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if [ -e "$NIX_ATTRS_SH_FILE" ]; then . "$NIX_ATTRS_SH_FILE"; elif [ -f .attrs.sh ]; then . .attrs.sh; fi
source $stdenv/setup
tagtext=""
tagflags=""
# Darcs hashes are sha1 (120 bits, 40-character hex)
if [[ "$rev" =~ [a-fA-F0-9]{40} ]]; then
tagtext="(hash $rev)"
tagflags="--to-hash=$rev"
elif test -n "$rev"; then
tagtext="(tag $rev)"
tagflags="--tag=$rev"
elif test -n "$context"; then
tagtext="(context)"
tagflags="--context=$context"
fi
echo "getting $url $partial ${tagtext} into $out"
darcs get --lazy $tagflags "$url" "$out"
# remove metadata, because it can change
rm -rf "$out/_darcs"
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