++ mktemp -d
+ checkout=/tmp/tmp.UCHk2G5Itj
+ trap 'rm -rf "$checkout"' EXIT
+ cp -R /var/lib/ci-tron/sources/ef613088371902c8/. /tmp/tmp.UCHk2G5Itj
+ cd /tmp/tmp.UCHk2G5Itj
+ nix develop --command python3 scripts/capabilities.py docs --check
GC Warning: Could not open /proc/stat
+ rm -rf /tmp/tmp.UCHk2G5Itj