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Chen Hanxiao

2015-Jun-26 09:35 UTC

[Libguestfs] [PATCH v3.1 0/9] 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.

v3.1: fix typos
v3: set errno if feature is not available.

Chen Hanxiao (9):
  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
  New API: btrfs_set_uuid_random
  New API: set_e2uuid_random
  New API: swap_set_uuid_random
  New API: xfs_set_uuid_random
  New API: set_uuid_random

 daemon/btrfs.c                 | 81 ++++++++++++++++++++++++++++++++++++++++++
 daemon/daemon.h                | 10 ++++++
 daemon/ext2.c                  | 15 ++++++++
 daemon/swap.c                  | 48 +++++++++++++++++++++++++
 daemon/uuids.c                 | 71 +++++++++++++++++-------------------
 daemon/xfs.c                   | 14 ++++++++
 generator/actions.ml           | 16 +++++++++
 src/MAX_PROC_NR                |  2 +-
 tests/btrfs/test-btrfs-misc.pl | 28 +++++++++++++++
 9 files changed, 245 insertions(+), 40 deletions(-)

-- 
2.1.0

Chen Hanxiao

2015-Jun-26 09:35 UTC

head link

[Libguestfs] [PATCH v3.1 1/9] 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>
---
v3.1: fix a typo
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 | 17 ++++++++++++
 4 files changed, 80 insertions(+), 4 deletions(-)

diff --git a/daemon/btrfs.c b/daemon/btrfs.c
index 20e5e6b..a69c512 100644
--- a/daemon/btrfs.c
+++ b/daemon/btrfs.c
@@ -790,6 +790,44 @@ 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, 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)
 {
@@ -807,6 +845,28 @@ 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 136e9a9..b74ba3c 100644
--- a/daemon/daemon.h
+++ b/daemon/daemon.h
@@ -268,6 +268,7 @@ 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..b47caab 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 +48,21 @@ 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");
+};
+# FIXME: ignore ESRCH
+my $err = $g->last_errno ();
+
+if ($err == 0) {
+    my $uuid = $g->vfs_uuid ("/dev/sda1");
+    die "unexpected uuid expecting
+     '12345678-1234-1234-1234-123456789012' but got
'$uuid'"
+    unless $uuid eq "12345678-1234-1234-1234-123456789012";
+} elsif ($err == Errno::ENOTSUP()) {
+    warn "$0: skipping test for btrfs UUID change feature is not
available\n";
+}
+
 $g->shutdown ();
 $g->close ();
-- 
2.1.0

Chen Hanxiao

2015-Jun-26 09:35 UTC

head link

[Libguestfs] [PATCH v3.1 2/9] 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-26 09:35 UTC

head link

[Libguestfs] [PATCH v3.1 3/9] 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 b74ba3c..7d5691f 100644
--- a/daemon/daemon.h
+++ b/daemon/daemon.h
@@ -260,6 +260,7 @@ 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-26 09:35 UTC

head link

[Libguestfs] [PATCH v3.1 4/9] 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 7d5691f..d4c8c11 100644
--- a/daemon/daemon.h
+++ b/daemon/daemon.h
@@ -274,6 +274,9 @@ 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-26 09:35 UTC

head link

[Libguestfs] [PATCH v3.1 5/9] New API: btrfs_set_uuid_random

Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com>
---
 daemon/btrfs.c  | 21 +++++++++++++++++++++
 daemon/daemon.h |  1 +
 2 files changed, 22 insertions(+)

diff --git a/daemon/btrfs.c b/daemon/btrfs.c
index a69c512..a3f3590 100644
--- a/daemon/btrfs.c
+++ b/daemon/btrfs.c
@@ -867,6 +867,27 @@ 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 d4c8c11..5087327 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);
+extern int btrfs_set_uuid_random (const char *device);
 
 /*-- in ntfs.c --*/
 extern char *ntfs_get_label (const char *device);
-- 
2.1.0

Chen Hanxiao

2015-Jun-26 09:35 UTC

head link

[Libguestfs] [PATCH v3.1 6/9] New API: set_e2uuid_random

Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com>
---
 daemon/daemon.h |  1 +
 daemon/ext2.c   | 15 +++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/daemon/daemon.h b/daemon/daemon.h
index 5087327..9c8476c 100644
--- a/daemon/daemon.h
+++ b/daemon/daemon.h
@@ -219,6 +219,7 @@ 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);
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)
 {
-- 
2.1.0

