Git: Minor fixes. Refactor. Added tests.

config/setup/git.go

@@ -96,6 +96,8 @@ func gitParse(c *Controller) (*git.Repo, error) {
 					return nil, c.ArgErr()
 				}
 				repo.Then = strings.Join(thenArgs, " ")
+			default:
+				return nil, c.ArgErr()
 			}
 		}
 	}
@@ -124,8 +126,8 @@ func gitParse(c *Controller) (*git.Repo, error) {
 		return nil, err
 	}
 
-	// validate git availability in PATH
-	if err = git.InitGit(); err != nil {
+	// validate git requirements
+	if err = git.Init(); err != nil {
 		return nil, err
 	}
 
@@ -153,19 +155,39 @@ func sanitizeHttp(repoUrl string) (string, string, error) {
 	}
 
 	repoUrl = "https://" + url.Host + url.Path
+
+	// add .git suffix if missing
+	if !strings.HasSuffix(repoUrl, ".git") {
+		repoUrl += ".git"
+	}
+
 	return repoUrl, url.Host, nil
 }
 
-// sanitizeGit cleans up repository url and validate ssh format.
+// sanitizeGit cleans up repository url and converts to ssh format for private
+// repositories if required.
 // Returns sanitized url, hostName (e.g. github.com, bitbucket.com)
 // and possible error
 func sanitizeGit(repoUrl string) (string, string, error) {
 	repoUrl = strings.TrimSpace(repoUrl)
+
+	// check if valid ssh format
 	if !strings.HasPrefix(repoUrl, "git@") || strings.Index(repoUrl, ":") < len("git@a:") {
-		return "", "", fmt.Errorf("Invalid git url %s", repoUrl)
+		// check if valid http format and convert to ssh
+		if url, err := url.Parse(repoUrl); err == nil && strings.HasPrefix(url.Scheme, "http") {
+			repoUrl = fmt.Sprintf("git@%v:%v", url.Host, url.Path[1:])
+		} else {
+			return "", "", fmt.Errorf("Invalid git url %s", repoUrl)
+		}
 	}
 	hostUrl := repoUrl[len("git@"):]
 	i := strings.Index(hostUrl, ":")
 	host := hostUrl[:i]
+
+	// add .git suffix if missing
+	if !strings.HasSuffix(repoUrl, ".git") {
+		repoUrl += ".git"
+	}
+
 	return repoUrl, host, nil
 }

