feat: initial commit

Dockerfile

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+FROM alpine
+
+LABEL "com.github.actions.name"="Git Sync Action"
+LABEL "com.github.actions.description"="🔃 Sync between two independent repositories"
+LABEL "com.github.actions.icon"="git-branch"
+LABEL "com.github.actions.color"="black"
+
+LABEL "repository"="http://github.com/wei/git-sync"
+LABEL "homepage"="http://github.com/wei/git-sync"
+LABEL "maintainer"="Wei He <[email protected]>"
+
+RUN apk add --no-cache git openssh-client && \
+  echo "StrictHostKeyChecking no" >> /etc/ssh/ssh_config
+
+ADD *.sh /
+
+ENTRYPOINT ["/entrypoint.sh"]

README.md

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+# Git Sync
+
+A GitHub Action for syncing between two independent repositories using **force push**. 
+
+
+## Features
+ * Sync branches between two Github repositories
+ * Sync branches to/from a remote repository
+ * Github action can be triggered on a timer or on push
+
+
+## Usage
+
+### Github Actions
+```
+action "repo-sync" {
+  uses = "wei/git-sync@master"
+  args = "$SOURCE_REPO $SOURCE_BRANCH $DESTINATION_REPO $DESTINATION_BRANCH"
+  env = {
+    SOURCE_REPO = ""
+    SOURCE_BRANCH = ""
+    DESTINATION_REPO = ""
+    DESTINATION_BRANCH = ""
+  }
+  secrets = ["SSH_PRIVATE_KEY"]
+}
+```
+`SSH_PRIVATE_KEY` can be omitted if using authenticated HTTPS repo clone urls like `https://username:[email protected]/username/repository.git`.
+
+### Docker
+```
+docker run --rm -e "SSH_PRIVATE_KEY=$(cat ~/.ssh/id_rsa)" $(docker build -q .) \
+  $SOURCE_REPO $SOURCE_BRANCH $DESTINATION_REPO $DESTINATION_BRANCH
+```
+
+## Author
+[Wei He](https://github.com/wei) _[email protected]_
+
+
+## License
+[MIT](https://wei.mit-license.org)

entrypoint.sh

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+#!/bin/sh
+
+set -e
+
+if [[ -n "$SSH_PRIVATE_KEY" ]]
+then
+  mkdir -p /root/.ssh
+  echo "$SSH_PRIVATE_KEY" > /root/.ssh/id_rsa
+  chmod 600 /root/.ssh/id_rsa
+fi
+
+mkdir -p ~/.ssh
+cp /root/.ssh/* ~/.ssh/ 2> /dev/null || true 
+
+sh -c "/git-sync.sh $*"

git-sync.sh

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+#!/bin/sh
+
+set -e
+
+SOURCE_REPO=$1
+SOURCE_BRANCH=$2
+DESTINATION_REPO=$3
+DESTINATION_BRANCH=$4
+
+if ! echo $SOURCE_REPO | grep '.git'
+then
+  if [[ -n "$SSH_PRIVATE_KEY" ]]
+  then
+    SOURCE_REPO="[email protected]:${SOURCE_REPO}.git"
+    GIT_SSH_COMMAND="ssh -v"
+  else
+    SOURCE_REPO="https://github.com/${SOURCE_REPO}.git"
+  fi
+fi
+if ! echo $DESTINATION_REPO | grep '.git'
+then
+  if [[ -n "$SSH_PRIVATE_KEY" ]]
+  then
+    DESTINATION_REPO="[email protected]:${DESTINATION_REPO}.git"
+    GIT_SSH_COMMAND="ssh -v"
+  else
+    DESTINATION_REPO="https://github.com/${DESTINATION_REPO}.git"
+  fi
+fi
+
+echo "SOURCE=$SOURCE_REPO:$SOURCE_BRANCH"
+echo "DESTINATION=$DESTINATION_REPO:$DESTINATION_BRANCH"
+
+git clone "$SOURCE_REPO" --origin source && cd `basename "$SOURCE_REPO" .git`
+git checkout "$SOURCE_BRANCH"
+git show --name-status
+git remote add destination "$DESTINATION_REPO"
+git remote -v
+git push destination "${SOURCE_BRANCH}:${DESTINATION_BRANCH}" -f