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apply changes properly when using multiple lowerdirs #142

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ezrizhu opened this issue Jan 13, 2024 · 0 comments
Open

apply changes properly when using multiple lowerdirs #142

ezrizhu opened this issue Jan 13, 2024 · 0 comments
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enhancement New feature or request

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ezrizhu commented Jan 13, 2024 •
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Talking with @angelhof about this, we realized there's a tricky interaction with process_changes when you have multiple lowerdirs: you have to replay the merge to do the comparison.
The correct solution is to mergerfs mount the layers of lowerdir and compare against that merged lowerdir (rather than the $local_file which just absolutizes to the real system root).
But until we have a use case where someone would want to use summaries and multiple lowerdirs (hs doesn't want the summaries), we should punt on this and give a warning that -L implies -n.

Originally posted by @mgree in #122 (comment)
@ezrizhu ezrizhu added the enhancement New feature or request label Jan 13, 2024
ezrizhu added a commit that referenced this issue Jan 13, 2024
@gliargovas @ezrizhu
Implement Multi-Lower-Layer Overlay Support through Merging (#122)
0647f69 
* feat: add -L flag to support one or more lower directories

* docs: shell completion, manpage, and readme update

* test: add test to test merging multiple lowerdirs, and also invoking -L multiple times

Note that currently -L implies -n (will not commit changes), support for that is being tracked in  #142

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Co-authored-by: gliargovas <gliarovas@aueb.gr>
Co-authored-by: Ezri Zhu <me@ezrizhu.com>
Reviewed-by: Michael Greenberg <michael.greenberg@stevens.edu>
Reviewed-by: Konstantinos Kallas <konstantinos.kallas@hotmail.com>
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@ezrizhu