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Dockerfile

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+FROM istepanov/cron
+MAINTAINER Ilya Stepanov <dev@ilyastepanov.com>
+
+RUN apk add --no-cache git ca-certificates
+
+RUN mkdir -p /target
+
+ENV GIT_BRANCH 'master'
+ENV GIT_COMMIT_MESSAGE 'Automatic backup'
+ENV TARGET_FOLDER '/target'

README.md

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+istepanov/backup-to-git
+=======================
+
+[![Docker Stars](https://img.shields.io/docker/stars/istepanov/backup-to-git.svg)](https://hub.docker.com/r/istepanov/backup-to-git/)
+[![Docker Pulls](https://img.shields.io/docker/pulls/istepanov/backup-to-git.svg)](https://hub.docker.com/r/istepanov/backup-to-git/)
+[![Docker Build](https://img.shields.io/docker/automated/istepanov/backup-to-git.svg)](https://hub.docker.com/r/istepanov/backup-to-git/)
+[![Layers](https://images.microbadger.com/badges/image/istepanov/backup-to-git.svg)](https://microbadger.com/images/istepanov/backup-to-git)
+
+Docker container that periodically backups files to a remote git repository.
+
+### Usage
+
+    docker run -d [OPTIONS] istepanov/backup-to-git [no-cron]
+
+### Required parameters:
+
+* `-e GIT_NAME='Backup User'`: git user name.
+* `-e GIT_EMAIL='backup_user@example.com'`: git user email.
+* `-e GIT_URL=https://username:password@example.com/path`: git remote repo.
+* `-v /path/to/target/folder:/target:ro`: mount target local folder to container's data folder. Content of this folder will be pushed to git repo.
+
+### Optional parameters:
+
+* `-e 'CRON_SCHEDULE=0 1 * * *'`: specifies when cron job starts ([details](http://en.wikipedia.org/wiki/Cron)). Default is `0 1 * * *` (runs every day at 1:00 am).
+* `-e GIT_BRANCH=branch_name`: git branch to put commits to (default is 'master').
+* `-e GIT_COMMIT_MESSAGE='Custom message'`: Custom commit message (default is 'Automatic backup').
+* `-e TARGET_FOLDER=/target`: target folder inside the container (default is '/target').
+
+### Commands:
+
+* `no-cron`: if specified, run container once and exit (no cron scheduling).
+
+### Examples:
+
+Backup changes to git every minute:
+
+    docker run -d \
+        -v GIT_NAME: 'Backup User' \
+        -v GIT_EMAIL: 'backup_user@example.com' \
+        -v GIT_URL: https://username:password@bitbucket.org/username/repo.git
+        -v  CRON_SCHEDULE: '* * * * *'
+        -v /home/user/data:/target:ro
+        istepanov/backup-to-git

command.sh

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+#!/bin/bash
+
+set -e
+
+# required env vars
+: ${GIT_NAME:?"GIT_NAME env variable is required"}
+: ${GIT_EMAIL:?"GIT_EMAIL env variable is required"}
+: ${GIT_URL:?"GIT_URL env variable is required"}
+
+export GIT_DIR="/var/git"
+export GIT_WORK_TREE="$TARGET_FOLDER"
+
+echo "Job started: $(date)"
+echo "$GIT_WORK_TREE"
+
+if [ ! -d "$GIT_DIR" ]; then
+    mkdir -p "$GIT_DIR"
+    git init
+    git config user.name "$GIT_NAME"
+    git config user.email "$GIT_EMAIL"
+    git remote add origin "$GIT_URL"
+
+    mkdir -p "$GIT_DIR/info"
+    echo '' > "$GIT_DIR/info/exclude"
+    while IFS=';' read -ra IGNORE_PATTERNS; do
+        for i in "${IGNORE_PATTERNS[@]}"; do
+            echo "$i" >> "$GIT_DIR/info/exclude"
+        done
+    done <<< "$GIT_IGNORE"
+
+    git fetch --all
+    git symbolic-ref HEAD refs/remotes/origin/$GIT_BRANCH
+    git reset
+    git checkout -b $GIT_BRANCH
+
+    # to get rid of ignored files that are already commited to the repo,
+    # remove all files for index (but not from working directory!),
+    # then re-add everything back to index
+    git rm -r --cached . > /dev/null || true
+fi
+
+git add -A
+
+git commit -m "$GIT_COMMIT_MESSAGE"
+git push origin $GIT_BRANCH
+
+echo "Job finished: $(date)"