compress-man-pages: symlink compressed manpages deterministically #105818
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SuperSandro2000
approved these changes
Dec 3, 2020
For example graphviz has chained symlinked manpages: dot2gxl.1 is a symlink to gv2gxl.1 which is a symlink to gxl2gv.1 The second loop replaces each non-compressed symlink to a compressed symlink. The target is determined with 'readlink -f', which follows links recursively until the first name that is not a link (so either the 'target name' or the first 'dangling' symlink). This means that if the loop converted dot2gxl.1 before converting gv2gxl.1 it would add a symlink `dot2gxl.1.gz->gxl2gv.1.gz`. When it converted gv2gxl.1 first, it would then add a `dot2gxl.1.gz->gv2gxl.1.gz` symlink. Both are 'correct', but it's weird the result depends on the order in which 'find' returns the files. This PR makes the behaviour deterministic. fixes NixOS#104708
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prusnak
approved these changes
Dec 7, 2020
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This pull request has been mentioned on NixOS Discourse. There might be relevant details there: |
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@FRidh just wanted to inform you about this if you see some random errors on staging with man pages. |
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For example graphviz has chained symlinked manpages: dot2gxl.1 is
a symlink to gv2gxl.1 which is a symlink to gxl2gv.1
The second loop replaces each non-compressed symlink to a compressed
symlink. The target is determined with 'readlink -f', which follows
links recursively until the first name that is not a link (so either
the 'target name' or the first 'dangling' symlink).
This means that if the loop converted dot2gxl.1 before converting
gv2gxl.1 it would add a symlink
dot2gxl.1.gz->gxl2gv.1.gz. Whenit converted gv2gxl.1 first, it would then add a
dot2gxl.1.gz->gv2gxl.1.gzsymlink.Both are 'correct', but it's weird the result depends on the order
in which 'find' returns the files. This PR makes the behaviour
deterministic.
fixes #104708
Motivation for this change
Things done
sandboxinnix.confon non-NixOS linux)nix-shell -p nixpkgs-review --run "nixpkgs-review wip"./result/bin/)nix path-info -Sbefore and after)