config/setup/git_test.go

+package setup
+
+import (
+	"testing"
+	"time"
+
+	"github.com/mholt/caddy/middleware/git"
+	"github.com/mholt/caddy/middleware/git/gittest"
+)
+
+// init sets the OS used to fakeOS
+func init() {
+	git.SetOS(gittest.FakeOS)
+}
+
+func TestGit(t *testing.T) {
+	c := newTestController(`git git@github.com:mholt/caddy.git`)
+
+	mid, err := Git(c)
+	if err != nil {
+		t.Errorf("Expected no errors, but got: %v", err)
+	}
+	if mid != nil {
+		t.Fatal("Git middleware is a background service and expected to be nil.")
+	}
+}
+
+func TestGitParse(t *testing.T) {
+	tests := []struct {
+		input     string
+		shouldErr bool
+		expected  *git.Repo
+	}{
+		{`git git@github.com:user/repo`, false, &git.Repo{
+			Url: "https://github.com/user/repo.git",
+		}},
+		{`git github.com/user/repo`, false, &git.Repo{
+			Url: "https://github.com/user/repo.git",
+		}},
+		{`git git@github.com/user/repo`, true, nil},
+		{`git http://github.com/user/repo`, false, &git.Repo{
+			Url: "https://github.com/user/repo.git",
+		}},
+		{`git https://github.com/user/repo`, false, &git.Repo{
+			Url: "https://github.com/user/repo.git",
+		}},
+		{`git http://github.com/user/repo {
+			key ~/.key
+		}`, false, &git.Repo{
+			KeyPath: "~/.key",
+			Url:     "git@github.com:user/repo.git",
+		}},
+		{`git git@github.com:user/repo {
+			key ~/.key
+		}`, false, &git.Repo{
+			KeyPath: "~/.key",
+			Url:     "git@github.com:user/repo.git",
+		}},
+		{`git `, true, nil},
+		{`git {
+		}`, true, nil},
+		{`git {
+		repo git@github.com:user/repo.git`, true, nil},
+		{`git {
+		repo git@github.com:user/repo
+		key ~/.key
+		}`, false, &git.Repo{
+			KeyPath: "~/.key",
+			Url:     "git@github.com:user/repo.git",
+		}},
+		{`git {
+		repo git@github.com:user/repo
+		key ~/.key
+		interval 600
+		}`, false, &git.Repo{
+			KeyPath:  "~/.key",
+			Url:      "git@github.com:user/repo.git",
+			Interval: time.Second * 600,
+		}},
+		{`git {
+		repo git@github.com:user/repo
+		branch dev
+		}`, false, &git.Repo{
+			Branch: "dev",
+			Url:    "https://github.com/user/repo.git",
+		}},
+		{`git {
+		key ~/.key
+		}`, true, nil},
+		{`git {
+		repo git@github.com:user/repo
+		key ~/.key
+		then echo hello world
+		}`, false, &git.Repo{
+			KeyPath: "~/.key",
+			Url:     "git@github.com:user/repo.git",
+			Then:    "echo hello world",
+		}},
+	}
+
+	for i, test := range tests {
+		c := newTestController(test.input)
+		repo, err := gitParse(c)
+		if !test.shouldErr && err != nil {
+			t.Errorf("Test %v should not error but found %v", i, err)
+			continue
+		}
+		if test.shouldErr && err == nil {
+			t.Errorf("Test %v should error but found nil", i)
+			continue
+		}
+		if !reposEqual(test.expected, repo) {
+			t.Errorf("Test %v expects %v but found %v", i, test.expected, repo)
+		}
+	}
+}
+
+func reposEqual(expected, repo *git.Repo) bool {
+	if expected == nil {
+		return repo == nil
+	}
+	if expected.Branch != "" && expected.Branch != repo.Branch {
+		return false
+	}
+	if expected.Host != "" && expected.Host != repo.Host {
+		return false
+	}
+	if expected.Interval != 0 && expected.Interval != repo.Interval {
+		return false
+	}
+	if expected.KeyPath != "" && expected.KeyPath != repo.KeyPath {
+		return false
+	}
+	if expected.Path != "" && expected.Path != repo.Path {
+		return false
+	}
+	if expected.Then != "" && expected.Then != repo.Then {
+		return false
+	}
+	if expected.Url != "" && expected.Url != repo.Url {
+		return false
+	}
+	return true
+}

middleware/git/git.go

@@ -3,15 +3,14 @@ package git
 import (
 	"bytes"
 	"fmt"
-	"io/ioutil"
 	"log"
 	"os"
-	"os/exec"
 	"strings"
 	"sync"
 	"time"
 
 	"github.com/mholt/caddy/middleware"
+	"github.com/mholt/caddy/middleware/git/gitos"
 )
 
 // DefaultInterval is the minimum interval to delay before
@@ -24,8 +23,11 @@ const numRetries = 3
 // gitBinary holds the absolute path to git executable
 var gitBinary string
 
+// shell holds the shell to be used. Either sh or bash.
+var shell string
+
 // initMutex prevents parallel attempt to validate
-// git availability in PATH
+// git requirements.
 var initMutex sync.Mutex = sync.Mutex{}
 
