#!/usr/bin/env bash
# The engine gate (7 October 2026, the Devnet 3 start): a 21d8f454 igneumd with its commit string twice but ZERO igneum-pow/src/
# paths was placed in the artefact folder by a build outside the app tree; the fleet's hub ran it, the igneum-pow miner's blocks
# were every one rejected (Reject(BlockInvalid)), the go stopped. The commit-string gate cannot see this: the string comes from the
# fork's own git, the engine from the igneum-pow tree the build sat next to. So every igneumd and igneum-miner that
# tools/build-remote.sh fetches must carry igneum-pow source paths in its strings (rustc embeds the panic locations of the engine
# crate it compiled in: igneum-pow/src/..., or igneum-pow-amend/src/... when the fork pairs through its paths override); none means
# the stub engine or no paired tree, and the fetch refuses; the matched directory name is printed so the pairing is visible.
#
#   tools/ci/engine-check.sh <binary>              # exit 0 with the count, exit 1 "no igneum-pow/src/ path in <binary>"
#   tools/ci/engine-check.sh --self-test           # a fixture with the paths passes, one without fails
set -euo pipefail
if [ "${1:-}" = --self-test ]; then
  t=$(mktemp -d); trap 'rm -rf "$t"' EXIT
  printf 'binary junk\0/srv/builds/x/igneum-pow/src/lib.rs\0more junk\0igneum-pow/src/lottery.rs\0' > "$t/good"
  printf 'binary junk\0/srv/builds/x/igneum-pow-amend/src/lib.rs\0igneum-pow-amend/src/lottery.rs\0' > "$t/amend"
  printf 'binary junk\0/srv/builds/x/consensus/pow/src/stub.rs\0commit 21d8f454\0' > "$t/bad"
  out=$("$0" "$t/good") || { echo "engine-check self-test: a binary WITH igneum-pow/src/ paths was refused"; exit 1; }
  case "$out" in *"igneum-pow/src/ 2 paths"*) ;; *) echo "engine-check self-test: the matched directory is not printed: $out"; exit 1 ;; esac
  out=$("$0" "$t/amend") || { echo "engine-check self-test: a binary paired through igneum-pow-amend/src/ was refused"; exit 1; }
  case "$out" in *"igneum-pow-amend/src/ 2 paths"*) ;; *) echo "engine-check self-test: the amend directory is not printed: $out"; exit 1 ;; esac
  if "$0" "$t/bad" >/dev/null 2>&1; then echo "engine-check self-test: a binary WITHOUT igneum-pow paths passed"; exit 1; fi
  echo "engine-check self-test: igneum-pow/src/ and igneum-pow-amend/src/ pass with the directory named, a binary without is refused"; exit 0
fi
f="${1:-}"; [ -f "$f" ] || { echo "engine-check: no file '$f'" >&2; exit 2; }
# any directory name beginning igneum-pow and ending /src/ (the fork pairs its pow through a paths override that may name the tree
# igneum-pow-amend, the archive of 017e7037; the shipper, 7 Oct 2026); the matched name is printed so the pairing is visible
dirs=$(LC_ALL=C grep -a -oE 'igneum-pow[A-Za-z0-9._-]*/src/' "$f" | sort | uniq -c | awk '{printf "%s %s paths; ", $2, $1}')
n=$(LC_ALL=C grep -a -c -E 'igneum-pow[A-Za-z0-9._-]*/src/' "$f" || true)
if [ "${n:-0}" -gt 0 ]; then echo "engine-check: $(basename "$f") paired: ${dirs% }"; exit 0; fi
echo "engine-check: no igneum-pow*/src/ path in $(basename "$f"): the stub engine or no paired igneum-pow tree (the commit string alone does not prove the engine; 7 Oct 2026 Devnet 3)" >&2
exit 1