Touch up XDG, add rootless links

Touch up a number of formating issues for XDG_RUNTIME_DIRS in a number
of man pages.  Make use of the XDG_CONFIG_HOME environment variable
in a rootless environment if available, or set it if not.

Also added a number of links to the Rootless Podman config page and
added the location of the auth.json files to that doc.

Signed-off-by: TomSweeneyRedHat <tsweeney@redhat.com>

20 files changed, 104 insertions, 24 deletions

diff --git a/README.md b/README.md
index e22c35d4f..f1d53cc11 100644
--- a/README.md
+++ b/README.md
@@ -41,6 +41,8 @@ If you run Podman as your user and mount in `/etc/passwd` from the host, you sti
 Almost all normal Podman functionality is available, though there are some [shortcomings](https://github.com/containers/libpod/blob/master/rootless.md).
 Any recent Podman release should be able to run rootless without any additional configuration, though your operating system may require some additional configuration detailed in the [install guide](https://github.com/containers/libpod/blob/master/install.md).
 
+A little configuration by an administrator is required before rootless Podman can be used, the necessary setup is documented [here](https://github.com/containers/libpod/blob/master/docs/tutorials/rootless_tutorial.md).
+
 ## Out of scope
 
 * Specializing in signing and pushing images to various storage backends.
@@ -101,6 +103,9 @@ Tutorials on using Podman.
 **[Remote Client](remote_client.md)**
 A brief how-to on using the Podman remote-client.
 
+**[Basic Setup and Use of Podman in a Rootless environment](https://github.com/containers/libpod/blob/master/docs/tutorials/rootless_tutorial.md)
+A tutorial showing the setup and configuration necessary to run Rootless Podman.
+
 **[Release Notes](RELEASE_NOTES.md)**
 Release notes for recent Podman versions
 
diff --git a/cmd/podman/main.go b/cmd/podman/main.go
index 72d1754ac..f24c8c19c 100644
--- a/cmd/podman/main.go
+++ b/cmd/podman/main.go
@@ -101,7 +101,7 @@ func initConfig() {
 }
 
 func before(cmd *cobra.Command, args []string) error {
-	if err := libpod.SetXdgRuntimeDir(); err != nil {
+	if err := libpod.SetXdgDirs(); err != nil {
 		logrus.Errorf(err.Error())
 		os.Exit(1)
 	}
diff --git a/cmd/podman/main_local.go b/cmd/podman/main_local.go
index e4f521bc4..1e8cc1143 100644
--- a/cmd/podman/main_local.go
+++ b/cmd/podman/main_local.go
@@ -121,6 +121,7 @@ func setupRootless(cmd *cobra.Command, args []string) error {
 	if os.Geteuid() == 0 || cmd == _searchCommand || cmd == _versionCommand || cmd == _mountCommand || cmd == _migrateCommand || strings.HasPrefix(cmd.Use, "help") {
 		return nil
 	}
+
 	podmanCmd := cliconfig.PodmanCommand{
 		Command:     cmd,
 		InputArgs:   args,
diff --git a/cmd/podman/main_remote.go b/cmd/podman/main_remote.go
index ecbb44d5a..d534f5bcb 100644
--- a/cmd/podman/main_remote.go
+++ b/cmd/podman/main_remote.go
@@ -8,7 +8,8 @@ import (
 	"os/user"
 	"path/filepath"
 
-	"github.com/docker/docker/pkg/homedir"
+	"github.com/containers/libpod/pkg/util"
+	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 )
@@ -31,9 +32,19 @@ func init() {
 }
 
 func setSyslog() error {
+	var err error
+	cfgHomeDir := os.Getenv("XDG_CONFIG_HOME")
+	if cfgHomeDir == "" {
+		if cfgHomeDir, err = util.GetRootlessConfigHomeDir(); err != nil {
+			return err
+		}
+		if err = os.Setenv("XDG_CONFIG_HOME", cfgHomeDir); err != nil {
+			return errors.Wrapf(err, "cannot set XDG_CONFIG_HOME")
+		}
+	}
+	path := filepath.Join(cfgHomeDir, "containers")
+
 	// Log to file if not using syslog
-	homeDir := homedir.Get()
-	path := filepath.Join(homeDir, ".config", "containers")
 
