From 60d13d63c435f1159b309128a9cac1639cc9e46f Mon Sep 17 00:00:00 2001
From: Michael Crosby <crosbymichael@gmail.com>
Date: Tue, 11 Sep 2018 10:36:00 -0400
Subject: [PATCH] Add optional install path

This allows users to consume the install functionality but also install
to other areas instead of the managed `/opt` dir.

```bash
> ctr install --path /usr/local
```

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
---
 cmd/ctr/commands/install/install.go |  7 +++++
 install.go                          | 41 ++++++++++++++++++-----------
 install_opts.go                     |  9 +++++++
 3 files changed, 42 insertions(+), 15 deletions(-)

diff --git a/cmd/ctr/commands/install/install.go b/cmd/ctr/commands/install/install.go
index 4113418fbf8b..e04fa926a2f0 100644
--- a/cmd/ctr/commands/install/install.go
+++ b/cmd/ctr/commands/install/install.go
@@ -37,6 +37,10 @@ var Command = cli.Command{
 			Name:  "replace,r",
 			Usage: "replace any binaries or libs in the opt directory",
 		},
+		cli.StringFlag{
+			Name:  "path",
+			Usage: "set an optional install path other than the managed opt directory",
+		},
 	},
 	Action: func(context *cli.Context) error {
 		client, ctx, cancel, err := commands.NewClient(context)
@@ -56,6 +60,9 @@ var Command = cli.Command{
 		if context.Bool("replace") {
 			opts = append(opts, containerd.WithInstallReplace)
 		}
+		if path := context.String("path"); path != "" {
+			opts = append(opts, containerd.WithInstallPath(path))
+		}
 		return client.Install(ctx, image, opts...)
 	},
 }
diff --git a/install.go b/install.go
index 2aa8b039469b..5e4c6a2c8d40 100644
--- a/install.go
+++ b/install.go
@@ -33,25 +33,14 @@ import (
 
 // Install a binary image into the opt service
 func (c *Client) Install(ctx context.Context, image Image, opts ...InstallOpts) error {
-	resp, err := c.IntrospectionService().Plugins(ctx, &introspectionapi.PluginsRequest{
-		Filters: []string{
-			"id==opt",
-		},
-	})
-	if err != nil {
-		return err
-	}
-	if len(resp.Plugins) != 1 {
-		return errors.New("opt service not enabled")
-	}
-	path := resp.Plugins[0].Exports["path"]
-	if path == "" {
-		return errors.New("opt path not exported")
-	}
 	var config InstallConfig
 	for _, o := range opts {
 		o(&config)
 	}
+	path, err := c.getInstallPath(ctx, config)
+	if err != nil {
+		return err
+	}
 	var (
 		cs       = image.ContentStore()
 		platform = platforms.Default()
@@ -89,3 +78,25 @@ func (c *Client) Install(ctx context.Context, image Image, opts ...InstallOpts)
 	}
 	return nil
 }
+
+func (c *Client) getInstallPath(ctx context.Context, config InstallConfig) (string, error) {
+	if config.Path != "" {
+		return config.Path, nil
+	}
+	resp, err := c.IntrospectionService().Plugins(ctx, &introspectionapi.PluginsRequest{
+		Filters: []string{
+			"id==opt",
+		},
+	})
+	if err != nil {
+		return "", err
+	}
+	if len(resp.Plugins) != 1 {
+		return "", errors.New("opt service not enabled")
+	}
+	path := resp.Plugins[0].Exports["path"]
+	if path == "" {
+		return "", errors.New("opt path not exported")
+	}
+	return path, nil
+}
diff --git a/install_opts.go b/install_opts.go
index b11e7f3d6d0f..b0c9213cb277 100644
--- a/install_opts.go
+++ b/install_opts.go
@@ -25,6 +25,8 @@ type InstallConfig struct {
 	Libs bool
 	// Replace will overwrite existing binaries or libs in the opt directory
 	Replace bool
+	// Path to install libs and binaries to
+	Path string
 }
 
 // WithInstallLibs installs libs from the image
@@ -36,3 +38,10 @@ func WithInstallLibs(c *InstallConfig) {
 func WithInstallReplace(c *InstallConfig) {
 	c.Replace = true
 }
+
+// WithInstallPath sets the optional install path
+func WithInstallPath(path string) InstallOpts {
+	return func(c *InstallConfig) {
+		c.Path = path
+	}
+}