contrib: add git-sync container

contrib/git-sync/Dockerfile

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+FROM golang:1.4-onbuild
+VOLUME ["/git"]
+ENV GIT_SYNC_DEST /git
+ENTRYPOINT ["/go/bin/git-sync"]

contrib/git-sync/README.md

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+# git-sync
+
+git-sync is a command that pull a git repository to a local directory.
+
+It can be used to source a container volume with the content of a git repo.
+
+## Usage
+
+```
+# build the container
+docker build -t git-sync .
+# run the git-sync container
+docker run -d GIT_SYNC_REPO=https://github.com/GoogleCloudPlatform/kubernetes -e GIT_SYNC_BRANCH=gh-pages -r HEAD -v /git-data:/git git-sync
+# run a nginx container to serve sync'ed content
+docker run -d -p 8080:80 -v /git-data:/usr/share/nginx/html nginx 
+```

contrib/git-sync/demo/README.md

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+# git-blog-demo
+
+This demo shows how to use the `git-sync` sidekick container along side `volumes` and `volumeMounts` to create a markdown powered blog.
+
+## How it works
+
+The pod is composed of 3 containers that share directories using 2 volumes:
+
+- The `git-sync` container clones a git repo into the `markdown` volume
+- The `hugo` container read from the `markdown` volume and render it into the `html` volume.
+- The `nginx` container serve the content from the `html` volume.
+
+## Usage
+
+Build the demo containers, and push them to a registry
+
+```
+docker build -t <some-registry>/git-sync ..
+docker build -t <some-registry>/hugo hugo/
+docker push <some-registry>/hugo <some-registry>/git-sync
+```
+
+Create the pod and the service for the blog
+
+```
+kubectl pods create config/pod.html
+kubectl services create config/pod.html
+```
+
+Open the service external ip in your browser

contrib/git-sync/demo/blog/config.toml

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+baseurl = "http://example.com"
+languageCode = "en-us"
+title = "example blog"

contrib/git-sync/demo/blog/content/about.md

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++++
+date = "2014-12-19T15:29:48-08:00"
+draft = true
+title = "about"
++++
+
+## A headline
+
+Some content about the blog.

contrib/git-sync/demo/blog/content/post/first.md

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++++
+date = "2014-12-19T15:30:18-08:00"
+draft = true
+title = "first"
++++
+
+## first port
+
+This is the first post.

contrib/git-sync/demo/config/pod.yaml

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+id: blog-pod
+kind: Pod
+apiVersion: v1beta1
+desiredState:
+  manifest:
+    version: v1beta1
+    containers:
+    - name: git-sync
+      image: proppy/git-sync
+      imagePullPolicy: PullAlways
+      env::
+        - name: GIT_SYNC_REPO
+          value: https://github.com/proppy/blog.git
+        - name: GIT_SYNC_DEST
+          value: /git
+      volumeMounts:
+      - name: markdown
+        mountPath: /git
+    - name: hugo
+      image: proppy/hugo
+      imagePullPolicy: PullAlways
+      env:
+      - name: SRC
+        value: /src
+      - name: BUILD_DRAFT
+        value: 'true'
+      - name: BASE_URL
+        value: kube.proppy.sh
+      volumeMounts:
+      - name: markdown
+        mountPath: /src
+      - name: html
+        mountPath: /dest
+    - name: nginx
+      image: nginx
+      volumeMounts:
+      - name: html
+        mountPath: /usr/share/nginx/html
+      ports:
+      - name: http-server
+        containerPort: 80
+    volumes:
+    - name: markdown
+      source:
+        emptyDir: {}
+    - name: html
+      source:
+        emptyDir: {}
+labels:
+  name: blog

contrib/git-sync/demo/config/service.yaml

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+id: blog-service
+kind: Service
+apiVersion: v1beta1
+port: 80
+containerPort: http-server
+selector:
+  name: blog
+createExternalLoadBalancer: true

contrib/git-sync/demo/hugo/Dockerfile

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+FROM golang
+RUN go get -v github.com/spf13/hugo
+RUN git clone --recursive https://github.com/spf13/hugoThemes.git /themes
+VOLUME ["/src", "/dest"]
+EXPOSE 1313
+ENV SRC /src
+ENV DEST /dest
+ENV THEME hyde
+ENV BUILD_DRAFT false
+ENV BASE_URL ""
+ADD run-hugo /run-hugo
+ENTRYPOINT ["/run-hugo"]
+CMD ["server", "--source=${SRC}", "--theme=${THEME}", "--buildDrafts=${BUILD_DRAFT}", "--baseUrl=${BASE_URL}", "--watch", "--destination=${DEST}", "--appendPort=false"]