 	if _, err := os.Stat(path); os.IsNotExist(err) {
 		if err := os.MkdirAll(path, 0750); err != nil {
diff --git a/cmd/podman/remoteclientconfig/config_linux.go b/cmd/podman/remoteclientconfig/config_linux.go
index b94941381..5d27f19f2 100644
--- a/cmd/podman/remoteclientconfig/config_linux.go
+++ b/cmd/podman/remoteclientconfig/config_linux.go
@@ -1,12 +1,17 @@
 package remoteclientconfig
 
 import (
+	"os"
 	"path/filepath"
 
 	"github.com/docker/docker/pkg/homedir"
 )
 
 func getConfigFilePath() string {
-	homeDir := homedir.Get()
-	return filepath.Join(homeDir, ".config", "containers", remoteConfigFileName)
+	path := os.Getenv("XDG_CONFIG_HOME")
+	if path == "" {
+		homeDir := homedir.Get()
+		path = filepath.Join(homeDir, ".config")
+	}
+	return filepath.Join(path, "containers", remoteConfigFileName)
 }
diff --git a/docs/podman-container-runlabel.1.md b/docs/podman-container-runlabel.1.md
index aabeb092d..9b74a3410 100644
--- a/docs/podman-container-runlabel.1.md
+++ b/docs/podman-container-runlabel.1.md
@@ -45,7 +45,7 @@ Any additional arguments will be appended to the command.
 ## OPTIONS:
 **--authfile**=*path*
 
-Path of the authentication file. Default is ${XDG_RUNTIME\_DIR}/containers/auth.json, which is set using `podman login`.
+Path of the authentication file. Default is ${XDG\_RUNTIME\_DIR}/containers/auth.json, which is set using `podman login`.
 If the authorization state is not found there, $HOME/.docker/config.json is checked, which is set using `docker login`. (Not available for remote commands)
 
 Note: You can also override the default path of the authentication file by setting the REGISTRY\_AUTH\_FILE
diff --git a/docs/podman-login.1.md b/docs/podman-login.1.md
index 9be67e5a4..9d368e9f2 100644
--- a/docs/podman-login.1.md
+++ b/docs/podman-login.1.md
@@ -11,7 +11,7 @@ podman\-login - Login to a container registry
 and password. **podman login** reads in the username and password from STDIN.
 The username and password can also be set using the **username** and **password** flags.
 The path of the authentication file can be specified by the user by setting the **authfile**
-flag. The default path used is **${XDG\_RUNTIME_DIR}/containers/auth.json**.
+flag. The default path used is **${XDG\_RUNTIME\_DIR}/containers/auth.json**.
 
 **podman [GLOBAL OPTIONS]**
 
@@ -35,7 +35,7 @@ Username for registry
 
 **--authfile**=*path*
 
-Path of the authentication file. Default is ${XDG_\RUNTIME\_DIR}/containers/auth.json (Not available for remote commands)
+Path of the authentication file. Default is ${XDG\_RUNTIME\_DIR}/containers/auth.json (Not available for remote commands)
 
 Note: You can also override the default path of the authentication file by setting the REGISTRY\_AUTH\_FILE
 environment variable. `export REGISTRY_AUTH_FILE=path`
diff --git a/docs/podman-logout.1.md b/docs/podman-logout.1.md
index 56d661309..01dc52ecd 100644
--- a/docs/podman-logout.1.md
+++ b/docs/podman-logout.1.md
@@ -9,7 +9,7 @@ podman\-logout - Logout of a container registry
 ## DESCRIPTION
 **podman logout** logs out of a specified registry server by deleting the cached credentials
 stored in the **auth.json** file. The path of the authentication file can be overridden by the user by setting the **authfile** flag.
-The default path used is **${XDG\_RUNTIME_DIR}/containers/auth.json**.
+The default path used is **${XDG\_RUNTIME\_DIR}/containers/auth.json**.
 All the cached credentials can be removed by setting the **all** flag.
 
