 'if=FILE' read from FILE instead of stdin\n"
+ " 'obs=BYTES' write BYTES bytes at a time (default: 512)\n"
+ " 'of=FILE' write to FILE instead of stdout\n";
+/* " 'seek=N' skip N obs-sized blocks at start of output\n"
+ " 'skip=N' skip N ibs-sized blocks at start of input\n"
+ " 'status=LEVEL' The LEVEL of information to print to stderr; "
+ "'none' suppresses everything but error messages, 'noxfer' "
+ "suppresses the final transfer statistics, 'progress' shows "
+ "periodic transfer statistics\n" */
+
printf("%s\nSupported formats:", help_msg);
bdrv_iterate_format(format_print, NULL);
@@ -3788,6 +3806,819 @@ out:
return 0;
}
+#define C_BS 01
+#define C_CBS 02
+#define C_CONV 04
+#define C_COUNT 010
+#define C_IBS 020
+#define C_IF 040
+#define C_IFLAG 0100
+#define C_OBS 0200
+#define C_OF 0400
+#define C_OFLAG 01000
+#define C_SEEK 02000
+#define C_SKIP 04000
+#define C_STATUS 010000
+
+struct DdEss {
+ unsigned int flags;
+ unsigned int status;
+ unsigned int conv;
+ size_t count;
+ size_t cbsz; /* Conversion block size */
+};
+
+struct DdIo {
+ size_t bsz; /* Block size */
+ off_t offset;
+ const char *filename;
+ unsigned int flags;
+ uint8_t *buf;
+};
+
+struct DdOpts {
+ const char *name;
+ int (*f)(const char *, struct DdIo *, struct DdIo *, struct DdEss *);
+ unsigned int flag;
+};
+
+static size_t get_size(const char *str)
+{
+ /* XXX: handle {k,m,g}B notations */
+ unsigned long num;
+ size_t res = 0;
+ const char *buf;
+
+ errno = 0;
+ qemu_strtoul(str, &buf, 0, &num);
+
+ if (num == ULONG_MAX && errno == ERANGE) {
+ error_report("invalid number: %s", str);
+ return res;
+ }
+
+ switch (*buf) {
+ case '\0':
+ case 'c':
+ res = num;
+ break;
+ case 'w':
+ res = num * 2;
+ break;
+ case 'b':
+ res = num * 512;
+ break;
+ case 'K':
+ res = num * 1024;
+ break;
+ case 'M':
+ res = num * 1024 * 1024;
+ break;
+ case 'G':
+ res = num * 1024 * 1024 * 1024;
+ break;
+ case 'T':
+ res = num * 1024 * 1024 * 1024 * 1024;
+ break;
+ case 'P':
+ res = num * 1024 * 1024 * 1024 * 1024 * 1024;
+ break;
+ case 'E':
+ res = num * 1024 * 1024 * 1024 * 1024 * 1024 * 1024;
+ break;
+ case 'Z':
+ res = num * 1024 * 1024 * 1024 * 1024 * 1024 * 1024 * 1024;
+ break;
+ case 'Y':
+ res = num * 1024 * 1024 * 1024 * 1024 * 1024 * 1024 * 1024 * 1024;
+ break;
+ default:
+ error_report("invalid number: '%s'", str);
+ errno = EINVAL;
+ }
+
+ return res;
+
+}
+
+static off_t get_offset(const char *str)
+{
+ /* XXX handle {k,m,g}B notations */
+ off_t res = 0;
+ long num;
+ const char *buf;
+
+ errno = 0;
+ qemu_strtol(str, &buf, 0, &num);
+
+ if (errno == ERANGE) {
+ error_report("invalid number: '%s'", str);
+ return res;
+ }
+
+ switch (*buf) {
+ case '\0':
+ case 'c':
+ res = num;
+ break;
+ case 'w':
+ res = num * 2;
+ break;
+ case 'b':
+ res = num * 512;
+ break;
+ case 'K':
+ res = num * 1024;
+ break;
+ case 'M':
+ res = num * 1024 * 1024;
+ break;
+ case 'G':
+ res = num * 1024 * 1024 * 1024;
+ break;
+ case 'T':
+ res = num * 1024 * 1024 * 1024 * 1024;
+ break;
+ case 'P':
+ res = num * 1024 * 1024 * 1024 * 1024 * 1024;
