From 5fb025824f630ac6770fe41ac28bf6fe79bfa893 Mon Sep 17 00:00:00 2001
From: Dave Tucker <dt@docker.com>
Date: Wed, 28 Jun 2017 17:10:24 +0100
Subject: [PATCH] getty: Make namespacing more obvious

Warn the user in the MOTD
Add "(ns: getty)" or "(ns: sshd)" to the PS1
Use `agetty` and `-a root` to ensure we get a login shell when insecure

Signed-off-by: Dave Tucker <dt@docker.com>
---
 pkg/getty/etc/motd                   | 5 ++++-
 pkg/getty/etc/profile.d/namespace.sh | 1 +
 pkg/getty/usr/bin/rungetty.sh        | 4 ++--
 pkg/sshd/etc/motd                    | 5 ++++-
 pkg/sshd/etc/profile.d/namespace.sh  | 1 +
 5 files changed, 12 insertions(+), 4 deletions(-)
 create mode 100644 pkg/getty/etc/profile.d/namespace.sh
 create mode 100644 pkg/sshd/etc/profile.d/namespace.sh

diff --git a/pkg/getty/etc/motd b/pkg/getty/etc/motd
index 8132011ca..2414d0d94 100644
--- a/pkg/getty/etc/motd
+++ b/pkg/getty/etc/motd
@@ -1 +1,4 @@
-Welcome to LinuxKit 
+Welcome to LinuxKit!
+
+NOTE: This system is namespaced.
+The namespace you are currently in may not be the root.
diff --git a/pkg/getty/etc/profile.d/namespace.sh b/pkg/getty/etc/profile.d/namespace.sh
new file mode 100644
index 000000000..db350f3fa
--- /dev/null
+++ b/pkg/getty/etc/profile.d/namespace.sh
@@ -0,0 +1 @@
+export PS1="(ns: getty) $PS1"
diff --git a/pkg/getty/usr/bin/rungetty.sh b/pkg/getty/usr/bin/rungetty.sh
index 164554db9..454c0d6e3 100755
--- a/pkg/getty/usr/bin/rungetty.sh
+++ b/pkg/getty/usr/bin/rungetty.sh
@@ -31,14 +31,14 @@ start_getty() {
 	# are we secure or insecure?
 	loginargs=
 	if [ "$INSECURE" == "true" ]; then
-		loginargs="-n -l /bin/sh"
+		loginargs="-a root"
 	fi
 
 	if ! grep -q -w "$tty" "$securetty"; then
 		echo "$tty" >> "$securetty"
 	fi
 	# respawn forever
-	infinite_loop setsid.getty -w /sbin/getty $loginargs $line $speed $tty $term &
+	infinite_loop setsid.getty -w /sbin/agetty $loginargs $line $speed $tty $term &
 }
 
 # check if we have /etc/getty.shadow
diff --git a/pkg/sshd/etc/motd b/pkg/sshd/etc/motd
index 8132011ca..2414d0d94 100644
--- a/pkg/sshd/etc/motd
+++ b/pkg/sshd/etc/motd
@@ -1 +1,4 @@
-Welcome to LinuxKit 
+Welcome to LinuxKit!
+
+NOTE: This system is namespaced.
+The namespace you are currently in may not be the root.
diff --git a/pkg/sshd/etc/profile.d/namespace.sh b/pkg/sshd/etc/profile.d/namespace.sh
new file mode 100644
index 000000000..45775ea08
--- /dev/null
+++ b/pkg/sshd/etc/profile.d/namespace.sh
@@ -0,0 +1 @@
+export PS1="(ns: sshd) $PS1"