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Chen Hanxiao

2015-Jun-30 11:23 UTC

[Libguestfs] [PATCH v4 0/7] uuid: add btrfs uuid change support and set_uuid_random

- Btrfs-progs v4.1 introduced new feature of changing
  uuid of btrfs partition.
  This patch add support of this.

- Introduce set_uuid_random

- uuids.c did a lot of deplicated work for changing uuid
  of fs. Use existing functions.

v4: introduce get_random_uuid
    improve testcases
    squash internal API patches
v3.1: fix typos
v3: set errno if feature is not available.

Chen Hanxiao (7):
  uuid: add support to change uuid of btrfs partition
  uuid: use existing function of ext2
  uuid: use newly introduced xfs_set_uuid of xfs
  uuid: use newly introduced swap_set_uuid
  daemon: add get_random_uuid
  daemon: add functions for setting random uuid of fs
  New API: set_uuid_random

 appliance/packagelist.in       |  1 +
 daemon/btrfs.c                 | 81 ++++++++++++++++++++++++++++++++++++++++++
 daemon/daemon.h                | 11 ++++++
 daemon/ext2.c                  | 15 ++++++++
 daemon/guestfsd.c              | 19 ++++++++++
 daemon/swap.c                  | 29 +++++++++++++++
 daemon/uuids.c                 | 71 +++++++++++++++++-------------------
 daemon/xfs.c                   | 14 ++++++++
 generator/actions.ml           | 16 +++++++++
 src/MAX_PROC_NR                |  2 +-
 tests/btrfs/test-btrfs-misc.pl | 36 +++++++++++++++++++
 11 files changed, 255 insertions(+), 40 deletions(-)

-- 
2.1.0

Chen Hanxiao

2015-Jun-30 11:23 UTC

head link

[Libguestfs] [PATCH v4 1/7] uuid: add support to change uuid of btrfs partition

btrfs-progs v4.1 add support to change uuid of btrfs fs.

Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com>
---
v4: although btrfstune did not had '--help', pass it anyway
    improve testcases
v3: set errno as ENOTSUP when btrfstune -u is not available
v2: put btrfs operation back to daemon/btrfs.c
    move tests to tests/btrfs

 daemon/btrfs.c                 | 60 ++++++++++++++++++++++++++++++++++++++++++
 daemon/daemon.h                |  1 +
 daemon/uuids.c                 |  6 ++---
 tests/btrfs/test-btrfs-misc.pl | 21 +++++++++++++++
 4 files changed, 84 insertions(+), 4 deletions(-)

diff --git a/daemon/btrfs.c b/daemon/btrfs.c
index cedea31..4cdc6a7 100644
--- a/daemon/btrfs.c
+++ b/daemon/btrfs.c
@@ -797,6 +797,44 @@ do_btrfs_device_delete (char *const *devices, const char
*fs)
   return 0;
 }
 
+
+/* btrfstune command add two new options
+ * -U UUID      change fsid to UUID
+ * -u           change fsid, use a random one
+ * since v4.1
+ * We could check wheter 'btrfstune' support
+ * '-u' and '-U UUID' option by checking the output of
+ * 'btrfstune' command.
+ */
+static int
+test_btrfstune_uuid_opt (void)
+{
+  static int result = -1;
+  if (result != -1)
+    return result;
+
+  CLEANUP_FREE char *err = NULL;
+
+  int r = commandr (NULL, &err, str_btrfstune, "--help", NULL);
+
+  if (r == -1) {
+    reply_with_error ("btrfstune: %s", err);
+    return -1;
+  }
+
+  /* FIXME currently btrfstune do not support '--help'.
+   * If got an invalid options, it will print its usage
+   * in stderr.
+   * We had to check it there.
+   */
+  if (strstr (err, "-U") == NULL || strstr (err, "-u") ==
NULL)
+    result = 0;
+  else
+    result = 1;
+
+  return result;
+}
+
 int
 do_btrfs_set_seeding (const char *device, int svalue)
 {
@@ -814,6 +852,28 @@ do_btrfs_set_seeding (const char *device, int svalue)
   return 0;
 }
 
+int
+btrfs_set_uuid (const char *device, const char *uuid)
+{
+  CLEANUP_FREE char *err = NULL;
+  int r;
+  int has_uuid_opts = test_btrfstune_uuid_opt ();
+
+  if (has_uuid_opts <= 0) {
+    reply_with_error_errno (ENOTSUP, "btrfs filesystems' UUID cannot
be changed");
+    return -1;
+  }
+
+  r = commandr (NULL, &err, str_btrfstune, "-f", "-U",
uuid, device, NULL);
+
+  if (r == -1) {
+    reply_with_error ("%s: %s", device, err);
+    return -1;
+  }
+
+  return 0;
+}
+
 /* Takes optional arguments, consult optargs_bitmask. */
 int
 do_btrfs_fsck (const char *device, int64_t superblock, int repair)
diff --git a/daemon/daemon.h b/daemon/daemon.h
index e977095..dd7798c 100644
--- a/daemon/daemon.h
+++ b/daemon/daemon.h
@@ -270,6 +270,7 @@ extern char *debug_bmap_device (const char *subcmd, size_t
argc, char *const *co
 
 /*-- in btrfs.c --*/
 extern char *btrfs_get_label (const char *device);
+extern int btrfs_set_uuid (const char *device, const char *uuid);
 
 /*-- in ntfs.c --*/
 extern char *ntfs_get_label (const char *device);
diff --git a/daemon/uuids.c b/daemon/uuids.c
index 06b33e9..f98d8e5 100644
--- a/daemon/uuids.c
+++ b/daemon/uuids.c
@@ -110,10 +110,8 @@ do_set_uuid (const char *device, const char *uuid)
   else if (STREQ (vfs_type, "swap"))
     r = swapuuid (device, uuid);
 
