ci: Leave out last commit in all_commits.

- If there is only one commit do not rebase at all.
  An empty rebase with --exec will still run the exec command once.

- Fixes #628.

1 files changed, 26 insertions, 0 deletions

diff --git a/.ci/all_commits.sh b/.ci/all_commits.sh
new file mode 100755
index 00000000..b44f48c5
--- /dev/null
+++ b/.ci/all_commits.sh
@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+
+# Test all commits on this branch but the last one.
+#
+# Used in the all_commits ci job to ensure all commits build
+# and tests pass at least for the sequoia-openpgp crate.
+
+# Use dummy identity to make git rebase happy.
+git config user.name "C.I. McTestface"
+git config user.email "ci.mctestface@example.com"
+
+# If the previous commit already is on main we're done.
+git merge-base --is-ancestor HEAD~ origin/main &&
+  echo "All commits tested already" &&
+  exit 0
+
+# Leave out the last commit - it has already been checked.
+git checkout HEAD~
+git rebase origin/main \
+           --exec 'echo ===; echo ===; echo ===; git log -n 1;' \
+           --exec 'cargo test -p sequoia-openpgp' &&
+  echo "All commits passed tests" &&
+  exit 0
+
+# The rebase failed - probably because a test failed.
+git rebase --abort; exit 1