 // Logger is used to log errors; if nil, the default log.Logger is used.
@@ -120,20 +122,20 @@ func (r *Repo) pull() error {
 // pullWithKey is used for private repositories and requires an ssh key.
 // Note: currently only limited to Linux and OSX.
 func (r *Repo) pullWithKey(params []string) error {
-	var gitSsh, script *os.File
+	var gitSsh, script gitos.File
 	// ensure temporary files deleted after usage
 	defer func() {
 		if gitSsh != nil {
-			os.Remove(gitSsh.Name())
+			gos.Remove(gitSsh.Name())
 		}
 		if script != nil {
-			os.Remove(script.Name())
+			gos.Remove(script.Name())
 		}
 	}()
 
 	var err error
 	// write git.sh script to temp file
-	gitSsh, err = writeScriptFile(gitWrapperScript(gitBinary))
+	gitSsh, err = writeScriptFile(gitWrapperScript())
 	if err != nil {
 		return err
 	}
@@ -163,9 +165,9 @@ func (r *Repo) pullWithKey(params []string) error {
 func (r *Repo) Prepare() error {
 	// check if directory exists or is empty
 	// if not, create directory
-	fs, err := ioutil.ReadDir(r.Path)
+	fs, err := gos.ReadDir(r.Path)
 	if err != nil || len(fs) == 0 {
-		return os.MkdirAll(r.Path, os.FileMode(0755))
+		return gos.MkdirAll(r.Path, os.FileMode(0755))
 	}
 
 	// validate git repo
@@ -180,9 +182,15 @@ func (r *Repo) Prepare() error {
 	if isGit {
 		// check if same repository
 		var repoUrl string
-		if repoUrl, err = r.getRepoUrl(); err == nil && repoUrl == r.Url {
-			r.pulled = true
-			return nil
+		if repoUrl, err = r.getRepoUrl(); err == nil {
+			// add .git suffix if missing for adequate comparison.
+			if !strings.HasSuffix(repoUrl, ".git") {
+				repoUrl += ".git"
+			}
+			if repoUrl == r.Url {
+				r.pulled = true
+				return nil
+			}
 		}
 		if err != nil {
 			return fmt.Errorf("Cannot retrieve repo url for %v Error: %v", r.Path, err)
@@ -205,7 +213,7 @@ func (r *Repo) getMostRecentCommit() (string, error) {
 
 // getRepoUrl retrieves remote origin url for the git repository at path
 func (r *Repo) getRepoUrl() (string, error) {
-	_, err := os.Stat(r.Path)
+	_, err := gos.Stat(r.Path)
 	if err != nil {
 		return "", err
 	}
@@ -230,9 +238,9 @@ func (r *Repo) postPullCommand() error {
 	return err
 }
 
-// InitGit validates git installation and locates the git executable
-// binary in PATH
-func InitGit() error {
+// Init validates git installation, locates the git executable
+// binary in PATH and check for available shell to use.
+func Init() error {
 	// prevent concurrent call
 	initMutex.Lock()
 	defer initMutex.Unlock()
@@ -245,18 +253,30 @@ func InitGit() error {
 
 	// locate git binary in path
 	var err error
-	gitBinary, err = exec.LookPath("git")
-	return err
+	if gitBinary, err = gos.LookPath("git"); err != nil {
+		return fmt.Errorf("Git middleware requires git installed. Cannot find git binary in PATH")
+	}
+
+	// locate bash in PATH. If not found, fallback to sh.
+	// If neither is found, return error.
+	shell = "bash"
+	if _, err = gos.LookPath("bash"); err != nil {
+		shell = "sh"
+		if _, err = gos.LookPath("sh"); err != nil {
+			return fmt.Errorf("Git middleware requires either bash or sh.")
+		}
+	}
+	return nil
 }
 
