scripts: Add script to look up commits referenced in Fixes

I've been using (an earlier version of) this for a while, so it's
about time to clean it up and publish it.

scripts/find-commits

diff --git a/scripts/find-commits b/scripts/find-commits
new file mode 100755
index 0000000..dccc439
--- /dev/null
+++ b/scripts/find-commits
@@ -0,0 +1,32 @@
+#!/bin/bash -eu
+
+SCRIPTS="$(dirname "$0")"
+. "$SCRIPTS"/lsq-defs
+
+find_commit() {
+    local full_hash upstream base_ver queue
+
+    if full_hash="$(git rev-parse "$1")" && [ "$full_hash" ]; then
+	if upstream="$(git describe --contains --match 'v*' "$full_hash" 2>/dev/null)"; then
+	    echo "upstream: ${upstream%%[~^]*}"
+	else
+	    echo "upstream: not yet released"
+	fi
+	for base_ver in $STABLE_BASE_VERSIONS; do
+	    git check-in-stable "$full_hash" "$base_ver" | sed 's/^/'"$base_ver"': /'
+	    queue="$(get_queue $base_ver)"
+	    (cd "$queue" && grep -rl "$full_hash" | sed 's/^/'"$base_ver"': queued: /')
+	done
+    fi
+    echo ---
+}
+
+if [ $# -eq 0 ]; then
+    while read hash; do
+	find_commit "$hash"
+    done
+else
+    for hash in "$@"; do
+	find_commit "$hash"
+    done
+fi