new disk image layer
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1037 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/qemu-img.c b/qemu-img.c
new file mode 100644
index 0000000..480dff9
--- /dev/null
+++ b/qemu-img.c
@@ -0,0 +1,677 @@
+/*
+ * create a COW disk image
+ *
+ * Copyright (c) 2003 Fabrice Bellard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "vl.h"
+
+void *get_mmap_addr(unsigned long size)
+{
+ return NULL;
+}
+
+void qemu_free(void *ptr)
+{
+ free(ptr);
+}
+
+void *qemu_malloc(size_t size)
+{
+ return malloc(size);
+}
+
+void *qemu_mallocz(size_t size)
+{
+ void *ptr;
+ ptr = qemu_malloc(size);
+ if (!ptr)
+ return NULL;
+ memset(ptr, 0, size);
+ return ptr;
+}
+
+char *qemu_strdup(const char *str)
+{
+ char *ptr;
+ ptr = qemu_malloc(strlen(str) + 1);
+ if (!ptr)
+ return NULL;
+ strcpy(ptr, str);
+ return ptr;
+}
+
+void pstrcpy(char *buf, int buf_size, const char *str)
+{
+ int c;
+ char *q = buf;
+
+ if (buf_size <= 0)
+ return;
+
+ for(;;) {
+ c = *str++;
+ if (c == 0 || q >= buf + buf_size - 1)
+ break;
+ *q++ = c;
+ }
+ *q = '\0';
+}
+
+/* strcat and truncate. */
+char *pstrcat(char *buf, int buf_size, const char *s)
+{
+ int len;
+ len = strlen(buf);
+ if (len < buf_size)
+ pstrcpy(buf + len, buf_size - len, s);
+ return buf;
+}
+
+int strstart(const char *str, const char *val, const char **ptr)
+{
+ const char *p, *q;
+ p = str;
+ q = val;
+ while (*q != '\0') {
+ if (*p != *q)
+ return 0;
+ p++;
+ q++;
+ }
+ if (ptr)
+ *ptr = p;
+ return 1;
+}
+
+void term_printf(const char *fmt, ...)
+{
+ va_list ap;
+ va_start(ap, fmt);
+ vprintf(fmt, ap);
+ va_end(ap);
+}
+
+void __attribute__((noreturn)) error(const char *fmt, ...)
+{
+ va_list ap;
+ va_start(ap, fmt);
+ fprintf(stderr, "qemuimg: ");
+ vfprintf(stderr, fmt, ap);
+ fprintf(stderr, "\n");
+ exit(1);
+ va_end(ap);
+}
+
+static void format_print(void *opaque, const char *name)
+{
+ printf(" %s", name);
+}
+
+void help(void)
+{
+ printf("qemuimg version " QEMU_VERSION ", Copyright (c) 2004 Fabrice Bellard\n"
+ "usage: qemuimg command [command options]\n"
+ "QEMU disk image utility\n"
+ "\n"
+ "Command syntax:\n"
+ " create [-e] [-b base_image] [-f fmt] filename [size]\n"
+ " commit [-f fmt] filename\n"
+ " convert [-c] [-e] [-f fmt] filename [-O output_fmt] output_filename\n"
+ " info [-f fmt] filename\n"
+ "\n"
+ "Command parameters:\n"
+ " 'filename' is a disk image filename\n"
+ " 'base_image' is the read-only disk image which is used as base for a copy on\n"
+ " write image; the copy on write image only stores the modified data\n"
+ " 'fmt' is the disk image format. It is guessed automatically in most cases\n"
+ " 'size' is the disk image size in kilobytes. Optional suffixes 'M' (megabyte)\n"
+ " and 'G' (gigabyte) are supported\n"
+ " 'output_filename' is the destination disk image filename\n"
+ " 'output_fmt' is the destination format\n"
+ " '-c' indicates that target image must be compressed (qcow format only)\n"
+ " '-e' indicates that the target image must be encrypted (qcow format only)\n"
+ );
+ printf("\nSupported format:");
+ bdrv_iterate_format(format_print, NULL);
+ printf("\n");
+ exit(1);
+}
+
+
+#define NB_SUFFIXES 4
+
+static void get_human_readable_size(char *buf, int buf_size, int64_t size)
+{
+ char suffixes[NB_SUFFIXES] = "KMGT";
+ int64_t base;
+ int i;
+
+ if (size <= 999) {
+ snprintf(buf, buf_size, "%lld", size);
+ } else {