+ break;
+ case 'E':
+ res = num * 1024 * 1024 * 1024 * 1024 * 1024 * 1024;
+ break;
+ case 'Z':
+ res = num * 1024 * 1024 * 1024 * 1024 * 1024 * 1024 * 1024;
+ break;
+ case 'Y':
+ res = num * 1024 * 1024 * 1024 * 1024 * 1024 * 1024 * 1024 * 1024;
+ break;
+ default:
+ error_report("invalid number: '%s'", str);
+ errno = EINVAL;
+ }
+
+ return res;
+}
+
+static int img_dd_bs(const char *arg,
+ struct DdIo *in, struct DdIo *out,
+ struct DdEss *dd)
+{
+ if (strchr(arg, '-')) {
+ error_report("invalid number: '%s'", arg);
+ return 1;
+ }
+
+ in->bsz = out->bsz = get_size(arg);
+
+ if (in->bsz == 0 && (errno == EINVAL || errno == ERANGE)) {
+ return 1;
+ }
+ if (in->bsz == 0) {
+ error_report("invalid number: '%s'", arg);
+ return 1;
+ }
+
+
+ return 0;
+}
+
+static int img_dd_cbs(const char *arg,
+ struct DdIo *in, struct DdIo *out,
+ struct DdEss *dd)
+{
+ if (strchr(arg, '-')) {
+ error_report("invalid number: '%s'", arg);
+ return 1;
+ }
+
+ dd->cbsz = get_size(arg);
+
+ if (dd->cbsz == 0 && (errno == EINVAL || errno == ERANGE)) {
+ return 1;
+ }
+ if (dd->cbsz == 0) {
+ error_report("invalid number: '%s'", arg);
+ return 1;
+ }
+
+
+ return 0;
+}
+
+struct DdSymbols {
+ const char *name;
+ unsigned int value;
+};
+
+#define C_ASCII 01
+#define C_EBCDIC 02
+#define C_IBM 04
+#define C_BLOCK 010
+#define C_UNBLOCK 020
+#define C_LCASE 040
+#define C_UCASE 0100
+#define C_SPARSE 0200
+#define C_SWAB 0400
+#define C_SYNC 01000
+#define C_EXCL 02000
+#define C_NOCREAT 04000
+#define C_NOTRUNC 010000
+#define C_NOERROR 020000
+#define C_FDATASYNC 040000
+#define C_FSYNC 0100000
+
+static int img_dd_conv(const char *arg,
+ struct DdIo *in, struct DdIo *out,
+ struct DdEss *dd)
+{
+ const char *tok;
+ char *str, *tmp;
+ int ret = 0;
+ const struct DdSymbols conv[] = {
+ { "ascii", C_ASCII },
+ { "ebcdic", C_EBCDIC },
+ { "ibm", C_IBM },
+ { "block", C_BLOCK },
+ { "unblock", C_UNBLOCK },
+ { "lcase", C_LCASE },
+ { "ucase", C_UCASE },
+ { "sparse", C_SPARSE },
+ { "sync", C_SYNC },
+ { "excl", C_EXCL },
+ { "nocreat", C_NOCREAT },
+ { "notrunc", C_NOTRUNC },
+ { "noerror", C_NOERROR },
+ { "fdatasync", C_FDATASYNC },
+ { "fsync", C_FSYNC },
+ { NULL, 0 }
+ };
+
+ tmp = str = g_strdup(arg);
+
+ while (tmp != NULL && !ret) {
+ tok = qemu_strsep(&tmp, ",");
+ int j;
+ for (j = 0; conv[j].name != NULL; j++) {
+ if (!strcmp(tok, conv[j].name)) {
+ dd->conv |= conv[j].value;
+ break;
+ }
+ }
+ if (conv[j].name == NULL) {
+ error_report("invalid conversion: '%s'", tok);
+ ret = 1;
+ }
+ }
+
+ g_free(str);
+ return ret;
+}
+
+static int img_dd_count(const char *arg,
+ struct DdIo *in, struct DdIo *out,
+ struct DdEss *dd)
+{
+ if (strchr(arg, '-')) {
+ error_report("invalid number: '%s'", arg);
+ return 1;
+ }
+
+ dd->count = get_size(arg);
+
+ if (dd->count == 0 && (errno == EINVAL || errno == ERANGE)) {
+ return 1;
+ }
+
+ return 0;
+}
+
+static int img_dd_ibs(const char *arg,
+ struct DdIo *in, struct DdIo *out,
+ struct DdEss *dd)
+{
+ if (strchr(arg, '-')) {
+ error_report("invalid number: '%s'", arg);