 // runCmd is a helper function to run commands.
 // It runs command with args from directory at dir.
 // The executed process outputs to os.Stderr
 func runCmd(command string, args []string, dir string) error {
-	cmd := exec.Command(command, args...)
-	cmd.Stderr = os.Stderr
-	cmd.Stdout = os.Stderr
-	cmd.Dir = dir
+	cmd := gos.Command(command, args...)
+	cmd.Stdout(os.Stderr)
+	cmd.Stderr(os.Stderr)
+	cmd.Dir(dir)
 	if err := cmd.Start(); err != nil {
 		return err
 	}
@@ -267,8 +287,8 @@ func runCmd(command string, args []string, dir string) error {
 // It runs command with args from directory at dir.
 // If successful, returns output and nil error
 func runCmdOutput(command string, args []string, dir string) (string, error) {
-	cmd := exec.Command(command, args...)
-	cmd.Dir = dir
+	cmd := gos.Command(command, args...)
+	cmd.Dir(dir)
 	var err error
 	if output, err := cmd.Output(); err == nil {
 		return string(bytes.TrimSpace(output)), nil
@@ -279,8 +299,8 @@ func runCmdOutput(command string, args []string, dir string) (string, error) {
 // writeScriptFile writes content to a temporary file.
 // It changes the temporary file mode to executable and
 // closes it to prepare it for execution.
-func writeScriptFile(content []byte) (file *os.File, err error) {
-	if file, err = ioutil.TempFile("", "caddy"); err != nil {
+func writeScriptFile(content []byte) (file gitos.File, err error) {
+	if file, err = gos.TempFile("", "caddy"); err != nil {
 		return nil, err
 	}
 	if _, err = file.Write(content); err != nil {
@@ -293,8 +313,8 @@ func writeScriptFile(content []byte) (file *os.File, err error) {
 }
 
 // gitWrapperScript forms content for git.sh script
-var gitWrapperScript = func(gitBinary string) []byte {
-	return []byte(fmt.Sprintf(`#!/bin/bash
+func gitWrapperScript() []byte {
+	return []byte(fmt.Sprintf(`#!/bin/%v
 
 # The MIT License (MIT)
 # Copyright (c) 2013 Alvin Abad
@@ -323,17 +343,17 @@ fi
 # Run the git command
 %v "$@"
 
-`, gitBinary))
+`, shell, gitBinary))
 }
 
 // bashScript forms content of bash script to clone or update a repo using ssh
-var bashScript = func(gitShPath string, repo *Repo, params []string) []byte {
-	return []byte(fmt.Sprintf(`#!/bin/bash
+func bashScript(gitShPath string, repo *Repo, params []string) []byte {
+	return []byte(fmt.Sprintf(`#!/bin/%v
 
 mkdir -p ~/.ssh;
 touch ~/.ssh/known_hosts;
 ssh-keyscan -t rsa,dsa %v 2>&1 | sort -u - ~/.ssh/known_hosts > ~/.ssh/tmp_hosts;
 cat ~/.ssh/tmp_hosts >> ~/.ssh/known_hosts;
 %v -i %v %v;
-`, repo.Host, gitShPath, repo.KeyPath, strings.Join(params, " ")))
+`, shell, repo.Host, gitShPath, repo.KeyPath, strings.Join(params, " ")))
 }

