diff options
author | Ondrej Oprala | 2013-04-10 18:21:27 +0200 |
---|---|---|
committer | Karel Zak | 2013-04-26 12:27:37 +0200 |
commit | 7e658c15a2c1fc5092a790afbe7d9d395d04b098 (patch) | |
tree | 3b0bd40615c460fd413d912469972e4a0619305c /misc-utils | |
parent | tests: partx tests cleanup (diff) | |
download | kernel-qcow2-util-linux-7e658c15a2c1fc5092a790afbe7d9d395d04b098.tar.gz kernel-qcow2-util-linux-7e658c15a2c1fc5092a790afbe7d9d395d04b098.tar.xz kernel-qcow2-util-linux-7e658c15a2c1fc5092a790afbe7d9d395d04b098.zip |
wipefs: add --backup
[kzak@redhat.com: - don't wipe if failed to create a backup file
- use ts_scsi_debug_init in the regression tests]
Signed-off-by: Ondrej Oprala <ooprala@redhat.com>
Signed-off-by: Karel Zak <kzak@redhat.com>
Diffstat (limited to 'misc-utils')
-rw-r--r-- | misc-utils/wipefs.8 | 12 | ||||
-rw-r--r-- | misc-utils/wipefs.c | 47 |
2 files changed, 55 insertions, 4 deletions
diff --git a/misc-utils/wipefs.8 b/misc-utils/wipefs.8 index cdf449ec4..fee9aaf14 100644 --- a/misc-utils/wipefs.8 +++ b/misc-utils/wipefs.8 @@ -40,6 +40,10 @@ erased. Erase all available signatures. The set of erased signatures can be restricted with the \fB\-t\fP \fIlist\fP option. .TP +.BR \-b , " \-\-backup" +Create a signature backup to the file $HOME/wipefs-<devname>-<offset>.bak. +For more details see EXAMPLES section. +.TP .BR \-f , " \-\-force" Force erasure, even if the filesystem is mounted. This is required in order to erase the partition table on a block device. @@ -75,6 +79,14 @@ taken. For more details see mount(8). .TP .BR -V , " \-\-version" Output version information and exit. +.SH EXAMPLES +.TP +.BR "wipefs --all --backup /dev/sdb" +Erases all signatures from the device /dev/sdb and creates a signature backup +file ~/wipefs-sdb-<offset>.bak for each signature. +.TP +.BR "dd if=~/wipefs-sdb-0x00000438.bak of=/dev/sdb seek=$((0x00000438)) bs=1 conv=notrunc" +Restores ext2 signature from the backup file ~/wipefs-sdb-0x00000438.bak. .SH AUTHOR Karel Zak <kzak@redhat.com> .SH ENVIRONMENT diff --git a/misc-utils/wipefs.c b/misc-utils/wipefs.c index ce3d2b816..f10f498c7 100644 --- a/misc-utils/wipefs.c +++ b/misc-utils/wipefs.c @@ -309,13 +309,33 @@ static void do_wipe_real(blkid_probe pr, const char *devname, struct wipe_desc * putchar('\n'); } +static void do_backup(struct wipe_desc *wp, const char *base) +{ + char *fname = NULL; + int fd; + + xasprintf(&fname, "%s0x%08jx.bak", base, wp->offset); + + fd = open(fname, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR); + if (fd < 0) + goto err; + if (write_all(fd, wp->magic, wp->len) != 0) + goto err; + close(fd); + free(fname); + return; +err: + err(EXIT_FAILURE, _("%s: failed to create a signature backup"), fname); +} + static struct wipe_desc * -do_wipe(struct wipe_desc *wp, const char *devname, int noact, int all, int quiet, int force) +do_wipe(struct wipe_desc *wp, const char *devname, int noact, int all, int bkp, int quiet, int force) { int flags; blkid_probe pr; struct wipe_desc *w, *wp0; int zap = all ? 1 : wp->zap; + char *fn_base = NULL; flags = O_RDWR; if (!force) @@ -324,6 +344,13 @@ do_wipe(struct wipe_desc *wp, const char *devname, int noact, int all, int quiet if (!pr) return NULL; + if (zap && bkp) { + const char *home = getenv ("HOME"); + if (!home) + errx(EXIT_FAILURE, _("failed to create a signature backup, $HOME undefined")); + xasprintf (&fn_base, "%s/wipefs-%s-", home, basename(devname)); + } + wp0 = clone_offset(wp); while (blkid_do_probe(pr) == 0) { @@ -345,8 +372,11 @@ do_wipe(struct wipe_desc *wp, const char *devname, int noact, int all, int quiet if (!wp->on_disk) continue; - if (zap) + if (zap) { + if (bkp) + do_backup(wp, fn_base); do_wipe_real(pr, devname, wp, noact, quiet); + } } for (w = wp0; w != NULL; w = w->next) { @@ -358,6 +388,7 @@ do_wipe(struct wipe_desc *wp, const char *devname, int noact, int all, int quiet close(blkid_probe_get_fd(pr)); blkid_free_probe(pr); free_wipe(wp0); + free(fn_base); return wp; } @@ -372,6 +403,7 @@ usage(FILE *out) fputs(_("\nOptions:\n"), out); fputs(_(" -a, --all wipe all magic strings (BE CAREFUL!)\n" + " -b, --backup create a signature backup in $HOME\n" " -f, --force force erasure\n" " -h, --help show this help text\n" " -n, --no-act do everything except the actual write() call\n" @@ -391,11 +423,12 @@ int main(int argc, char **argv) { struct wipe_desc *wp0 = NULL, *wp; - int c, all = 0, force = 0, has_offset = 0, noact = 0, quiet = 0; + int c, all = 0, bkp = 0, force = 0, has_offset = 0, noact = 0, quiet = 0; int mode = WP_MODE_PRETTY; static const struct option longopts[] = { { "all", 0, 0, 'a' }, + { "backup", 0, 0, 'b' }, { "force", 0, 0, 'f' }, { "help", 0, 0, 'h' }, { "no-act", 0, 0, 'n' }, @@ -426,6 +459,9 @@ main(int argc, char **argv) case 'a': all++; break; + case 'b': + bkp++; + break; case 'f': force++; break; @@ -461,6 +497,9 @@ main(int argc, char **argv) if (optind == argc) usage(stderr); + if (bkp && !(all || has_offset)) + warnx(_("The --backup option is meaningless in this context")); + if (!all && !has_offset) { /* * Print only @@ -477,7 +516,7 @@ main(int argc, char **argv) */ while (optind < argc) { wp = clone_offset(wp0); - wp = do_wipe(wp, argv[optind++], noact, all, quiet, + wp = do_wipe(wp, argv[optind++], noact, all, bkp, quiet, force); free_wipe(wp); } |