Add draft post

source/_posts/finding-the-last-commit-that-a-patch-applies-to.md

@@ -0,0 +1,47 @@
+---
+title: Finding the last commit that a patch applies to
+excerpt: How to find the last commit in a Git repository that a patch applies to.
+date: 2020-03-26
+tags: [bash, git]
+draft: true
+---
+
+```bash
+#!/usr/bin/env bash
+
+# https://www.drupal.org/files/issues/2018-08-28/group-configurable-entities-as-group-content-2797793-58.patch
+
+patch_filename=group-configurable-entities-as-group-content-2797793-58.patch
+first_commit=6e8c22a
+last_commit=8.x-1.x
+
+find_commits_between() {
+  first_commit=$1
+  last_commit=$2
+
+  git rev-list --reverse --ancestry-path $first_commit^...$last_commit
+}
+
+reset_repo() {
+  git reset --hard $1 >& /dev/null
+}
+
+apply_patch() {
+  git apply --check $patch_filename >& /dev/null
+}
+
+for sha1 in $(find_commits_between $first_commit $last_commit); do
+  echo "Trying ${sha1}..."
+
+  reset_repo $sha1
+  apply_patch
+
+  if [[ $? -eq 0 ]]; then
+    echo "Patch applies"
+    continue
+  fi
+
+  echo "Patch does not apply"
+  exit 1
+done
+```