From 83998bbd5176a6944291acdeaed96b13d86bf987 Mon Sep 17 00:00:00 2001
From: CyberLeo <cyberleo@cyberleo.net>
Date: Thu, 28 Apr 2011 10:34:24 -0500
Subject: [PATCH] Init

---
 .gitignore |  0
 enter      | 88 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 88 insertions(+)
 create mode 100644 .gitignore
 create mode 100755 enter

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e69de29
diff --git a/enter b/enter
new file mode 100755
index 0000000..fa7e52e
--- /dev/null
+++ b/enter
@@ -0,0 +1,88 @@
+#!/bin/sh
+# Copyright 2011 CyberLeo, All Rights Reserved
+# http://wiki.cyberleo.net/wiki/CyberLeo/COPYRIGHT
+
+meh() { printf " \033[1;32m*\033[0m %s%s\n" "${jail:+${jail}: }" "${*}"; }
+omg() { printf " \033[1;33m*\033[0m %s%s\n" "${jail:+${jail}: }" "${*}"; }
+wtf() { printf " \033[1;31m*\033[0m %s%s\n" "${jail:+${jail}: }" "${*}"; exit 1; }
+
+pebkac() {
+  [ "${*}" ] && printf "%s\n\n" "${*}"
+  cat <<EOF
+Usage: <start|enter|stop> <jailname>
+EOF
+  exit 1
+}
+
+cmd="$(basename "${0}")"
+base="$(realpath "$(dirname "${0}")")"
+jail="$(basename "${1:-DebianChroot}")"
+jdir="${base}/${jail}"
+jail_shell=""
+
+# Propagate certain environment variables; sterilize the rest of the environment
+jail_env="
+  TERM=${TERM}
+  USER=${USER}
+"
+
+# Create a new jail (Will not work, since a new jail will not exist and will not pass the 'not a jail' check above)
+jail_new() {
+  DEBOOTSTRAP_DIR="$(base)/debootstrap" "${DEBOOTSTRAP_DIR}/debootstrap" --arch=amd64 squeeze "${jdir}"
+}
+
+# Figure out jail parameters
+jail_params() {
+  # Where is the shell?
+  for shell in /bin/bash /usr/bin/bash /usr/local/bin/bash /bin/sh
+  do
+    if [ -f "${jdir}/${shell}" ]
+    then
+      jail_shell=${shell}
+      break
+    fi
+    wtf "cannot locate usable shell; is this a real jail?"
+  done
+}
+
+# Jail is 'up' if /dev/pts and /proc are mounted
+jail_up() {
+  grep -q "^devpts ${jdir}/dev/pts devpts" /proc/mounts || return 1
+  grep -q "^proc ${jdir}/proc proc" /proc/mounts || return 1
+  return 0
+}
+
+# Mount /dev/pts and /proc in the jail
+jail_start() {
+  jail_up && return 0
+  meh "starting ${jail} ..."
+  mount -t devpts devpts "${jdir}/dev/pts"
+  mount -t proc proc "${jdir}/proc"
+}
+
+# Enter jail
+jail_enter() {
+  jail_up || wtf "jail not up"
+  meh "entering ${jail} ..."
+  env -i ${env} /usr/bin/chroot "${jdir}" /bin/su "${USER}" -c "${jail_shell}" -l
+}
+
+# Unmount /dev/pts and /proc in the jail
+jail_stop() {
+  jail_up || return 0
+  meh "stopping ${jail} ..."
+  umount "${jdir}/proc"
+  umount "${jdir}/dev/pts"
+}
+
+# Need root beyond here
+[ "$(id -u)" -eq 0 ] || exec sudo env ${env} "${0}" "${@}"
+
+jail_params
+
+case "${cmd}" in
+start) jail_start ;;
+enter) jail_enter ;;
+stop)  jail_stop  ;;
+*) pebkac ;;
+esac
-- 
2.42.0