 **podman [GLOBAL OPTIONS]**
@@ -22,7 +22,7 @@ All the cached credentials can be removed by setting the **all** flag.
 
 **--authfile**=*path*
 
-Path of the authentication file. Default is ${XDG_\RUNTIME\_DIR}/containers/auth.json (Not available for remote commands)
+Path of the authentication file. Default is ${XDG\_RUNTIME\_DIR}/containers/auth.json (Not available for remote commands)
 
 Note: You can also override the default path of the authentication file by setting the REGISTRY\_AUTH\_FILE
 environment variable. `export REGISTRY_AUTH_FILE=path`
diff --git a/docs/podman-play-kube.1.md b/docs/podman-play-kube.1.md
index 2fae09199..8b78c83d0 100644
--- a/docs/podman-play-kube.1.md
+++ b/docs/podman-play-kube.1.md
@@ -19,7 +19,7 @@ Note: HostPath volume types created by play kube will be given an SELinux privat
 
 **--authfile**=*path*
 
-Path of the authentication file. Default is ${XDG_RUNTIME\_DIR}/containers/auth.json, which is set using `podman login`.
+Path of the authentication file. Default is ${XDG\_RUNTIME\_DIR}/containers/auth.json, which is set using `podman login`.
 If the authorization state is not found there, $HOME/.docker/config.json is checked, which is set using `docker login`. (Not available for remote commands)
 
 Note: You can also override the default path of the authentication file by setting the REGISTRY\_AUTH\_FILE
diff --git a/docs/podman-pull.1.md b/docs/podman-pull.1.md
index 2d6d42959..8774075e1 100644
--- a/docs/podman-pull.1.md
+++ b/docs/podman-pull.1.md
@@ -53,7 +53,7 @@ Note: When using the all-tags flag, Podman will not iterate over the search regi
 
 **--authfile**=*path*
 
-Path of the authentication file. Default is ${XDG_RUNTIME\_DIR}/containers/auth.json, which is set using `podman login`.
+Path of the authentication file. Default is ${XDG\_RUNTIME\_DIR}/containers/auth.json, which is set using `podman login`.
 If the authorization state is not found there, $HOME/.docker/config.json is checked, which is set using `docker login`. (Not available for remote commands)
 
 Note: You can also override the default path of the authentication file by setting the REGISTRY\_AUTH\_FILE
diff --git a/docs/podman-push.1.md b/docs/podman-push.1.md
index 4ac901919..2058a432c 100644
--- a/docs/podman-push.1.md
+++ b/docs/podman-push.1.md
@@ -46,7 +46,7 @@ Image stored in local container/storage
 
 **--authfile**=*path*
 
-Path of the authentication file. Default is ${XDG_RUNTIME\_DIR}/containers/auth.json, which is set using `podman login`.
+Path of the authentication file. Default is ${XDG\_RUNTIME\_DIR}/containers/auth.json, which is set using `podman login`.
 If the authorization state is not found there, $HOME/.docker/config.json is checked, which is set using `docker login`. (Not available for remote commands)
 
 Note: You can also override the default path of the authentication file by setting the REGISTRY\_AUTH\_FILE
diff --git a/docs/podman-run.1.md b/docs/podman-run.1.md
index f5f44fad4..16c29168f 100644
--- a/docs/podman-run.1.md
+++ b/docs/podman-run.1.md
@@ -56,7 +56,7 @@ each of stdin, stdout, and stderr.
 
 **--authfile**[=*path*]
 
-Path of the authentication file. Default is ${XDG_\RUNTIME\_DIR}/containers/auth.json (Not available for remote commands)
+Path of the authentication file. Default is ${XDG\_RUNTIME\_DIR}/containers/auth.json (Not available for remote commands)
 
 Note: You can also override the default path of the authentication file by setting the REGISTRY\_AUTH\_FILE
 environment variable. `export REGISTRY_AUTH_FILE=path`
diff --git a/docs/podman-search.1.md b/docs/podman-search.1.md
index f0a696494..e50cc8c13 100644
--- a/docs/podman-search.1.md
+++ b/docs/podman-search.1.md
@@ -27,7 +27,7 @@ Note, searching without a search term will only work for registries that impleme
 
