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nix-prefetch-git: run single-threaded 'git repack'
Without this, the generated pack files are non-deterministic. I didn't notice this issue in my earlier testing, because my test repo had too few commits for the thread scheduling to take effect. (Test repo had about 10 commits.)
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@ -226,9 +226,10 @@ make_deterministic_repo(){
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fi
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done
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# Do a full repack, for determinism.
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# Repack does not add unreferenced objects to a pack file.
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# Do a full repack. Must run single-threaded, or else we loose determinism.
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git config pack.threads 1
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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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git gc --prune=all
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