Merge bitcoin/bitcoin#26591: [24.x] ci: Skip COMMIT_RANGE if no CIRRUS_PR

fad1c55301b9f2d091d3b0d8a75ff522ce8dae5a lint: Skip COMMIT_RANGE if no CIRRUS_PR (MarcoFalke)

Pull request description:

  Identical commit from https://github.com/bitcoin/bitcoin/pull/26588

  Untested, but this may fix the red-ness in https://cirrus-ci.com/github/bitcoin/bitcoin/24.x, e.g. https://cirrus-ci.com/task/4697153604419584:

  Backport requested in https://github.com/bitcoin/bitcoin/pull/26588#issuecomment-1328916876

ACKs for top commit:
  hebasto:
    ACK fad1c55301b9f2d091d3b0d8a75ff522ce8dae5a, the same commit as in #26588.

Tree-SHA512: 8d8a735e25bc1f774f8cbf058b95b7019941138ab78fb7819852755c7a416a783ee116457b97031d447639002353d7bf12ee8445275b7b5eec4abc7421cc171d

ci/lint/06_script.sh

@@ -9,7 +9,12 @@ export LC_ALL=C
 GIT_HEAD=$(git rev-parse HEAD)
 if [ -n "$CIRRUS_PR" ]; then
   COMMIT_RANGE="${CIRRUS_BASE_SHA}..$GIT_HEAD"
+  echo
+  git log --no-merges --oneline "$COMMIT_RANGE"
+  echo
   test/lint/commit-script-check.sh "$COMMIT_RANGE"
+else
+  COMMIT_RANGE="SKIP_EMPTY_NOT_A_PR"
 fi
 export COMMIT_RANGE
 
@@ -36,8 +41,3 @@ if [ "$CIRRUS_REPO_FULL_NAME" = "bitcoin/bitcoin" ] && [ "$CIRRUS_PR" = "" ] ; t
     ${CI_RETRY_EXE} gpg --keyserver hkps://keys.openpgp.org --recv-keys "${KEYS[@]}" &&
     ./contrib/verify-commits/verify-commits.py;
 fi
-
-if [ -n "$COMMIT_RANGE" ]; then
-  echo
-  git log --no-merges --oneline "$COMMIT_RANGE"
-fi

test/lint/lint-git-commit-check.py

@@ -46,6 +46,8 @@ def main():
             commit_range = merge_base + "..HEAD"
     else:
         commit_range = os.getenv("COMMIT_RANGE")
+        if commit_range == "SKIP_EMPTY_NOT_A_PR":
+            sys.exit(0)
 
     commit_hashes = check_output(["git", "log", commit_range, "--format=%H"], universal_newlines=True, encoding="utf8").splitlines()
 

test/lint/lint-whitespace.py

@@ -97,6 +97,8 @@ def main():
             commit_range = merge_base + "..HEAD"
     else:
         commit_range = os.getenv("COMMIT_RANGE")
+        if commit_range == "SKIP_EMPTY_NOT_A_PR":
+            sys.exit(0)
 
     whitespace_selection = []
     tab_selection = []