middleware/git/git_test.go

+package git
+
+import (
+	"io/ioutil"
+	"log"
+	"testing"
+	"time"
+
+	"github.com/mholt/caddy/middleware/git/gittest"
+)
+
+// init sets the OS used to fakeOS.
+func init() {
+	SetOS(gittest.FakeOS)
+}
+
+func check(t *testing.T, err error) {
+	if err != nil {
+		t.Errorf("Error not expected but found %v", err)
+	}
+}
+
+func TestInit(t *testing.T) {
+	err := Init()
+	check(t, err)
+}
+
+func TestHelpers(t *testing.T) {
+	f, err := writeScriptFile([]byte("script"))
+	check(t, err)
+	var b [6]byte
+	_, err = f.Read(b[:])
+	check(t, err)
+	if string(b[:]) != "script" {
+		t.Errorf("Expected script found %v", string(b[:]))
+	}
+
+	out, err := runCmdOutput(gitBinary, []string{"-version"}, "")
+	check(t, err)
+	if out != gittest.CmdOutput {
+		t.Errorf("Expected %v found %v", gittest.CmdOutput, out)
+	}
+
+	err = runCmd(gitBinary, []string{"-version"}, "")
+	check(t, err)
+
+	wScript := gitWrapperScript()
+	if string(wScript) != expectedWrapperScript {
+		t.Errorf("Expected %v found %v", expectedWrapperScript, string(wScript))
+	}
+
+	f, err = writeScriptFile(wScript)
+	check(t, err)
+
+	repo := &Repo{Host: "github.com", KeyPath: "~/.key"}
+	script := string(bashScript(f.Name(), repo, []string{"clone", "git@github.com/repo/user"}))
+	if script != expectedBashScript {
+		t.Errorf("Expected %v found %v", expectedBashScript, script)
+	}
+}
+
+func TestGit(t *testing.T) {
+	// prepare
+	repos := []*Repo{
+		nil,
+		&Repo{Path: "gitdir", Url: "success.git"},
+	}
+	for _, r := range repos {
+		repo := createRepo(r)
+		err := repo.Prepare()
+		check(t, err)
+	}
+
+	// pull with success
+	logFile := gittest.Open("file")
+	Logger = log.New(logFile, "", 0)
+	tests := []struct {
+		repo   *Repo
+		output string
+	}{
+		{
+			&Repo{Path: "gitdir", Url: "git@github.com:user/repo.git", KeyPath: "~/.key", Then: "echo Hello"},
+			`git@github.com:user/repo.git pulled.
+Command echo Hello successful.
+`,
+		},
+		{
+			&Repo{Path: "gitdir", Url: "https://github.com/user/repo.git", Then: "echo Hello"},
+			`https://github.com/user/repo.git pulled.
+Command echo Hello successful.
+`,
+		},
+		{
+			&Repo{Url: "git@github.com:user/repo"},
+			`git@github.com:user/repo pulled.
+`,
+		},
+	}
+
+	for i, test := range tests {
+		gittest.CmdOutput = test.repo.Url
+
+		test.repo = createRepo(test.repo)
+
+		err := test.repo.Prepare()
+		check(t, err)
+
+		err = test.repo.Pull()
+		check(t, err)
+
