diff options
| -rw-r--r-- | disk-utils/sfdisk.c | 126 |
1 files changed, 113 insertions, 13 deletions
diff --git a/disk-utils/sfdisk.c b/disk-utils/sfdisk.c index 45121f5e6..1a6db9877 100644 --- a/disk-utils/sfdisk.c +++ b/disk-utils/sfdisk.c @@ -39,6 +39,7 @@ #include "closestream.h" #include "colors.h" #include "blkdev.h" +#include "all-io.h" #include "libfdisk.h" #include "fdisk-list.h" @@ -75,6 +76,7 @@ struct sfdisk { int act; /* action */ int partno; /* -N <partno>, default -1 */ const char *label; /* --label <label> */ + const char *backup_file; /* -O <path> */ struct fdisk_context *cxt; /* libfdisk context */ @@ -82,6 +84,7 @@ struct sfdisk { quiet : 1, /* suppres extra messages */ noreread : 1, /* don't check device is in use */ force : 1, /* do also stupid things */ + backup : 1, /* backup sectors before write PT */ noact : 1; /* do not write to device */ }; @@ -196,6 +199,85 @@ static int sfdisk_deinit(struct sfdisk *sf) return rc; } +static void backup_sectors(struct sfdisk *sf, + const char *tpl, + const char *name, + const char *devname, + off_t offset, size_t size) +{ + char *fname; + int fd, devfd; + + devfd = fdisk_get_devfd(sf->cxt); + assert(devfd >= 0); + + xasprintf(&fname, "%s0x%08jx.bak", tpl, offset); + + fd = open(fname, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR); + if (fd < 0) + goto fail; + + if (lseek(devfd, offset, SEEK_SET) == (off_t) -1) { + fdisk_warn(sf->cxt, _("cannot seek %s"), devname); + goto fail; + } else { + unsigned char *buf = xmalloc(size); + + if (read_all(devfd, (char *) buf, size) != (ssize_t) size) { + fdisk_warn(sf->cxt, _("cannot read %s"), devname); + goto fail; + } + if (write_all(fd, buf, size) != 0) { + fdisk_warn(sf->cxt, _("cannot write %s"), fname); + goto fail; + } + free(buf); + } + + fdisk_info(sf->cxt, _("%12s (offset %5ju, size %5ju): %s"), + name, (uintmax_t) offset, (uintmax_t) size, fname); + close(fd); + free(fname); + return; +fail: + errx(EXIT_FAILURE, _("%s: failed to create a backup"), devname); +} + +static void backup_partition_table(struct sfdisk *sf, const char *devname) +{ + const char *name; + char *tpl; + off_t offset = 0; + size_t size = 0; + int i = 0; + + assert(sf); + + if (!fdisk_has_label(sf->cxt)) + return; + + if (!sf->backup_file) { + /* initialize default backup filename */ + const char *home = getenv ("HOME"); + if (!home) + errx(EXIT_FAILURE, _("failed to create a signature backup, $HOME undefined")); + xasprintf(&tpl, "%s/sfdisk-%s-", home, basename(devname)); + } else + xasprintf(&tpl, "%s-%s-", sf->backup_file, basename(devname)); + + color_scheme_enable("header", UL_COLOR_BOLD); + fdisk_info(sf->cxt, _("Backup files:")); + color_disable(); + + while (fdisk_locate_disklabel(sf->cxt, i++, &name, &offset, &size) == 0 && size) + backup_sectors(sf, tpl, name, devname, offset, size); + + if (!sf->quiet) + fputc('\n', stdout); + free(tpl); +} + + /* * sfdisk --list [<device ..] */ @@ -433,6 +515,8 @@ static int command_activate(struct sfdisk *sf, int argc, char **argv) if (!fdisk_is_label(sf->cxt, DOS)) errx(EXIT_FAILURE, _("toggle boot flags is supported for MBR only")); + if (!listonly && sf->backup) + backup_partition_table(sf, devname); nparts = fdisk_get_npartitions(sf->cxt); for (i = 0; i < nparts; i++) { @@ -573,6 +657,9 @@ static int command_parttype(struct sfdisk *sf, int argc, char **argv) return 0; } + if (sf->backup) + backup_partition_table(sf, devname); + /* parse <type> and apply yo PT */ type = fdisk_label_parse_parttype(lb, typestr); if (!type || fdisk_parttype_is_unknown(type)) @@ -800,6 +887,9 @@ static int command_fdisk(struct sfdisk *sf, int argc, char **argv) fputs(_(" OK\n\n"), stdout); } + if (sf->backup) + backup_partition_table(sf, devname); + if (!sf->quiet) { list_disk_geometry(sf->cxt); if (fdisk_has_label(sf->cxt)) { @@ -953,20 +1043,22 @@ static void __attribute__ ((__noreturn__)) usage(FILE *out) fputs(USAGE_SEPARATOR, out); - fputs(_(" <dev> device (usually disk) path\n"), out); - fputs(_(" <part> partition number\n"), out); - fputs(_(" <type> partition type, GUID for GPT, hex for MBR\n"), out); + fputs(_(" <dev> device (usually disk) path\n"), out); + fputs(_(" <part> partition number\n"), out); + fputs(_(" <type> partition type, GUID for GPT, hex for MBR\n"), out); fputs(USAGE_OPTIONS, out); - fputs(_(" -f, --force disable all consistency checking\n"), out); - fputs(_(" -N, --partno <num> specify partition number\n"), out); - fputs(_(" -X, --label <name> specify label type (dos, gpt, ...)\n"), out); - fputs(_(" -q, --quiet suppress extra info messages\n"), out); - fputs(_(" -n, --no-act do everything except write to device\n"), out); - fputs(_(" --no-reread do not check whether the device is in use\n"), out); + fputs(_(" -b, --backup backup partition table sectors (see -O)\n"), out); + fputs(_(" -f, --force disable all consistency checking\n"), out); + fputs(_(" -O, --backup-file <path> override default backout file name\n"), out); + fputs(_(" -N, --partno <num> specify partition number\n"), out); + fputs(_(" -X, --label <name> specify label type (dos, gpt, ...)\n"), out); + fputs(_(" -q, --quiet suppress extra info messages\n"), out); + fputs(_(" -n, --no-act do everything except write to device\n"), out); + fputs(_(" --no-reread do not check whether the device is in use\n"), out); fputs(USAGE_SEPARATOR, out); - fputs(_(" -u, --unit S deprecated, only sector unit is supported\n"), out); - fputs(_(" -L, --Linux deprecated and ignored, only for backward copatibility\n"), out); + fputs(_(" -u, --unit S deprecated, only sector unit is supported\n"), out); + fputs(_(" -L, --Linux deprecated, only for backward copatibility\n"), out); fputs(USAGE_SEPARATOR, out); fputs(USAGE_HELP, out); @@ -977,7 +1069,6 @@ static void __attribute__ ((__noreturn__)) usage(FILE *out) } - int main(int argc, char *argv[]) { int rc = -EINVAL, c, longidx = -1; @@ -994,6 +1085,8 @@ int main(int argc, char *argv[]) static const struct option longopts[] = { { "activate",no_argument, NULL, 'a' }, + { "backup", no_argument, NULL, 'b' }, + { "backup-file", required_argument, NULL, 'O' }, { "dump", no_argument, NULL, 'd' }, { "help", no_argument, NULL, 'h' }, { "force", no_argument, NULL, 'f' }, @@ -1025,12 +1118,15 @@ int main(int argc, char *argv[]) textdomain(PACKAGE); atexit(close_stdout); - while ((c = getopt_long(argc, argv, "adfhglLnN:qsTu:vVX:", + while ((c = getopt_long(argc, argv, "adfhglLO:nN:qsTu:vVX:", longopts, &longidx)) != -1) { switch(c) { case 'a': sf->act = ACT_ACTIVATE; break; + case 'b': + sf->backup = 1; + break; case OPT_CHANGE_ID: case OPT_PRINT_ID: case OPT_ID: @@ -1052,6 +1148,10 @@ int main(int argc, char *argv[]) case 'L': warnx(_("--Linux option is deprecated and unnecessary")); break; + case 'O': + sf->backup = 1; + sf->backup_file = optarg; + break; case 'd': sf->act = ACT_DUMP; break; |