[Libguestfs] [PATCH 4/4] New API: set-label, for setting a label on any filesystem.
Richard W.M. Jones
rjones at redhat.com
Mon Feb 27 17:34:22 UTC 2012
From: "Richard W.M. Jones" <rjones at redhat.com>
Currently only ext2/3/4 and (newly) NTFS are supported.
This change also deprecates set-e2label.
---
TODO | 4 -
daemon/Makefile.am | 1 +
daemon/daemon.h | 3 +
daemon/ext2.c | 26 +-------
daemon/labels.c | 100 +++++++++++++++++++++++++++++
generator/generator_actions.ml | 28 ++++++++-
po/POTFILES.in | 1 +
src/MAX_PROC_NR | 2 +-
tests/guests/guest-aux/make-debian-img.sh | 2 +-
tests/guests/guest-aux/make-fedora-img.pl | 4 +-
tests/guests/guest-aux/make-ubuntu-img.sh | 2 +-
11 files changed, 137 insertions(+), 36 deletions(-)
create mode 100644 daemon/labels.c
diff --git a/TODO b/TODO
index 9dafb4d..499c345 100644
--- a/TODO
+++ b/TODO
@@ -381,10 +381,6 @@ More ntfs tools
ntfsprogs actually has a lot more useful tools than we currently
use. Interesting ones are:
-ntfslabel: display or change filesystem label (we should unify all
- set*label APIs into a single set_vfs_label which can deal with any
- filesystem)
-
ntfscluster: display file(s) that occupy a cluster or sector
ntfsinfo: print various information about NTFS volume and files
diff --git a/daemon/Makefile.am b/daemon/Makefile.am
index 2dd8149..74d24fc 100644
--- a/daemon/Makefile.am
+++ b/daemon/Makefile.am
@@ -125,6 +125,7 @@ guestfsd_SOURCES = \
inotify.c \
internal.c \
is.c \
+ labels.c \
link.c \
ls.c \
luks.c \
diff --git a/daemon/daemon.h b/daemon/daemon.h
index c92e110..c45a7fe 100644
--- a/daemon/daemon.h
+++ b/daemon/daemon.h
@@ -132,6 +132,9 @@ extern int sync_disks (void);
/*-- in ext2.c --*/
extern int e2prog (char *name); /* Massive hack for RHEL 5. */
+/* Confirmed this is true up to ext4 from the Linux sources. */
+#define EXT2_LABEL_MAX 16
+
/*-- in lvm.c --*/
extern int lv_canonical (const char *device, char **ret);
diff --git a/daemon/ext2.c b/daemon/ext2.c
index a643935..02cd68a 100644
--- a/daemon/ext2.c
+++ b/daemon/ext2.c
@@ -29,9 +29,6 @@
#include "c-ctype.h"
#include "actions.h"
-/* Confirmed this is true up to ext4 from the Linux sources. */
-#define EXT2_LABEL_MAX 16
-
#define MAX_ARGS 64
/* Choose which tools like mke2fs to use. For RHEL 5 (only) there
@@ -154,28 +151,7 @@ do_tune2fs_l (const char *device)
int
do_set_e2label (const char *device, const char *label)
{
- int r;
- char *err;
-
- char prog[] = "e2label";
- if (e2prog (prog) == -1)
- return -1;
-
- if (strlen (label) > EXT2_LABEL_MAX) {
- reply_with_error ("%s: ext2 labels are limited to %d bytes",
- label, EXT2_LABEL_MAX);
- return -1;
- }
-
- r = command (NULL, &err, prog, device, label, NULL);
- if (r == -1) {
- reply_with_error ("%s", err);
- free (err);
- return -1;
- }
-
- free (err);
- return 0;
+ return do_set_label (device, label);
}
char *
diff --git a/daemon/labels.c b/daemon/labels.c
new file mode 100644
index 0000000..7117698
--- /dev/null
+++ b/daemon/labels.c
@@ -0,0 +1,100 @@
+/* libguestfs - the guestfsd daemon
+ * Copyright (C) 2012 Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "daemon.h"
+#include "actions.h"
+#include "optgroups.h"
+
+static int
+e2label (const char *device, const char *label)
+{
+ int r;
+ char *err;
+
+ char prog[] = "e2label";
+ if (e2prog (prog) == -1)
+ return -1;
+
+ if (strlen (label) > EXT2_LABEL_MAX) {
+ reply_with_error ("%s: ext2 labels are limited to %d bytes",
+ label, EXT2_LABEL_MAX);
+ return -1;
+ }
+
+ r = command (NULL, &err, prog, device, label, NULL);
+ if (r == -1) {
+ reply_with_error ("%s", err);
+ free (err);
+ return -1;
+ }
+
+ free (err);
+ return 0;
+}
+
+static int
+ntfslabel (const char *device, const char *label)
+{
+ int r;
+ char *err;
+
+ /* XXX We should check if the label is longer than 128 unicode
+ * characters and return an error. This is not so easy since we
+ * don't have the required libraries.
