From 992214329cc17706e8aa7c1a5a38839ef3e2c529 Mon Sep 17 00:00:00 2001
From: Nikolaos Karaolidis <nick@karaolidis.com>
Date: Wed, 22 Mar 2023 18:02:55 +0200
Subject: [PATCH] Initial commit

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>
---
 Dockerfile | 15 +++++++++++++++
 README.md  | 21 +++++++++++++++++++++
 sync.sh    | 41 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 77 insertions(+)
 create mode 100644 Dockerfile
 create mode 100644 README.md
 create mode 100755 sync.sh

diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..42499be
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,15 @@
+FROM alpine
+
+RUN apk add --no-cache git
+
+RUN mkdir /git
+COPY sync.sh .
+RUN chmod +x sync.sh
+
+RUN adduser -D -u 1000 -s /bin/sh app
+RUN chown -R app:app /git  
+USER app
+
+WORKDIR /git
+
+CMD ["/sync.sh"]
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..b6bf6df
--- /dev/null
+++ b/README.md
@@ -0,0 +1,21 @@
+# git-dual-sync
+
+A simple docker image that syncs one git remote to another.
+
+## Environment Variables
+
+| Variable       | Description                        |
+| -------------- | ---------------------------------- |
+| `GIT_ORIGIN`   | The origin remote to sync to       |
+| `GIT_UPSTREAM` | The upstream remote to sync from   |
+| `GIT_BRANCH`   | The branch to sync                 |
+| `GIT_NAME`     | The name to use for the commit     |
+| `GIT_EMAIL`    | The email to use for the commit    |
+| `GIT_USER`     | The username to use for the commit |
+| `GIT_PASS`     | The password to use for the commit |
+
+## Volumes
+
+| Volume | Description                |
+| ------ | -------------------------- |
+| `/git` | The git repository to sync |
diff --git a/sync.sh b/sync.sh
new file mode 100755
index 0000000..7b82ebe
--- /dev/null
+++ b/sync.sh
@@ -0,0 +1,41 @@
+#!/bin/bash
+
+if [ -z "$GIT_ORIGIN" ] || [ -z "$GIT_UPSTREAM" ] || [ -z "$GIT_BRANCH" ] || [ -z "$GIT_NAME" ] || [ -z "$GIT_EMAIL" ] || [ -z "$GIT_USER" ] || [ -z "$GIT_PASS" ]; then
+    echo "Environment variables not set"
+    exit 1
+fi
+
+git config --global user.name "$GIT_NAME"
+git config --global user.email "$GIT_EMAIL"
+
+PLAIN_URL=$(echo "$GIT_ORIGIN" | sed 's/https:\/\///')
+AUTH_URL="https://$GIT_USER:$GIT_PASS@$PLAIN_URL"
+
+WORKDIR="./git"
+mkdir -p "$WORKDIR"
+
+if [ ! -d "$WORKDIR/.git" ]; then
+    echo "Cloning repo"
+    git clone "$AUTH_URL" "$WORKDIR"
+fi
+
+cd "$WORKDIR"
+
+if [ -z "$(git remote | grep origin)" ]; then
+    git remote add origin "$GIT_ORIGIN"
+elif [ "$(git config --get remote.origin.url)" != "$GIT_ORIGIN" ]; then
+    git remote set-url origin "$GIT_ORIGIN"
+fi
+
+if [ -z "$(git remote | grep upstream)" ]; then
+    git remote add upstream "$GIT_UPSTREAM"
+elif [ "$(git config --get remote.upstream.url)" != "$GIT_UPSTREAM" ]; then
+    git remote set-url upstream "$GIT_UPSTREAM"
+fi
+
+git fetch origin
+git fetch upstream
+git pull origin "$GIT_BRANCH"
+git checkout "$GIT_BRANCH"
+git merge upstream/"$GIT_BRANCH" --no-edit
+git push $AUTH_URL "$GIT_BRANCH"