-  else if (STREQ (vfs_type, "btrfs")) {
-    reply_with_error ("btrfs filesystems' UUID cannot be
changed");
-    r = -1;
-  }
+  else if (STREQ (vfs_type, "btrfs"))
+    r = btrfs_set_uuid (device, uuid);
 
   else {
     reply_with_error ("don't know how to set the UUID for '%s'
filesystems",
diff --git a/tests/btrfs/test-btrfs-misc.pl b/tests/btrfs/test-btrfs-misc.pl
index 2fe7c59..0643eeb 100755
--- a/tests/btrfs/test-btrfs-misc.pl
+++ b/tests/btrfs/test-btrfs-misc.pl
@@ -20,6 +20,7 @@
 
 use strict;
 use warnings;
+use Errno;
 
 use Sys::Guestfs;
 
@@ -47,5 +48,25 @@ my $label = $g->vfs_label ("/dev/sda1");
 die "unexpected label: expecting 'newlabel' but got
'$label'"
     unless $label eq "newlabel";
 
+# Setting btrfs UUID
+eval {
+    $g->set_uuid ("/dev/sda1",
"12345678-1234-1234-1234-123456789012");
+};
+
+my $err = $g->last_errno ();
+
+if ($@) {
+    if ($err == Errno::ENOTSUP()) {
+        warn "$0: skipping test for btrfs UUID change feature is not
available";
+    } elsif ($err) {
+        die $@;
+    }
+} else {
+    my $uuid = $g->vfs_uuid ("/dev/sda1");
+    die "unexpected uuid expecting
+     '12345678-1234-1234-1234-123456789012' but got
'$uuid'"
+    unless $uuid eq "12345678-1234-1234-1234-123456789012";
+}
+
 $g->shutdown ();
 $g->close ();
-- 
2.1.0

Chen Hanxiao

2015-Jun-30 11:23 UTC

head link

[Libguestfs] [PATCH v4 2/7] uuid: use existing function of ext2

Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com>
---
v3: improve commit log

 daemon/uuids.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/daemon/uuids.c b/daemon/uuids.c
index f98d8e5..b8b820a 100644
--- a/daemon/uuids.c
+++ b/daemon/uuids.c
@@ -27,16 +27,12 @@
 #include "actions.h"
 #include "optgroups.h"
 
-GUESTFSD_EXT_CMD(str_tune2fs, tune2fs);
 GUESTFSD_EXT_CMD(str_xfs_admin, xfs_admin);
 GUESTFSD_EXT_CMD(str_swaplabel, swaplabel);
 
 static int
 e2uuid (const char *device, const char *uuid)
 {
-  int r;
-  CLEANUP_FREE char *err = NULL;
-
   /* Don't allow the magic values here.  If callers want to do this
    * we'll add alternate set_uuid_* calls.
    */
@@ -46,13 +42,7 @@ e2uuid (const char *device, const char *uuid)
     return -1;
   }
 
-  r = command (NULL, &err, str_tune2fs, "-U", uuid, device,
NULL);
-  if (r == -1) {
-    reply_with_error ("%s", err);
-    return -1;
-  }
-
-  return 0;
+  return do_set_e2uuid (device, uuid);
 }
 
 static int
-- 
2.1.0

Chen Hanxiao

2015-Jun-30 11:23 UTC

head link

[Libguestfs] [PATCH v4 3/7] uuid: use newly introduced xfs_set_uuid of xfs

Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com>
---
v3: rename do_xfs_admin_uuid to xfs_set_uuid

 daemon/daemon.h |  1 +
 daemon/uuids.c  | 12 +-----------
 daemon/xfs.c    |  7 +++++++
 3 files changed, 9 insertions(+), 11 deletions(-)

diff --git a/daemon/daemon.h b/daemon/daemon.h
index dd7798c..cbe8ada 100644
--- a/daemon/daemon.h
+++ b/daemon/daemon.h
@@ -262,6 +262,7 @@ extern int copy_xattrs (const char *src, const char *dest);
 /*-- in xfs.c --*/
 /* Documented in xfs_admin(8). */
 #define XFS_LABEL_MAX 12
+extern int xfs_set_uuid (const char *device, const char *uuid);
 
 /*-- debug-bmap.c --*/
 extern char *debug_bmap (const char *subcmd, size_t argc, char *const *const
argv);
diff --git a/daemon/uuids.c b/daemon/uuids.c
index b8b820a..dce0d60 100644
--- a/daemon/uuids.c
+++ b/daemon/uuids.c
@@ -27,7 +27,6 @@
 #include "actions.h"
 #include "optgroups.h"
 
-GUESTFSD_EXT_CMD(str_xfs_admin, xfs_admin);
 GUESTFSD_EXT_CMD(str_swaplabel, swaplabel);
 
 static int
@@ -48,22 +47,13 @@ e2uuid (const char *device, const char *uuid)
 static int
 xfsuuid (const char *device, const char *uuid)
 {
-  int r;
-  CLEANUP_FREE char *err = NULL;
-
   /* Don't allow special values. */
   if (STREQ (uuid, "nil") || STREQ (uuid, "generate")) {
     reply_with_error ("xfs: invalid new UUID");
     return -1;
   }
 
