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#! /usr/bin/env sh
set -eu
_NIX_WRAPPER_FALLBACK="${_NIX_WRAPPER_FALLBACK-false}"
me="$(basename "$0")"
if [ "$_NIX_WRAPPER_FALLBACK" = "true" ]; then
# Allow skipping the size check.
"$me" "$@"
else
usage="$(btrfs filesystem usage /nix --raw 2>/dev/null)"
avail="$(echo "$usage" | grep 'Device size:' | cut -f 3 | sed 's/ //g')"
used="$(echo "$usage" | grep 'Used:' | cut -f 4 | head -n 1 | sed 's/ //g')"
perc="$(printf "scale=4\n%d / %d\n" "$used" "$avail" | bc)"
perc="$(printf "scale=2\n%s * 100\n" "0$perc" | bc)"
if test "$(printf "%s >= 20\n" "$perc" | bc)" = "1"; then
"$me" "$@"
else
echo "Not enough space free, in nix store: Only, $perc% is still free."
exit 3
fi
fi
# vim: ft=sh
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