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author | Karel Zak | 2017-02-14 13:07:54 +0100 |
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committer | Karel Zak | 2017-02-14 13:07:54 +0100 |
commit | 37204dc60c048be91794e349fc41217aea7363b7 (patch) | |
tree | ed290a88c6876a99cd3149d39781922e1ab99b3b /libfdisk/src/wipe.c | |
parent | lib/randutils: glibc 2.25 has getrandom(2) declaration (diff) | |
download | kernel-qcow2-util-linux-37204dc60c048be91794e349fc41217aea7363b7.tar.gz kernel-qcow2-util-linux-37204dc60c048be91794e349fc41217aea7363b7.tar.xz kernel-qcow2-util-linux-37204dc60c048be91794e349fc41217aea7363b7.zip |
libfdisk: check for collisions when create new label
We need to be sure that when create a new disklabel than the old label
will be removed.
Addresses: https://github.com/karelzak/util-linux/issues/410
Signed-off-by: Karel Zak <kzak@redhat.com>
Diffstat (limited to 'libfdisk/src/wipe.c')
-rw-r--r-- | libfdisk/src/wipe.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/libfdisk/src/wipe.c b/libfdisk/src/wipe.c index e773f756d..c58015d0e 100644 --- a/libfdisk/src/wipe.c +++ b/libfdisk/src/wipe.c @@ -143,3 +143,53 @@ int fdisk_do_wipe(struct fdisk_context *cxt) #endif return 0; } + + +/* + * Please don't call this function if there is already a PT. + * + * Returns: 0 if nothing found, < 0 on error, 1 if found a signature + */ +int fdisk_check_collisions(struct fdisk_context *cxt) +{ +#ifdef HAVE_LIBBLKID + int rc = 0; + blkid_probe pr; + + assert(cxt); + assert(cxt->dev_fd >= 0); + + DBG(CXT, ul_debugobj(cxt, "wipe check: initialize libblkid prober")); + + pr = blkid_new_probe(); + if (!pr) + return -ENOMEM; + rc = blkid_probe_set_device(pr, cxt->dev_fd, 0, 0); + if (rc) + return rc; + + blkid_probe_enable_superblocks(pr, 1); + blkid_probe_set_superblocks_flags(pr, BLKID_SUBLKS_TYPE); + blkid_probe_enable_partitions(pr, 1); + + /* we care about the first found FS/raid, so don't call blkid_do_probe() + * in loop or don't use blkid_do_fullprobe() ... */ + rc = blkid_do_probe(pr); + if (rc == 0) { + const char *name = NULL; + + if (blkid_probe_lookup_value(pr, "TYPE", &name, 0) == 0 || + blkid_probe_lookup_value(pr, "PTTYPE", &name, 0) == 0) { + cxt->collision = strdup(name); + if (!cxt->collision) + rc = -ENOMEM; + } + } + + blkid_free_probe(pr); + return rc; +#else + return 0; +#endif +} + |