contrib/git-sync/demo/hugo/run-hugo

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+#!/bin/bash
+
+# Copyright 2014 Google Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -ex
+if [ ! -d ${SRC}/themes ]; then
+    ln -s /themes ${SRC}/themes
+fi
+hugo $(eval echo $*) # force default CMD env expansion

contrib/git-sync/main.go

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+/*
+Copyright 2014 Google Inc. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// git-sync is a command that pull a git repository to a local directory.
+
+package main // import "github.com/GoogleCloudPlatform/kubernetes/contrib/git-sync"
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"os/exec"
+	"path"
+	"strconv"
+	"strings"
+	"time"
+)
+
+var flRepo = flag.String("repo", envString("GIT_SYNC_REPO", ""), "git repo url")
+var flBranch = flag.String("branch", envString("GIT_SYNC_BRANCH", "master"), "git branch")
+var flRev = flag.String("rev", envString("GIT_SYNC_BRANCH", "HEAD"), "git rev")
+var flDest = flag.String("dest", envString("GIT_SYNC_DEST", ""), "destination path")
+var flWait = flag.Int("wait", envInt("GIT_SYNC_WAIT", 0), "number of seconds to wait before exit")
+
+func envString(key, def string) string {
+	if env := os.Getenv(key); env != "" {
+		return env
+	}
+	return def
+}
+
+func envInt(key string, def int) int {
+	if env := os.Getenv(key); env != "" {
+		val, err := strconv.Atoi(env)
+		if err != nil {
+			log.Println("invalid value for %q: using default: %q", key, def)
+			return def
+		}
+		return val
+	}
+	return def
+}
+
+const usage = "usage: GIT_SYNC_REPO= GIT_SYNC_DEST= [GIT_SYNC_BRANCH= GIT_SYNC_WAIT=] git-sync -repo GIT_REPO_URL -dest PATH [-branch -wait]"
+
+func main() {
+	flag.Parse()
+	if *flRepo == "" || *flDest == "" {
+		flag.Usage()
+		log.Fatal(usage)
+	}
+	if _, err := exec.LookPath("git"); err != nil {
+		log.Fatalf("required git executable not found: %v", err)
+	}
+	if err := syncRepo(*flRepo, *flDest, *flBranch, *flRev); err != nil {
+		log.Fatalf("error syncing repo: %v", err)
+	}
+	log.Printf("wait %d seconds", *flWait)
+	time.Sleep(time.Duration(*flWait) * time.Second)
+	log.Println("done")
+}
+
+// syncRepo syncs the branch of a given repository to the destination at the given rev.
+func syncRepo(repo, dest, branch, rev string) error {
+	gitRepoPath := path.Join(dest, ".git")
+	_, err := os.Stat(gitRepoPath)
+	switch {
+	case os.IsNotExist(err):
+		// clone repo
+		cmd := exec.Command("git", "clone", "--no-checkout", "-b", branch, repo, dest)
+		output, err := cmd.CombinedOutput()
+		if err != nil {
+			return fmt.Errorf("error cloning repo %q: %v: %s", strings.Join(cmd.Args, " "), err, string(output))
+		}
+		log.Printf("clone %q: %s", repo, string(output))
+	case err != nil:
+		return fmt.Errorf("error checking if repo exist %q: %v", gitRepoPath, err)
+	}
+
+	// fetch branch
+	cmd := exec.Command("git", "fetch", "origin", branch)
+	cmd.Dir = dest
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("error running command %q: %v: %s", strings.Join(cmd.Args, " "), err, string(output))
+	}
+	log.Printf("fetch %q: %s", branch, string(output))
+
+	// reset working copy
+	cmd = exec.Command("git", "reset", "--hard", rev)
+	cmd.Dir = dest
+	output, err = cmd.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("error running command %q : %v: %s", strings.Join(cmd.Args, " "), err, string(output))
+	}
+	log.Printf("reset %q: %v", rev, string(output))
+	return nil
+}