enter-chroot

   1 #! /bin/sh -
   2 #
   3 #  Copyright (C) 2016, 2017 Matias Andres Fonzo <selk@dragora.org>
   4 #
   5 #  This program is free software: you can redistribute it and/or modify
   6 #  it under the terms of the GNU General Public License as published by
   7 #  the Free Software Foundation, either version 3 of the License, or
   8 #  (at your option) any later version.
   9 #
  10 #  This program is distributed in the hope that it will be useful,
  11 #  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 #  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 #  GNU General Public License for more details.
  14 #
  15 #  You should have received a copy of the GNU General Public License
  16 #  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 PROGRAM="${0##*/}"
  19
  20 # Exit immediately on any error
  21 set -e
  22
  23 # Override locale settings
  24 LC_ALL=C
  25 export LC_ALL
  26
  27 # Get physical working directory, absolute path name
  28 CWD=$(CDPATH= cd -P -- $(dirname -- "$0") && printf "$PWD")
  29
  30 # Functions
  31 unmountSeries()
  32 {
  33     for node in "${rootdir}/usr/src/qi/archive" \
  34                 "${rootdir}/usr/src/qi/patches" \
  35                 "${rootdir}/usr/src/qi/recipes" \
  36                 "${rootdir}/usr/src/qi/sources" \
  37                 "${rootdir}/sys" \
  38                 "${rootdir}/proc" \
  39                 "${rootdir}/dev/shm" \
  40                 "${rootdir}/dev/pts" \
  41                 "${rootdir}/dev" ; \
  42     do
  43         if mount | grep -q "$node"
  44         then
  45             echo "Unmounting ${node} ..."
  46             if ! umount "$node"
  47             then
  48                 echo "Doing a lazy unmount for $node ..."
  49                 umount -l "$node"
  50             fi
  51         fi
  52     done
  53 }
  54
  55 # Autodetermine the path of /tools
  56
  57 if test ! -L /tools
  58 then
  59     echo "${PROGRAM}: cannot determine ${rootdir}: /tools does not exist as symlink" 1>&2
  60     exit 1
  61 fi
  62 if test -L /tools -a ! -e /tools
  63 then
  64     echo "${PROGRAM}: cannot access /tools: Dangling symlink" 1>&2
  65     exit 1
  66 fi
  67
  68 # Set canonical name to compose the root directory, removing
  69 # the last component from the path name "/tools"
  70
  71 rootdir=$(CDPATH= cd -P -- /tools && printf "$PWD")
  72 rootdir="${rootdir%/*}"
  73
  74 # Unmount directories and file systems before the next mounting
  75
  76 unmountSeries
  77
  78 # Create required directory for destination
  79 mkdir -p -- "${rootdir}/dev"                 \
  80             "${rootdir}/dev/pts"             \
  81             "${rootdir}/dev/shm"             \
  82             "${rootdir}/proc"                \
  83             "${rootdir}/sys"                 \
  84             "${rootdir}/usr/src/qi/archive"  \
  85             "${rootdir}/usr/src/qi/patches"  \
  86             "${rootdir}/usr/src/qi/recipes"  \
  87             "${rootdir}/usr/src/qi/sources"
  88
  89 echo "Mounting virtual file systems ..."
  90 mount -o bind /dev      "${rootdir}/dev"
  91 mount -t devpts devpts  "${rootdir}/dev/pts"
  92 mount -t proc proc      "${rootdir}/proc"
  93 mount -t sysfs sysfs    "${rootdir}/sys"
  94
  95 if test -L /run/shm
  96 then
  97     mount -o bind "$(readlink /run/shm)" "${rootdir}/dev/shm" || true
  98 else
  99     mount -o bind /dev/shm "${rootdir}/dev/shm" || true
 100 fi
 101
 102 echo "Binding directories to mount: archive, patches, recipes, sources ..."
 103 mount -o bind "${CWD}/archive" "${rootdir}/usr/src/qi/archive"
 104 mount -o bind "${CWD}/patches" "${rootdir}/usr/src/qi/patches"
 105 mount -o bind "${CWD}/recipes" "${rootdir}/usr/src/qi/recipes"
 106 mount -o bind "${CWD}/sources" "${rootdir}/usr/src/qi/sources"
 107
 108 # Add trap for unmount the series, signalled or not
 109 trap 'echo ; unmountSeries' EXIT HUP QUIT ABRT TERM
 110
 111 echo "Entering via chroot $rootdir ..."
 112 chroot "$rootdir" /tools/bin/env -i \
 113   PATH=/bin:/usr/bin:/sbin:/usr/sbin:/tools/bin \
 114   SHELL=/bin/sh \
 115   HOME=/root \
 116   TERM="${TERM:-linux}" \
 117   LC_ALL=C \
 118   LANGUAGE=C \
 119   PKG_CONFIG=/usr/bin/pkgconf \
 120   PKG_CONFIG_PATH=/usr/local/lib/pkgconfig:/usr/local/share/pkgconfig:/usr/lib/pkgconfig:/usr/share/pkgconfig \
 121  /bin/sh -
 122