84 lines
1.9 KiB
Plaintext
84 lines
1.9 KiB
Plaintext
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#! /usr/bin/env bash
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set -e
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url=$1
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rev=$2
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expHash=$3
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hashType="${NIX_HASH_ALGO:-sha256}"
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hashFormat=${hashFormat:-"--base32"}
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rev="${rev:-tip}"
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LOG() {
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echo "$@" >&2
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}
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die() {
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LOG "$@"
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exit 1
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}
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if [[ -z "$url" || "$url" == "--help" ]]; then
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die "Usage: nix-prefetch-hg URL [rev [EXPECTED-HASH]]"
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fi
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if [[ "${fetchSubrepos:-0}" == 1 ]]; then
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subrepoClause=S
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else
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subrepoClause=
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fi
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# If the hash was given, a file with that hash may already be in the
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# store.
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if [[ -n "$expHash" ]]; then
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finalPath=$(nix-store --print-fixed-path --recursive "$hashType" "$expHash" hg-archive)
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if ! nix-store --check-validity "$finalPath" 2> /dev/null; then
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finalPath=
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fi
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hash="$expHash"
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fi
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# If we don't know the hash or a path with that hash doesn't exist,
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# download the file and add it to the store.
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if [[ -z "$finalPath" ]]; then
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tmpPath="$(mktemp -d "${TMPDIR:-/tmp}/hg-checkout-tmp-XXXXXXXX")"
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cleanup() { x=$?; rm -rf "$tmpPath"; exit $x; }; trap cleanup EXIT
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tmpArchive="$tmpPath/hg-archive"
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# Perform the checkout.
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if [[ "$url" != /* ]]; then
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tmpClone="$tmpPath/hg-clone"
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hg clone -q -y -U "$url" "$tmpClone" >&2
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else
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tmpClone=$url
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fi
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hg archive -q$subrepoClause -y -r "$rev" --cwd "$tmpClone" "$tmpArchive"
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rm -f "$tmpArchive/.hg_archival.txt"
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LOG "hg revision is $(cd "$tmpClone"; hg id -r "$rev" -i)"
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# Compute the hash.
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hash=$(nix-hash --type "$hashType" "$hashFormat" "$tmpArchive")
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if [[ -z "$QUIET" ]]; then LOG "hash is $hash"; fi
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# Add the downloaded file to the Nix store.
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finalPath=$(nix-store --add-fixed --recursive "$hashType" "$tmpArchive")
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if [[ -n "$expHash" && "$expHash" != "$hash" ]]; then
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die "ERROR: hash mismatch for URL \`$url'"
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fi
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fi
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if [[ -z "$QUIET" ]]; then LOG "path is $finalPath"; fi
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echo "$hash"
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if [[ -n "$PRINT_PATH" ]]; then
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echo "$finalPath"
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fi
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