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Adam Miller

2011-Oct-08 08:01 UTC

[Libguestfs] guestmount issues with --live, but guestfish works just fine

Hello all,
    I am having an issue with guestmount in respect to live instances
and I was hoping someone might have an idea where I've gone wrong. The
following output is from my shell session, if there's any more
information needed please let me know and I'll happily provide it.

[root at longitude ~]# virt-filesystems -d F16-rawhide/dev/sda2
/dev/sda3
[root at longitude ~]# guestmount --live -d F16-rawhide -m /dev/sda3:/
/mnt/guestfs/
libguestfs: error: mount_options: /dev/vda3 on /: mount: /dev/vda3
already mounted or / busy
mount: according to mtab, /dev/vda3 is already mounted on /
libguestfs: error: part_to_dev: part_to_dev_stub: /dev/vda3: device not
found
libguestfs: error: check_for_daemon_cancellation_or_eof: read 0x34 from
daemon, expected 0xffffeeee

guestmount: '/dev/sda3' could not be mounted.  Did you mean one of
these?
        /dev/vda1 (unknown)
        /dev/vda2 (unknown)
        /dev/vda3 (unknown)
        /dev/vda4 (unknown)
libguestfs: error: check_for_daemon_cancellation_or_eof: read 0x0 from
daemon, expected 0xffffeeee

[root at longitude ~]# guestmount --live -d F16-rawhide -m /dev/vda3:/
/mnt/guestfs/
libguestfs: error: mount_options: mount_options_stub: /dev/vda3: device
not found
libguestfs: error: unexpected procedure number (74/7)
libguestfs: error: unexpected procedure number (7/282)
[root at longitude ~]# guestmount --live -d F16-rawhide -m /dev/vda3:/ -v
/mnt/guestfs/
libguestfs: [00000ms] connecting to
/var/lib/libvirt/qemu/F16-rawhide.libguestfs
libguestfs: recv_from_daemon: 40 bytes: 20 00 f5 f5 | 00 00 00 04 | 00
00 01 1a | 00 00 00 01 | 00 12 34 02 | ...
libguestfs: error: guestfs_launch failed, unexpected initial message
from guestfsd
libguestfs: closing guestfs handle 0x1191760 (state 1)
libguestfs: sending SIGTERM to process 0
[root at longitude ~]# guestmount --live -d F16-rawhide -m /dev/vda3:/ -v
-x /mnt/guestfs/
libguestfs: trace: set_recovery_proc true
libguestfs: trace: set_recovery_proc = 0
libguestfs: trace: add_domain "F16-rawhide" "live:true"
libguestfs: trace: set_attach_method
"unix:/var/lib/libvirt/qemu/F16-rawhide.libguestfs"
libguestfs: trace: set_attach_method = 0
libguestfs: trace: add_domain = 0
libguestfs: trace: launch
libguestfs: [00000ms] connecting to
/var/lib/libvirt/qemu/F16-rawhide.libguestfs
libguestfs: recv_from_daemon: received GUESTFS_LAUNCH_FLAG
libguestfs: [00000ms] connected
libguestfs: trace: launch = 0
libguestfs: trace: mount_options "" "/dev/vda3"
"/"
libguestfs: send_to_daemon: 72 bytes: 00 00 00 44 | 20 00 f5 f5 | 00 00
00 04 | 00 00 00 4a | 00 00 00 00 | ...
libguestfs: recv_from_daemon: 96 bytes: 20 00 f5 f5 | 00 00 00 04 | 00
00 00 4a | 00 00 00 01 | 00 12 34 00 | ...
libguestfs: trace: mount_options = -1 (error)
libguestfs: error: mount_options: mount_options_stub: /dev/vda3: device
not found
libguestfs: trace: list_filesystems
libguestfs: trace: list_devices
libguestfs: send_to_daemon: 44 bytes: 00 00 00 28 | 20 00 f5 f5 | 00 00
00 04 | 00 00 00 07 | 00 00 00 00 | ...
libguestfs: recv_from_daemon: 168 bytes: 20 00 f5 f5 | 00 00 00 04 | 00
00 00 4a | 00 00 00 01 | 00 12 34 00 | ...
libguestfs: error: unexpected procedure number (74/7)
libguestfs: trace: list_devices = NULL (error)
libguestfs: trace: list_filesystems = NULL (error)
libguestfs: closing guestfs handle 0x6e8760 (state 2)
libguestfs: trace: internal_autosync
libguestfs: send_to_daemon: 44 bytes: 00 00 00 28 | 20 00 f5 f5 | 00 00
00 04 | 00 00 01 1a | 00 00 00 00 | ...
libguestfs: recv_from_daemon: 56 bytes: 20 00 f5 f5 | 00 00 00 04 | 00
00 00 07 | 00 00 00 01 | 00 12 34 01 | ...
libguestfs: error: unexpected procedure number (7/282)
libguestfs: trace: internal_autosync = -1 (error)
libguestfs: trace: kill_subprocess
libguestfs: sending SIGTERM to process 0
libguestfs: trace: kill_subprocess = 0
[root at longitude ~]# guestfish --live -d F16-rawhide

Welcome to guestfish, the libguestfs filesystem interactive shell for
editing virtual machine filesystems.

