CyberLeo.Net >> Repos - CDN/j.git/blob

1 #!/bin/sh

3 # http://wiki.cyberleo.net/wiki/CyberLeo/COPYRIGHT

5 # Need root beyond here

6 [ "$(id -u)" -eq 0 ] || exec sudo env J_BASE=${J_BASE} J_NAME=${J_NAME} J_USER=${J_USER} "${0}" "${@}"

8 meh() { printf " \033[1;32m*\033[0m %s%s\n" "${jname:+${jname}: }" "${*}"; }

9 omg() { printf " \033[1;33m*\033[0m %s%s\n" "${jname:+${jname}: }" "${*}"; }

10 wtf() { printf " \033[1;31m*\033[0m %s%s\n" "${jname:+${jname}: }" "${*}"; exit 1; }

11 pebkac() {

12 [ "${*}" ] && printf "%s\n\n" "${*}"

13 cat <<EOF

14 Usage:

15 <command> <name> [arguments]

16 list

17 ls list available chroots

19 status show jail status

21 start prepare an existing chroot for use

23 stop undo what 'start' did

25 enter

26 shell spawn a shell or command within the chroot

28 eval evaluate a shell command line within the chroot

30 EOF

31 exit 1

32 }

34 cmd="$(basename "${0}")"

35 jbase="${J_BASE:-$(realpath "$(dirname "${0}")/../")}"

36 jname="${J_NAME:-$(basename "${1}")}" #"

37 juser="${J_USER}"

39 # Remove jail name from argument stack, if passed in

40 [ "${J_NAME}" ] || shift

42 # Propagate certain environment variables; sterilize the rest of the environment

43 jenv="

44 LANG=${LANG}

45 TERM=${TERM}

46 USER=${USER}

47 "

49 # Create a new chroot, somehow

50 j_init() {

51 # Either a debian jail with debootstrap or a gentoo jail with stage3 + portage tarballs

52 DEBOOTSTRAP_DIR="$(base)/debootstrap" "${DEBOOTSTRAP_DIR}/debootstrap" --arch=amd64 squeeze "${jdir}"

53 }

55 # Figure out and set jail parameters; needed for all functions that follow

56 j_params() {

57 jname="${1:-jname}"

58 # Given a jail name, find and set up the jail dir

59 jdir="${jbase}/${jname}"

60 [ -d "${jdir}" ] || wtf "not a directory"

62 # Where is the shell?

63 for shell in /bin/bash /usr/bin/bash /usr/local/bin/bash /bin/sh

64 do

65 if [ -f "${jdir}/${shell}" ]

66 then

67 jshell=${shell}

68 break

69 fi

70 wtf "cannot locate usable shell; is this a real jail?"

71 done

72 }

74 # Jail is 'up' if /dev/pts and /proc are mounted

75 j_up() {

76 grep -q "^devpts ${jdir}/dev/pts devpts" /proc/mounts || return 1

77 grep -q "^proc ${jdir}/proc proc" /proc/mounts || return 1

78 return 0

79 }

81 j_status() {

82 j_up && meh "$(printf '\033[1;32mup\033[0m')" || meh "$(printf '\033[1;31mdown\033[0m')"

83 }

85 # Mount /dev/pts and /proc in the chroot

86 j_start() {

87 j_up && return 0

88 meh "starting ${jail} ..."

89 mount -t devpts devpts "${jdir}/dev/pts"

90 mount -t proc proc "${jdir}/proc"

91 }

93 # Execute command in chroot

94 j_eval() {

95 j_up || wtf "jail not up"

96 meh "entering ${jail} ..."

97 env -i ${jenv} /usr/bin/chroot "${jdir}" /bin/su "${juser:-${USER}}" -c "${*}"

98 }

100 j_shell() {

101 j_eval "${jshell} -l"

102 }

103

104 # Unmount /dev/pts and /proc in the chroot

105 j_stop() {

106 j_up || return 0

107 meh "stopping ${jail} ..."

108 umount "${jdir}/proc"

109 umount "${jdir}/dev/pts"

110 }

111

112 # Populate jvars

113 j_params "${jname}"

114

115 case "${cmd}" in

116 status) j_status ;;

117 start) j_start ;;

118 shell|enter) j_shell ;;

119 eval) j_eval "${*}" ;;

120 stop) j_stop ;;

121 *) pebkac ;;

122 esac