64 lines
2 KiB
Nix
64 lines
2 KiB
Nix
# This function downloads and unpacks an archive file, such as a zip
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# or tar file. This is primarily useful for dynamically generated
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# archives, such as GitHub's /archive URLs, where the unpacked content
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# of the zip file doesn't change, but the zip file itself may
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# (e.g. due to minor changes in the compression algorithm, or changes
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# in timestamps).
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{ fetchurl, unzip }:
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{ # Optionally move the contents of the unpacked tree up one level.
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stripRoot ? true
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, url
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, extraPostFetch ? ""
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, name ? "source"
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, ... } @ args:
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(fetchurl ({
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inherit name;
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recursiveHash = true;
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downloadToTemp = true;
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postFetch =
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''
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unpackDir="$TMPDIR/unpack"
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mkdir "$unpackDir"
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cd "$unpackDir"
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renamed="$TMPDIR/${baseNameOf url}"
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mv "$downloadedFile" "$renamed"
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unpackFile "$renamed"
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''
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+ (if stripRoot then ''
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if [ $(ls "$unpackDir" | wc -l) != 1 ]; then
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echo "error: zip file must contain a single file or directory."
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echo "hint: Pass stripRoot=false; to fetchzip to assume flat list of files."
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exit 1
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fi
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fn=$(cd "$unpackDir" && echo *)
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if [ -f "$unpackDir/$fn" ]; then
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mkdir $out
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fi
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mv "$unpackDir/$fn" "$out"
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'' else ''
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mv "$unpackDir" "$out"
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'')
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+ extraPostFetch
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# Remove write permissions for files unpacked with write bits set
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# Fixes https://github.com/NixOS/nixpkgs/issues/38649
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#
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# However, we should (for the moment) retain write permission on the directory
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# itself, to avoid tickling https://github.com/NixOS/nix/issues/4295 in
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# single-user Nix installations. This is because in sandbox mode we'll try to
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# move the path, and if we don't have write permissions on the directory,
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# then we can't update the ".." entry.
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+ ''
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chmod -R a-w "$out"
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chmod u+w "$out"
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'';
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} // removeAttrs args [ "stripRoot" "extraPostFetch" ])).overrideAttrs (x: {
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# Hackety-hack: we actually need unzip hooks, too
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nativeBuildInputs = x.nativeBuildInputs ++ [ unzip ];
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})
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