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prevent dropping required content of other file using same content

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When two files have the same content, and a required content expression
matches one but not the other, dropping the latter file will fail as it
would also remove the content of the required file.

This will slow down drop (w/o --auto), dropunused, mirror, and move, by one
keys db lookup per file. But I did include an optimisation to avoid a
double db lookup in the drop --auto / sync --content case. I suspect that
dropunused could also use PreferredContentChecked True, but haven't
entirely thought it through and it's rarely used with enough files for the
optimisation to matter.

Sponsored-by: Dartmouth College's Datalad project
This commit is contained in:
Joey Hess 2021-05-25 10:57:06 -04:00
parent 7029ef1c3d
commit cedc28a783
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9 changed files with 105 additions and 60 deletions
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Logs/PreferredContent.hs
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@ -46,8 +46,8 @@ import Logs.Remote
import Types.StandardGroups
import Limit
{- Checks if a file is preferred content for the specified repository
- (or the current repository if none is specified). -}
{- Checks if a file is preferred content (or required content) for the
- specified repository (or the current repository if none is specified). -}
isPreferredContent :: Maybe UUID -> AssumeNotPresent -> Maybe Key -> AssociatedFile -> Bool -> Annex Bool
isPreferredContent = checkMap preferredContentMap