From 2fc6ff36522ad8385ace1630c8bab100f458caf5 Mon Sep 17 00:00:00 2001
From: Sam <sam.saffron@gmail.com>
Date: Fri, 27 Jun 2014 15:57:12 +1000
Subject: [PATCH] FEATURE: ./launcher enter <CONTAINER>

---
 .gitignore               |  2 ++
 bin/.gitkeep             |  0
 image/nsenter/Dockerfile |  5 +++++
 launcher                 | 30 ++++++++++++++++++++++++++++++
 4 files changed, 37 insertions(+)
 create mode 100644 bin/.gitkeep
 create mode 100644 image/nsenter/Dockerfile

diff --git a/.gitignore b/.gitignore
index 5497b2c..aa1d35f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,5 @@ shared/*
 *.swp
 containers/*
 cids/*
+bin/*
+image/nsenter/nsenter
diff --git a/bin/.gitkeep b/bin/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/image/nsenter/Dockerfile b/image/nsenter/Dockerfile
new file mode 100644
index 0000000..119e631
--- /dev/null
+++ b/image/nsenter/Dockerfile
@@ -0,0 +1,5 @@
+# NOTE build nsenter locally
+# see: https://github.com/jpetazzo/nsenter
+
+FROM busybox
+ADD nsenter /nsenter
diff --git a/launcher b/launcher
index 0006413..0ef7680 100755
--- a/launcher
+++ b/launcher
@@ -30,6 +30,7 @@ usage () {
   echo "    stop:       Stop a running container"
   echo "    restart:    Restart a container"
   echo "    destroy:    Stop and remove a container"
+  echo "    enter:      Use nsenter to enter a container"
   echo "    ssh:        Start a bash shell in a running container"
   echo "    logs:       Docker logs for container"
   echo "    mailtest:   Test the mail settings in a container"
@@ -360,6 +361,35 @@ case "$command" in
       exit 0
       ;;
 
+  enter)
+
+      if [ ! -e $cidfile ]
+         then
+           echo "No cid found"
+           exit 1
+      fi
+
+      if [ ! $UID -eq 0 ] ;
+        then
+        echo "enter command must run as root, will attempt to sudo"
+        echo
+      fi
+
+      if [ ! -e bin/nsenter ]
+        then
+          echo "Downloading nsenter"
+          $docker_path pull samsaffron/nsenter
+          ($docker_path run --rm samsaffron/nsenter cat /nsenter > bin/nsenter1) || exit 1
+          cp bin/nsenter1 bin/nsenter
+          chmod +x bin/nsenter
+      fi
+
+      PID=$($docker_path inspect --format {{.State.Pid}} `cat $cidfile`)
+      SHELL=/bin/bash sudo -E bin/nsenter --target $PID --mount --uts --ipc --net --pid
+
+      exit 0;
+      ;;
+
   ssh)
       if [ ! -e $cidfile ]
          then
-- 
2.25.1