fix symlink checks to use OS file mode, not git file mode

* Add mount point for disk persistence

* Use empty folder for both images

.travis.yml

@@ -12,7 +12,17 @@ script:
   - go test -v ./...
 
 after_success:
-  - printf 'FROM scratch\nADD gomodproxy /\nCMD ["/gomodproxy"]' > Dockerfile
+  - mkdir gomods
+  - printf 'FROM scratch\nADD gomodproxy /\nADD gomods /\nCMD ["/gomodproxy"]' > Dockerfile
+  - docker build -t "sixtlabs/gomodproxy-slim:latest" .
+  - echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
+  - docker push "sixtlabs/gomodproxy-slim:latest"
+  - if [ ! -z $TRAVIS_TAG ] ; then
+      TAG=$(echo $TRAVIS_TAG | sed 's/^v//');
+      docker tag sixtlabs/gomodproxy-slim:latest sixtlabs/gomodproxy-slim:$TAG;
+      docker push sixtlabs/gomodproxy-slim:$TAG;
+    fi
+  - printf 'FROM golang\nADD gomodproxy /\nADD gomods /\nCMD ["/gomodproxy"]' > Dockerfile
   - docker build -t "sixtlabs/gomodproxy:latest" .
   - echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
   - docker push "sixtlabs/gomodproxy:latest"

cmd/gomodproxy/main.go

@@ -132,14 +132,6 @@ func main() {
 	}
 	options = append(options, api.Log(logger))
 
-	for _, path := range vcsPaths {
-		kv := strings.SplitN(path, ":", 2)
-		if len(kv) != 2 {
-			log.Fatal("bad VCS syntax:", path)
-		}
-		options = append(options, api.CustomVCS(kv[0], kv[1]))
-	}
-
 	for _, path := range gitPaths {
 		kv := strings.SplitN(path, ":", 2)
 		if len(kv) != 2 {
@@ -148,6 +140,14 @@ func main() {
 		options = append(options, api.Git(kv[0], kv[1]))
 	}
 
+	for _, path := range vcsPaths {
+		kv := strings.SplitN(path, ":", 2)
+		if len(kv) != 2 {
+			log.Fatal("bad VCS syntax:", path)
+		}
+		options = append(options, api.CustomVCS(kv[0], kv[1]))
+	}
+
 	options = append(options,
 		api.VCSWorkers(*workers),
 		api.GitDir(*gitdir),

pkg/vcs/cmd.go

@@ -15,17 +15,37 @@ import (
 )
 
 type cmdVCS struct {
-	log    logger
-	module string
-	cmd    string
+	log           logger
+	module        string
+	moduleEncoded string
+	cmd           string
+}
+
+func encodeBangs(s string) string {
+	buf := []byte{}
+	for _, r := range s {
+		if 'A' <= r && r <= 'Z' {
+			buf = append(buf, '!', byte(r+'a'-'A'))
+		} else {
+			buf = append(buf, byte(r))
+		}
+	}
+	return string(buf)
 }
 
 func NewCommand(l logger, cmd string, module string) VCS {
-	return &cmdVCS{log: l, cmd: cmd, module: module}
+	return &cmdVCS{log: l, cmd: cmd, module: module, moduleEncoded: encodeBangs(module)}
 }
 
 func (c *cmdVCS) List(ctx context.Context) ([]Version, error) {
-	b, err := c.exec(ctx, "MODULE="+c.module, "ACTION=list", "VERSION=latest", "FILEPATH="+c.module+"/@v/list")
+	b, err := c.exec(ctx,
+		"MODULE="+c.module,
+		"MODULE_ENCODED="+c.moduleEncoded,
+		"ACTION=list",
+		"VERSION=latest",
+		"FILEPATH="+c.module+"/@v/list",
+		"FILEPATH_ENCODED="+c.moduleEncoded+"/@v/list",
+	)
 	if err != nil {
 		return nil, err
 	}
@@ -37,8 +57,14 @@ func (c *cmdVCS) List(ctx context.Context) ([]Version, error) {
 }
 
 func (c *cmdVCS) Timestamp(ctx context.Context, version Version) (time.Time, error) {
-	b, err := c.exec(ctx, "MODULE="+c.module, "ACTION=timestamp", "VERSION="+version.String(),
-		"FILEPATH="+c.module+"/@v/"+version.String()+".info")
+	b, err := c.exec(ctx,
+		"MODULE="+c.module,
+		"MODULE_ENCODED="+c.moduleEncoded,
+		"ACTION=timestamp",
+		"VERSION="+version.String(),
+		"FILEPATH="+c.module+"/@v/"+version.String()+".info",
+		"FILEPATH_ENCODED="+c.moduleEncoded+"/@v/"+version.String()+".info",
+	)
 	if err != nil {
 		return time.Time{}, err
 	}
@@ -59,8 +85,14 @@ func (c *cmdVCS) Timestamp(ctx context.Context, version Version) (time.Time, err
 }
 
 func (c *cmdVCS) Zip(ctx context.Context, version Version) (io.ReadCloser, error) {
-	b, err := c.exec(ctx, "MODULE="+c.module, "ACTION=zip", "VERSION="+version.String(),
-		"FILEPATH="+c.module+"/@v/"+version.String()+".zip")
+	b, err := c.exec(ctx,
+		"MODULE="+c.module,
+		"MODULE_ENCODED="+c.moduleEncoded,
+		"ACTION=zip",
+		"VERSION="+version.String(),
+		"FILEPATH="+c.module+"/@v/"+version.String()+".zip",
+		"FILEPATH_ENCODED="+c.moduleEncoded+"/@v/"+version.String()+".zip",
+	)
 	if err != nil {
 		return nil, err
 	}

pkg/vcs/git.go

@@ -163,7 +163,11 @@ func (g *gitVCS) Zip(ctx context.Context, version Version) (io.ReadCloser, error
 		if submodule(f.Name) {
 			continue
 		}
-		if !f.Mode.IsRegular() {
+		mode, err := f.Mode.ToOSFileMode()
+		if err != nil {
+			return nil, err
+		}
+		if !mode.IsRegular() {
 			continue
 		}
 		name := f.Name