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nixpkgs/pkgs/stdenv/freebsd/unpack-source.sh
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unpackCmdHooks+=(_FreeBSDUnpackSource)
_FreeBSDUnpackSource() {
local fn="$1"
local destination
if [ -d "$fn" ]; then
destination="$(stripHash "$fn")"
if [ -e "$destination" ]; then
echo "Cannot copy $fn to $destination: destination already exists!"
echo "Did you specify two \"srcs\" with the same \"name\"?"
return 1
fi
# We can't preserve hardlinks because they may have been
# introduced by store optimization, which might break things
# in the build.
bsdcp -a -- "$fn" "$destination"
chmod -R +w "$destination"
else
case "$fn" in
*.tar.xz | *.tar.lzma | *.txz)
# Don't rely on tar knowing about .xz.
xz -d < "$fn" | tar xf - --warning=no-timestamp
;;
*.tar | *.tar.* | *.tgz | *.tbz2 | *.tbz)
# GNU tar can automatically select the decompression method
# (info "(tar) gzip").
tar xf "$fn" --warning=no-timestamp
;;
*)
return 1
;;
esac
fi
}