73 lines
1.7 KiB
Bash
Executable file
73 lines
1.7 KiB
Bash
Executable file
#! /bin/sh -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
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if test -z "$hashType"; then
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hashType=sha256
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fi
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if test -z "$url"; then
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echo "syntax: nix-prefetch-git URL [REVISION [EXPECTED-HASH]]" >&2
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exit 1
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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 test -n "$expHash"; then
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finalPath=$(nix-store --print-fixed-path --recursive "$hashType" "$expHash" git-export)
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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 test -z "$finalPath"; then
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tmpPath=/tmp/git-checkout-tmp-$$
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tmpFile=$tmpPath/git-export
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mkdir $tmpPath
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trap "rm -rf $tmpPath" EXIT
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# Perform the checkout.
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git clone "$url" $tmpFile 1>&2
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if test -n "$rev"; then
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cd $tmpFile
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echo $tmpFile >&2
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git checkout $rev 1>&2
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fi
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# Allow doing additional processing before .git removal
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eval "$NIX_PREFETCH_GIT_CHECKOUT_HOOK"
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if test "$NIX_PREFETCH_GIT_LEAVE_DOT_GIT" != 1
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then
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echo "removing \`.git'..." >&2
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rm -rf .git
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fi
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# Compute the hash.
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hash=$(nix-hash --type $hashType $hashFormat $tmpFile)
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if ! test -n "$QUIET"; then echo "hash is $hash" >&2; fi
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# Add the downloaded file to the Nix store.
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finalPath=$(nix-store --add-fixed --recursive "$hashType" $tmpFile)
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if test -n "$expHash" -a "$expHash" != "$hash"; then
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echo "hash mismatch for URL \`$url'"
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exit 1
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fi
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fi
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if ! test -n "$QUIET"; then echo "path is $finalPath" >&2; fi
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echo $hash
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if test -n "$PRINT_PATH"; then
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echo $finalPath
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fi
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