 **--authfile**=*path*
 
-Path of the authentication file. Default is ${XDG_\RUNTIME\_DIR}/containers/auth.json (Not available for remote commands)
+Path of the authentication file. Default is ${XDG\_RUNTIME\_DIR}/containers/auth.json (Not available for remote commands)
 
 Note: You can also override the default path of the authentication file by setting the REGISTRY\_AUTH\_FILE
 environment variable. `export REGISTRY_AUTH_FILE=path`
diff --git a/docs/tutorials/README.md b/docs/tutorials/README.md
index ad0c5ae88..925cfb970 100644
--- a/docs/tutorials/README.md
+++ b/docs/tutorials/README.md
@@ -7,3 +7,7 @@
 **[Introduction Tutorial](https://github.com/containers/libpod/tree/master/docs/tutorials/podman_tutorial.md)**
 
 Learn how to setup Podman and perform some basic commands with the utility.
+
+**[Basic Setup and Use of Podman in a Rootless environment.](https://github.com/containers/libpod/blob/master/docs/tutorials/rootless_tutorial.md).
+
+The steps required to setup rootless Podman are enumerated.
diff --git a/docs/tutorials/rootless_tutorial.md b/docs/tutorials/rootless_tutorial.md
index 553e8d297..9453e3855 100644
--- a/docs/tutorials/rootless_tutorial.md
+++ b/docs/tutorials/rootless_tutorial.md
@@ -76,7 +76,9 @@ Once the Administrator has completed the setup on the machine and then the confi
 
 ### User Configuration Files.
 
-The Podman configuration files for root reside in /etc/containers.  In the rootless environment they reside in ${HOME}/.config/containers and are owned by each individual user.  The user can modify these files as they wish.
+The Podman configuration files for root reside in /usr/share/containers with overrides in /etc/containers.  In the rootless environment they reside in ${XDG\_CONFIG\_HOME}/containers and are owned by each individual user.  The user can modify these files as they wish.
+
+The default authorization file used by the `podman login` and `podman logout` commands reside in ${XDG\_RUNTIME\_DIR}/containers/auth.json.
 
 ## More information
 
diff --git a/libpod/runtime.go b/libpod/runtime.go
index 28958e932..c900f2b8b 100644
--- a/libpod/runtime.go
+++ b/libpod/runtime.go
@@ -325,16 +325,19 @@ func defaultRuntimeConfig() (RuntimeConfig, error) {
 	}, nil
 }
 
-// SetXdgRuntimeDir ensures the XDG_RUNTIME_DIR env variable is set
-// containers/image uses XDG_RUNTIME_DIR to locate the auth file.
-// It internally calls EnableLinger() so that the user's processes are not
+// SetXdgDirs ensures the XDG_RUNTIME_DIR env and XDG_CONFIG_HOME variables are set.
+// containers/image uses XDG_RUNTIME_DIR to locate the auth file, XDG_CONFIG_HOME is
+// use for the libpod.conf configuration file.
+// SetXdgDirs internally calls EnableLinger() so that the user's processes are not
 // killed once the session is terminated.  EnableLinger() also attempts to
 // get the runtime directory when XDG_RUNTIME_DIR is not specified.
-func SetXdgRuntimeDir() error {
+// This function should only be called when running rootless.
+func SetXdgDirs() error {
 	if !rootless.IsRootless() {
 		return nil
 	}
 
+	// Setup XDG_RUNTIME_DIR
 	runtimeDir := os.Getenv("XDG_RUNTIME_DIR")
 
 	runtimeDirLinger, err := rootless.EnableLinger()
@@ -362,6 +365,16 @@ func SetXdgRuntimeDir() error {
 	if err := os.Setenv("XDG_RUNTIME_DIR", runtimeDir); err != nil {
 		return errors.Wrapf(err, "cannot set XDG_RUNTIME_DIR")
 	}
+
+	// Setup XDG_CONFIG_HOME
+	if cfgHomeDir := os.Getenv("XDG_CONFIG_HOME"); cfgHomeDir == "" {
+		if cfgHomeDir, err = util.GetRootlessConfigHomeDir(); err != nil {
+			return err
+		}
+		if err = os.Setenv("XDG_CONFIG_HOME", cfgHomeDir); err != nil {
+			return errors.Wrapf(err, "cannot set XDG_CONFIG_HOME")
+		}
+	}
 	return nil
 }
 
