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# This function downloads and unpacks an archive file, such as a zip
# or tar file. This is primarily useful for dynamically generated
# archives, such as GitHub's /archive URLs, where the unpacked content
# of the zip file doesn't change, but the zip file itself may
# (e.g. due to minor changes in the compression algorithm, or changes
# in timestamps).
{ lib, fetchurl, unzip }:
{ # Optionally move the contents of the unpacked tree up one level.
stripRoot ? true
, url
, ... } @ args:
lib.overrideDerivation (fetchurl ({
name = args.name or (baseNameOf url);
recursiveHash = true;
downloadToTemp = true;
postFetch =
''
export PATH=${unzip}/bin:$PATH
mkdir $out
cd $out
renamed="$TMPDIR/${baseNameOf url}"
mv "$downloadedFile" "$renamed"
unpackFile "$renamed"
''
# FIXME: handle zip files that contain a single regular file.
+ lib.optionalString stripRoot ''
shopt -s dotglob
if [ "$(ls -d $out/* | wc -l)" != 1 ]; then
echo "error: zip file must contain a single directory."
exit 1
fi
fn=$(cd "$out" && echo *)
mv $out/$fn/* "$out/"
rmdir "$out/$fn"
'';
} // args))
# Hackety-hack: we actually need unzip hooks, too
(x: {nativeBuildInputs = x.nativeBuildInputs++ [unzip];})
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