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nixpkgs/pkgs/by-name/dp/dpkg/setup-hook.sh
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unpackCmdHooks+=(_tryDpkgDeb)
_tryDpkgDeb() {
if ! [[ "$curSrc" =~ \.deb$ ]]; then return 1; fi
# Don't use dpkg-deb -x as that will error if the archive contains a file
# or directory with a setuid bit in its permissions. This is because dpkg
# calls tar internally with the -p flag, preserving file permissions.
#
# We instead only use dpkg-deb to extract the tarfile containing the files
# we want from the .deb, then finish extracting with tar directly.
mkdir root
dpkg-deb --fsys-tarfile "$curSrc" | tar --extract --directory=root
}