enter-chroot

   1 #! /bin/sh -
   2 # Copyright (c) 2016-2018 Matias Fonzo, <selk@dragora.org>.
   3 #
   4 # Licensed under the Apache License, Version 2.0 (the "License");
   5 # you may not use this file except in compliance with the License.
   6 # You may obtain a copy of the License at
   7 #
   8 #    http://www.apache.org/licenses/LICENSE-2.0
   9 #
  10 # Unless required by applicable law or agreed to in writing, software
  11 # distributed under the License is distributed on an "AS IS" BASIS,
  12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13 # See the License for the specific language governing permissions and
  14 # limitations under the License.
  15
  16 PROGRAM="${0##*/}"
  17
  18 # Exit immediately on any error
  19 set -e
  20
  21 # Override locale settings
  22 LC_ALL=C
  23 export LC_ALL
  24
  25 # Get physical working directory, absolute path name
  26 CWD=$(CDPATH= cd -P -- $(dirname -- "$0") && printf "$PWD")
  27
  28 # Functions
  29 unmountSeries()
  30 {
  31     for node in "${rootdir}/usr/src/qi/archive" \
  32                 "${rootdir}/usr/src/qi/patches" \
  33                 "${rootdir}/usr/src/qi/recipes" \
  34                 "${rootdir}/usr/src/qi/sources" \
  35                 "${rootdir}/sys" \
  36                 "${rootdir}/proc" \
  37                 "${rootdir}/dev/pts" \
  38                 "${rootdir}/dev" ; \
  39     do
  40         if mount | grep -q "$node"
  41         then
  42             echo "Unmounting ${node} ..."
  43             if ! umount "$node"
  44             then
  45                 echo "Doing a lazy unmount for $node ..."
  46                 umount -l "$node"
  47             fi
  48         fi
  49     done
  50 }
  51
  52 # Autodetermine the path of /tools
  53
  54 if test ! -L /tools
  55 then
  56     echo "${PROGRAM}: cannot determine ${rootdir}: /tools does not exist as symlink" 1>&2
  57     exit 1
  58 fi
  59 if test -L /tools -a ! -e /tools
  60 then
  61     echo "${PROGRAM}: cannot access /tools: Dangling symlink" 1>&2
  62     exit 1
  63 fi
  64
  65 # Set canonical name to compose the root directory, removing
  66 # the last component from the path name "/tools"
  67
  68 rootdir=$(CDPATH= cd -P -- /tools && printf "$PWD")
  69 rootdir="${rootdir%/*}"
  70
  71 # Unmount directories and file systems before the next mounting
  72
  73 unmountSeries
  74
  75 # Create required directory for destination
  76 mkdir -p -- "${rootdir}/dev"                 \
  77             "${rootdir}/dev/pts"             \
  78             "${rootdir}/proc"                \
  79             "${rootdir}/sys"                 \
  80             "${rootdir}/usr/src/qi/archive"  \
  81             "${rootdir}/usr/src/qi/patches"  \
  82             "${rootdir}/usr/src/qi/recipes"  \
  83             "${rootdir}/usr/src/qi/sources"
  84
  85 echo "Mounting virtual file systems ..."
  86 mount -o bind /dev      "${rootdir}/dev"
  87 mount -t devpts devpts  "${rootdir}/dev/pts"
  88 mount -t proc proc      "${rootdir}/proc"
  89 mount -t sysfs sysfs    "${rootdir}/sys"
  90
  91 echo "Binding directories to mount: archive, patches, recipes, sources ..."
  92 mount -o bind "${CWD}/archive" "${rootdir}/usr/src/qi/archive"
  93 mount -o bind "${CWD}/patches" "${rootdir}/usr/src/qi/patches"
  94 mount -o bind "${CWD}/recipes" "${rootdir}/usr/src/qi/recipes"
  95 mount -o bind "${CWD}/sources" "${rootdir}/usr/src/qi/sources"
  96
  97 # Add trap for unmount the series, signalled or not
  98 trap 'echo ; unmountSeries' EXIT HUP QUIT ABRT TERM
  99
 100 echo "Entering via chroot $rootdir ..."
 101 chroot "$rootdir" /tools/bin/env -i \
 102   PATH=/bin:/usr/bin:/sbin:/usr/sbin:/tools/bin \
 103   SHELL=/bin/sh \
 104   HOME=/root \
 105   TERM=linux \
 106   LC_ALL=C \
 107   LANGUAGE=C \
 108   PKG_CONFIG=/usr/bin/pkgconf \
 109   PKG_CONFIG_PATH=/usr/local/lib/pkgconfig:/usr/local/share/pkgconfig:/usr/lib/pkgconfig:/usr/share/pkgconfig \
 110  /bin/sh -
 111