April 2012 - Libguestfs - libguestfs List Archives

Re: [Libguestfs] Suggestions on building VM disks from scratch
by Richard W.M. Jones 06 Apr '12

06 Apr '12

> Then I created my blank 'disk' file and tried to > run virt-rescue on it. It crashed out with an > error from febootstrap. First of all, debug this properly: (1) What is the full error message? (2) What is the complete, unedited output of 'libguestfs-test-tool'? (3) What version of libguestfs & febootstrap are using and where did you get them from? You can post the details on our mailing list libguestfs(a)redhat.com (no need to subscribe if you don't want to). > After finding nothing terribly > useful or current on this in searching, I tried > guestfish instead. After some fiddling I got it > to attach my blank disk. However I cannot find a > reasonable way to partition it with the part-add which > seems to want me to count sectors. All I want is > a 9G linux and a 2G swap. Assuming the filesystem was in /tmp/root.tar.gz, the following code will do this: guestfish <<EOF sparse /tmp/test.img 11G run part-init /dev/sda mbr # 9GB sda1 part-add /dev/sda p 64 $(( 9*1024*1024*2 )) # remainder in sda2 part-add /dev/sda p $(( 9*1024*1024*2 + 1 )) -64 mkfs ext4 /dev/sda1 mkswap /dev/sda2 mount /dev/sda1 / tgz-in /tmp/root.tar.gz / EOF Example: $ sh test.sh $ virt-df -a test.img -h Filesystem Size Used Available Use% test.img:/dev/sda1 9.0G 276M 8.3G 4% $ ll -h test.img -rw-rw-r--. 1 rjones rjones 11G Apr 4 09:39 test.img Whether this would actually boot is another question: you may also need to add some grub commands to set up the bootloader, *or* (better and easier IMHO) set up libvirt so that it boots from an external kernel + initrd. > It also lacks access to rsync. It's not the first time that someone has asked for rsync, and it wouldn't be too hard to add. However note that rsync really gives you no benefit when you're creating a filesystem from scratch, because there's no original to rsync against. If you are updating a filesystem image then rsync makes sense. 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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[PATCH] fuse: Add missing #include to guestmount.c
by Matthew Booth 04 Apr '12

04 Apr '12

Fix compilation failure on F17 --- fuse/guestmount.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fuse/guestmount.c b/fuse/guestmount.c index 7c5e0af..379346f 100644 --- a/fuse/guestmount.c +++ b/fuse/guestmount.c @@ -28,6 +28,7 @@ #include <unistd.h> #include <getopt.h> #include <signal.h> +#include <locale.h> /* We're still using some of FUSE to handle command line options. */ #include <fuse.h> -- 1.7.9.3

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febootstrap 3.x use cases.
by Carwyn Edwards 03 Apr '12

03 Apr '12

I'm confused! What use cases is the new febootstrap primarily intended for? I'm mainly trying to figure out if I'm trying to put a square peg into a round hole. What I'm looking into is using linux containers (LXC) either using libvirt or lxc-tools) to create jails for a web hosting type environment. I can see that in the long run btrfs has some nice features to help with this too. Is febootstrap really intended for this kind of use case? I can see two mechanisms that might work for what I'm trying to do: * Figure out how to create application containers around apache/whateverwebserver with a docroot and virtually no other filesystem. The down side to this is that it needs a lot of stuff added to the jail to make it work. * Use something like febootstrap or btrfs to create minimal filesystem roots for each hosted environment. This seems simpler if a little overkill. I'll probably ask over at the lxc lists and take a look at OpenVZ too. I'm mainly interested in finding out more about the intended use of febootstrap here. Thanks, Carwyn

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[PATCH RFC] sysprep:add logging feature
by Wanlong Gao 03 Apr '12