-  r = command (NULL, &err, str_xfs_admin, "-U", uuid, device,
NULL);
-  if (r == -1) {
-    reply_with_error ("%s", err);
-    return -1;
-  }
-
-  return 0;
+  return xfs_set_uuid (device, uuid);
 }
 
 static int
diff --git a/daemon/xfs.c b/daemon/xfs.c
index 687013b..fb7acb4 100644
--- a/daemon/xfs.c
+++ b/daemon/xfs.c
@@ -456,6 +456,13 @@ do_xfs_growfs (const char *path,
 }
 
 int
+xfs_set_uuid (const char *device, const char *uuid)
+{
+  optargs_bitmask = GUESTFS_XFS_ADMIN_UUID_BITMASK;
+  return do_xfs_admin (device, 0, 0, 0, 0, 0, NULL, uuid);
+}
+
+int
 do_xfs_admin (const char *device,
               int extunwritten, int imgfile, int v2log,
               int projid32bit,
-- 
2.1.0

Chen Hanxiao

2015-Jun-30 11:23 UTC

head link

[Libguestfs] [PATCH v4 4/7] uuid: use newly introduced swap_set_uuid

Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com>
---
v3: move swapuuid to swap.c
    rename it as swap_set_uuid

 daemon/daemon.h |  3 +++
 daemon/swap.c   | 16 ++++++++++++++++
 daemon/uuids.c  | 18 +-----------------
 3 files changed, 20 insertions(+), 17 deletions(-)

diff --git a/daemon/daemon.h b/daemon/daemon.h
index cbe8ada..d8a5e0b 100644
--- a/daemon/daemon.h
+++ b/daemon/daemon.h
@@ -276,6 +276,9 @@ extern int btrfs_set_uuid (const char *device, const char
*uuid);
 /*-- in ntfs.c --*/
 extern char *ntfs_get_label (const char *device);
 
+/*-- in swap.c --*/
+extern int swap_set_uuid (const char *device, const char *uuid);
+
 /* ordinary daemon functions use these to indicate errors
  * NB: you don't need to prefix the string with the current command,
  * it is added automatically by the client-side RPC stubs.
diff --git a/daemon/swap.c b/daemon/swap.c
index 83f4d7c..26fe30d 100644
--- a/daemon/swap.c
+++ b/daemon/swap.c
@@ -33,6 +33,7 @@
 GUESTFSD_EXT_CMD(str_mkswap, mkswap);
 GUESTFSD_EXT_CMD(str_swapon, swapon);
 GUESTFSD_EXT_CMD(str_swapoff, swapoff);
+GUESTFSD_EXT_CMD(str_swaplabel, swaplabel);
 
 /* Confirmed this is true for Linux swap partitions from the Linux sources. */
 #define SWAP_LABEL_MAX 16
@@ -239,3 +240,18 @@ do_swapoff_uuid (const char *uuid)
 {
   return swaponoff (str_swapoff, "-U", uuid);
 }
+
+int
+swap_set_uuid (const char *device, const char *uuid)
+{
+  int r;
+  CLEANUP_FREE char *err = NULL;
+
+  r = command (NULL, &err, str_swaplabel, "-U", uuid, device,
NULL);
+  if (r == -1) {
+    reply_with_error ("%s", err);
+    return -1;
+  }
+
+  return 0;
+}
diff --git a/daemon/uuids.c b/daemon/uuids.c
index dce0d60..5238f3e 100644
--- a/daemon/uuids.c
+++ b/daemon/uuids.c
@@ -27,7 +27,6 @@
 #include "actions.h"
 #include "optgroups.h"
 
-GUESTFSD_EXT_CMD(str_swaplabel, swaplabel);
 
 static int
 e2uuid (const char *device, const char *uuid)
@@ -56,21 +55,6 @@ xfsuuid (const char *device, const char *uuid)
   return xfs_set_uuid (device, uuid);
 }
 
-static int
-swapuuid (const char *device, const char *uuid)
-{
-  int r;
-  CLEANUP_FREE char *err = NULL;
-
-  r = command (NULL, &err, str_swaplabel, "-U", uuid, device,
NULL);
-  if (r == -1) {
-    reply_with_error ("%s", err);
-    return -1;
-  }
-
-  return 0;
-}
-
 int
 do_set_uuid (const char *device, const char *uuid)
 {
@@ -88,7 +72,7 @@ do_set_uuid (const char *device, const char *uuid)
     r = xfsuuid (device, uuid);
 
   else if (STREQ (vfs_type, "swap"))
-    r = swapuuid (device, uuid);
+    r = swap_set_uuid (device, uuid);
 
   else if (STREQ (vfs_type, "btrfs"))
     r = btrfs_set_uuid (device, uuid);
-- 
2.1.0

Chen Hanxiao

2015-Jun-30 11:23 UTC

head link

[Libguestfs] [PATCH v4 5/7] daemon: add get_random_uuid

Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com>
---
 appliance/packagelist.in |  1 +
 daemon/daemon.h          |  2 ++
 daemon/guestfsd.c        | 19 +++++++++++++++++++
 3 files changed, 22 insertions(+)

diff --git a/appliance/packagelist.in b/appliance/packagelist.in
index 76c7293..d218a37 100644
--- a/appliance/packagelist.in
+++ b/appliance/packagelist.in
@@ -97,6 +97,7 @@ dnl iproute has been renamed to iproute2
   vim-tiny
   xz-utils
   zfs-fuse
+  uuid-runtime
 )
 
 ifelse(ARCHLINUX,1,
diff --git a/daemon/daemon.h b/daemon/daemon.h
index d8a5e0b..f8441d1 100644
--- a/daemon/daemon.h
+++ b/daemon/daemon.h
@@ -152,6 +152,8 @@ extern void udev_settle (void);
 
 extern int random_name (char *template);
 