+ return 1;
+ }
+
+ in->bsz = get_size(arg);
+
+ if (in->bsz == 0 && (errno == EINVAL || errno == ERANGE)) {
+ return 1;
+ }
+ if (in->bsz == 0) {
+ error_report("invalid number: '%s'", arg);
+ return 1;
+ }
+
+ return 0;
+}
+
+static int img_dd_if(const char *arg,
+ struct DdIo *in, struct DdIo *out,
+ struct DdEss *dd)
+{
+ in->filename = arg;
+
+ return 0;
+}
+
+#define C_APPEND 01
+#define C_DIRECT 02
+#define C_DIRECTORY 04
+#define C_DSYNC 010
+#define C_SYNC_FLAG 020
+#define C_FULLBLOCK 040
+#define C_NONBLOCK 0100
+#define C_NOATIME 0200
+#define C_NOCACHE 0400
+#define C_NOCTTY 01000
+#define C_NOFOLLOW 02000
+#define C_COUNT_BYTES 04000
+#define C_SKIP_BYTES 010000
+#define C_SEEK_BYTES 020000
+
+static int img_dd_iflag(const char *arg,
+ struct DdIo *in, struct DdIo *out,
+ struct DdEss *dd)
+{
+ const struct DdSymbols flags[] = {
+ { "direct", C_DIRECT },
+ { "directory", C_DIRECTORY },
+ { "dsync", C_DSYNC },
+ { "sync", C_SYNC_FLAG },
+ { "fullblock", C_FULLBLOCK },
+ { "nonblock", C_NONBLOCK },
+ { "noatime", C_NOATIME },
+ { "nocache", C_NOCACHE },
+ { "noctty", C_NOCTTY },
+ { "nofollow", C_NOFOLLOW },
+ { "count_bytes", C_COUNT_BYTES },
+ { "skip_bytes", C_SKIP_BYTES },
+ { NULL, 0}
+ };
+
+ for (int j = 0; flags[j].name != NULL; j++) {
+ if (!strcmp(arg, flags[j].name)) {
+ in->flags = flags[j].value;
+ return 0;
+ }
+ }
+
+ error_report("invalid input flag: '%s'", arg);
+ return 1;
+}
+
+static int img_dd_obs(const char *arg,
+ struct DdIo *in, struct DdIo *out,
+ struct DdEss *dd)
+{
+ if (strchr(arg, '-')) {
+ error_report("invalid number: '%s'", arg);
+ return 1;
+ }
+
+ out->bsz = get_size(arg);
+
+ if (out->bsz == 0 && (errno == EINVAL || errno == ERANGE)) {
+ return 1;
+ }
+ if (out->bsz == 0) {
+ error_report("invalid number: '%s'", arg);
+ return 1;
+ }
+
+
+ return 0;
+}
+
+static int img_dd_of(const char *arg,
+ struct DdIo *in, struct DdIo *out,
+ struct DdEss *dd)
+{
+ out->filename = arg;
+
+ return 0;
+}
+
+static int img_dd_oflag(const char *arg,
+ struct DdIo *in, struct DdIo *out,
+ struct DdEss *dd)
+{
+ const struct DdSymbols flags[] = {
+ { "append", C_APPEND },
+ { "direct", C_DIRECT },
+ { "directory", C_DIRECTORY },
+ { "dsync", C_DSYNC },
+ { "sync", C_SYNC_FLAG },
+ { "nonblock", C_NONBLOCK },
+ { "noatime", C_NOATIME },
+ { "nocache", C_NOCACHE },
+ { "noctty", C_NOCTTY },
+ { "nofollow", C_NOFOLLOW },
+ { "seek_bytes", C_SEEK_BYTES },
+ { NULL, 0 }
+ };
+
+ for (int j = 0; flags[j].name != NULL; j++) {
+ if (!strcmp(arg, flags[j].name)) {
+ out->flags = flags[j].value;
+ return 0;
+ }
+ }
+
+ error_report("invalid output flag: '%s'", arg);
+ return 1;
+}
+
+static int img_dd_seek(const char *arg,
+ struct DdIo *in, struct DdIo *out,
+ struct DdEss *dd)
+{
+ out->offset = get_offset(arg);
+
+ if (out->offset == 0 && (errno == EINVAL || errno == ERANGE)) {
+ return 1;
+ }
+
+ return 0;
+}
+
+static int img_dd_skip(const char *arg,
+ struct DdIo *in, struct DdIo *out,
+ struct DdEss *dd)
+{
+ in->offset = get_offset(arg);
+
+ if (in->offset == 0 && (errno == EINVAL || errno == ERANGE)) {
