Tar translate duplicate files in the archive into hard links. These can cause
problems, as not every tool support them; for example dpkg doesn't.
* gnu/system/file-systems.scm (reduce-directories): New procedure.
(file-prefix?): Lift the restriction on file prefix. The procedure can be
useful for comparing relative file names. Adjust doc.
(file-name-depth): New procedure, extracted from ...
(btrfs-store-subvolume-file-name): ... here.
* guix/scripts/pack.scm (self-contained-tarball/builder): Use
reduce-directories.
* tests/file-systems.scm ("reduce-directories"): New test.
4f3bdc8f21