[Libguestfs] [FEBOOTSTRAP] Ensure atomic creation of a cached appliance
Matthew Booth
mbooth at redhat.com
Tue Oct 5 09:24:56 UTC 2010
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.
---
regressions/test-launch-race.pl | 60 ++++++++++++++++++++++
src/appliance.c | 105 ++++++++++++++++++++++++++++++++++-----
2 files changed, 152 insertions(+), 13 deletions(-)
create mode 100755 regressions/test-launch-race.pl
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