mdw@git.distorted.org.uk Git - distorted-chroot/blob - bin/install-cross-tools

   1 #! /bin/sh -e
   2 ###
   3 ### Replace common tools in foreign chroots with native versions
   4 ###
   5 ### (c) 2018 Mark Wooding
   6 ###
   7
   8 ###----- Licensing notice ---------------------------------------------------
   9 ###
  10 ### This file is part of the distorted.org.uk chroot maintenance tools.
  11 ###
  12 ### distorted-chroot is free software: you can redistribute it and/or
  13 ### modify it under the terms of the GNU General Public License as
  14 ### published by the Free Software Foundation; either version 2 of the
  15 ### License, or (at your option) any later version.
  16 ###
  17 ### distorted-chroot is distributed in the hope that it will be useful,
  18 ### but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20 ### General Public License for more details.
  21 ###
  22 ### You should have received a copy of the GNU General Public License
  23 ### along with distorted-chroot.  If not, write to the Free Software
  24 ### Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  25 ### USA.
  26
  27 . state/config.sh # @@@config@@@
  28
  29 ## Parse the command-line.
  30 badp=nil
  31 case $# in 2) ;; *) badp=t ;; esac
  32 case $badp in t) echo >&2 "usage: $0 DIST ARCH"; exit 2 ;; esac
  33 d=$1 a=$2
  34
  35 ## Figure out of all the architecture names.
  36 mymulti=$(dpkg-architecture -a$TOOLSARCH -qDEB_HOST_MULTIARCH)
  37 gnuarch=$(dpkg-architecture -A$a -qDEB_TARGET_GNU_TYPE)
  38 qarch=nil qhost=nil
  39 for fa in $FOREIGN_ARCHS; do
  40   case $fa in
  41     "$a")
  42       eval qarch=\$${a}_QEMUARCH qhost=\$${a}_QEMUHOST
  43       break ;;
  44   esac
  45 done
  46 case $qarch,$qhost in
  47   nil,* | *,nil) echo >&2 "$0: not a foreign architecture"; exit 2 ;;
  48 esac
  49
  50 ## Make sure we have the tools we need.
  51 crossdir=/usr/local.schroot/cross/$d-$TOOLSARCH
  52 my_crossdir=$LOCAL/${crossdir#/usr/local.schroot/}
  53 qemudir=/usr/local.schroot/cross/$d-$qhost/QEMU
  54 my_qemudir=$LOCAL/${qemudir#/usr/local.schroot/}
  55 if ! [ -d $my_crossdir ]; then
  56   echo 2>&1 "$0: no tree for \`$d-$TOOLSARCH'"; exit 2
  57 fi
  58 if ! [ -d $my_qemudir ]; then
  59   echo 2>&1 "$0: no tree for \`$d-$qhost'"; exit 2
  60 fi
  61
  62 ## Open a session to the target chroot.
  63 sess=$(schroot -bcsource:$LVPREFIX$d-$a)
  64 root=/schroot/$sess/fs
  65
  66 ## Abuse `/mnt/' as a temporary staging area.  This saves us from clobbering
  67 ## the chroot with weird directories.
  68 schroot -uroot -rc$sess -- sh -ec '
  69         if ! mountpoint -q /mnt; then
  70           mount -ttmpfs -omode=700,uid=0,gid=0 private /mnt
  71         fi'
  72
  73 ## Work through all of the tools we're interested in, to decide what we need
  74 ## to do with it.  Make lists:
  75 ##
  76 ##   * `DIVERT.want' lists all of the filenames which need dpkg diversions to
  77 ##     prevent foreign versions of the tools from clobbering our native
  78 ##     versions.
  79 ##
  80 ##   * `LINK'.want' lists all of the paths which need symbolic links into the
  81 ##     cross-tools trees, together with the link destinations.
  82 { echo $qemudir/qemu-$qarch-static
  83   echo $crossdir/lib/$mymulti
  84   echo $crossdir/usr/lib/$mymulti
  85   echo $crossdir/usr/lib/gcc-cross
  86   find $my_crossdir $my_crossdir/TOOLCHAIN/$gnuarch \
  87        \( \(  -path "*/QEMU" -o -path "*/TOOLCHAIN" -o \
  88        -path "*/lib/$mymulti" -o \
  89        -path "*/lib/gcc-cross" \) -prune \) -o \
  90        \( ! -type d -print \)
  91 } | sed "s\a^$LOCAL/\a/usr/local.schroot/\a" | while read t; do
  92   case $t in
  93     $qemudir/*)
  94       s=/usr/bin/${t#$qemudir/} ;;
  95     $crossdir/TOOLCHAIN/$gnuarch/*)
  96       s=/usr/bin/${t#$crossdir/TOOLCHAIN/$gnuarch/} ;;
  97     *)
  98       s=${t#$crossdir} ;;
  99   esac
 100   if [ -L $t ]; then t=$(readlink $t); fi
 101   if [ -d $t ]; then act=LINK; else act=DIVERT; fi
 102   echo $act $s $t
 103 done >$root/mnt/ALL.want
 104 sed -n '/^DIVERT \(.*\) .*$/s//\1/p' $root/mnt/ALL.want | \
 105   sort >$root/mnt/DIVERT.want
 106 sed -n '/^\(DIVERT\|LINK\) /s///p' $root/mnt/ALL.want | \
 107   sort >$root/mnt/LINK.want
 108
 109 ## Make a list, `DIVERT.have', of paths which already have diversions, and a
 110 ## list `LINK.have' of symbolic links into the cross-tools trees.  The
 111 ## layouts of these files match the `.want' files we just made.
