enter-chroot

   1 #! /bin/sh -
   2 # Copyright (c) 2016-2018 Matias Fonzo, <selk@dragora.org>.
   3 # Copyright (c) 2020-2022 Matias Fonzo, <selk@dragora.org>.
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at
   8 #
   9 #    http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 PROGRAM="${0##*/}"
  18
  19 # Exit immediately on any error
  20 set -e
  21
  22 # Override locale settings
  23 LC_ALL=C
  24 export LC_ALL
  25
  26 # Get physical working directory (absolute path)
  27 CWD="$(CDPATH='' cd -P -- "$(dirname -- "$0")" && pwd -P)" || exit $?
  28
  29 # Functions
  30 unmountSeries()
  31 {
  32     for node in "${rootdir}/usr/src/qi/archive" \
  33                 "${rootdir}/usr/src/qi/patches" \
  34                 "${rootdir}/usr/src/qi/recipes" \
  35                 "${rootdir}/usr/src/qi/sources" \
  36                 "${rootdir}/var/cache/qi/packages" \
  37                 "${rootdir}/sys" \
  38                 "${rootdir}/proc" \
  39                 "${rootdir}/dev/pts" \
  40                 "${rootdir}/dev/shm" \
  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     unset -v node
  54 }
  55
  56 # Autodetermine the path of /tools
  57
  58 if test ! -L /tools
  59 then
  60     echo "${PROGRAM}: cannot determine ${rootdir}: /tools does not exist as symlink" 1>&2
  61     exit 1
  62 fi
  63 if test -L /tools && test ! -e /tools
  64 then
  65     echo "${PROGRAM}: cannot access /tools: Dangling symlink" 1>&2
  66     exit 1
  67 fi
  68
  69 # Set canonical name to compose the root directory, removing
  70 # the last component from the path name "/tools"
  71
  72 rootdir="$(CDPATH='' cd -P -- /tools && pwd -P)"
  73 rootdir="${rootdir%/*}"
  74
  75 # Unmount directories and file systems before the next mounting
  76
  77 unmountSeries
  78
  79 # Create required directory for destination
  80 mkdir -p -- \
  81  "${rootdir}/dev"                    \
  82  "${rootdir}/dev/pts"                \
  83  "${rootdir}/dev/shm"                \
  84  "${rootdir}/proc"                   \
  85  "${rootdir}/sys"                    \
  86  "${rootdir}/usr/src/qi/archive"     \
  87  "${rootdir}/usr/src/qi/patches"     \
  88  "${rootdir}/usr/src/qi/recipes"     \
  89  "${rootdir}/usr/src/qi/sources"     \
  90  "${rootdir}/var/cache/qi/packages"
  91
  92 echo "Mounting virtual file systems ..."
  93 mount -o bind /dev      "${rootdir}/dev"
  94 mount -t devpts devpts  "${rootdir}/dev/pts"
  95 mount -t tmpfs devshm   "${rootdir}/dev/shm"
  96 mount -t proc proc      "${rootdir}/proc"
  97 mount -t sysfs sysfs    "${rootdir}/sys"
  98
  99 echo "Binding directories for archive/, patches/, recipes/, sources/, and packages/ ..."
 100 mount -o bind "${CWD}/archive" "${rootdir}/usr/src/qi/archive"
 101 mount -o bind "${CWD}/patches" "${rootdir}/usr/src/qi/patches"
 102 mount -o bind "${CWD}/recipes" "${rootdir}/usr/src/qi/recipes"
 103 mount -o bind "${CWD}/sources" "${rootdir}/usr/src/qi/sources"
 104 mount -o bind "${CWD}/packages" "${rootdir}/var/cache/qi/packages"
 105
 106 # Change reported architecture for an appropriate environment
 107 _machine_type=""
 108
 109 if file /tools/bin/busybox | grep -q "32-bit"
 110 then
 111     echo "Using the linux32 command to change the reported architecure ..."
 112     if command -v linux32 > /dev/null
 113     then
 114         _machine_type="linux32"
 115     else
 116         echo "    The linux32 command is not available in your system." 1>&2
 117         echo "The current architecture will be used for the environment: $(uname -m)" 1>&2
 118     fi
 119 fi
 120
 121 # Add trap for unmount the series, signalled or not
 122 trap 'echo ""; unmountSeries' EXIT HUP QUIT ABRT TERM
 123
 124 echo "Entering via chroot $rootdir ..."
 125 $_machine_type chroot "$rootdir" /tools/bin/env -i \
 126   PATH=/bin:/usr/bin:/sbin:/usr/sbin:/tools/bin:/opt/trinity/bin \
 127   SHELL=/bin/sh \
 128   HOME=/root \
 129   TERM=linux \
 130   HOSTNAME=dragora \
 131   LC_ALL=C \
 132   PKG_CONFIG=/usr/bin/pkgconf \
 133   PKG_CONFIG_PATH=/usr/local/lib/pkgconfig:/usr/local/share/pkgconfig:/usr/lib/pkgconfig:/usr/share/pkgconfig:/opt/trinity/lib/pkgconfig \
 134  /bin/sh -
 135