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" ; \
  41     do
  42         if mount | grep -q "$node"
  43         then
  44             echo "Unmounting ${node} ..."
  45             if ! umount "$node"
  46             then
  47                 echo "Doing a lazy unmount for $node ..."
  48                 umount -l "$node"
  49             fi
  50         fi
  51     done
  52     unset -v node
  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="$(CDPATH='' cd -P -- /tools && pwd -P)"
  72 rootdir="${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 -- \
  80  "${rootdir}/dev"                    \
  81  "${rootdir}/dev/pts"                \
  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  "${rootdir}/var/cache/qi/packages"
  89
  90 echo "Mounting virtual file systems ..."
  91 mount -o bind /dev      "${rootdir}/dev"
  92 mount -t devpts devpts  "${rootdir}/dev/pts"
  93 mount -t proc proc      "${rootdir}/proc"
  94 mount -t sysfs sysfs    "${rootdir}/sys"
  95
  96 echo "Binding directories for archive/, patches/, recipes/, sources/, and packages/ ..."
  97 mount -o bind "${CWD}/archive" "${rootdir}/usr/src/qi/archive"
  98 mount -o bind "${CWD}/patches" "${rootdir}/usr/src/qi/patches"
  99 mount -o bind "${CWD}/recipes" "${rootdir}/usr/src/qi/recipes"
 100 mount -o bind "${CWD}/sources" "${rootdir}/usr/src/qi/sources"
 101 mount -o bind "${CWD}/packages" "${rootdir}/var/cache/qi/packages"
 102
 103 # Change reported architecture for an appropriate environment
 104 _machine_type=""
 105
 106 if file /tools/bin/busybox | grep -q "32-bit"
 107 then
 108     echo "Using the linux32 command to change the reported architecure ..."
 109     if command -v linux32 > /dev/null
 110     then
 111         _machine_type="linux32"
 112     else
 113         echo "    The linux32 command is not available in your system." 1>&2
 114         echo "The current architecture will be used for the environment: $(uname -m)" 1>&2
 115     fi
 116 fi
 117
 118 # Add trap for unmount the series, signalled or not
 119 trap 'echo ""; unmountSeries' EXIT HUP QUIT ABRT TERM
 120
 121 echo "Entering via chroot $rootdir ..."
 122 $_machine_type chroot "$rootdir" /tools/bin/env -i \
 123   PATH=/bin:/usr/bin:/sbin:/usr/sbin:/tools/bin:/opt/trinity/bin \
 124   SHELL=/bin/sh \
 125   HOME=/root \
 126   TERM=linux \
 127   HOSTNAME=dragora \
 128   LC_ALL=C \
 129   PKG_CONFIG=/usr/bin/pkgconf \
 130   PKG_CONFIG_PATH=/usr/local/lib/pkgconfig:/usr/local/share/pkgconfig:/usr/lib/pkgconfig:/usr/share/pkgconfig:/opt/trinity/lib/pkgconfig \
 131  /bin/sh -
 132