 112 schroot -uroot -rc$sess -- sh -ec '
 113         dpkg-divert --list |
 114           sed -n "/^diversion of \(.*\) to .* by install-cross-tools\$/s//\1/p" | \
 115           sort >/mnt/DIVERT.have
 116         { find / -xdev -lname "/usr/local.schroot/cross/*" -printf "%p %l\n"
 117           while read s _; do
 118             if ! [ -L "$s" ]; then continue; fi
 119             t=$(readlink $s)
 120             case $t in /usr/local.schroot/cross/*) continue ;; esac
 121             echo "$s $t"
 122           done </mnt/LINK.want >/dev/null
 123         } | sort >/mnt/LINK.have'
 124
 125 ## Add diversions for the paths which need one, but don't have one.  There's
 126 ## a hack here because the `--no-rename' option was required in the same
 127 ## version in which is was introduced, so there's no single incantation that
 128 ## will work across the boundary.
 129 schroot -uroot -rc$sess -- sh -ec '
 130         a=$1
 131
 132         if dpkg-divert >/dev/null 2>&1 --no-rename --help
 133         then no_rename=--no-rename
 134         else no_rename=
 135         fi
 136
 137         comm -13 /mnt/DIVERT.have /mnt/DIVERT.want | while read i; do
 138           dpkg-divert --package "install-cross-tools" $no_rename \
 139             --divert "$i.$a" --add "$i"
 140         done' - $a
 141
 142 ## Go through each diverted tool, and, if it hasn't been moved aside, then
 143 ## /link/ it across now.  If we rename it, then the chroot will stop working
 144 ## -- which is why we didn't allow `dpkg-divert' to do the rename.  We can
 145 ## tell a tool that hasn't been moved, because it's a symlink into one of the
 146 ## cross trees.
 147 while read i; do
 148   if [ -e $root$i ] && ! [ -e $root$i.$a ]; then
 149     if [ -L $root$i ]; then
 150       t=$(readlink $root$i)
 151       case $t in
 152         $crossdir/* | $qemudir/* | /usr/local.schroot/qemu/*) continue ;;
 153       esac
 154       if [ -L $crossdir$i ]; then
 155         u=$(readlink $crossdir$i)
 156         case $t in "$u") continue ;; esac
 157       fi
 158     fi
 159     echo >&2 "$0: preserve old $i"
 160     ln $root$i $root$i.$a
 161   fi
 162 done <$root/mnt/DIVERT.want
 163
 164 ## Update all of the symbolic links which are currently wrong: add links
 165 ## which are missing, delete ones which are obsolete, and update ones which
 166 ## have the wrong target.
 167 join -j1 -a1 -a2 -e- -o"0 1.2 2.2" \
 168      $root/mnt/LINK.have $root/mnt/LINK.want |
 169   while read s t0 t1; do
 170     case $t1 in
 171       "$t0")
 172         continue
 173         ;;
 174       -)
 175         echo >&2 "$0: remove obsolete link $s -> $t0"
 176         rm -f $root$s
 177         ;;
 178       *)
 179         case $s in */*) mkdir -p $root${s%/*} ;; esac
 180         rm -f $root$s.new
 181         ln -s $t1 $root$s.new
 182         echo >&2 "$0: link $s -> $t1"
 183         mv -T $root$s.new $root$s
 184         ;;
 185     esac
 186   done
 187
 188 ## Remove diversions from paths which don't need them any more.  Here it's
 189 ## safe to rename, because either the tool isn't there, in which case it
 190 ## obviously wasn't important, or it is, and `dpkg-divert' will atomically
 191 ## replace our link with the foreign version.
 192 schroot -uroot -rc$sess -- sh -ec '
 193         a=$1
 194         comm -23 /mnt/DIVERT.have /mnt/DIVERT.want | while read i; do
 195           dpkg-divert --package "install-cross-tools" --rename \
 196             --divert "$i.$a" --remove "$i"
 197         done' - $a
 198
 199 ## Close the session.
 200 schroot -ec$sess
 201
 202 ###----- That's all, folks --------------------------------------------------