March 2013 - Libguestfs - Libguestfs List Archives

[PATCH 0/4] Small refactorings of the protocol layer.

by Richard W.M. Jones

As the start of work to add remote support, I'm taking a close look at the protocol layer in the library. These are some small cleanups. Rich.

11 years, 8 months

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guestfs-examples

by Khan Ferdous Wahid

Hi, I tried to run the guestfs-examples from http://libguestfs.org/guestfs-examples.3.html, but they gave the following warnings and errors- #warning: Unable to get device geometry for /var/tmp/guestfs.JVxEUn/root #libguestfs: error: guestfs_launch failed, see earlier error messages What I did from the beginning- I boot my debian linux (2.6.32-5-686) inside VirtualBox and then install following packages there- #apt-get install qemu libguestfs-dev libguestfs-tools Then I created an image and install debian using qemu (inside my linux in VirtualBox, i.e. host)- #qemu-img create -f qcow2 deb.img 4G #qemu -m 256 -hda deb.img -cdrom debian-6.0.7-i386-netinst.iso -boot d Then I ran the vm using qemu in one terminal (inside my linux in VirtualBox, i.e. host)- #qemu -m 256 -hda deb.img -boot d In another terminal, I did- #gcc -Wall inspect_vm.c -o prog -lguestfs (without any warnings) #./prog deb.img Then the above warnings and errors were generated. Also I shutdown the vm, and tried to inspect the offline VM image (./prog deb.img), but it gaves the error- #libguestfs: error: guestfs_launch failed, see earlier error messages I tried to run the "EXAMPLE: DISPLAY THE OPERATING SYSTEM ICON OF A GUEST", but it gaves the same error- #libguestfs: error: guestfs_launch failed, see earlier error messages What is the problem here? Thank you. Best regards, Wahid

11 years, 8 months

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Fwd: [Bug 916990] inspect_os: mount_ro: /dev/sda on / (options: 'ro'): mount: /dev/sda is already mounted or /sysroot busy

by Richard W.M. Jones

More evidence this is a real bug affecting users. I still have no idea why this bug happens. Rich. ----- Forwarded message from bugzilla(a)redhat.com ----- Date: Tue, 05 Mar 2013 20:29:23 +0000 Subject: [Bug 916990] inspect_os: mount_ro: /dev/sda on / (options: 'ro'): mount: /dev/sda is already mounted or /sysroot busy Product: Virtualization Tools https://bugzilla.redhat.com/show_bug.cgi?id=916990 Joe Ryner changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jryner(a)cait.org --- Comment #1 from Joe Ryner <jryner(a)cait.org> --- I had the same error and am providing the trace below. Fedora 18 latest update as of 3/5/13 stone-v4: 100% [=====================================================]D 0h54m39s libguestfs: trace: set_attach_method "appliance" libguestfs: trace: set_attach_method = 0 libguestfs: trace: add_drive "/var/lib/libvirt/images/stone-v4" "format:raw" "iface:ide" "name:xvda" libguestfs: trace: add_drive = 0 libguestfs: trace: add_drive "/tmp/PKKXoKFY2u" "readonly:true" "format:raw" "iface:ide" libguestfs: trace: add_drive = 0 libguestfs: trace: set_network true libguestfs: trace: set_network = 0 libguestfs: trace: launch libguestfs: trace: get_tmpdir libguestfs: trace: get_tmpdir = "/tmp" libguestfs: trace: get_cachedir libguestfs: trace: get_cachedir = "/var/tmp" libguestfs: trace: launch = 0 libguestfs: trace: list_devices libguestfs: trace: list_devices = ["/dev/sda", "/dev/sdb"] libguestfs: trace: inspect_os libguestfs: trace: umount_all libguestfs: trace: umount_all = 0 libguestfs: trace: list_devices libguestfs: trace: list_devices = ["/dev/sda", "/dev/sdb"] libguestfs: trace: vfs_type "/dev/sda" libguestfs: trace: vfs_type = "" libguestfs: trace: isoinfo_device "/dev/sda" libguestfs: trace: isoinfo_device = NULL (error) libguestfs: trace: mount_ro "/dev/sda" "/" libguestfs: trace: mount_ro = -1 (error) libguestfs: trace: vfs_type "/dev/sdb" libguestfs: trace: vfs_type = "iso9660" libguestfs: trace: isoinfo_device "/dev/sdb" libguestfs: trace: isoinfo_device = <struct guestfs_isoinfo *> libguestfs: trace: inspect_os = NULL (error) libguestfs: trace: close libguestfs: trace: internal_autosync libguestfs: trace: internal_autosync = 0 inspect_os: mount_ro: /dev/sda on / (options: 'ro'): mount: /dev/sda is already mounted or /sysroot busy at /usr/share/perl5/vendor_perl/Sys/VirtConvert/GuestfsHandle.pm line 194. at /usr/bin/virt-v2v line 672. -- You are receiving this mail because: You reported the bug. ----- End forwarded message ----- -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming blog: http://rwmj.wordpress.com Fedora now supports 80 OCaml packages (the OPEN alternative to F#)

