nixpkgs/pkgs/build-support/fetchdarcs/builder.sh

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source $stdenv/setup
tagtext=""
tagflags=""
if test -n "$rev"; then
tagtext="(tag $rev) "
tagflags="--tag=$rev"
elif test -n "$context"; then
tagtext="(context) "
tagflags="--context=$context"
fi
header "getting $url $partial ${tagtext} into $out"
darcs get --lazy $tagflags "$url" "$out"
# remove metadata, because it can change
rm -rf "$out/_darcs"
stopNest