liminix/pkgs/min-copy-closure/min-copy-closure.sh

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#!/usr/bin/env bash
target_host=$1
shift
paths=$(nix-store -q --requisites "$@")
needed=""
coproc remote {
ssh -C ${target_host}
}
exec 10>&${remote[1]}
for p in $paths; do
echo "test -e $p && echo skip || echo $p" >&10
read n <&${remote[0]}
case $n in
skip)
:
;;
*)
needed="${needed} $n"
echo Will copy $n
;;
esac
done
if test -z "$needed" ; then
echo Nothing to copy
exit 1
fi
echo "cd / && cpio -v -i >/dev/console" >&10
find $needed | cpio -H newc -o >&10
echo "date" >&10
read n <&${remote[0]}
echo $n