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pool: Extend migration module with -meta-only option
Motivation: A recent bug caused sticky bits to be lost in certain situations. A procedure to repair the damage involves using a migration job to eliminate duplicates. To make this work we have to be able to limit migration jobs to only transfer the meta data and skip any files that do not already have other copies. Modification: Add the -meta-only option to migration jobs. If set, a migration task will only run the steps involving upgrading existing replicas and skip files that would require transferring the file itself. Result: migration copy/cache/move accept the new -meta-only option. Backport is requested to allow sites with existing versions repair the damange from the above mentioned bug. Target: trunk Request: 2.14 Request: 2.13 Request: 2.12 Require-notes: yes Require-book: yes Acked-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de> Patch: https://rb.dcache.org/r/8875 (cherry picked from commit 857aea9) (cherry picked from commit 227337e)
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