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[[!meta title="Missing chunk error with 'obnam forget'"]]
Obnam had a bug in which "obnam forget" would remove a chunk before
removing references to the chunk. If the "obnam forget" was
interrupted, the repository would have references to chunks that had
already been removed. This would cause a later run of "obnam forget"
to try to remove a chunk that no longer exists, and that would cause a
crash.
The crashing was fixed in Obnam version 1.13. As of that version,
"obnam forget" will ignore that a chunk is missing if it's removing
that chunk anyway.
There remains a problem, unfixed as of Obnam 1.16, where the chunk
still exists in lookup indexes, and "obnam backup" may try to use the
chunk.
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