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Re: [virt-tools-list] [PATCH] virt-install: avoid disk name collisions



Hi,


The issue looks same as rhbz#857424:

  https://bugzilla.redhat.com/show_bug.cgi?id=857424

My patch utilizes itertools.count and should avoid collisions also,
I guess.

- satoru

2012/10/4 Guido Günther <agx sigxcpu org>:
> When specifying multiple disks in pool without giving a name:
>
> virt-install \
>   --disk=pool=test,bus=virtio,size=3.0,sparse=false
>   --disk=pool=test,bus=virtio,size=3.0,sparse=false
>   ...
>
> virt-install creates the names before hand which leads to name
> collisions later on. Avoid this by filling in a collision list
> with the image basenames.
>
> This is overly cautions but better than running into a name collision
> during the vm install.
> ---
>  virt-install    |    4 +++-
>  virtinst/cli.py |   10 ++++++----
>  2 files changed, 9 insertions(+), 5 deletions(-)
>
> diff --git a/virt-install b/virt-install
> index cb42d56..12e65db 100755
> --- a/virt-install
> +++ b/virt-install
> @@ -134,7 +134,9 @@ def get_disk(diskopts, size, sparse, guest, is_file_path):
>          if is_file_path:
>              path = diskopts
>          else:
> -            dev, size = cli.parse_disk(guest, diskopts)
> +            collidelist = [os.path.basename(disk.path) for disk in guest.disks]
> +            dev, size = cli.parse_disk(guest, diskopts,
> +                                       collidelist=collidelist)
>              path = dev.path
>              sparse = dev.sparse
>
> diff --git a/virtinst/cli.py b/virtinst/cli.py
> index c5b9b17..feb01ec 100644
> --- a/virtinst/cli.py
> +++ b/virtinst/cli.py
> @@ -1476,7 +1476,7 @@ def parse_security(guest, security):
>  # --disk parsing #
>  ##################
>
> -def _parse_disk_source(guest, path, pool, vol, size, fmt, sparse):
> +def _parse_disk_source(guest, path, pool, vol, size, fmt, sparse, collidelist=None):
>      abspath = None
>      volinst = None
>      volobj = None
> @@ -1500,7 +1500,8 @@ def _parse_disk_source(guest, path, pool, vol, size, fmt, sparse):
>          vname = virtinst.Storage.StorageVolume.find_free_name(conn=guest.conn,
>                                                                pool_name=pool,
>                                                                name=guest.name,
> -                                                              suffix=".img")
> +                                                              suffix=".img",
> +                                                              collidelist=collidelist)
>          volinst = vc(pool_name=pool, name=vname, conn=guest.conn,
>                       allocation=0, capacity=(size and
>                                               size * 1024 * 1024 * 1024))
> @@ -1528,7 +1529,7 @@ def _parse_disk_source(guest, path, pool, vol, size, fmt, sparse):
>
>      return abspath, volinst, volobj
>
> -def parse_disk(guest, optstr, dev=None):
> +def parse_disk(guest, optstr, dev=None, collidelist=None):
>      """
>      helper to properly parse --disk options
>      """
> @@ -1594,7 +1595,8 @@ def parse_disk(guest, optstr, dev=None):
>      device = opt_get("device")
>
>      abspath, volinst, volobj = _parse_disk_source(guest, path, pool, vol,
> -                                                  size, fmt, sparse)
> +                                                  size, fmt, sparse,
> +                                                  collidelist)
>
>      if not dev:
>          # Build a stub device that should always validate cleanly
> --
> 1.7.10.4
>
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