+ */
+ r = command (NULL, &err, "ntfslabel", device, label, NULL);
+ if (r == -1) {
+ reply_with_error ("%s", err);
+ free (err);
+ return -1;
+ }
+
+ free (err);
+ return 0;
+}
+
+int
+do_set_label (const char *device, const char *label)
+{
+ char *vfs_type;
+
+ /* How we set the label depends on the filesystem type. */
+ vfs_type = do_vfs_type (device);
+ if (vfs_type == NULL)
+ return -1;
+
+ if (STREQ (vfs_type, "ext2") || STREQ (vfs_type, "ext3")
+ || STREQ (vfs_type, "ext4"))
+ return e2label (device, label);
+
+ else if (STREQ (vfs_type, "ntfs"))
+ return ntfslabel (device, label);
+
+ else {
+ reply_with_error ("don't know how to set the label for '%s' filesystems",
+ vfs_type);
+ return -1;
+ }
+}
diff --git a/generator/generator_actions.ml b/generator/generator_actions.ml
index 2d24e6a..d9f88af 100644
--- a/generator/generator_actions.ml
+++ b/generator/generator_actions.ml
@@ -3007,7 +3007,7 @@ The implementation uses the C<pvremove> command which refuses to
wipe physical volumes that contain any volume groups, so you have
to remove those first.");
- ("set_e2label", (RErr, [Device "device"; String "label"], []), 80, [],
+ ("set_e2label", (RErr, [Device "device"; String "label"], []), 80, [DeprecatedBy "set_label"],
[InitBasicFS, Always, TestOutput (
[["set_e2label"; "/dev/sda1"; "testlabel"];
["get_e2label"; "/dev/sda1"]], "testlabel")],
@@ -5698,7 +5698,7 @@ a file in the host and attach it as a device.");
("vfs_label", (RString "label", [Device "device"], []), 253, [],
[InitBasicFS, Always, TestOutput (
- [["set_e2label"; "/dev/sda1"; "LTEST"];
+ [["set_label"; "/dev/sda1"; "LTEST"];
["vfs_label"; "/dev/sda1"]], "LTEST")],
"get the filesystem label",
"\
@@ -6709,6 +6709,30 @@ Restore the C<backupfile> (from a previous call to
C<guestfs_ntfsclone_out>) to C<device>, overwriting
any existing contents of this device.");
+ ("set_label", (RErr, [Device "device"; String "label"], []), 310, [],
+ [InitBasicFS, Always, TestOutput (
+ [["set_label"; "/dev/sda1"; "testlabel"];
+ ["vfs_label"; "/dev/sda1"]], "testlabel");
+ InitPartition, IfAvailable "ntfs3g", TestOutput (
+ [["mkfs"; "ntfs"; "/dev/sda1"];
+ ["set_label"; "/dev/sda1"; "testlabel2"];
+ ["vfs_label"; "/dev/sda1"]], "testlabel2");
+ InitPartition, Always, TestLastFail (
+ [["zero"; "/dev/sda1"];
+ ["set_label"; "/dev/sda1"; "testlabel2"]])],
+ "set filesystem label",
+ "\
+Set the filesystem label on C<device> to C<label>.
