120 lines
3.4 KiB
Plaintext
120 lines
3.4 KiB
Plaintext
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#! /bin/sh -eu
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set -o pipefail
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src=$(realpath $1)
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out=$(realpath $2)
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echo "Fetching $src to $out"
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mkdir $out
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# Configure cargo to fetch from a local copy of the crates.io registry
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#
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# Unfortunately, `cargo fetch` will create an output directory named after a
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# hash of the registry index URL.
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#
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# This makes things difficult for us because we don't want our output to change
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# just because the path to the registry changed, otherwise we'd have to update
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# all deps' SHA256 hashes whenever we simply update the registry to a newer
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# commit.
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#
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# Also, since cargo doesn't seem to support relative URLs in the format
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# file://../path, we use a hack to make sure the registry index path/URL is
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# always the same: we'll create a symlink in the current working directory to
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# the real registry path, while pointing cargo to the following fixed absolute
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# path:
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#
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# file:///proc/self/cwd/symlink-name
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ln -s $rustRegistry $src/cargo-rust-registry
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# TODO: replace /proc/self/cwd hack with normal relative path. Probably
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# needs cargo fix.
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cat <<EOF > $out/config
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[registry]
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index = "file:///proc/self/cwd/cargo-rust-registry"
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EOF
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export CARGO_HOME=$out
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cd $src
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cargo fetch --verbose
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# TODO: check that Cargo.lock exists, and hasn't changed
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# TODO: this should be done by cargo itself
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# Make it deterministic
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# The registry index changes all the time, so it's not deterministic
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rm -rf $out/registry/index
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# Make git DBs deterministic
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# TODO: test with git submodules
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[[ ! -d $out/git/checkouts ]] || (cd $out/git/checkouts && for name in *; do
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cd "$out/git/checkouts/$name"
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revs=""
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for branch in *; do
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cd "$branch"
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rev="$(git rev-parse HEAD)"
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revs="$revs $rev"
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cd ..
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done
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(
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# The following code was adapted from nix-prefetch-git
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cd "$out/git/db/$name"
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export GIT_DIR=.
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# Remove all remote branches
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git branch -r | while read branch; do
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git branch -rD "$branch" >&2
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done
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# Remove tags that don't point to any HEAD
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git tag | while read tag; do
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rev="$(git rev-parse $tag)"
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if [[ $revs != *" $rev"* ]]; then
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git tag -d "$tag" >&2
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fi
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done
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# Remove branches that don't point to any HEAD
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branchrefs=()
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eval "$(git for-each-ref --shell --format='branchrefs+=(%(refname))' refs/heads/)"
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for branchref in "${branchrefs[@]}"; do
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echo "Examining $branchref"
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rev="$(git rev-parse "$branchref")"
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echo "Has rev $rev"
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echo "List of revs: $revs"
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if [[ $revs != *" $rev"* ]]; then
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echo "Deleting $branchref"
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git update-ref -d "$branchref" >&2
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fi
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done
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echo "$revs" | while read rev; do
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echo "git branch b_$rev $rev"
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git branch b_$rev $rev
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done
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# Remove files that have timestamps or otherwise have non-deterministic
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# properties.
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rm -rf logs/ hooks/ index FETCH_HEAD ORIG_HEAD refs/remotes/origin/HEAD config
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# Do a full repack. Must run single-threaded, or else we lose 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 config
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# Garbage collect unreferenced objects.
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git gc --prune=all
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)
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done)
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# Remove unneeded outputs
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[[ ! -d $out/registry/src ]] || rm -rf $out/registry/src
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[[ ! -d $out/git/checkouts ]] || rm -rf $out/git/checkouts
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