+ base = 1024;
+ for(i = 0; i < NB_SUFFIXES; i++) {
+ if (size < (10 * base)) {
+ snprintf(buf, buf_size, "%0.1f%c",
+ (double)size / base,
+ suffixes[i]);
+ break;
+ } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
+ snprintf(buf, buf_size, "%lld%c",
+ (size + (base >> 1)) / base,
+ suffixes[i]);
+ break;
+ }
+ base = base * 1024;
+ }
+ }
+}
+
+#if defined(WIN32)
+/* XXX: put correct support for win32 */
+static int read_password(char *buf, int buf_size)
+{
+ int c, i;
+ printf("Password: ");
+ fflush(stdout);
+ i = 0;
+ for(;;) {
+ c = getchar();
+ if (c == '\n')
+ break;
+ if (i < (buf_size - 1))
+ buf[i++] = c;
+ }
+ buf[i] = '\0';
+ return 0;
+}
+
+#else
+
+#include <termios.h>
+
+static struct termios oldtty;
+
+static void term_exit(void)
+{
+ tcsetattr (0, TCSANOW, &oldtty);
+}
+
+static void term_init(void)
+{
+ struct termios tty;
+
+ tcgetattr (0, &tty);
+ oldtty = tty;
+
+ tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP
+ |INLCR|IGNCR|ICRNL|IXON);
+ tty.c_oflag |= OPOST;
+ tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN);
+ tty.c_cflag &= ~(CSIZE|PARENB);
+ tty.c_cflag |= CS8;
+ tty.c_cc[VMIN] = 1;
+ tty.c_cc[VTIME] = 0;
+
+ tcsetattr (0, TCSANOW, &tty);
+
+ atexit(term_exit);
+}
+
+int read_password(char *buf, int buf_size)
+{
+ uint8_t ch;
+ int i, ret;
+
+ printf("password: ");
+ fflush(stdout);
+ term_init();
+ i = 0;
+ for(;;) {
+ ret = read(0, &ch, 1);
+ if (ret == -1) {
+ if (errno == EAGAIN || errno == EINTR) {
+ continue;
+ } else {
+ ret = -1;
+ break;
+ }
+ } else if (ret == 0) {
+ ret = -1;
+ break;
+ } else {
+ if (ch == '\r') {
+ ret = 0;
+ break;
+ }
+ if (i < (buf_size - 1))
+ buf[i++] = ch;
+ }
+ }
+ term_exit();
+ buf[i] = '\0';
+ printf("\n");
+ return ret;
+}
+#endif
+
+static int img_create(int argc, char **argv)
+{
+ int c, ret, encrypted;
+ const char *fmt = "raw";
+ const char *filename;
+ const char *base_filename = NULL;
+ int64_t size;
+ const char *p;
+ BlockDriver *drv;
+
+ encrypted = 0;
+ for(;;) {
+ c = getopt(argc, argv, "b:f:he");
+ if (c == -1)
+ break;
+ switch(c) {
+ case 'h':
+ help();
+ break;
+ case 'b':
+ base_filename = optarg;
+ break;
+ case 'f':
+ fmt = optarg;
+ break;
+ case 'e':
+ encrypted = 1;
+ break;
+ }
+ }
+ optind++;
+ if (optind >= argc)
+ help();
+ filename = argv[optind++];
+ size = 0;
+ if (!base_filename) {
+ if (optind >= argc)
+ help();
+ p = argv[optind];
+ size = strtoul(p, (char **)&p, 0);
+ if (*p == 'M') {
+ size *= 1024 * 1024;
+ } else if (*p == 'G') {
+ size *= 1024 * 1024 * 1024;
+ } else if (*p == 'k' || *p == 'K' || *p == '\0') {
+ size *= 1024;
+ } else {
+ help();
+ }
+ }
+ drv = bdrv_find_format(fmt);
+ if (!drv)
+ error("Unknown file format '%s'", fmt);
+ printf("Formating '%s', fmt=%s",
+ filename, fmt);
+ if (encrypted)
+ printf(", encrypted");
+ if (base_filename)
+ printf(", backing_file=%s\n",
+ base_filename);
+ else
+ printf(", size=%lld kB\n", size / 1024);
+ ret = bdrv_create(drv, filename, size / 512, base_filename, encrypted);
+ if (ret < 0) {
+ if (ret == -ENOTSUP) {
+ error("Formatting or formatting option not suppored for file format '%s'", fmt);
+ } else {
+ error("Error while formatting");
+ }
+ }
+ return 0;
+}
+
+static int img_commit(int argc, char **argv)
+{
+ int c, ret;
+ const char *filename, *fmt;
+ BlockDriver *drv;
+ BlockDriverState *bs;
+
+ fmt = NULL;
+ for(;;) {
+ c = getopt(argc, argv, "f:h");
+ if (c == -1)
