commit ba83787f0dc74275fb5a6632f0c40fbbe72e64fb · pyrox.dev/nixpkgs

+45
pkgs/build-support/fetchgit/deterministic-git
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       #!/bin/sh

     

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       # some git commands print to stdout, which would contaminate our JSON output

     

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       clean_git(){

     

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           git "$@" >&2

     

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       }

     

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       # Remove all remote branches, remove tags not reachable from HEAD, do a full

     

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       # repack and then garbage collect unreferenced objects.

     

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       make_deterministic_repo(){

     

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           local repo="$1"

     

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           # run in sub-shell to not touch current working directory

     

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           (

     

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           cd "$repo"

     

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           # Remove files that contain timestamps or otherwise have non-deterministic

     

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           # properties.

     

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           rm -rf .git/logs/ .git/hooks/ .git/index .git/FETCH_HEAD .git/ORIG_HEAD \

     

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               .git/refs/remotes/origin/HEAD .git/config

     

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           # Remove all remote branches.

     

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           git branch -r | while read -r branch; do

     

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               clean_git branch -rD "$branch"

     

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           done

     

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           # Remove tags not reachable from HEAD. If we're exactly on a tag, don't

     

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           # delete it.

     

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           maybe_tag=$(git tag --points-at HEAD)

     

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           git tag --contains HEAD | while read -r tag; do

     

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               if [ "$tag" != "$maybe_tag" ]; then

     

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                   clean_git tag -d "$tag"

     

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               fi

     

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           done

     

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           # Do a full repack. Must run single-threaded, or else we lose determinism.

     

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           clean_git config pack.threads 1

     

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           clean_git repack -A -d -f

     

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           rm -f .git/config

     

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           # Garbage collect unreferenced objects.

     

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           # Note: --keep-largest-pack prevents non-deterministic ordering of packs

     

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           #   listed in .git/objects/info/packs by only using a single pack

     

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           clean_git gc --prune=all --keep-largest-pack

     

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           )

     

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       }