03 Apr '12

Hi Rich, What I felt at using virt-sysprep is that all things are done in silent and there is no log what's done. Please consider to add logging feature what was done at virt-sysprep. For example, deleted /var/log/utmp deleted /etc/..... modified /etc/sysconfing/network... ... What do you think? Thanks, Wanlong Gao Signed-off-by: Wanlong Gao <gaowanlong(a)cn.fujitsu.com> --- sysprep/sysprep_operation_cron_spool.ml | 2 ++ sysprep/sysprep_operation_dhcp_client_state.ml | 2 ++ sysprep/sysprep_operation_dhcp_server_state.ml | 2 ++ sysprep/sysprep_operation_hostname.ml | 2 ++ 4 files changed, 8 insertions(+) diff --git a/sysprep/sysprep_operation_cron_spool.ml b/sysprep/sysprep_operation_cron_spool.ml index e67688b..cec18e0 100644 --- a/sysprep/sysprep_operation_cron_spool.ml +++ b/sysprep/sysprep_operation_cron_spool.ml @@ -16,12 +16,14 @@ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *) +open Printf open Sysprep_operation module G = Guestfs let cron_spool_perform g root = Array.iter g#rm_rf (g#glob_expand "/var/spool/cron/*"); + eprintf "Deleted /var/spool/cron/*\n"; [] let cron_spool_op = { diff --git a/sysprep/sysprep_operation_dhcp_client_state.ml b/sysprep/sysprep_operation_dhcp_client_state.ml index e3e87cb..18415c5 100644 --- a/sysprep/sysprep_operation_dhcp_client_state.ml +++ b/sysprep/sysprep_operation_dhcp_client_state.ml @@ -16,6 +16,7 @@ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *) +open Printf open Sysprep_operation module G = Guestfs @@ -27,6 +28,7 @@ let dhcp_client_state_perform g root = fun glob -> Array.iter g#rm_rf (g#glob_expand glob) ) [ "/var/lib/dhclient/*"; "/var/lib/dhcp/*" (* RHEL 3 *) ] ); + eprintf "Deleted /var/lib/dhclient/* /var/lib/dhcp/*\n"; [] let dhcp_client_state_op = { diff --git a/sysprep/sysprep_operation_dhcp_server_state.ml b/sysprep/sysprep_operation_dhcp_server_state.ml index c5251ce..87cb2ed 100644 --- a/sysprep/sysprep_operation_dhcp_server_state.ml +++ b/sysprep/sysprep_operation_dhcp_server_state.ml @@ -16,12 +16,14 @@ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *) +open Printf open Sysprep_operation module G = Guestfs let dhcp_server_state_perform g root = Array.iter g#rm_rf (g#glob_expand "/var/lib/dhcpd/*"); + eprintf "Deleted /var/lib/dhcpd/*\n"; [] let dhcp_server_state_op = { diff --git a/sysprep/sysprep_operation_hostname.ml b/sysprep/sysprep_operation_hostname.ml index 1472a1c..6caf8d7 100644 --- a/sysprep/sysprep_operation_hostname.ml +++ b/sysprep/sysprep_operation_hostname.ml @@ -42,10 +42,12 @@ let hostname_perform g root = String.concat "\n" lines ^ sprintf "\nHOSTNAME=%s\n" !hostname in g#write filename file; + eprintf "Modified HOSTNAME to %s\n" !hostname; [ `Created_files ] | "linux", ("debian"|"ubuntu") -> g#write "/etc/hostname" !hostname; + eprintf "Modified HOSTNAME to %s\n" !hostname; [ `Created_files ] | _ -> [] -- 1.7.10.rc3

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[PATCH] virt-v2v: Support for Converting VirtualBox Guests
by Marko Myllynen 03 Apr '12

03 Apr '12

Hi, attached is an updated [1] patch for virt-v2v to support converting VirtualBox guests with VirtualBox Guest Additions [2] installed. With the patch applied a VirtualBox RHEL 6 guest with Guest Additions can be converted with the steps documented in the manual page. I've tested this patch on a RHEL 6.2 host running VirtualBox 4.1.8 using a RHEL 6.2 guest, the guest works as expected on libvirt/KVM and all traces of Guest Additions except for few log files were removed. This version uses VirtualBox Guest Additions configuration file to locate the script to uninstall [3]. If it would be possible to skip some of the needed steps and support VirtualBox directly from the command line that'd be great - if so, please adjust the patch as needed. 1) https://www.redhat.com/archives/virt-tools-list/2012-February/msg00064.html 2) http://www.virtualbox.org/manual/ch04.html 3) http://www.virtualbox.org/manual/ch04.html#idp11370256 Cheers, -- Marko Myllynen

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[PATCH 0/2] Fix btrfs blocksize and bind mkfs.btrfs (RHBZ#807905).
by Richard W.M. Jones 02 Apr '12

02 Apr '12

https://bugzilla.redhat.com/show_bug.cgi?id=807905 Currently if you specify the blocksize parameter to mkfs-opts with a btrfs filesystem, then it fails, because mkfs.btrfs interprets the -b option as meaning filesystem size. The first patch fixes this by disallowing blocksize (it cannot be mapped meaningfully into btrfs parameters). The second patch adds the full /sbin/mkfs.btrfs utility to the API. We should eventually do the same for mke2fs. Rich.

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[PATCH (incomplete)] Rewrite virt-sysprep in OCaml.
by Richard W.M. Jones 01 Apr '12

01 Apr '12

This patch is incomplete but it illustrates the idea. virt-sysprep is rewritten as a modular tool in OCaml. Only the 'utmp' and 'hostname' operations are implemented at the moment. Rich.

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