+		out, err := ioutil.ReadAll(logFile)
+		check(t, err)
+		if test.output != string(out) {
+			t.Errorf("Pull with Success %v: Expected %v found %v", i, test.output, string(out))
+		}
+	}
+
+	// pull with error
+	repos = []*Repo{
+		&Repo{Path: "gitdir", Url: "http://github.com:u/repo.git"},
+		&Repo{Path: "gitdir", Url: "https://github.com/user/repo.git", Then: "echo Hello"},
+		&Repo{Path: "gitdir"},
+		&Repo{Path: "gitdir", KeyPath: ".key"},
+	}
+
+	gittest.CmdOutput = "git@github.com:u1/repo.git"
+	for i, repo := range repos {
+		repo = createRepo(repo)
+
+		err := repo.Prepare()
+		if err == nil {
+			t.Errorf("Pull with Error %v: Error expected but not found %v", i, err)
+			continue
+		}
+
+		expected := "Another git repo 'git@github.com:u1/repo.git' exists at gitdir"
+		if expected != err.Error() {
+			t.Errorf("Pull with Error %v: Expected %v found %v", i, expected, err.Error())
+		}
+	}
+
+}
+
+func createRepo(r *Repo) *Repo {
+	repo := &Repo{
+		Url:      "git@github.com/user/test",
+		Path:     ".",
+		Host:     "github.com",
+		Branch:   "master",
+		Interval: time.Second * 60,
+	}
+	if r == nil {
+		return repo
+	}
+	if r.Branch != "" {
+		repo.Branch = r.Branch
+	}
+	if r.Host != "" {
+		repo.Branch = r.Branch
+	}
+	if r.Interval != 0 {
+		repo.Interval = r.Interval
+	}
+	if r.KeyPath != "" {
+		repo.KeyPath = r.KeyPath
+	}
+	if r.Path != "" {
+		repo.Path = r.Path
+	}
+	if r.Then != "" {
+		repo.Then = r.Then
+	}
+	if r.Url != "" {
+		repo.Url = r.Url
+	}
+
+	return repo
+}
+
+var expectedBashScript = `#!/bin/bash
+
+mkdir -p ~/.ssh;
+touch ~/.ssh/known_hosts;
+ssh-keyscan -t rsa,dsa github.com 2>&1 | sort -u - ~/.ssh/known_hosts > ~/.ssh/tmp_hosts;
+cat ~/.ssh/tmp_hosts >> ~/.ssh/known_hosts;
+` + gittest.TempFileName + ` -i ~/.key clone git@github.com/repo/user;
+`
+
+var expectedWrapperScript = `#!/bin/bash
+
+# The MIT License (MIT)
+# Copyright (c) 2013 Alvin Abad
+
+if [ $# -eq 0 ]; then
+    echo "Git wrapper script that can specify an ssh-key file
+Usage:
+    git.sh -i ssh-key-file git-command
+    "
+    exit 1
+fi
+
+# remove temporary file on exit
+trap 'rm -f /tmp/.git_ssh.$$' 0
+
+if [ "$1" = "-i" ]; then
+    SSH_KEY=$2; shift; shift
+    echo "ssh -i $SSH_KEY \$@" > /tmp/.git_ssh.$$
+    chmod +x /tmp/.git_ssh.$$
+    export GIT_SSH=/tmp/.git_ssh.$$
+fi
+
+# in case the git command is repeated
+[ "$1" = "git" ] && shift
+
+# Run the git command
+/usr/bin/git "$@"
+
+`

