Archipelago » qemu

/*

 * 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, "qemu-img: ");

    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("qemu-img version " QEMU_VERSION ", Copyright (c) 2004 Fabrice Bellard\n"

           "usage: qemu-img 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 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;

}

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;

        }

    }

    if (optind >= argc) 

        help();

    filename = argv[optind++];

    size = 0;

    if (base_filename) {

        BlockDriverState *bs;

        bs = bdrv_new_open(base_filename, NULL);

        bdrv_get_geometry(bs, &size);

        size *= 512;

        bdrv_delete(bs);

    } else {

        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",

               base_filename);

    }

    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 supported 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;

        }

    }

    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;

}

#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;

        }

    }

    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 supported 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;

}

#ifdef _WIN32

static int64_t get_allocated_file_size(const char *filename)

{

    struct _stati64 st;

    if (_stati64(filename, &st) < 0) 

        return -1;

    return st.st_size;

}

#else

static int64_t get_allocated_file_size(const char *filename)

{

    struct stat st;

    if (stat(filename, &st) < 0) 

        return -1;

    return (int64_t)st.st_blocks * 512;

}

#endif

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, allocated_size;

    fmt = NULL;

    for(;;) {

        c = getopt(argc, argv, "f:h");

        if (c == -1)

            break;

        switch(c) {

        case 'h':

            help();

            break;

        case 'f':

            fmt = optarg;

            break;

        }

    }

    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);

    allocated_size = get_allocated_file_size(filename);

    if (allocated_size < 0)

        error("Could not get file size '%s'", filename);

    get_human_readable_size(dsize_buf, sizeof(dsize_buf), 

                            allocated_size);

    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];

    optind++;

    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;

}