Type: 'help' for help on commands
      'man' to read the manual
      'quit' to quit the shell
><fs> run
><fs> ls /bin
boot
dev
etc
home
lib
lib64
lost+found
media
mnt
opt
proc
root
run
sbin
srv
sys
tmp
usr
var><fs> 

Many thanks!
-AdamM

Richard W.M. Jones

2011-Oct-08 08:15 UTC

head link

[Libguestfs] guestmount issues with --live, but guestfish works just fine

On Sat, Oct 08, 2011 at 03:01:02AM -0500, Adam Miller
wrote:> Hello all,
>     I am having an issue with guestmount in respect to live instances
> and I was hoping someone might have an idea where I've gone wrong. The
> following output is from my shell session, if there's any more
> information needed please let me know and I'll happily provide it.
> 
> [root at longitude ~]# virt-filesystems -d F16-rawhide
> /dev/sda2
> /dev/sda3
> [root at longitude ~]# guestmount --live -d F16-rawhide -m /dev/sda3:/
> /mnt/guestfs/
> libguestfs: error: mount_options: /dev/vda3 on /: mount: /dev/vda3
> already mounted or / busy
> mount: according to mtab, /dev/vda3 is already mounted on /
> libguestfs: error: part_to_dev: part_to_dev_stub: /dev/vda3: device not
> found
> libguestfs: error: check_for_daemon_cancellation_or_eof: read 0x34 from
> daemon, expected 0xffffeeee
> 
> guestmount: '/dev/sda3' could not be mounted.  Did you mean one of
> these?
>         /dev/vda1 (unknown)
>         /dev/vda2 (unknown)
>         /dev/vda3 (unknown)
>         /dev/vda4 (unknown)
> libguestfs: error: check_for_daemon_cancellation_or_eof: read 0x0 from
> daemon, expected 0xffffeeee
Yeah, I can sort of see what's going on here.  I think it reflects the
fact that --live support is not very well integrated with guestmount
at the moment.  Because this is a live connection, filesystems are
already mounted (inside the running guest) so you don't need the -m
option at all.  Unfortunately a bug in guestmount prevents you from
not using the -m option:

  $ guestmount --live -d FedoraRawhidex64 /tmp/mnt
  guestmount: must have at least one -a/-d and at least one -m/-i option

So at the moment without fixing that bug, it's not possible.

I'd be careful with using live support right now.  There are a few
corner cases where it doesn't behave very well.  In particular there
are two API calls that try to edit /etc files (OK in the appliance,
not so great for live guests):

  $ git grep /etc daemon
  daemon/findfs.c:  unlink ("/etc/blkid/blkid.tab");
  daemon/lvm-filter.c:/* Rewrite the 'filter = [ ... ]' line in
/etc/lvm/lvm.conf.
  daemon/lvm-filter.c:  FILE *ifp = fopen ("/etc/lvm/lvm.conf",
"r");
  daemon/lvm-filter.c:    reply_with_perror ("open:
/etc/lvm/lvm.conf");
  daemon/lvm-filter.c:  FILE *ofp = fopen ("/etc/lvm/lvm.conf.new",
"w");
  daemon/lvm-filter.c:    reply_with_perror ("open:
/etc/lvm/lvm.conf.new");
  daemon/lvm-filter.c:      reply_with_error ("/etc/lvm/lvm.conf.new: write
failed
  daemon/lvm-filter.c:      unlink ("/etc/lvm/lvm.conf.new");
  daemon/lvm-filter.c:    reply_with_perror ("/etc/lvm/lvm.conf.new");
  daemon/lvm-filter.c:    unlink ("/etc/lvm/lvm.conf.new");
  daemon/lvm-filter.c:    reply_with_perror ("/etc/lvm/lvm.conf.new");
  daemon/lvm-filter.c:    unlink ("/etc/lvm/lvm.conf.new");
  daemon/lvm-filter.c:  if (rename ("/etc/lvm/lvm.conf.new",
"/etc/lvm/lvm.conf")
  daemon/lvm-filter.c:    reply_with_perror ("rename:
/etc/lvm/lvm.conf");
  daemon/lvm-filter.c:    unlink ("/etc/lvm/lvm.conf.new");
  daemon/lvm-filter.c:  unlink ("/etc/lvm/cache/.cache");
  daemon/mount.c:/* Again, use the external /bin/umount program, so that /etc/mt

You need to be cautious with live support and know what you're doing.
> [root at longitude ~]# guestmount --live -d F16-rawhide -m /dev/vda3:/
> /mnt/guestfs/
> libguestfs: error: mount_options: mount_options_stub: /dev/vda3: device
> not found
> libguestfs: error: unexpected procedure number (74/7)
> libguestfs: error: unexpected procedure number (7/282)
This error is because there is some sort of incompatibility in the
protocol between the two versions of libguestfs being used.  Again,
since live support is still being developed, we haven't (yet) made the
protocol stable and compatible between versions.

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

Richard W.M. Jones

2011-Oct-08 08:34 UTC

head link

[Libguestfs] guestmount issues with --live, but guestfish works just fine

-- 
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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