From 0b238364727f2fb66e46ed812d2258b6ead7f7c6 Mon Sep 17 00:00:00 2001
From: Steven Allen <steven@stebalien.com>
Date: Mon, 10 May 2021 18:49:37 -0700
Subject: [PATCH] fix(mkreleasenotes): handle first commit

It has no parents.
---
 scripts/mkreleaselog | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/scripts/mkreleaselog b/scripts/mkreleaselog
index ee8759aa55..1c0678620b 100755
--- a/scripts/mkreleaselog
+++ b/scripts/mkreleaselog
@@ -120,8 +120,10 @@ release_log() {
         "$start..$end" |
         while read commit subject; do
             # Skip gx-only PRs.
-            git -C "$dir" diff-tree --no-commit-id --name-only "$commit^" "$commit" |
-                grep -v "${IGNORED_FILES}" >/dev/null || continue
+            if git rev-parse '$commit^' >/dev/null 2>&1 &&
+                   ! git -C "$dir" diff-tree --no-commit-id --name-only "$commit^" "$commit" | grep -v "${IGNORED_FILES}" >/dev/null; then
+                continue
+            fi
 
             if [[ "$subject" =~ '^Merge pull request #([0-9]+) from' ]]; then
                 local prnum="${BASH_REMATCH[2]}"