+ break;
+ switch(c) {
+ case 'h':
+ help();
+ break;
+ case 'f':
+ fmt = optarg;
+ break;
+ }
+ }
+ optind++;
+ if (optind >= argc)
+ help();
+ filename = argv[optind++];
+
+ bs = bdrv_new("");
+ if (!bs)
+ error("Not enough memory");
+ if (fmt) {
+ drv = bdrv_find_format(fmt);
+ if (!drv)
+ error("Unknown file format '%s'", fmt);
+ } else {
+ drv = NULL;
+ }
+ if (bdrv_open2(bs, filename, 0, drv) < 0) {
+ error("Could not open '%s'", filename);
+ }
+ ret = bdrv_commit(bs);
+ switch(ret) {
+ case 0:
+ printf("Image committed.\n");
+ break;
+ case -ENOENT:
+ error("No disk inserted");
+ break;
+ case -EACCES:
+ error("Image is read-only");
+ break;
+ case -ENOTSUP:
+ error("Image is already committed");
+ break;
+ default:
+ error("Error while committing image");
+ break;
+ }
+
+ bdrv_delete(bs);
+ return 0;
+}
+
+static int is_not_zero(const uint8_t *sector, int len)
+{
+ int i;
+ len >>= 2;
+ for(i = 0;i < len; i++) {
+ if (((uint32_t *)sector)[i] != 0)
+ return 1;
+ }
+ return 0;
+}
+
+static int is_allocated_sectors(const uint8_t *buf, int n, int *pnum)
+{
+ int v, i;
+
+ if (n <= 0) {
+ *pnum = 0;
+ return 0;
+ }
+ v = is_not_zero(buf, 512);
+ for(i = 1; i < n; i++) {
+ buf += 512;
+ if (v != is_not_zero(buf, 512))
+ break;
+ }
+ *pnum = i;
+ return v;
+}
+
+static BlockDriverState *bdrv_new_open(const char *filename,
+ const char *fmt)
+{
+ BlockDriverState *bs;
+ BlockDriver *drv;
+ char password[256];
+
+ bs = bdrv_new("");
+ if (!bs)
+ error("Not enough memory");
+ if (fmt) {
+ drv = bdrv_find_format(fmt);
+ if (!drv)
+ error("Unknown file format '%s'", fmt);
+ } else {
+ drv = NULL;
+ }
+ if (bdrv_open2(bs, filename, 0, drv) < 0) {
+ error("Could not open '%s'", filename);
+ }
+ if (bdrv_is_encrypted(bs)) {
+ printf("Disk image '%s' is encrypted.\n", filename);
+ if (read_password(password, sizeof(password)) < 0)
+ error("No password given");
+ if (bdrv_set_key(bs, password) < 0)
+ error("invalid password");
+ }
+ return bs;
+}
+
+#define IO_BUF_SIZE 65536
+
+static int img_convert(int argc, char **argv)
+{
+ int c, ret, n, n1, compress, cluster_size, cluster_sectors, encrypt;
+ const char *filename, *fmt, *out_fmt, *out_filename;
+ BlockDriver *drv;
+ BlockDriverState *bs, *out_bs;
+ int64_t total_sectors, nb_sectors, sector_num;
+ uint8_t buf[IO_BUF_SIZE];
+ const uint8_t *buf1;
+
+ fmt = NULL;
+ out_fmt = "raw";
+ compress = 0;
+ encrypt = 0;
+ for(;;) {
+ c = getopt(argc, argv, "f:O:hce");
+ if (c == -1)
+ break;
+ switch(c) {
+ case 'h':
+ help();
+ break;
+ case 'f':
+ fmt = optarg;
+ break;
+ case 'O':
+ out_fmt = optarg;
+ break;
+ case 'c':
+ compress = 1;
+ break;
+ case 'e':
+ encrypt = 1;
+ break;
+ }
+ }
+ optind++;
+ if (optind >= argc)
+ help();
+ filename = argv[optind++];
+ if (optind >= argc)
+ help();
+ out_filename = argv[optind++];
+
+ bs = bdrv_new_open(filename, fmt);
+
+ drv = bdrv_find_format(out_fmt);
+ if (!drv)
+ error("Unknown file format '%s'", fmt);
+ if (compress && drv != &bdrv_qcow)
+ error("Compression not supported for this file format");
+ if (encrypt && drv != &bdrv_qcow)
+ error("Encryption not supported for this file format");
+ if (compress && encrypt)
+ error("Compression and encryption not supported at the same time");
+ bdrv_get_geometry(bs, &total_sectors);
+ ret = bdrv_create(drv, out_filename, total_sectors, NULL, encrypt);
+ if (ret < 0) {
+ if (ret == -ENOTSUP) {