Chen Hanxiao

2015-Jun-26 09:35 UTC

head link

[Libguestfs] [PATCH v3.1 7/9] New API: swap_set_uuid_random

Also introduce get_random_uuid()

Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com>
---
 daemon/daemon.h |  2 ++
 daemon/swap.c   | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/daemon/daemon.h b/daemon/daemon.h
index 9c8476c..6c07c6a 100644
--- a/daemon/daemon.h
+++ b/daemon/daemon.h
@@ -278,6 +278,8 @@ 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);
+extern char *get_random_uuid (void);
 
 /* 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/swap.c b/daemon/swap.c
index 26fe30d..923adb2 100644
--- a/daemon/swap.c
+++ b/daemon/swap.c
@@ -34,6 +34,7 @@ GUESTFSD_EXT_CMD(str_mkswap, mkswap);
 GUESTFSD_EXT_CMD(str_swapon, swapon);
 GUESTFSD_EXT_CMD(str_swapoff, swapoff);
 GUESTFSD_EXT_CMD(str_swaplabel, swaplabel);
+GUESTFSD_EXT_CMD(str_uuidgen, uuidgen);
 
 /* Confirmed this is true for Linux swap partitions from the Linux sources. */
 #define SWAP_LABEL_MAX 16
@@ -255,3 +256,34 @@ swap_set_uuid (const char *device, const char *uuid)
 
   return 0;
 }
+
+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;
+
+}
+
+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);
+}
-- 
2.1.0

Chen Hanxiao

2015-Jun-26 09:35 UTC

head link

[Libguestfs] [PATCH v3.1 8/9] New API: xfs_set_uuid_random

Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com>
---
 daemon/daemon.h | 1 +
 daemon/xfs.c    | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/daemon/daemon.h b/daemon/daemon.h
index 6c07c6a..6d98eb9 100644
--- a/daemon/daemon.h
+++ b/daemon/daemon.h
@@ -262,6 +262,7 @@ 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);
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-26 09:35 UTC

head link

[Libguestfs] [PATCH v3.1 9/9] 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 | 11 +++++++++++
 4 files changed, 59 insertions(+), 1 deletion(-)

diff --git a/daemon/uuids.c b/daemon/uuids.c
index 5238f3e..4530491 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 ("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 d5e5ccf..0328858 100644
--- a/generator/actions.ml
+++ b/generator/actions.ml
@@ -12593,6 +12593,22 @@ numbered C<partnum> on device C<device>.
 
 It returns C<primary>, C<logical>, or C<extended>." };
 
+  { defaults with
+    name = "set_uuid_random"; added = (1, 29, 47);
+    style = RErr, [Device "device"], [];
+    proc_nr = Some 455;
+    tests = [
+        InitBasicFS, Always, TestRun (
+            [["set_uuid_random"; "/dev/sda1"]]), [];
+      ];
+    shortdesc = "set the random filesystem UUID";
+    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 515f19a..4930863 100644
--- a/src/MAX_PROC_NR
+++ b/src/MAX_PROC_NR
@@ -1 +1 @@
-454
+455
diff --git a/tests/btrfs/test-btrfs-misc.pl b/tests/btrfs/test-btrfs-misc.pl
index b47caab..4982f0d 100755
--- a/tests/btrfs/test-btrfs-misc.pl
+++ b/tests/btrfs/test-btrfs-misc.pl
@@ -64,5 +64,16 @@ if ($err == 0) {
     warn "$0: skipping test for btrfs UUID change feature is not
available\n";
 }
 
+# Setting btrfs random UUID.
+eval {
+    $g->set_uuid_random ("/dev/sda1")
+};
+# FIXME: ignore ESRCH
+my $err = $g->last_errno ();
+
+if ($err == Errno::ENOTSUP()) {
+    warn "$0: skipping test for btrfs UUID change feature is not
available\n";
+}
+
 $g->shutdown ();
 $g->close ();
-- 
2.1.0

Pino Toscano

2015-Jun-26 12:12 UTC

head link

Re: [Libguestfs] [PATCH v3.1 1/9] uuid: add support to change uuid of btrfs partition

