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gn: generate last_commit_position.h without git #46721

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merged 1 commit into from Sep 16, 2018
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YorikSar
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Motivation for this change

For Git to work properly, I used fetchgit with leaveDotGit. This seems
to be causing hash to change on different systems in different times.
I've replaced generation of last_commit_position.h in tools/gen.py with
just plain nix template. "gn --version" will loose a bit (just commit
hash, without commit height in front of it), but I hope noone relies on
it.

Things done
  • Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
  • Built on platform(s)
    • NixOS
    • macOS
    • other Linux distributions
  • Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
  • Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
  • Tested execution of all binary files (usually in ./result/bin/)
  • Determined the impact on package closure size (by running nix path-info -S before and after)
  • Fits CONTRIBUTING.md.

Related PRs: #46328 #46718
CC @volth @eadwu @7c6f434c @Mic92

For Git to work properly, I used fetchgit with leaveDotGit. This seems
to be causing hash to change on different systems in different times.
I've replaced generation of last_commit_position.h in tools/gen.py with
just plain nix template. "gn --version" will loose a bit (just commit
hash, without commit height in front of it), but I hope noone relies on
it.
@YorikSar
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We definitely should fix this in fetchgit too, but I still find it cleaner not having to drag whole repo as build source here.

@7c6f434c
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I agree that fixing leaveDotGit is useful, but I also agree that avoiding it can be useful even if it works.

@7c6f434c 7c6f434c merged commit 32632fb into NixOS:master Sep 16, 2018
@Mic92
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Mic92 commented Sep 16, 2018

I don't see how leaveDotGit could be made deterministic, when we update git. Every version could change the internal format.

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4 participants