middleware/git/gitos/gitos.go

+package gitos
+
+import (
+	"io"
+	"io/ioutil"
+	"os"
+	"os/exec"
+)
+
+// File is an abstraction for file (os.File).
+type File interface {
+	// Name returns the name of the file
+	Name() string
+
+	// Stat returns the FileInfo structure describing file.
+	Stat() (os.FileInfo, error)
+
+	// Close closes the File, rendering it unusable for I/O.
+	Close() error
+
+	// Chmod changes the mode of the file.
+	Chmod(os.FileMode) error
+
+	// Read reads up to len(b) bytes from the File. It returns the number of
+	// bytes read and an error, if any.
+	Read([]byte) (int, error)
+
+	// Write writes len(b) bytes to the File. It returns the number of bytes
+	// written and an error, if any.
+	Write([]byte) (int, error)
+}
+
+// Cmd is an abstraction for external commands (os.Cmd).
+type Cmd interface {
+	// Run starts the specified command and waits for it to complete.
+	Run() error
+
+	// Start starts the specified command but does not wait for it to complete.
+	Start() error
+
+	// Wait waits for the command to exit. It must have been started by Start.
+	Wait() error
+
+	// Output runs the command and returns its standard output.
+	Output() ([]byte, error)
+
+	// Dir sets the working directory of the command.
+	Dir(string)
+
+	// Stdin sets the process's standard input.
+	Stdin(io.Reader)
+
+	// Stdout sets the process's standard output.
+	Stdout(io.Writer)
+
+	// Stderr sets the process's standard output.
+	Stderr(io.Writer)
+}
+
+// gitCmd represents external commands executed by git.
+type gitCmd struct {
+	*exec.Cmd
+}
+
+// Dir sets the working directory of the command.
+func (g *gitCmd) Dir(dir string) {
+	g.Cmd.Dir = dir
+}
+
+// Stdin sets the process's standard input.
+func (g *gitCmd) Stdin(stdin io.Reader) {
+	g.Cmd.Stdin = stdin
+}
+
+// Stdout sets the process's standard output.
+func (g *gitCmd) Stdout(stdout io.Writer) {
+	g.Cmd.Stdout = stdout
+}
+
+// Stderr sets the process's standard output.
+func (g *gitCmd) Stderr(stderr io.Writer) {
+	g.Cmd.Stderr = stderr
+}
+
+// OS is an abstraction for required OS level functions.
+type OS interface {
+	// Command returns the Cmd to execute the named program with the
+	// given arguments.
+	Command(string, ...string) Cmd
+
+	// Mkdir creates a new directory with the specified name and permission
+	// bits.
+	Mkdir(string, os.FileMode) error
+
+	// MkdirAll creates a directory named path, along with any necessary
+	// parents.
+	MkdirAll(string, os.FileMode) error
+
+	// Stat returns a FileInfo describing the named file.
+	Stat(string) (os.FileInfo, error)
+
+	// Remove removes the named file or directory.
+	Remove(string) error
+
+	// ReadDir reads the directory named by dirname and returns a list of
+	// directory entries.
+	ReadDir(string) ([]os.FileInfo, error)
+
+	// LookPath searches for an executable binary named file in the directories
+	// named by the PATH environment variable.
+	LookPath(string) (string, error)
+
+	// TempFile creates a new temporary file in the directory dir with a name
+	// beginning with prefix, opens the file for reading and writing, and
+	// returns the resulting File.
+	TempFile(string, string) (File, error)
+}
+
+// GitOS is the implementation of OS for git.
+type GitOS struct{}
+
+// Mkdir calls os.Mkdir.
+func (g GitOS) Mkdir(name string, perm os.FileMode) error {
+	return os.Mkdir(name, perm)
+}
+
+// MkdirAll calls os.MkdirAll.
+func (g GitOS) MkdirAll(path string, perm os.FileMode) error {
+	return os.MkdirAll(path, perm)
+}
+
+// Stat calls os.Stat.
+func (g GitOS) Stat(name string) (os.FileInfo, error) {
+	return os.Stat(name)
+}
+
+// Remove calls os.Remove.
+func (g GitOS) Remove(name string) error {
+	return os.Remove(name)
+}
+
+// LookPath calls exec.LookPath.
+func (g GitOS) LookPath(file string) (string, error) {
+	return exec.LookPath(file)
+}
+
+// TempFile calls ioutil.TempFile.
+func (g GitOS) TempFile(dir, prefix string) (File, error) {
+	return ioutil.TempFile(dir, prefix)
+}
+
+// ReadDir calls ioutil.ReadDir.
+func (g GitOS) ReadDir(dirname string) ([]os.FileInfo, error) {
+	return ioutil.ReadDir(dirname)
+}
+
+// Command calls exec.Command.
+func (g GitOS) Command(name string, args ...string) Cmd {
+	return &gitCmd{exec.Command(name, args...)}
+}