In data venerdì 26 giugno 2015 17:35:36, 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>
> ---
> v3.1: fix a typo
> 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 | 17 ++++++++++++
>  4 files changed, 80 insertions(+), 4 deletions(-)
> 
> diff --git a/daemon/btrfs.c b/daemon/btrfs.c
> index 20e5e6b..a69c512 100644
> --- a/daemon/btrfs.c
> +++ b/daemon/btrfs.c
> @@ -790,6 +790,44 @@ 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, NULL);
> +
> +  if (r == -1) {
> +    reply_with_error ("btrfstune: %s", err);
> +    return -1;
> +  }
> +
> +  /* FIXME currently btrfstune do not support '--help'.
So --help should be passed anyway to the btrfstune invocation, so with
newer versions hopefully there will not be complaints about it anymore.
> +   * 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)
>  {
> @@ -807,6 +845,28 @@ 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 136e9a9..b74ba3c 100644
> --- a/daemon/daemon.h
> +++ b/daemon/daemon.h
> @@ -268,6 +268,7 @@ 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..b47caab 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 +48,21 @@ 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");
> +};
> +# FIXME: ignore ESRCH
What is ESRCH about?
> +my $err = $g->last_errno ();
> +
> +if ($err == 0) {
> +    my $uuid = $g->vfs_uuid ("/dev/sda1");
> +    die "unexpected uuid expecting
> +     '12345678-1234-1234-1234-123456789012' but got
'$uuid'"
> +    unless $uuid eq "12345678-1234-1234-1234-123456789012";
> +} elsif ($err == Errno::ENOTSUP()) {
> +    warn "$0: skipping test for btrfs UUID change feature is not
available\n";
> +}
IIRC 'warn' prints the newline at the end already.

This is missing to check when $err is a valid error.

Thanks,
-- 
Pino Toscano

Pino Toscano

2015-Jun-26 13:00 UTC

head link

Re: [Libguestfs] [PATCH v3.1 7/9] New API: swap_set_uuid_random

In data venerdì 26 giugno 2015 17:35:42, Chen Hanxiao ha
scritto:> Also introduce get_random_uuid()
> 
> Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com>
> ---
>  daemon/daemon.h |  2 ++
>  daemon/swap.c   | 32 ++++++++++++++++++++++++++++++++
>  2 files changed, 34 insertions(+)
> 
> diff --git a/daemon/daemon.h b/daemon/daemon.h
> index 9c8476c..6c07c6a 100644
> --- a/daemon/daemon.h
> +++ b/daemon/daemon.h
> @@ -278,6 +278,8 @@ 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);
> +extern char *get_random_uuid (void);
>  
>  /* 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/swap.c b/daemon/swap.c
> index 26fe30d..923adb2 100644
> --- a/daemon/swap.c
> +++ b/daemon/swap.c
> @@ -34,6 +34,7 @@ GUESTFSD_EXT_CMD(str_mkswap, mkswap);
>  GUESTFSD_EXT_CMD(str_swapon, swapon);
>  GUESTFSD_EXT_CMD(str_swapoff, swapoff);
>  GUESTFSD_EXT_CMD(str_swaplabel, swaplabel);
> +GUESTFSD_EXT_CMD(str_uuidgen, uuidgen);
>  
>  /* Confirmed this is true for Linux swap partitions from the Linux
sources. */
>  #define SWAP_LABEL_MAX 16
> @@ -255,3 +256,34 @@ swap_set_uuid (const char *device, const char *uuid)
>  
>    return 0;
>  }
> +
> +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;
> +
> +}
The addition of the get_random_uuid() is worth an own commit.  Also,
it is not specific to swap, so I'd say to put it directly in guestfsd.c,
named like uuidgen() (much like the OCaml equivalent in Common_utils).

Furthermore, you should make sure uuidgen is actually in the appliance:
while in Fedora is in util-linux (already part of the appliance), e.g.
in Debian/Ubuntu is in uuid-runtime. Thus you need to add that package
to the Debian ones in appliance/packagelist.in.
> +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);
> +}
This is nothing specific for swap, and could just be done directly in
the set_uuid_random implementation, for all the filesystems we have
tools to change their UUIDs (so swap only so far).

In practice something like:

   else if (STREQ (vfs_type, "swap")) {
     CLEANUP_FREE char *uuid = uuidgen ();
     if (uuid == NULL)
       return -1;

