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#! /bin/sh -e
cvsRoot=$1
module=$2
tag=$3
expHash=$4
hashType=$NIX_HASH_ALGO
if test -z "$hashType"; then
hashType=sha256
fi
if test -z "$cvsRoot"; then
echo "syntax: nix-prefetch-cvs CVSROOT MODULE [TAG [HASH]]" >&2
exit 1
elif test -z "$module"; then
echo "syntax: nix-prefetch-cvs CVSROOT MODULE [TAG [HASH]]" >&2
exit 1
fi
mkTempDir() {
tmpPath="$(mktemp -d "${TMPDIR:-/tmp}/nix-prefetch-cvs-XXXXXXXX")"
trap removeTempDir EXIT SIGINT SIGQUIT
}
removeTempDir() {
if test -n "$tmpPath"; then
rm -rf "$tmpPath" || true
fi
}
# If the hash was given, a file with that hash may already be in the
# store.
if test -n "$expHash"; then
finalPath=$(nix-store --print-fixed-path --recursive "$hashType" "$expHash" cvs-export)
if ! nix-store --check-validity "$finalPath" 2> /dev/null; then
finalPath=
fi
hash=$expHash
fi
# If we don't know the hash or a path with that hash doesn't exist,
# download the file and add it to the store.
if test -z "$finalPath"; then
mkTempDir
tmpFile=$tmpPath/cvs-export
#mkdir $tmpPath
# Perform the checkout.
if test -z "$tag"; then
args=(-D "now")
elif test "$USE_DATE" = "1"; then
args=(-D "$tag")
else
args=(-r "$tag")
fi
(cd "$tmpPath" && cvs -f -z0 -d $cvsRoot export "${args[*]}" -d cvs-export $module >&2)
# Compute the hash.
hash=$(nix-hash --type $hashType $hashFormat $tmpFile)
if ! test -n "$QUIET"; then echo "hash is $hash" >&2; fi
# Add the downloaded file to the Nix store.
finalPath=$(nix-store --add-fixed --recursive "$hashType" $tmpFile)
if test -n "$expHash" -a "$expHash" != "$hash"; then
echo "hash mismatch for CVS root \`$cvsRoot'"
exit 1
fi
fi
if ! test -n "$QUIET"; then echo "path is $finalPath" >&2; fi
echo $hash
if test -n "$PRINT_PATH"; then
echo $finalPath
fi
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