+ return 1;
+ }
+
+ return 0;
+}
+
+#define C_STATUS_DEFAULT 00
+#define C_STATUS_NONE 01
+#define C_STATUS_NOXFER 02
+#define C_STATUS_PROGRESS 04
+
+static int img_dd_status(const char *arg,
+ struct DdIo *in, struct DdIo *out,
+ struct DdEss *dd)
+{
+ const struct DdSymbols dd_status[] = {
+ { "none", C_STATUS_NONE },
+ { "noxfer", C_STATUS_NOXFER },
+ { "progress", C_STATUS_PROGRESS },
+ { "default", C_STATUS_DEFAULT },
+ { NULL, 0 }
+ };
+
+ for (int j = 0; dd_status[j].name != NULL; j++) {
+ if (!strcmp(arg, dd_status[j].name)) {
+ dd->status = dd_status[j].value;
+ return 0;
+ }
+ }
+
+ error_report("invalid status level: '%s'", arg);
+ return 1;
+}
+
+/* Conversion table for later user for the conv option.
+
+static char const ascii_to_ebcdic[] =
+{
+ '\000', '\001', '\002', '\003', '\067', '\055', '\056', '\057',
+ '\026', '\005', '\045', '\013', '\014', '\015', '\016', '\017',
+ '\020', '\021', '\022', '\023', '\074', '\075', '\062', '\046',
+ '\030', '\031', '\077', '\047', '\034', '\035', '\036', '\037',
+ '\100', '\132', '\177', '\173', '\133', '\154', '\120', '\175',
+ '\115', '\135', '\134', '\116', '\153', '\140', '\113', '\141',
+ '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
+ '\370', '\371', '\172', '\136', '\114', '\176', '\156', '\157',
+ '\174', '\301', '\302', '\303', '\304', '\305', '\306', '\307',
+ '\310', '\311', '\321', '\322', '\323', '\324', '\325', '\326',
+ '\327', '\330', '\331', '\342', '\343', '\344', '\345', '\346',
+ '\347', '\350', '\351', '\255', '\340', '\275', '\232', '\155',
+ '\171', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
+ '\210', '\211', '\221', '\222', '\223', '\224', '\225', '\226',
+ '\227', '\230', '\231', '\242', '\243', '\244', '\245', '\246',
+ '\247', '\250', '\251', '\300', '\117', '\320', '\137', '\007',
+ '\040', '\041', '\042', '\043', '\044', '\025', '\006', '\027',
+ '\050', '\051', '\052', '\053', '\054', '\011', '\012', '\033',
+ '\060', '\061', '\032', '\063', '\064', '\065', '\066', '\010',
+ '\070', '\071', '\072', '\073', '\004', '\024', '\076', '\341',
+ '\101', '\102', '\103', '\104', '\105', '\106', '\107', '\110',
+ '\111', '\121', '\122', '\123', '\124', '\125', '\126', '\127',
+ '\130', '\131', '\142', '\143', '\144', '\145', '\146', '\147',
+ '\150', '\151', '\160', '\161', '\162', '\163', '\164', '\165',
+ '\166', '\167', '\170', '\200', '\212', '\213', '\214', '\215',
+ '\216', '\217', '\220', '\152', '\233', '\234', '\235', '\236',
+ '\237', '\240', '\252', '\253', '\254', '\112', '\256', '\257',
+ '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
+ '\270', '\271', '\272', '\273', '\274', '\241', '\276', '\277',
+ '\312', '\313', '\314', '\315', '\316', '\317', '\332', '\333',
+ '\334', '\335', '\336', '\337', '\352', '\353', '\354', '\355',
+ '\356', '\357', '\372', '\373', '\374', '\375', '\376', '\377'
+};
+
+static char const ascii_to_ibm[] =
+{
+ '\000', '\001', '\002', '\003', '\067', '\055', '\056', '\057',
+ '\026', '\005', '\045', '\013', '\014', '\015', '\016', '\017',
