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# This function downloads and unpacks a zip file. This is primarily
# useful for dynamically generated zip files, 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
, ... } @ args:
fetchurl (args // {
# Apply a suffix to the name. Otherwise, unpackPhase will get
# confused by the .zip extension.
nameSuffix = "-unpacked";
recursiveHash = true;
downloadToTemp = true;
postFetch =
''
export PATH=${unzip}/bin:$PATH
mkdir $out
cd $out
renamed="$TMPDIR/''${name%-unpacked}"
mv "$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"
'';
})
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