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| author | Matthew Booth <mbooth@redhat.com> | 2010-10-28 15:19:14 +0100 |
|---|---|---|
| committer | Richard W.M. Jones <rjones@redhat.com> | 2010-10-28 16:47:06 +0100 |
| commit | f2460699ab7f972b1981d072164a04820c52b0c6 (patch) | |
| tree | e91d6c4db22202aa57177a0034a74be443d92d82 /daemon | |
| parent | 38af2eaceb4c8e9d675835bcd6e598ccb67daf0f (diff) | |
| download | libguestfs-f2460699ab7f972b1981d072164a04820c52b0c6.tar.gz libguestfs-f2460699ab7f972b1981d072164a04820c52b0c6.tar.xz libguestfs-f2460699ab7f972b1981d072164a04820c52b0c6.zip | |
Ensure atomic creation of a cached appliance
Cached appliances are discovered by their predictable path. Previously we were
creating a cached appliance directly in this predictable path. This had at least
2 undesirable effects:
* Interrupting appliance creation would leave a corrupt appliance
* 2 processes could simultaneously attempt to create the same appliance, causing
corruption.
This patch causes the cached appliance to be created in a temporary directory,
and then renamed to the predictable path. As rename is an atomic operation, this
makes the whole creation atomic.
This patch also changes the predictable path to have a prefix of 'guestfs.'.
This will make it simpler for system administrators to clean up old cached
appliances.
This patch resolves RHBZ#639405
Diffstat (limited to 'daemon')
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