Red Hat Bugzilla – Bug 996507
Update to 3.6-1 breaks backward compatibility
Last modified: 2015-01-12 14:43:18 EST
Description of problem:
After updating deltarpm to 3.6.1 previously created gzip deltarpms can no longer be applied.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Install deltarpm 3.6
1. Build 2 gzip rpm packages.
2. Build deltarpm for them
3. Run applydeltarpm to verify.
4. Update deltarpm to 3.6.1
5. Run applydeltarpm again
Successful creation of deltarpm
There is no corresponding 3.6.1 update for rhel, so gzip deltarpms created there cannot be applied on Fedora.
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Sorry for the delay in replying. Just to be clear, we do not support applying deltarpms created with a different version of the compression library.
Deltarpm didn't change any code in its gzip using in the 3.6 update. The problem is that gzip doesn't make any guarantees about byte-for-byte identical files which is what deltarpm requires. When the gzip library changes, there is a non-zero chance that old deltarpms will no longer work, and there's not much we can do about that.
Thanks for taking the time to follow up on the EOL bugs.
I filed this originally because I suspected a change in deltarpm itself (probably https://gitorious.org/deltarpm/deltarpm/commit/e8f82b5d9014085d3cd63a5dc1332061e106b3c1) was the cause. Too late to do anything about it now anyway.