November 2011 - Libguestfs - libguestfs List Archives

[PATCH v2] Add mdadm-create, list-md-devices APIs.
by Richard W.M. Jones 16 Nov '11

16 Nov '11

This adds the mdadm-create API for creating RAID devices, and includes various fixes for the other two patches. Rich.

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virt-df: ext2/3/4 statvfs(2) output changed between two recent Linux kernels (3.2.0)
by Richard W.M. Jones 13 Nov '11

13 Nov '11

[Jim, as coreutils developer, this might interest you] In libguestfs we run some quite detailed checks of the output of the statvfs system call for our tool "virt-df". I noticed that the output of virt-df changed slightly. Narrowing it down, the difference only happens between: Fedora kernel 3.2.0-0.rc0.git4.1.fc17 (3rd Nov) Fedora kernel 3.2.0-0.rc1.git2.1.fc17 (11th Nov) With 3.2.0-0.rc0.git4.1.fc17, and all earlier versions, the output of statvfs(2) on a freshly created 20M ext2 filesystem is: bsize: 1024 frsize: 1024 blocks: 19827 <-- NB bfree: 19655 bavail: 18631 files: 5136 ffree: 5125 favail: 5125 fsid: 1411286354856931562 flag: 4096 namemax: 255 With 3.2.0-0.rc1.git2.1.fc17, it changed to: bsize: 1024 frsize: 1024 blocks: 19939 <-- NB bfree: 19655 bavail: 18631 files: 5136 ffree: 5125 favail: 5125 fsid: -9088586685126948527 flag: 4096 namemax: 255 I am able to demonstrate the difference by keeping every other package identical, and just booting the two different kernels. As far as I know, everything else including e2fsprogs is completely identical. Reproducer: export FEBOOTSTRAP_KERNEL=/boot/vmlinuz-<version> guestfish sparse /tmp/test.img 20M : run : \ mkfs ext2 /dev/sda : mount /dev/sda / : statvfs / I tracked this down to the way the filesystem overhead is calculated. It changed slightly in the commit below. The description seems to be wrong; it seems to affect any filesystem going through the ext4 driver (this driver is used for ext2 & ext3 in recent Fedora), and doesn't appear to have anything to do with 'bigalloc'. commit f975d6bcc7a698a10cc755115e27d3612dcfe322 Author: Theodore Ts'o <tytso(a)mit.edu> Date: Fri Sep 9 19:00:51 2011 -0400 ext4: teach ext4_statfs() to deal with clusters if bigalloc is enabled Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones New in Fedora 11: Fedora Windows cross-compiler. Compile Windows programs, test, and build Windows installers. Over 70 libraries supprt'd http://fedoraproject.org/wiki/MinGW http://www.annexia.org/fedora_mingw

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[PATCH] kvm-tool: don't add the -Wunused-result flag
by Wanlong Gao 13 Nov '11

13 Nov '11

The -Wunused-result is the default option of gcc, so no need to add it to the FLAGS. And the previous version of gcc can't support this flag, it may cause a compile error. Signed-off-by: Wanlong Gao <gaowanlong(a)cn.fujitsu.com> --- tools/kvm/Makefile | 1 - 1 files changed, 0 insertions(+), 1 deletions(-) diff --git a/tools/kvm/Makefile b/tools/kvm/Makefile index f4741f2..bb5f6b0 100644 --- a/tools/kvm/Makefile +++ b/tools/kvm/Makefile @@ -176,7 +176,6 @@ WARNINGS += -Wstrict-prototypes WARNINGS += -Wundef WARNINGS += -Wvolatile-register-var WARNINGS += -Wwrite-strings -WARNINGS += -Wunused-result CFLAGS += $(WARNINGS) -- 1.7.8.rc1

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[PATCH v2] Add tune2fs command.
by Richard W.M. Jones 11 Nov '11

11 Nov '11

The changes since the previous patch: - safe ADD_ARG macro for adding arguments to a fixed size stack array - support for testing functions that return RHashtable, ie. tune2fs-l. - add tests that set (tune2fs) and get (tune2fs-l) various parameters. - only one 'intervalbetweenchecks' parameter (in seconds) Rich.