+ '\020', '\021', '\022', '\023', '\074', '\075', '\062', '\046',
+ '\030', '\031', '\077', '\047', '\034', '\035', '\036', '\037',
+ '\100', '\132', '\177', '\173', '\133', '\154', '\120', '\175',
+ '\115', '\135', '\134', '\116', '\153', '\140', '\113', '\141',
+ '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
+ '\370', '\371', '\172', '\136', '\114', '\176', '\156', '\157',
+ '\174', '\301', '\302', '\303', '\304', '\305', '\306', '\307',
+ '\310', '\311', '\321', '\322', '\323', '\324', '\325', '\326',
+ '\327', '\330', '\331', '\342', '\343', '\344', '\345', '\346',
+ '\347', '\350', '\351', '\255', '\340', '\275', '\137', '\155',
+ '\171', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
+ '\210', '\211', '\221', '\222', '\223', '\224', '\225', '\226',
+ '\227', '\230', '\231', '\242', '\243', '\244', '\245', '\246',
+ '\247', '\250', '\251', '\300', '\117', '\320', '\241', '\007',
+ '\040', '\041', '\042', '\043', '\044', '\025', '\006', '\027',
+ '\050', '\051', '\052', '\053', '\054', '\011', '\012', '\033',
+ '\060', '\061', '\032', '\063', '\064', '\065', '\066', '\010',
+ '\070', '\071', '\072', '\073', '\004', '\024', '\076', '\341',
+ '\101', '\102', '\103', '\104', '\105', '\106', '\107', '\110',
+ '\111', '\121', '\122', '\123', '\124', '\125', '\126', '\127',
+ '\130', '\131', '\142', '\143', '\144', '\145', '\146', '\147',
+ '\150', '\151', '\160', '\161', '\162', '\163', '\164', '\165',
+ '\166', '\167', '\170', '\200', '\212', '\213', '\214', '\215',
+ '\216', '\217', '\220', '\232', '\233', '\234', '\235', '\236',
+ '\237', '\240', '\252', '\253', '\254', '\255', '\256', '\257',
+ '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
+ '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
+ '\312', '\313', '\314', '\315', '\316', '\317', '\332', '\333',
+ '\334', '\335', '\336', '\337', '\352', '\353', '\354', '\355',
+ '\356', '\357', '\372', '\373', '\374', '\375', '\376', '\377'
+};
+
+static char const ebcdic_to_ascii[] =
+{
+ '\000', '\001', '\002', '\003', '\234', '\011', '\206', '\177',
+ '\227', '\215', '\216', '\013', '\014', '\015', '\016', '\017',
+ '\020', '\021', '\022', '\023', '\235', '\205', '\010', '\207',
+ '\030', '\031', '\222', '\217', '\034', '\035', '\036', '\037',
+ '\200', '\201', '\202', '\203', '\204', '\012', '\027', '\033',
+ '\210', '\211', '\212', '\213', '\214', '\005', '\006', '\007',
+ '\220', '\221', '\026', '\223', '\224', '\225', '\226', '\004',
+ '\230', '\231', '\232', '\233', '\024', '\025', '\236', '\032',
+ '\040', '\240', '\241', '\242', '\243', '\244', '\245', '\246',
+ '\247', '\250', '\325', '\056', '\074', '\050', '\053', '\174',
+ '\046', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
+ '\260', '\261', '\041', '\044', '\052', '\051', '\073', '\176',
+ '\055', '\057', '\262', '\263', '\264', '\265', '\266', '\267',
+ '\270', '\271', '\313', '\054', '\045', '\137', '\076', '\077',
+ '\272', '\273', '\274', '\275', '\276', '\277', '\300', '\301',
+ '\302', '\140', '\072', '\043', '\100', '\047', '\075', '\042',
