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#!/usr/bin/env bash
# Prints build logs for failed derivations in quiet build mode (-Q).
# See https://github.com/NixOS/nix/issues/443
#
# Usage:
#
# set -o pipefail
# nix-build ... -Q ... | whatsupnix
#
GAWK=${GAWK:-gawk}
NIX_STORE=${NIX_STORE:-nix-store}
broken=$(mktemp)
trap 'rm -f -- "$broken"' EXIT
exec >&2
$GAWK -v broken="$broken" -f <(cat - <<- 'AWK'
match($0, /builder for .*(\/nix\/store\/.+\.drv).* failed/, m) {
print m[1] >> broken
}
{ print $0 }
AWK
)
export NIX_PAGER='' # for nix-store
while read -r drv; do
title="** FAILED $drv LOG **"
frame=${title//?/*}
echo "$frame"
echo "$title"
echo "$frame"
echo
$NIX_STORE -l "$drv"
echo
done < "$broken"
exit 0
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