[Libguestfs] [PATCH 1/3] NEW API: add a new api zero_fs

[Wanlong Gao]

Add the new api zero_fs to erase the filesystem signatures
on a device but now erase any data.

Signed-off-by: Wanlong Gao <gaowanlong at cn.fujitsu.com>
---
 daemon/zero.c                  |   17 +++++++++++++++++
 generator/generator_actions.ml |   14 ++++++++++++++
 src/MAX_PROC_NR                |    2 +-
 3 files changed, 32 insertions(+), 1 deletions(-)

diff --git a/daemon/zero.c b/daemon/zero.c
index 398f844..348869f 100644
--- a/daemon/zero.c
+++ b/daemon/zero.c
@@ -73,6 +73,23 @@ do_zero (const char *device)
 }
 
 int
+do_zero_fs (const char *device)
+{
+  int r;
+  char *err = NULL;
+
+  const char *wipefs[] = {"wipefs", "-a", device, NULL};
+  r = commandv (NULL, &err, wipefs);
+  if (r == -1) {
+    reply_with_error ("%s", err);
+    free (err);
+    return -1;
+  }
+  free (err);
+  return 0;
+}
+
+int
 do_zero_device (const char *device)
 {
   int64_t ssize = do_blockdev_getsize64 (device);
diff --git a/generator/generator_actions.ml b/generator/generator_actions.ml
index 3a7be79..d27ef43 100644
--- a/generator/generator_actions.ml
+++ b/generator/generator_actions.ml
@@ -6651,6 +6651,20 @@ This option may not be specified at the same time as the C<correct> option.
 
 =back");
 
+  ("zero_fs", (RErr, [Device "device"], []), 305, [Progress],
+   [InitBasicFSonLVM, Always, TestRun (
+      [["zero_fs"; "/dev/VG/LV"]])],
+   "wipe a filesystem signature from a device",
+   "\
+This command can  erase filesystem or raid signatures (magic strings) from
+the specified C<device> to make the filesystem invisible for libblkid.
+This does not erase the filesystem itself nor any other data from the C<device>.
+Compare with C<guestfs_zero> which just zeroes the first few blocks of a
+device, contained the partitions on the device, but this C<guestfs_zero_fs>
+can't erase the partitions of a device.
+
+=back");
+
 ]
 
 let all_functions = non_daemon_functions @ daemon_functions
diff --git a/src/MAX_PROC_NR b/src/MAX_PROC_NR
index 873b744..67d04b9 100644
--- a/src/MAX_PROC_NR
+++ b/src/MAX_PROC_NR
@@ -1 +1 @@
-304
+305
-- 
1.7.9