+
+Only some filesystem types support labels, and libguestfs supports
+setting labels on only a subset of these.
+
+On ext2/3/4 filesystems, labels are limited to 16 bytes.
+
+On NTFS filesystems, labels are limited to 128 unicode characters.
+
+To read the label on a filesystem, call C<guestfs_vfs_label>.");
+
]
let all_functions = non_daemon_functions @ daemon_functions
diff --git a/po/POTFILES.in b/po/POTFILES.in
index bed1f65..22e39b1 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -44,6 +44,7 @@ daemon/initrd.c
daemon/inotify.c
daemon/internal.c
daemon/is.c
+daemon/labels.c
daemon/link.c
daemon/ls.c
daemon/luks.c
diff --git a/src/MAX_PROC_NR b/src/MAX_PROC_NR
index 7536e3d..54ea97e 100644
--- a/src/MAX_PROC_NR
+++ b/src/MAX_PROC_NR
@@ -1 +1 @@
-309
+310
diff --git a/tests/guests/guest-aux/make-debian-img.sh b/tests/guests/guest-aux/make-debian-img.sh
index 9449d0f..f0c1597 100755
--- a/tests/guests/guest-aux/make-debian-img.sh
+++ b/tests/guests/guest-aux/make-debian-img.sh
@@ -49,7 +49,7 @@ lvcreate home debian 32
# Phony /boot filesystem.
mkfs-opts ext2 /dev/sda1 blocksize:4096
-set-e2label /dev/sda1 BOOT
+set-label /dev/sda1 BOOT
set-e2uuid /dev/sda1 01234567-0123-0123-0123-012345678901
# Phony root and other filesystems.
diff --git a/tests/guests/guest-aux/make-fedora-img.pl b/tests/guests/guest-aux/make-fedora-img.pl
index 90010ef..fbc189d 100755
--- a/tests/guests/guest-aux/make-fedora-img.pl
+++ b/tests/guests/guest-aux/make-fedora-img.pl
@@ -126,12 +126,12 @@ $g->lvcreate('LV3', 'VG', 64);
# Phony /boot filesystem
$g->mkfs_opts('ext2', $bootdev, blocksize => 4096);
-$g->set_e2label($bootdev, 'BOOT');
+$g->set_label($bootdev, 'BOOT');
$g->set_e2uuid($bootdev, '01234567-0123-0123-0123-012345678901');
# Phony root filesystem.
$g->mkfs_opts('ext2', '/dev/VG/Root', blocksize => 4096);
-$g->set_e2label('/dev/VG/Root', 'ROOT');
+$g->set_label('/dev/VG/Root', 'ROOT');
$g->set_e2uuid('/dev/VG/Root', '01234567-0123-0123-0123-012345678902');
# Enough to fool inspection API.
diff --git a/tests/guests/guest-aux/make-ubuntu-img.sh b/tests/guests/guest-aux/make-ubuntu-img.sh
index c2831aa..a2b4d17 100755
--- a/tests/guests/guest-aux/make-ubuntu-img.sh
+++ b/tests/guests/guest-aux/make-ubuntu-img.sh
@@ -47,7 +47,7 @@ part-add /dev/sda p 524288 -64
# Phony /boot filesystem.
mkfs-opts ext2 /dev/sda1 blocksize:4096
-set-e2label /dev/sda1 BOOT
+set-label /dev/sda1 BOOT
set-e2uuid /dev/sda1 01234567-0123-0123-0123-012345678901
# Phony root filesystem (Ubuntu doesn't use LVM by default).
--
1.7.9.1
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