+ '\303', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
+ '\150', '\151', '\304', '\305', '\306', '\307', '\310', '\311',
+ '\312', '\152', '\153', '\154', '\155', '\156', '\157', '\160',
+ '\161', '\162', '\136', '\314', '\315', '\316', '\317', '\320',
+ '\321', '\345', '\163', '\164', '\165', '\166', '\167', '\170',
+ '\171', '\172', '\322', '\323', '\324', '\133', '\326', '\327',
+ '\330', '\331', '\332', '\333', '\334', '\335', '\336', '\337',
+ '\340', '\341', '\342', '\343', '\344', '\135', '\346', '\347',
+ '\173', '\101', '\102', '\103', '\104', '\105', '\106', '\107',
+ '\110', '\111', '\350', '\351', '\352', '\353', '\354', '\355',
+ '\175', '\112', '\113', '\114', '\115', '\116', '\117', '\120',
+ '\121', '\122', '\356', '\357', '\360', '\361', '\362', '\363',
+ '\134', '\237', '\123', '\124', '\125', '\126', '\127', '\130',
+ '\131', '\132', '\364', '\365', '\366', '\367', '\370', '\371',
+ '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
+ '\070', '\071', '\372', '\373', '\374', '\375', '\376', '\377'
+};
+*/
+
+
+static int img_dd(int argc, char **argv)
+{
+ int ret = 0;
+ char *arg = NULL;
+ char *tmp;
+ struct DdEss dd;
+ struct DdIo in, out;
+ BlockDriver *drv = NULL, *proto_drv = NULL;
+ BlockBackend *blk1 = NULL, *blk2 = NULL;
+ QemuOpts *opts = NULL;
+ QemuOptsList *create_opts = NULL;
+ Error *local_err = NULL;
+ bool image_opts = false;
+ int c;
+ const char *out_fmt = "raw";
+ const char *fmt = NULL;
+ int64_t size = 0;
+
+ dd.flags = 0;
+ dd.status = C_STATUS_DEFAULT;
+ dd.conv = 0;
+ dd.count = 0;
+ in.buf = out.buf = NULL;
+ dd.cbsz = in.bsz = out.bsz = 512; /* Block size is by default 512 bytes */
+
+ const struct DdOpts options[] = {
+ { "bs", img_dd_bs, C_BS },
+ { "cbs", img_dd_cbs, C_CBS },
+ { "conv", img_dd_conv, C_CONV },
+ { "count", img_dd_count, C_COUNT },
+ { "ibs", img_dd_ibs, C_IBS },
+ { "if", img_dd_if, C_IF },
+ { "iflag", img_dd_iflag, C_IFLAG },
+ { "obs", img_dd_obs, C_OBS },
+ { "of", img_dd_of, C_OF },
+ { "oflag", img_dd_oflag, C_OFLAG },
+ { "seek", img_dd_seek, C_SEEK },
+ { "skip", img_dd_skip, C_SKIP },
+ { "status", img_dd_status, C_STATUS },
+ { NULL, NULL, 0 }
+ };
+ const struct option long_options[] = {
+ { "help", no_argument, 0, 'h'},
+ { "image-opts", no_argument, 0, OPTION_IMAGE_OPTS},
+ { 0, 0, 0, 0 }
+ };
+
+ while ((c = getopt_long(argc, argv, "hf:O:", long_options, NULL))) {
+ if (c == EOF) {
+ break;
+ }
+ switch (c) {
+ case 'O':
+ out_fmt = optarg;
+ break;
+ case 'f':
+ fmt = optarg;
+ break;
+ case '?':
+ error_report("Try 'qemu-img --help' for more information.");
+ ret = -1;
+ goto out;
+ break;
+ case 'h':
+ help();
+ break;
+ case OPTION_IMAGE_OPTS:
+ image_opts = true;
+ break;
+ }
+ }
+
+ for (int i = optind; i < argc; i++) {
+ arg = g_strdup(argv[i]);
+
+ tmp = strchr(arg, '=');
+ if (tmp == NULL) {
+ error_report("unrecognized operand %s", arg);
+ ret = -1;
+ goto out;
+ }
+
+ *tmp++ = '\0';
+ int j;
+ for (j = 0; options[j].name != NULL; j++) {
+ if (!strcmp(arg, options[j].name)) {
+ break;
+ }
+ }
+ if (options[j].name == NULL) {