+extern char *get_random_uuid (void);
+
 /* This just stops gcc from giving a warning about our custom printf
  * formatters %Q and %R.  See guestfs(3)/EXTENDING LIBGUESTFS for more
  * info about these.  In GCC 4.8.0 the warning is even harder to
diff --git a/daemon/guestfsd.c b/daemon/guestfsd.c
index 584c685..7f4b2f2 100644
--- a/daemon/guestfsd.c
+++ b/daemon/guestfsd.c
@@ -57,6 +57,7 @@
 #include "daemon.h"
 
 GUESTFSD_EXT_CMD(str_udevadm, udevadm);
+GUESTFSD_EXT_CMD(str_uuidgen, uuidgen);
 
 #ifndef MAX
 # define MAX(a,b) ((a)>(b)?(a):(b))
@@ -1509,6 +1510,24 @@ udev_settle (void)
     fprintf (stderr, "warning: udevadm command failed\n");
 }
 
+char *
+get_random_uuid (void)
+{
+  int r;
+  char *out;
+  CLEANUP_FREE char *err = NULL;
+
+  r = command (&out, &err, str_uuidgen, NULL);
+  if (r == -1) {
+    reply_with_error ("%s", err);
+    return NULL;
+  }
+
+  /* caller free */
+  return out;
+
+}
+
 /* Use by the CLEANUP_* macros.  Do not call these directly. */
 void
 cleanup_free (void *ptr)
-- 
2.1.0

Chen Hanxiao

2015-Jun-30 11:23 UTC

head link

[Libguestfs] [PATCH v4 6/7] daemon: add functions for setting random uuid of fs

Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com>
---
 daemon/btrfs.c  | 21 +++++++++++++++++++++
 daemon/daemon.h |  4 ++++
 daemon/ext2.c   | 15 +++++++++++++++
 daemon/swap.c   | 13 +++++++++++++
 daemon/xfs.c    |  7 +++++++
 5 files changed, 60 insertions(+)

diff --git a/daemon/btrfs.c b/daemon/btrfs.c
index 4cdc6a7..2b0cae9 100644
--- a/daemon/btrfs.c
+++ b/daemon/btrfs.c
@@ -874,6 +874,27 @@ btrfs_set_uuid (const char *device, const char *uuid)
   return 0;
 }
 
+int
+btrfs_set_uuid_random (const char *device)
+{
+  CLEANUP_FREE char *err = NULL;
+  int r;
+  int has_uuid_opts = test_btrfstune_uuid_opt();
+
+  if (has_uuid_opts <= 0) {
+    reply_with_error_errno (ENOTSUP, "btrfs filesystems' UUID cannot
be changed");
+    return -1;
+  }
+
+  r = commandr (NULL, &err, str_btrfstune, "-f", "-u",
device, NULL);
+  if (r == -1) {
+    reply_with_error ("%s: %s", device, err);
+    return -1;
+  }
+
+  return 0;
+}
+
 /* Takes optional arguments, consult optargs_bitmask. */
 int
 do_btrfs_fsck (const char *device, int64_t superblock, int repair)
diff --git a/daemon/daemon.h b/daemon/daemon.h
index f8441d1..45768bf 100644
--- a/daemon/daemon.h
+++ b/daemon/daemon.h
@@ -223,6 +223,7 @@ extern int sync_disks (void);
 /* Confirmed this is true up to ext4 from the Linux sources. */
 #define EXT2_LABEL_MAX 16
 extern int fstype_is_extfs (const char *fstype);
+extern int set_e2uuid_random (const char *device);
 
 /*-- in blkid.c --*/
 extern char *get_blkid_tag (const char *device, const char *tag);
@@ -265,6 +266,7 @@ extern int copy_xattrs (const char *src, const char *dest);
 /* Documented in xfs_admin(8). */
 #define XFS_LABEL_MAX 12
 extern int xfs_set_uuid (const char *device, const char *uuid);
+extern int xfs_set_uuid_random (const char *device);
 
 /*-- debug-bmap.c --*/
 extern char *debug_bmap (const char *subcmd, size_t argc, char *const *const
argv);
@@ -274,12 +276,14 @@ extern char *debug_bmap_device (const char *subcmd, size_t
argc, char *const *co
 /*-- in btrfs.c --*/
 extern char *btrfs_get_label (const char *device);
 extern int btrfs_set_uuid (const char *device, const char *uuid);
+extern int btrfs_set_uuid_random (const char *device);
 
 /*-- in ntfs.c --*/
 extern char *ntfs_get_label (const char *device);
 
 /*-- in swap.c --*/
 extern int swap_set_uuid (const char *device, const char *uuid);
+extern int swap_set_uuid_random (const char *device);
 
 /* ordinary daemon functions use these to indicate errors
  * NB: you don't need to prefix the string with the current command,
diff --git a/daemon/ext2.c b/daemon/ext2.c
index 8ef6d5f..625e5ae 100644
--- a/daemon/ext2.c
+++ b/daemon/ext2.c
@@ -159,6 +159,21 @@ do_set_e2uuid (const char *device, const char *uuid)
   return 0;
 }
 
