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|
#! @shell@
WORKING_DIRECTORY=$(mktemp -d "${TMPDIR:-/tmp}"/nix-reduce-build-XXXXXX);
cd "$WORKING_DIRECTORY";
if test -z "$1" ; then
echo 'nix-reduce-build (paths or Nix expressions) -- (logins at remote computers)' >&2
echo As in: >&2
echo nix-reduce-build /etc/nixos/nixos -- user@somewhere.nowhere.example.org >&2
exit;
fi;
while ! test "$1" = "--" || test "$1" = "" ; do
echo "$1" >> initial; >&2
shift;
done
shift;
echo Will work on $(cat initial | wc -l) targets. >&2
while read ; do
case "$REPLY" in
${NIX_STORE_PATH:-/nix/store}/*)
echo "$REPLY" >> paths; >&2
;;
*)
nix-instantiate "$REPLY" >> paths;
;;
esac;
done < initial;
echo Proceeding $(cat paths | wc -l) paths. >&2
while read; do
case "$REPLY" in
*.drv)
echo "$REPLY" >> derivers; >&2
;;
*)
nix-store --query --deriver "$REPLY" >>derivers;
;;
esac;
done < paths;
echo Found $(cat derivers | wc -l) derivers. >&2
cat derivers | xargs nix-store --query -R > derivers-closure;
echo Proceeding at most $(cat derivers-closure | wc -l) derivers. >&2
cat derivers-closure | egrep '[.]drv$' | xargs nix-store --query --outputs > wanted-paths;
cat derivers-closure | egrep -v '[.]drv$' >> wanted-paths;
echo Prepared $(cat wanted-paths | wc -l) paths to get. >&2
cat wanted-paths | xargs nix-store --check-validity --print-invalid > needed-paths;
echo We need $(cat needed-paths | wc -l) paths. >&2
if test -z "$1" ; then
cat needed-paths;
fi;
for i in "$@"; do
cat needed-paths | while read; do
nix-copy-closure --from "$i" --gzip "$REPLY" </dev/null || true;
done;
mv needed-paths wanted-paths;
cat wanted-paths | xargs nix-store --check-validity --print-invalid > needed-paths;
echo We still need $(cat needed-paths | wc -l) paths. >&2
done;
cd /
rm -r "$WORKING_DIRECTORY"
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