+ error_report("unrecognized operand %s", arg);
+ ret = -1;
+ goto out;
+ }
+
+ if (options[j].f(tmp, &in, &out, &dd) != 0) {
+ ret = -1;
+ goto out;
+ }
+ dd.flags |= options[j].flag;
+ }
+
+ if (dd.flags & C_IF && dd.flags & C_OF) {
+ blk1 = img_open(image_opts, in.filename, fmt, 0, false, true);
+
+ if (!blk1) {
+ error_report("failed to open '%s'", in.filename);
+ ret = -1;
+ goto out;
+ }
+
+ drv = bdrv_find_format(out_fmt);
+ if (!drv) {
+ error_report("Unknown file format");
+ ret = -1;
+ goto out;
+ }
+ proto_drv = bdrv_find_protocol(out.filename, true, &local_err);
+
+ if (!proto_drv) {
+ error_report_err(local_err);
+ ret = -1;
+ goto out;
+ }
+ if (!drv->create_opts) {
+ error_report("Format driver '%s' does not support image creation",
+ drv->format_name);
+ ret = -1;
+ goto out;
+ }
+ if (!proto_drv->create_opts) {
+ error_report("Protocol driver '%s' does not support image
creation",
+ proto_drv->format_name);
+ ret = -1;
+ goto out;
+ }
+ create_opts = qemu_opts_append(create_opts, drv->create_opts);
+ create_opts = qemu_opts_append(create_opts, proto_drv->create_opts);
+
+ opts = qemu_opts_create(create_opts, NULL, 0, &error_abort);
+
+ size = blk_getlength(blk1);
+
+ if (dd.flags & C_COUNT && dd.count * in.bsz < size) {
+ qemu_opt_set_number(opts, BLOCK_OPT_SIZE,
+ dd.count * in.bsz, &error_abort);
+ } else {
+ qemu_opt_set_number(opts, BLOCK_OPT_SIZE, size, &error_abort);
+ }
+
+ ret = bdrv_create(drv, out.filename, opts, &local_err);
+ if (ret < 0) {
+ error_reportf_err(local_err,
+ "%s: error while copying and converting raw: ",
+ out.filename);
+ ret = -1;
+ goto out;
+ }
+
+ blk2 = img_open(image_opts, out.filename, out_fmt, BDRV_O_RDWR,
+ false, true);
+
+ if (!blk2) {
+ error_report("failed to open '%s'", out.filename);
+ ret = -1;
+ goto out;
+ }
+
+ in.buf = g_new(uint8_t, in.bsz);
+ out.buf = g_new(uint8_t, out.bsz);
+
+ int64_t count, block_count;
+
+ for (count = 0, block_count = 0; count < size;
+ count += ret, block_count++) {
+ /* If the count option is specified. */
+ if (dd.flags & C_COUNT && block_count >= dd.count) {
+ break;
+ }
+
+ if (in.bsz + count > size) {
+ ret = blk_pread(blk1, count, in.buf, size - count);
+ } else {
+ ret = blk_pread(blk1, count, in.buf, in.bsz);
+ }
+
+ if (ret < 0) {
+ error_report("error while reading from input image file: %s",
+ strerror(-ret));
+ ret = -1;
+ goto out;
+ }
+ int out_ret = blk_pwrite(blk2, count, in.buf, ret, 0);
+
+ if (out_ret < 0) {
+ error_report("error while writing to output image file: %s",
+ strerror(-out_ret));
+ ret = -1;
+ goto out;
+ }
+ }
+
+ } else {
+ error_report("Must specify both input and output files");
+ ret = -1;
+ goto out;
+ }
+out:
+ g_free(arg);
+ qemu_opts_del(opts);
+ qemu_opts_free(create_opts);
+ blk_unref(blk1);
+ blk_unref(blk2);
+ g_free(in.buf);
+ g_free(out.buf);
+
+ if (ret) {
+ return 1;
+ }
+ return 0;
+}
+
static const img_cmd_t img_cmds[] = {
#define DEF(option, callback, arg_string) \
--
2.9.0
- [Qemu-devel] [PATCH RFC 1/1] qemu-img: add the 'dd' subcommand,
Reda Sallahi <=