+int
+set_e2uuid_random (const char *device)
+{
+  int r;
+  CLEANUP_FREE char *err = NULL;
+
+  r = command (NULL, &err, str_tune2fs, "-U", "random",
device, NULL);
+  if (r == -1) {
+    reply_with_error ("%s", err);
+    return -1;
+  }
+
+  return 0;
+}
+
 char *
 do_get_e2uuid (const char *device)
 {
diff --git a/daemon/swap.c b/daemon/swap.c
index 26fe30d..84d9606 100644
--- a/daemon/swap.c
+++ b/daemon/swap.c
@@ -255,3 +255,16 @@ swap_set_uuid (const char *device, const char *uuid)
 
   return 0;
 }
+
+int
+swap_set_uuid_random (const char *device)
+{
+  CLEANUP_FREE char *err = NULL;
+  CLEANUP_FREE char *uuid_random = NULL;
+
+  uuid_random = get_random_uuid ();
+  if (uuid_random == NULL)
+    return -1;
+
+  return swap_set_uuid (device, uuid_random);
+}
diff --git a/daemon/xfs.c b/daemon/xfs.c
index fb7acb4..2c93311 100644
--- a/daemon/xfs.c
+++ b/daemon/xfs.c
@@ -463,6 +463,13 @@ xfs_set_uuid (const char *device, const char *uuid)
 }
 
 int
+xfs_set_uuid_random (const char *device)
+{
+  optargs_bitmask = GUESTFS_XFS_ADMIN_UUID_BITMASK;
+  return do_xfs_admin (device, 0, 0, 0, 0, 0, NULL, "generate");
+}
+
+int
 do_xfs_admin (const char *device,
               int extunwritten, int imgfile, int v2log,
               int projid32bit,
-- 
2.1.0

Chen Hanxiao

2015-Jun-30 11:23 UTC

head link

[Libguestfs] [PATCH v4 7/7] New API: set_uuid_random

Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com>
---
 daemon/uuids.c                 | 31 +++++++++++++++++++++++++++++++
 generator/actions.ml           | 16 ++++++++++++++++
 src/MAX_PROC_NR                |  2 +-
 tests/btrfs/test-btrfs-misc.pl | 15 +++++++++++++++
 4 files changed, 63 insertions(+), 1 deletion(-)

diff --git a/daemon/uuids.c b/daemon/uuids.c
index 5238f3e..cd5787f 100644
--- a/daemon/uuids.c
+++ b/daemon/uuids.c
@@ -85,3 +85,34 @@ do_set_uuid (const char *device, const char *uuid)
 
   return r;
 }
+
+int
+do_set_uuid_random (const char *device)
+{
+  int r;
+
+  /* How we set the UUID depends on the filesystem type. */
+  CLEANUP_FREE char *vfs_type = get_blkid_tag (device, "TYPE");
+  if (vfs_type == NULL)
+    return -1;
+
+  if (fstype_is_extfs (vfs_type))
+    r = set_e2uuid_random (device);
+
+  else if (STREQ (vfs_type, "xfs"))
+    r = xfs_set_uuid_random (device);
+
+  else if (STREQ (vfs_type, "swap"))
+    r = swap_set_uuid_random (device);
+
+  else if (STREQ (vfs_type, "btrfs"))
+    r = btrfs_set_uuid_random (device);
+
+  else {
+    reply_with_error_errno (ENOTSUP, "don't know how to set the random
UUID for '%s' filesystems",
+                      vfs_type);
+    r = -1;
+  }
+
+  return r;
+}
diff --git a/generator/actions.ml b/generator/actions.ml
index 372e50e..52404ab 100644
--- a/generator/actions.ml
+++ b/generator/actions.ml
@@ -12623,6 +12623,22 @@ removed from the filesystem.
 The C<targetdev> needs to be same size or larger than the
C<srcdev>. Devices
 which are currently mounted are never allowed to be used as the
C<targetdev>." };
 
+  { defaults with
+    name = "set_uuid_random"; added = (1, 29, 48);
+    style = RErr, [Device "device"], [];
+    proc_nr = Some 456;
+    tests = [
+        InitBasicFS, Always, TestRun (
+            [["set_uuid_random"; "/dev/sda1"]]), [];
+      ];
+    shortdesc = "set a random UUID for the filesystem";
+    longdesc = "\
+Set the filesystem UUID on C<device> to a random UUID.
+
+Only some filesystem types support setting UUIDs.
+
+To read the UUID on a filesystem, call C<guestfs_vfs_uuid>." };
+
 ]
 
 (* Non-API meta-commands available only in guestfish.
diff --git a/src/MAX_PROC_NR b/src/MAX_PROC_NR
index 4930863..8d38505 100644
--- a/src/MAX_PROC_NR
+++ b/src/MAX_PROC_NR
@@ -1 +1 @@
-455
+456
diff --git a/tests/btrfs/test-btrfs-misc.pl b/tests/btrfs/test-btrfs-misc.pl
index 0643eeb..224d075 100755
--- a/tests/btrfs/test-btrfs-misc.pl
+++ b/tests/btrfs/test-btrfs-misc.pl
@@ -68,5 +68,20 @@ if ($@) {
     unless $uuid eq "12345678-1234-1234-1234-123456789012";
 }
 
+# Setting btrfs random UUID.
+eval {
+    $g->set_uuid_random ("/dev/sda1")
+};
+
+$err = $g->last_errno ();
+
+if ($@) {
+    if ($err == Errno::ENOTSUP()) {
+        warn "$0: skipping test for btrfs UUID change feature is not
available";
+    } elsif ($err) {
+        die $@;
+    }
+}
+
 $g->shutdown ();
 $g->close ();
-- 
2.1.0

Pino Toscano

2015-Jun-30 12:37 UTC

head link

Re: [Libguestfs] [PATCH v4 1/7] uuid: add support to change uuid of btrfs partition

In data martedì 30 giugno 2015 19:23:08, Chen Hanxiao ha
scritto:> btrfs-progs v4.1 add support to change uuid of btrfs fs.
> 
> Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com>
> ---
> [...]
> +# Setting btrfs UUID
> +eval {
> +    $g->set_uuid ("/dev/sda1",
"12345678-1234-1234-1234-123456789012");
> +};
> +
> +my $err = $g->last_errno ();
> +
> +if ($@) {
$@ contains the last Perl error, so it's better to check for it right
after the eval block, otherwise other functions might change it.
Also, $err can be moved in the if block.
> +    if ($err == Errno::ENOTSUP()) {
> +        warn "$0: skipping test for btrfs UUID change feature is not
available";
> +    } elsif ($err) {
"else" is enough here, as $err will surely be different than zero here
(otherwise we wouldn't be in this block).