+ error("Formatting not suppored for file format '%s'", fmt);
+ } else {
+ error("Error while formatting '%s'", out_filename);
+ }
+ }
+
+ out_bs = bdrv_new_open(out_filename, out_fmt);
+
+ if (compress) {
+ cluster_size = qcow_get_cluster_size(out_bs);
+ if (cluster_size <= 0 || cluster_size > IO_BUF_SIZE)
+ error("invalid cluster size");
+ cluster_sectors = cluster_size >> 9;
+ sector_num = 0;
+ for(;;) {
+ nb_sectors = total_sectors - sector_num;
+ if (nb_sectors <= 0)
+ break;
+ if (nb_sectors >= cluster_sectors)
+ n = cluster_sectors;
+ else
+ n = nb_sectors;
+ if (bdrv_read(bs, sector_num, buf, n) < 0)
+ error("error while reading");
+ if (n < cluster_sectors)
+ memset(buf + n * 512, 0, cluster_size - n * 512);
+ if (is_not_zero(buf, cluster_size)) {
+ if (qcow_compress_cluster(out_bs, sector_num, buf) != 0)
+ error("error while compressing sector %lld", sector_num);
+ }
+ sector_num += n;
+ }
+ } else {
+ sector_num = 0;
+ for(;;) {
+ nb_sectors = total_sectors - sector_num;
+ if (nb_sectors <= 0)
+ break;
+ if (nb_sectors >= (IO_BUF_SIZE / 512))
+ n = (IO_BUF_SIZE / 512);
+ else
+ n = nb_sectors;
+ if (bdrv_read(bs, sector_num, buf, n) < 0)
+ error("error while reading");
+ /* NOTE: at the same time we convert, we do not write zero
+ sectors to have a chance to compress the image. Ideally, we
+ should add a specific call to have the info to go faster */
+ buf1 = buf;
+ while (n > 0) {
+ if (is_allocated_sectors(buf1, n, &n1)) {
+ if (bdrv_write(out_bs, sector_num, buf1, n1) < 0)
+ error("error while writing");
+ }
+ sector_num += n1;
+ n -= n1;
+ buf1 += n1 * 512;
+ }
+ }
+ }
+ bdrv_delete(out_bs);
+ bdrv_delete(bs);
+ return 0;
+}
+
+static int img_info(int argc, char **argv)
+{
+ int c;
+ const char *filename, *fmt;
+ BlockDriver *drv;
+ BlockDriverState *bs;
+ char fmt_name[128], size_buf[128], dsize_buf[128];
+ int64_t total_sectors;
+ struct stat st;
+
+ fmt = NULL;
+ for(;;) {
+ c = getopt(argc, argv, "f:h");
+ if (c == -1)
+ break;
+ switch(c) {
+ case 'h':
+ help();
+ break;
+ case 'f':
+ fmt = optarg;
+ break;
+ }
+ }
+ optind++;
+ if (optind >= argc)
+ help();
+ filename = argv[optind++];
+
+ bs = bdrv_new("");
+ if (!bs)
+ error("Not enough memory");
+ if (fmt) {
+ drv = bdrv_find_format(fmt);
+ if (!drv)
+ error("Unknown file format '%s'", fmt);
+ } else {
+ drv = NULL;
+ }
+ if (bdrv_open2(bs, filename, 0, drv) < 0) {
+ error("Could not open '%s'", filename);
+ }
+ bdrv_get_format(bs, fmt_name, sizeof(fmt_name));
+ bdrv_get_geometry(bs, &total_sectors);
+ get_human_readable_size(size_buf, sizeof(size_buf), total_sectors * 512);
+ if (stat(filename, &st) < 0)
+ error("Could not stat '%s'", filename);
+ get_human_readable_size(dsize_buf, sizeof(dsize_buf),
+ (int64_t)st.st_blocks * 512);
+ printf("image: %s\n"
+ "file format: %s\n"
+ "virtual size: %s (%lld bytes)\n"
+ "disk size: %s\n",
+ filename, fmt_name, size_buf,
+ total_sectors * 512,
+ dsize_buf);
+ if (bdrv_is_encrypted(bs))
+ printf("encrypted: yes\n");
+ bdrv_delete(bs);
+ return 0;
+}
+
+int main(int argc, char **argv)
+{
+ const char *cmd;
+
+ bdrv_init();
+ if (argc < 2)
+ help();
+ cmd = argv[1];
+ if (!strcmp(cmd, "create")) {
+ img_create(argc, argv);
+ } else if (!strcmp(cmd, "commit")) {
+ img_commit(argc, argv);
+ } else if (!strcmp(cmd, "convert")) {
+ img_convert(argc, argv);
+ } else if (!strcmp(cmd, "info")) {
+ img_info(argc, argv);
+ } else {
+ help();
+ }
+ return 0;
+}