diff --git a/pkg/util/utils.go b/pkg/util/utils.go
index fba34a337..520e41438 100644
--- a/pkg/util/utils.go
+++ b/pkg/util/utils.go
@@ -239,8 +239,10 @@ func ParseIDMapping(mode namespaces.UsernsMode, UIDMapSlice, GIDMapSlice []strin
 }
 
 var (
-	rootlessRuntimeDirOnce sync.Once
-	rootlessRuntimeDir     string
+	rootlessConfigHomeDirOnce sync.Once
+	rootlessConfigHomeDir     string
+	rootlessRuntimeDirOnce    sync.Once
+	rootlessRuntimeDir        string
 )
 
 type tomlOptionsConfig struct {
diff --git a/pkg/util/utils_supported.go b/pkg/util/utils_supported.go
index af55689a6..3eac58dc6 100644
--- a/pkg/util/utils_supported.go
+++ b/pkg/util/utils_supported.go
@@ -65,6 +65,38 @@ func GetRootlessRuntimeDir() (string, error) {
 	return rootlessRuntimeDir, nil
 }
 
+// GetRootlessConfigHomeDir returns the config home directory when running as non root
+func GetRootlessConfigHomeDir() (string, error) {
+	var rootlessConfigHomeDirError error
+
+	rootlessConfigHomeDirOnce.Do(func() {
+		cfgHomeDir := os.Getenv("XDG_CONFIG_HOME")
+		if cfgHomeDir == "" {
+			home := os.Getenv("HOME")
+			resolvedHome, err := filepath.EvalSymlinks(home)
+			if err != nil {
+				rootlessConfigHomeDirError = errors.Wrapf(err, "cannot resolve %s", home)
+				return
+			}
+			tmpDir := filepath.Join(resolvedHome, ".config")
+			if err := os.MkdirAll(tmpDir, 0755); err != nil {
+				logrus.Errorf("unable to make temp dir %s", tmpDir)
+			}
+			st, err := os.Stat(tmpDir)
+			if err == nil && int(st.Sys().(*syscall.Stat_t).Uid) == os.Geteuid() && st.Mode().Perm() == 0755 {
+				cfgHomeDir = tmpDir
+			}
+		}
+		rootlessConfigHomeDir = cfgHomeDir
+	})
+
+	if rootlessConfigHomeDirError != nil {
+		return "", rootlessConfigHomeDirError
+	}
+
+	return rootlessConfigHomeDir, nil
+}
+
 // GetRootlessPauseProcessPidPath returns the path to the file that holds the pid for
 // the pause process
 func GetRootlessPauseProcessPidPath() (string, error) {
diff --git a/pkg/util/utils_windows.go b/pkg/util/utils_windows.go
index 635558bf7..e7b2a272e 100644
--- a/pkg/util/utils_windows.go
+++ b/pkg/util/utils_windows.go
@@ -27,3 +27,8 @@ func GetRootlessPauseProcessPidPath() (string, error) {
 func GetRootlessRuntimeDir() (string, error) {
 	return "", errors.New("this function is not implemented for windows")
 }
+
+// GetRootlessConfigHomeDir returns the config home directory when running as non root
+func GetRootlessConfigHomeDir() (string, error) {
+	return "", errors.New("this function is not implemented for windows")
+}
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 17b11fd58..03946cd09 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -172,8 +172,8 @@ github.com/docker/distribution/registry/storage/cache
 github.com/docker/distribution/registry/storage/cache/memory
 github.com/docker/distribution/metrics
 # github.com/docker/docker v0.7.3-0.20190309235953-33c3200e0d16
-github.com/docker/docker/pkg/homedir
 github.com/docker/docker/pkg/signal
+github.com/docker/docker/pkg/homedir
 github.com/docker/docker/oci/caps
 github.com/docker/docker/pkg/namesgenerator
 github.com/docker/docker/pkg/term