11 years, 8 months

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Some fixes for building the Debian package for 1.20.2

by Hilko Bengen

I needed to add a few patches to be able to build libguestfs 1.20.2 out of tree. Mostly srcdir/builddir issues -- I think that I had posted something for building the daemon before. As mentioned on IRC, I found that compiling (Ruby bindings) caused config.h file shipped with the Ruby headers to be included rather than ${builddir}/config.h. This can be fixed because the relevant checks can be performed in the extconf.rb script as well. Cheers, -Hilko

11 years, 8 months

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[PATCH v2] fuse: Add guestunmount program to handle unmounting (RHBZ#916780)

by Richard W.M. Jones

Since the first patch: - The program is now called 'guestunmount'. - I tested the --fd option and it appears to work. - You can now control retries / quiet. - Revised man pages. - Includes tests. I'm just running through the automated tests now. Rich.

11 years, 8 months

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Fwd: Failure of automatic update of source file: virt-v2v: virt-v2v.pot

by Richard W.M. Jones

----- Forwarded message from Transifex <admin(a)transifex.com> ----- Date: Tue, 05 Mar 2013 08:36:55 -0000 Subject: Failure of automatic update of source file: virt-v2v: virt-v2v.pot Hello rjones, this is Transifex at https://www.transifex.com. We have not been able to update the source file of the resource 'virt-v2v.pot' of the project 'virt-v2v' from the URL http://git.fedorahosted.org/git/?p=virt-v2v.git;a=blob_plain;f=po/virt-v2.... The exact error we encountered was: Syntax error in po file (line 2) ----- End forwarded message ----- -- 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

11 years, 8 months

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[PATCH] fuse: Add guestmount-cleanup program to handle unmounting (RHBZ#916780).

by Richard W.M. Jones

* PATCH FOR DISCUSSION ONLY - NOT TO BE APPLIED * Colin suggested something which seems eminently sensible: https://bugzilla.redhat.com/show_bug.cgi?id=916780 I've been through a couple of rounds of trying to implement this. I started with adding the option as suggested to the guestmount program, but it tended to make the guestmount program more complex. More importantly, adding the option only to guestmount means that it cannot be used outside guestmount, specifically by programs that use the mount-local API[1] directly. (For various reasons 'guestfs_umount_local' isn't a usable API in most situations). My second implementation is the patch attached. It adds a new program called guestmount-cleanup which can be used two ways: guestmount-cleanup --fd=<FD> mountpoint where it will monitor the pipe file descriptor <FD>. (I should note that I've never actually tested this code path). Or: guestmount-cleanup mountpoint where it immediately unmounts the mountpoint. In both cases it deals with fusermount retries. The patch is still large and clunky and it doesn't make FUSE that much easier to cope with. I suspect the way to go from here is to reimplement fusermount itself. It would, for example, be much better if we could get some information from fusermount about why it failed. That seems like a good idea until I tell you that fusermount is a setuid program and needs those privs even when dealing with a regular non-root FUSE mount. So we pretty much have to use it, so I'll have to send patches for it. It may also be that we're going about this all wrong and we should use CLONE_NS (which also requires root -- currently) to stop these systemwide daemons from interfering. Rich. [1] http://libguestfs.org/guestfs.3.html#mount-local

11 years, 8 months

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Guestconv library and python worker process

by Crag Wolfe

Per conversation last week with Rich and Matt, while we want to have a Guestconv C API which is relatively easy to bind to across different languages, for the sake of expediency we want to the do the actual work in Python. The idea is that the C API will spawn a python process when guestconv_create is called and ultimately be responsible for terminating the process. Communication between the two process happens over pipe(2). From the Python perspective, we will simply listen on stdin for "commands" (there will be a command per API call: guestconv_add_drive, guestconv_root, and guestconv_convert) and write the results to stdout. Does that sound good to the list? Of course, we'll need to define what exactly what the stdin/stdout interface looks like, but that will be straightforward given the C API. Thanks, --Crag Ref: https://www.redhat.com/archives/libguestfs/2013-February/msg00107.html

11 years, 8 months

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virt-v2v F18 guest on F18 failure

by Ryan Barry

Run with LIBGUESTFS_ATTACH_METHOD=appliance Fails with: inspect_os: mount_ro: /dev/sda on / (options: 'ro'): mount: /dev/sda is already mounted or /sysroot busy at /usr/share/perl5/vendor_perl/Sys/VirtConvert/GuestfsHandle.pm line 194. virt-inspector works as expected libguestfs-test-tool.log: http://pastebin.ca/2317900 virt-v2v.log: http://iaindb.pastebin.ca/2317938 Any suggestions? -- while (!asleep) {sheep++;}

11 years, 9 months

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[PATCH v2 0/5] Fix SELinux security contexts so we can access shared disks (RHBZ#912499).

by Richard W.M. Jones

Link to version 1: https://www.redhat.com/archives/libguestfs/2013-February/thread.html#00122 Changes since version 1: - I've pushed two (of the three) code refactoring patches. The third one proved rather hard to move. - selinuxnorelabel option is no more. Instead there is a second internal API (internal_set_libvirt_selinux_norelabel_disks). - fixed bogus commit message - various other very minor fixes Rich.

11 years, 9 months

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Libguestfs March 2013