Thanks,
-- 
Pino Toscano

Pino Toscano

2015-Jun-30 14:04 UTC

head link

Re: [Libguestfs] [PATCH v4 1/7] uuid: add support to change uuid of btrfs partition

Hi,

In data martedì 30 giugno 2015 19:23:08, Chen Hanxiao ha
scritto:> +int
> +btrfs_set_uuid (const char *device, const char *uuid)
> +{
> +  CLEANUP_FREE char *err = NULL;
> +  int r;
> +  int has_uuid_opts = test_btrfstune_uuid_opt ();
> +
> +  if (has_uuid_opts <= 0) {
> +    reply_with_error_errno (ENOTSUP, "btrfs filesystems' UUID
cannot be changed");
> +    return -1;
> +  }
Forgot one thing here: you can use a NOT_SUPPORTED(-1, "btrfs ...")
macro here.

-- 
Pino Toscano

Pino Toscano

2015-Jun-30 14:05 UTC

head link

Re: [Libguestfs] [PATCH v4 6/7] daemon: add functions for setting random uuid of fs

Hi,

In data martedì 30 giugno 2015 19:23:13, Chen Hanxiao ha
scritto:> Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com>
> ---
>  daemon/btrfs.c  | 21 +++++++++++++++++++++
>  daemon/daemon.h |  4 ++++
>  daemon/ext2.c   | 15 +++++++++++++++
>  daemon/swap.c   | 13 +++++++++++++
>  daemon/xfs.c    |  7 +++++++
>  5 files changed, 60 insertions(+)
> 
> diff --git a/daemon/btrfs.c b/daemon/btrfs.c
> index 4cdc6a7..2b0cae9 100644
> --- a/daemon/btrfs.c
> +++ b/daemon/btrfs.c
> @@ -874,6 +874,27 @@ btrfs_set_uuid (const char *device, const char *uuid)
>    return 0;
>  }
>  
> +int
> +btrfs_set_uuid_random (const char *device)
> +{
> +  CLEANUP_FREE char *err = NULL;
> +  int r;
> +  int has_uuid_opts = test_btrfstune_uuid_opt();
> +
> +  if (has_uuid_opts <= 0) {
> +    reply_with_error_errno (ENOTSUP, "btrfs filesystems' UUID
cannot be changed");
> +    return -1;
> +  }
You can use a NOT_SUPPORTED(-1, "btrfs ...") macro here.
> +
> +  r = commandr (NULL, &err, str_btrfstune, "-f",
"-u", device, NULL);
> +  if (r == -1) {
> +    reply_with_error ("%s: %s", device, err);
> +    return -1;
> +  }
> +
> +  return 0;
> +}
> +
>  /* Takes optional arguments, consult optargs_bitmask. */
>  int
>  do_btrfs_fsck (const char *device, int64_t superblock, int repair)
> diff --git a/daemon/daemon.h b/daemon/daemon.h
> index f8441d1..45768bf 100644
> --- a/daemon/daemon.h
> +++ b/daemon/daemon.h
> @@ -223,6 +223,7 @@ extern int sync_disks (void);
>  /* Confirmed this is true up to ext4 from the Linux sources. */
>  #define EXT2_LABEL_MAX 16
>  extern int fstype_is_extfs (const char *fstype);
> +extern int set_e2uuid_random (const char *device);
I'd say ext_set_uuid_random, fits better the naming.
>  /*-- in blkid.c --*/
>  extern char *get_blkid_tag (const char *device, const char *tag);
> @@ -265,6 +266,7 @@ extern int copy_xattrs (const char *src, const char
*dest);
>  /* Documented in xfs_admin(8). */
>  #define XFS_LABEL_MAX 12
>  extern int xfs_set_uuid (const char *device, const char *uuid);
> +extern int xfs_set_uuid_random (const char *device);
>  
>  /*-- debug-bmap.c --*/
>  extern char *debug_bmap (const char *subcmd, size_t argc, char *const
*const argv);
> @@ -274,12 +276,14 @@ extern char *debug_bmap_device (const char *subcmd,
size_t argc, char *const *co
>  /*-- in btrfs.c --*/
>  extern char *btrfs_get_label (const char *device);
>  extern int btrfs_set_uuid (const char *device, const char *uuid);
> +extern int btrfs_set_uuid_random (const char *device);
>  
>  /*-- in ntfs.c --*/
>  extern char *ntfs_get_label (const char *device);
>  
>  /*-- in swap.c --*/
>  extern int swap_set_uuid (const char *device, const char *uuid);
> +extern int swap_set_uuid_random (const char *device);
>  
>  /* ordinary daemon functions use these to indicate errors
>   * NB: you don't need to prefix the string with the current command,
> diff --git a/daemon/ext2.c b/daemon/ext2.c
> index 8ef6d5f..625e5ae 100644
> --- a/daemon/ext2.c
> +++ b/daemon/ext2.c
> @@ -159,6 +159,21 @@ do_set_e2uuid (const char *device, const char *uuid)
>    return 0;
>  }
>  
> +int
> +set_e2uuid_random (const char *device)
> +{
> +  int r;
> +  CLEANUP_FREE char *err = NULL;
> +
> +  r = command (NULL, &err, str_tune2fs, "-U",
"random", device, NULL);
> +  if (r == -1) {
> +    reply_with_error ("%s", err);
> +    return -1;
> +  }
> +
> +  return 0;
> +}
Just call do_set_e2uuid here.
>  char *
>  do_get_e2uuid (const char *device)
>  {
> diff --git a/daemon/swap.c b/daemon/swap.c
> index 26fe30d..84d9606 100644
> --- a/daemon/swap.c
> +++ b/daemon/swap.c
> @@ -255,3 +255,16 @@ swap_set_uuid (const char *device, const char *uuid)
>  
>    return 0;
>  }
> +
> +int
> +swap_set_uuid_random (const char *device)
> +{
> +  CLEANUP_FREE char *err = NULL;
> +  CLEANUP_FREE char *uuid_random = NULL;
> +
> +  uuid_random = get_random_uuid ();
> +  if (uuid_random == NULL)
> +    return -1;
> +
> +  return swap_set_uuid (device, uuid_random);
> +}
There is no need for a separate _random of this, as this is basically
get_random_uuid + set_uuid. Just inline them into do_set_uuid_random
directly.
> diff --git a/daemon/xfs.c b/daemon/xfs.c
> index fb7acb4..2c93311 100644
> --- a/daemon/xfs.c
> +++ b/daemon/xfs.c
> @@ -463,6 +463,13 @@ xfs_set_uuid (const char *device, const char *uuid)
>  }
>  
>  int
> +xfs_set_uuid_random (const char *device)
> +{
> +  optargs_bitmask = GUESTFS_XFS_ADMIN_UUID_BITMASK;
> +  return do_xfs_admin (device, 0, 0, 0, 0, 0, NULL, "generate");
> +}
> +
> +int
>  do_xfs_admin (const char *device,
>                int extunwritten, int imgfile, int v2log,
>                int projid32bit,
> 
Thanks,
-- 
Pino Toscano