     r = swap_set_uuid (device, uuid);
   }

Thanks,
-- 
Pino Toscano

Pino Toscano

2015-Jun-26 13:09 UTC

head link

Re: [Libguestfs] [PATCH v3.1 9/9] New API: set_uuid_random

In data venerdì 26 giugno 2015 17:35:44, 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 | 11 +++++++++++
>  4 files changed, 59 insertions(+), 1 deletion(-)
> 
> diff --git a/daemon/uuids.c b/daemon/uuids.c
> index 5238f3e..4530491 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 ("don't know how to set the random UUID for
'%s' filesystems",
> +                      vfs_type);
> +    r = -1;
Being a new API, we could make this return ENOTSUP, documenting this
error on unsupported filesystems. This way, users could know an error
is due to a filesystem not supported by this API, instead of a real
failure of one of the programs used.
> +  }
> +
> +  return r;
> +}
> diff --git a/generator/actions.ml b/generator/actions.ml
> index d5e5ccf..0328858 100644
> --- a/generator/actions.ml
> +++ b/generator/actions.ml
> @@ -12593,6 +12593,22 @@ numbered C<partnum> on device
C<device>.
>  
>  It returns C<primary>, C<logical>, or C<extended>."
};
>  
> +  { defaults with
> +    name = "set_uuid_random"; added = (1, 29, 47);
> +    style = RErr, [Device "device"], [];
> +    proc_nr = Some 455;
> +    tests = [
> +        InitBasicFS, Always, TestRun (
> +            [["set_uuid_random"; "/dev/sda1"]]), [];
> +      ];
> +    shortdesc = "set the random filesystem UUID";
This sounds like it is setting some particular random UUID. I'd be
better as

 "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 515f19a..4930863 100644
> --- a/src/MAX_PROC_NR
> +++ b/src/MAX_PROC_NR
> @@ -1 +1 @@
> -454
> +455
> diff --git a/tests/btrfs/test-btrfs-misc.pl
b/tests/btrfs/test-btrfs-misc.pl
> index b47caab..4982f0d 100755
> --- a/tests/btrfs/test-btrfs-misc.pl
> +++ b/tests/btrfs/test-btrfs-misc.pl
> @@ -64,5 +64,16 @@ if ($err == 0) {
>      warn "$0: skipping test for btrfs UUID change feature is not
available\n";
>  }
>  
> +# Setting btrfs random UUID.
> +eval {
> +    $g->set_uuid_random ("/dev/sda1")
> +};
> +# FIXME: ignore ESRCH
What is ESRCH about?
> +my $err = $g->last_errno ();
> +
> +if ($err == Errno::ENOTSUP()) {
> +    warn "$0: skipping test for btrfs UUID change feature is not
available\n";
> +}
You need to care in case $err is non-zero, that is a real error.

Thanks,
-- 
Pino Toscano

Pino Toscano

2015-Jun-26 13:11 UTC

head link

Re: [Libguestfs] [PATCH v3.1 0/9] uuid: add btrfs uuid change support and set_uuid_random

In data venerdì 26 giugno 2015 17:35:35, 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.
> 
> v3.1: fix typos
> v3: set errno if feature is not available.
> 
> Chen Hanxiao (9):
> [...]
>   uuid: use existing function of ext2
>   uuid: use newly introduced xfs_set_uuid of xfs
>   uuid: use newly introduced swap_set_uuid
These commits look good.
>   New API: btrfs_set_uuid_random
>   New API: set_e2uuid_random
>   New API: swap_set_uuid_random
>   New API: xfs_set_uuid_random
>   New API: set_uuid_random
New internal functions are not "new API" -- that is used for
user-facing
APIs, such as set_uuid_random.

Could you also please squash them together, since they are not really
different changes from the set_uuid_random addition?

Commits 5,6,8 look good as well.

Thanks,
-- 
Pino Toscano

Chen, Hanxiao

2015-Jun-29 03:48 UTC

head link

Re: [Libguestfs] [PATCH v3.1 0/9] 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: Friday, June 26, 2015 9:11 PM
> To: libguestfs@redhat.com
> Subject: Re: [Libguestfs] [PATCH v3.1 0/9] uuid: add btrfs uuid change
support and
> set_uuid_random
> 
> In data venerdì 26 giugno 2015 17:35:35, 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.
> >
> > v3.1: fix typos
> > v3: set errno if feature is not available.
> >
> > Chen Hanxiao (9):
> > [...]
> >   uuid: use existing function of ext2
> >   uuid: use newly introduced xfs_set_uuid of xfs
> >   uuid: use newly introduced swap_set_uuid
> 
> These commits look good.
> 
> >   New API: btrfs_set_uuid_random
> >   New API: set_e2uuid_random
> >   New API: swap_set_uuid_random
> >   New API: xfs_set_uuid_random
> >   New API: set_uuid_random
> 
> New internal functions are not "new API" -- that is used for
user-facing
> APIs, such as set_uuid_random.
> 
> Could you also please squash them together, since they are not really
> different changes from the set_uuid_random addition?
> 
> Commits 5,6,8 look good as well.

I'll squash all internal api into one patch and resend.

Regards,
- Chen

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