1 files changed, 74 insertions, 0 deletions
diff --git a/scripts/git-sync b/scripts/git-sync
new file mode 100755
index 0000000..deb19bc
--- /dev/null
+++ b/scripts/git-sync
@@ -0,0 +1,74 @@
+#!/bin/bash
+set -e
+
+hosthash=$(python3 -c "import uuid, hashlib
+print(hashlib.new('sha1', str(uuid.getnode()).encode('utf8')).hexdigest())")
+
+if [ -d "$(git rev-parse --git-dir)/annex" ]; then
+    echo 'Sync: using git annex'
+    exec git annex sync "$@"
+fi
+
+# determine current branch name
+branch_name=$(git symbolic-ref -q --short HEAD)
+
+# remote name
+remote_name=$(git config --get branch.${branch_name}.remote || true)
+
+# conflict commit message
+conflict_message="Merge conflict autocommit on ${hosthash}"
+
+if [ -z "$remote_name" ]; then
+    echo "No remote for this repository" >&2
+    exit 1
+fi
+
+if [ "$(git config --get --bool branch.${branch_name}.sync)" != "true" ]; then
+    echo "Branch is not configured to accept git-sync" >&2
+    echo "To accept git-sync operation, set current branch sync to true:" >&2
+    echo "    git config --bool branch.${branch_name}.sync true" >&2
+    exit 1
+fi
+
+echo 'Sync: git autocommit'
+git add -A "./$(git rev-parse --show-cdup)"
+git commit -m "Auto-commit on ${hosthash}" >/dev/null 2>&1 || true
+
+echo 'Sync: fetch and merge'
+
+git fetch
+
+# might fail one time if conflict detected
+git merge -m "$conflict_message" || true
+
+echo 'Sync: conflict autocommit'
+
+git status --porcelain | while read -r filename; do
+    state="${filename:0:2}"
+    filename="${filename:3}"
+    ours="${filename}.${hosthash}.conflict"
+    theirs="${filename}.${remote_name}.conflict"
+    case "$state" in
+        *U*)
+            git checkout --ours -- "$filename"
+            mv -i -- "$filename" "$ours"
+            git add -- "$ours"
+            git checkout --theirs -- "$filename"
+            cp -ai -- "$filename" "$theirs"
+            git add -- "$filename"
+            git add -- "$theirs"
+        ;;
+    esac
+done
+
+# no action is done if there is nothing to commit
+git commit -m "$conflict_message" || true
+
+# should not fail again
+git merge -m "$conflict_message"
+
+echo 'Sync: pushing changes'
+
+git push
+
+echo 'Sync: done'