Pino Toscano

2015-Jun-30 14:06 UTC

head link

Re: [Libguestfs] [PATCH v4 7/7] New API: set_uuid_random

In data martedì 30 giugno 2015 19:23:14, Chen Hanxiao ha
scritto:> Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com>
> ---
>  daemon/uuids.c                 | 31 +++++++++++++++++++++++++++++++
>  generator/actions.ml           | 16 ++++++++++++++++
>  src/MAX_PROC_NR                |  2 +-
>  tests/btrfs/test-btrfs-misc.pl | 15 +++++++++++++++
>  4 files changed, 63 insertions(+), 1 deletion(-)
> 
> diff --git a/daemon/uuids.c b/daemon/uuids.c
> index 5238f3e..cd5787f 100644
> --- a/daemon/uuids.c
> +++ b/daemon/uuids.c
> @@ -85,3 +85,34 @@ do_set_uuid (const char *device, const char *uuid)
>  
>    return r;
>  }
> +
> +int
> +do_set_uuid_random (const char *device)
> +{
> +  int r;
> +
> +  /* How we set the UUID depends on the filesystem type. */
> +  CLEANUP_FREE char *vfs_type = get_blkid_tag (device, "TYPE");
> +  if (vfs_type == NULL)
> +    return -1;
> +
> +  if (fstype_is_extfs (vfs_type))
> +    r = set_e2uuid_random (device);
> +
> +  else if (STREQ (vfs_type, "xfs"))
> +    r = xfs_set_uuid_random (device);
> +
> +  else if (STREQ (vfs_type, "swap"))
> +    r = swap_set_uuid_random (device);
> +
> +  else if (STREQ (vfs_type, "btrfs"))
> +    r = btrfs_set_uuid_random (device);
> +
> +  else {
> +    reply_with_error_errno (ENOTSUP, "don't know how to set the
random UUID for '%s' filesystems",
> +                      vfs_type);
You can use a NOT_SUPPORTED(-1, "...") macro here.
> +    r = -1;
> +  }
> +
> +  return r;
> +}
> diff --git a/generator/actions.ml b/generator/actions.ml
> index 372e50e..52404ab 100644
> --- a/generator/actions.ml
> +++ b/generator/actions.ml
> @@ -12623,6 +12623,22 @@ removed from the filesystem.
>  The C<targetdev> needs to be same size or larger than the
C<srcdev>. Devices
>  which are currently mounted are never allowed to be used as the
C<targetdev>." };
>  
> +  { defaults with
> +    name = "set_uuid_random"; added = (1, 29, 48);
> +    style = RErr, [Device "device"], [];
> +    proc_nr = Some 456;
> +    tests = [
> +        InitBasicFS, Always, TestRun (
> +            [["set_uuid_random"; "/dev/sda1"]]), [];
> +      ];
> +    shortdesc = "set a random UUID for the filesystem";
> +    longdesc = "\
> +Set the filesystem UUID on C<device> to a random UUID.
> +
> +Only some filesystem types support setting UUIDs.
> +
> +To read the UUID on a filesystem, call C<guestfs_vfs_uuid>." };
> +
>  ]
>  
>  (* Non-API meta-commands available only in guestfish.
> diff --git a/src/MAX_PROC_NR b/src/MAX_PROC_NR
> index 4930863..8d38505 100644
> --- a/src/MAX_PROC_NR
> +++ b/src/MAX_PROC_NR
> @@ -1 +1 @@
> -455
> +456
> diff --git a/tests/btrfs/test-btrfs-misc.pl
b/tests/btrfs/test-btrfs-misc.pl
> index 0643eeb..224d075 100755
> --- a/tests/btrfs/test-btrfs-misc.pl
> +++ b/tests/btrfs/test-btrfs-misc.pl
> @@ -68,5 +68,20 @@ if ($@) {
>      unless $uuid eq "12345678-1234-1234-1234-123456789012";
>  }
>  
> +# Setting btrfs random UUID.
> +eval {
> +    $g->set_uuid_random ("/dev/sda1")
> +};
> +
> +$err = $g->last_errno ();
> +
> +if ($@) {
> +    if ($err == Errno::ENOTSUP()) {
> +        warn "$0: skipping test for btrfs UUID change feature is not
available";
> +    } elsif ($err) {
> +        die $@;
> +    }
> +}
Some note as in patch 1 about $@ and $err.

