forked from mirrors/nixpkgs
46 lines
1.4 KiB
Plaintext
46 lines
1.4 KiB
Plaintext
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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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}
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