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[PATCH 1/2] New API: list_md_devices
by Matthew Booth 11 Nov '11

11 Nov '11

Return a list of Linux MD devices detected in the guest. This API complements list_devices, list_partitions, list_lvs and list_dm_devices. --- daemon/Makefile.am | 1 + daemon/daemon.h | 1 + daemon/guestfsd.c | 23 +++++++--- daemon/md.c | 75 +++++++++++++++++++++++++++++++++++ generator/generator_actions.ml | 10 +++++ po/POTFILES.in | 1 + regressions/Makefile.am | 1 + regressions/test-list-md-devices.sh | 59 +++++++++++++++++++++++++++ src/MAX_PROC_NR | 2 +- 9 files changed, 165 insertions(+), 8 deletions(-) create mode 100644 daemon/md.c create mode 100755 regressions/test-list-md-devices.sh

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[PATCH] Add tune2fs support to libguestfs.
by Richard W.M. Jones 10 Nov '11

10 Nov '11

At the moment OpenStack uses kpartx and nbd to resize filesystems and inject files to guests. I sincerely hope they don't allow untrusted users to upload guest images / AMIs :-( To fix this I'm looking into adding libguestfs support as an optional backend in OpenStack. The only missing feature in libguestfs is the ability to call tune2fs on a filesystem. This patch series adds tune2fs support. This also reveals a few bugs in the generator when you start to have calls with lots of required and optional parameters. Rich.

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libguestfs 1.14 update for Fedora 16
by Richard W.M. Jones 09 Nov '11

09 Nov '11

I would like to put libguestfs 1.14 (the next stable branch) into Fedora 16. There should be no changes required in other packages at all, since libguestfs is API and ABI compatible for all releases, forever. Nor should users know the difference (except new features). But it's software, and we don't have a formal proof, so there could be bugs ... The release notes here cover the major differences in 1.14 over 1.12: http://libguestfs.org/RELEASE-NOTES.txt Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones New in Fedora 11: Fedora Windows cross-compiler. Compile Windows programs, test, and build Windows installers. Over 70 libraries supprt'd http://fedoraproject.org/wiki/MinGW http://www.annexia.org/fedora_mingw

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[PATCH] New API: list-mddevices
by Matthew Booth 09 Nov '11

09 Nov '11

Return a list of Linux MD devices detected in the guest. --- appliance/packagelist.in | 2 + daemon/Makefile.am | 4 +- daemon/daemon.h | 1 + daemon/guestfsd.c | 23 ++++++--- daemon/md.c | 95 ++++++++++++++++++++++++++++++++++++ generator/generator_actions.ml | 16 ++++++ regressions/test-list-mddevices.sh | 43 ++++++++++++++++ src/MAX_PROC_NR | 2 +- 8 files changed, 177 insertions(+), 9 deletions(-) create mode 100644 daemon/md.c create mode 100755 regressions/test-list-mddevices.sh

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[PATCH] NFC: Update FSF address everywhere it's used
by Matthew Booth 08 Nov '11

08 Nov '11

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Re: [Libguestfs] guestmount error
by Richard W.M. Jones 04 Nov '11

04 Nov '11

On Fri, Nov 04, 2011 at 08:57:27PM +0200, Evaggelos Balaskas wrote: > sorry for bothering you, but if you gimme some pointers > it would be great > > # file /vm/images/archlinux/archlinux.qcow2 > /vm/images/archlinux/archlinux.qcow2: QEMU QCOW Image (v2), 5368709120 bytes > > # ls -la /mnt/ > total 8 > drwxr-xr-x 2 root root 4096 Oct 26 15:31 . > drwxr-xr-x 24 root root 4096 Oct 14 13:27 .. > > > # guestmount -a /vm/images/archlinux/archlinux.qcow2 -i /mnt/ > > warning: Unable to get device geometry for /var/tmp/guestfs.jmCrFb/root > libguestfs: error: aug_init: do_aug_init: function not available What version of libguestfs and what host are you running it on? You could try a couple of things: (1) Use: virt-filesystems -a /vm/images/archlinux/archlinux.qcow2 --all --long -h to list out the filesystems in the image, then try mounting them manually, as in this example, note the -m options which you will need to adjust according to the output of virt-filesystems: guestmount -a /vm/images/archlinux/archlinux.qcow2 \ -m /dev/vg/lv:/ -m /dev/sda1:/boot \ /mnt (The error message indicates you are lacking Augeas, which we use to examine the disk image for the right mountpoints, so you'd have to do that by hand.) (2) Set the following envionment variables and run the original guestmount command again: export LIBGUESTFS_DEBUG=1 export LIBGUESTFS_TRACE=1 Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones libguestfs lets you edit virtual machines. Supports shell scripting, bindings from many languages. http://libguestfs.org

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