Thanks,
-- 
Pino Toscano

Pino Toscano

2015-Jun-30 14:09 UTC

head link

Re: [Libguestfs] [PATCH v4 0/7] uuid: add btrfs uuid change support and set_uuid_random

In data martedì 30 giugno 2015 19:23:07, Chen Hanxiao ha
scritto:> - Btrfs-progs v4.1 introduced new feature of changing
>   uuid of btrfs partition.
>   This patch add support of this.
> 
> - Introduce set_uuid_random
> 
> - uuids.c did a lot of deplicated work for changing uuid
>   of fs. Use existing functions.
> 
> v4: introduce get_random_uuid
>     improve testcases
>     squash internal API patches
> v3.1: fix typos
> v3: set errno if feature is not available.
> 
> Chen Hanxiao (7):
>   uuid: add support to change uuid of btrfs partition
>   uuid: use existing function of ext2
>   uuid: use newly introduced xfs_set_uuid of xfs
>   uuid: use newly introduced swap_set_uuid
>   daemon: add get_random_uuid
>   daemon: add functions for setting random uuid of fs
>   New API: set_uuid_random
> 
>  appliance/packagelist.in       |  1 +
>  daemon/btrfs.c                 | 81
++++++++++++++++++++++++++++++++++++++++++
>  daemon/daemon.h                | 11 ++++++
>  daemon/ext2.c                  | 15 ++++++++
>  daemon/guestfsd.c              | 19 ++++++++++
>  daemon/swap.c                  | 29 +++++++++++++++
>  daemon/uuids.c                 | 71 +++++++++++++++++-------------------
>  daemon/xfs.c                   | 14 ++++++++
>  generator/actions.ml           | 16 +++++++++
>  src/MAX_PROC_NR                |  2 +-
>  tests/btrfs/test-btrfs-misc.pl | 36 +++++++++++++++++++
>  11 files changed, 255 insertions(+), 40 deletions(-)
This patch series is getting better now.
I pushed patches #2, #3 & #5, as they were okay. #4 is okay too,
although it doesn't apply without #1.

Also, please squash patches #6 and #7 together, as those
implementations are for set_uuid_random.

Thanks for the work,
-- 
Pino Toscano

Chen, Hanxiao

2015-Jul-01 08:53 UTC

head link

Re: [Libguestfs] [PATCH v4 0/7] uuid: add btrfs uuid change support and set_uuid_random

> -----Original Message-----
> From: libguestfs-bounces@redhat.com [mailto:libguestfs-bounces@redhat.com]
On
> Behalf Of Pino Toscano
> Sent: Tuesday, June 30, 2015 10:09 PM
> To: libguestfs@redhat.com
> Subject: Re: [Libguestfs] [PATCH v4 0/7] uuid: add btrfs uuid change
support and
> set_uuid_random
> 
> In data martedì 30 giugno 2015 19:23:07, Chen Hanxiao ha scritto:
> > - Btrfs-progs v4.1 introduced new feature of changing
> >   uuid of btrfs partition.
> >   This patch add support of this.
> >
> > - Introduce set_uuid_random
> >
> > - uuids.c did a lot of deplicated work for changing uuid
> >   of fs. Use existing functions.
> >
> > v4: introduce get_random_uuid
> >     improve testcases
> >     squash internal API patches
> > v3.1: fix typos
> > v3: set errno if feature is not available.
> >
> > Chen Hanxiao (7):
> >   uuid: add support to change uuid of btrfs partition
> >   uuid: use existing function of ext2
> >   uuid: use newly introduced xfs_set_uuid of xfs
> >   uuid: use newly introduced swap_set_uuid
> >   daemon: add get_random_uuid
> >   daemon: add functions for setting random uuid of fs
> >   New API: set_uuid_random
> >
> >  appliance/packagelist.in       |  1 +
> >  daemon/btrfs.c                 | 81
++++++++++++++++++++++++++++++++++++++++++
> >  daemon/daemon.h                | 11 ++++++
> >  daemon/ext2.c                  | 15 ++++++++
> >  daemon/guestfsd.c              | 19 ++++++++++
> >  daemon/swap.c                  | 29 +++++++++++++++
> >  daemon/uuids.c                 | 71
+++++++++++++++++-------------------
> >  daemon/xfs.c                   | 14 ++++++++
> >  generator/actions.ml           | 16 +++++++++
> >  src/MAX_PROC_NR                |  2 +-
> >  tests/btrfs/test-btrfs-misc.pl | 36 +++++++++++++++++++
> >  11 files changed, 255 insertions(+), 40 deletions(-)
> 
> This patch series is getting better now.
> I pushed patches #2, #3 & #5, as they were okay. #4 is okay too,
> although it doesn't apply without #1.
> 
> Also, please squash patches #6 and #7 together, as those
> implementations are for set_uuid_random.
Fine, although #6 + #7 is a little big.
> 
> Thanks for the work,
Thanks for your comments and patience.

Regards,
- Chen

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