middleware/git/gittest/gittest.go

+// Package gittest is a test package for the git middleware.
+// It implements a mock gitos.OS, gitos.Cmd and gitos.File.
+package gittest
+
+import (
+	"io"
+	"os"
+	"time"
+
+	"github.com/mholt/caddy/middleware/git/gitos"
+)
+
+// FakeOS implements a mock gitos.OS, gitos.Cmd and gitos.File.
+var FakeOS = fakeOS{}
+
+// CmdOutput is the output of any call to the mocked gitos.Cmd's Output().
+var CmdOutput = "success"
+
+// TempFileName is the name of any file returned by mocked gitos.OS's TempFile().
+var TempFileName = "tempfile"
+
+// dirs mocks a fake git dir if filename is "gitdir".
+var dirs = map[string][]os.FileInfo{
+	"gitdir": {
+		fakeInfo{name: ".git", dir: true},
+	},
+}
+
+// Open creates a new mock gitos.File.
+func Open(name string) gitos.File {
+	return &fakeFile{name: name}
+}
+
+// fakeFile is a mock gitos.File.
+type fakeFile struct {
+	name    string
+	dir     bool
+	content []byte
+	info    fakeInfo
+}
+
+func (f fakeFile) Name() string {
+	return f.name
+}
+
+func (f fakeFile) Stat() (os.FileInfo, error) {
+	return fakeInfo{name: f.name}, nil
+}
+
+func (f fakeFile) Close() error {
+	return nil
+}
+
+func (f fakeFile) Chmod(mode os.FileMode) error {
+	f.info.mode = mode
+	return nil
+}
+
+func (f *fakeFile) Read(b []byte) (int, error) {
+	if len(f.content) == 0 {
+		return 0, io.EOF
+	}
+	n := copy(b, f.content)
+	f.content = f.content[n:]
+	return n, nil
+}
+
+func (f *fakeFile) Write(b []byte) (int, error) {
+	f.content = append(f.content, b...)
+	return len(b), nil
+}
+
+// fakeCmd is a mock git.Cmd.
+type fakeCmd struct{}
+
+func (f fakeCmd) Run() error {
+	return nil
+}
+
+func (f fakeCmd) Start() error {
+	return nil
+}
+
+func (f fakeCmd) Wait() error {
+	return nil
+}
+
+func (f fakeCmd) Output() ([]byte, error) {
+	return []byte(CmdOutput), nil
+}
+
+func (f fakeCmd) Dir(dir string) {}
+
+func (f fakeCmd) Stdin(stdin io.Reader) {}
+
+func (f fakeCmd) Stdout(stdout io.Writer) {}
+
+func (f fakeCmd) Stderr(stderr io.Writer) {}
+
+// fakeInfo is a mock os.FileInfo.
+type fakeInfo struct {
+	name string
+	dir  bool
+	mode os.FileMode
+}
+
+func (f fakeInfo) Name() string {
+	return f.name
+}
+
+func (f fakeInfo) Size() int64 {
+	return 1024
+}
+
+func (f fakeInfo) Mode() os.FileMode {
+	return f.mode
+}
+
+func (f fakeInfo) ModTime() time.Time {
+	return time.Now().Truncate(time.Hour)
+}
+
+func (f fakeInfo) IsDir() bool {
+	return f.dir
+}
+
+func (f fakeInfo) Sys() interface{} {
+	return nil
+}
+
+// fakeOS is a mock git.OS.
+type fakeOS struct{}
+
+func (f fakeOS) Mkdir(name string, perm os.FileMode) error {
+	return nil
+}
+
+func (f fakeOS) MkdirAll(path string, perm os.FileMode) error {
+	return nil
+}
+
+func (f fakeOS) Stat(name string) (os.FileInfo, error) {
+	return fakeInfo{name: name}, nil
+}
+
+func (f fakeOS) Remove(name string) error {
+	return nil
+}
+
+func (f fakeOS) LookPath(file string) (string, error) {
+	return "/usr/bin/" + file, nil
+}
+
+func (f fakeOS) TempFile(dir, prefix string) (gitos.File, error) {
+	return &fakeFile{name: TempFileName, info: fakeInfo{name: TempFileName}}, nil
+}
+
+func (f fakeOS) ReadDir(dirname string) ([]os.FileInfo, error) {
+	if f, ok := dirs[dirname]; ok {
+		return f, nil
+	}
+	return nil, nil
+}
+
+func (f fakeOS) Command(name string, args ...string) gitos.Cmd {
+	return fakeCmd{}
+}

middleware/git/os.go

+package git
+
+import "github.com/mholt/caddy/middleware/git/gitos"
+
+// gos is the OS used by git.
+var gos gitos.OS = gitos.GitOS{}
+
+// SetOS sets the OS to be used. Intended to be used for tests
+// to abstract OS level git actions.
+func SetOS(os gitos.OS) {
+	gos = os
+}

middleware/rewrite/rewrite_test.go

@@ -28,6 +28,7 @@ func TestRewrite(t *testing.T) {
 		[]string{"/abc/", "ab", "/abc/{file}", ".html|"},
 		[]string{"/abcd/", "ab", "/a/{dir}/{file}", ".html|"},
 		[]string{"/abcde/", "ab", "/a#{frag}", ".html|"},
+		[]string{"/ab/", `.*\.jpg`, "/ajpg", ""},
 	}
 
 	for _, regexpRule := range regexpRules {
@@ -76,6 +77,7 @@ func TestRewrite(t *testing.T) {
 		{"/abcd/abcd.html", "/a/abcd/abcd.html"},
 		{"/abcde/abcde.html", "/a"},
 		{"/abcde/abcde.html#1234", "/a#1234"},
+		{"/ab/ab.jpg", "/ajpg"},
 	}
 
 	for i, test := range tests {