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#!/bin/bash
# A LinHES development script to enter a chroot tree.
#########################################################################
# Configuration: #
#-----------------------------------------------------------------------#
chrootBaseDir='build_root' # basename of chroot tree. #
repoBaseDir='pkg_repo' # basename of package repository tree. #
toolsDir='LinHES-dev' # directory name of development tools. #
packageDir='LinHES-PKGBUILD' # package development directory. #
C_B='\e[1m' # set bold : comment out for no bold. #
#########################################################################
C_N='\e[0m' # back to normal text output. #
myDir=$(pwd) # initial working directory. #
ARCH=${0##*.} # pick off the architecture part. #
BROOT="$myDir/$chrootBaseDir.$ARCH" # chroot subdir for $ARCH #
#########################################################################
# Proceedures / Functions: #
#-----------------------------------------------------------------------#
# Acquire the lock and modify the value, use: V=$(Modify +|-)
Modify() { # $1 is + for up and - for down.
local LOCKFILE=.lock
local VALUFILE=.inst
( # Acquire the lock:
flock -e -w 2 200
[ -e $VALUFILE ] || echo 0 > $VALUFILE
VAL=$(cat $VALUFILE)
NEW=$(expr $VAL $1 1)
echo "$NEW" > $VALUFILE
echo "$NEW"
) 200>$LOCKFILE
}
#-----------------------------------------------------------------------#
# set the title bar for an xterm or Konsole.
title() { # args are the title
echo -en "\e]0;$@\a" # for xterm,
echo -en "\e]30;$@\a" # for Konsole.
}
#-----------------------------------------------------------------------#
# check if a filesystem/directory is already mounted & if not, mount it.
# ckMount -t <fstype> <mntDir>
# ckMount --bind <srcDir> <dstDir>
ckMount() { # $1= -t|--bind, $2= fstype|srcDir $3= mntDir|dstDir
grep -q /$BROOT/$3 /proc/mounts || {
[ -d "$3" ] || mkdir -p $3
echo -e "mounting ${C_B}$3${C_N}"
case $1 in
-t) mount $1 $2 $2 $3 ;;
--bind) mount $1 $myDir/$2 $3 ;;
esac
}
}
#-----------------------------------------------------------------------#
# if this is the last incident, unmount all.
cleanUp() { # no arguments
# mark the exit to normal operation:
title Normal
V=$(Modify -)
[ "$V" -ne "0" ] && exit 0
# unmount all:
local mnts1="data/$repoBaseDir data/$packageDir build_tools"
local mnts2="dev/pts sys proc"
for i in $mnts1 $mnts2 ; do
grep -q $BROOT/$i /proc/mounts && {
echo -e "unMounting ${C_B}$i${C_N}"
umount $BROOT/$i # >& /dev/null
}
done
}
#=======================================================================#
# make certain that the chroot contains some files:
copyIn() { # no arguments
local F=etc/resolv.conf
[ -e "$BROOT/$F" ] || cp -f /$F $F
[ -f etc/bashrc ] || {
local D="$myDir/$toolsDir/templates/etc"
cp -f $D/bashrc etc/
cp -f $D/kmdev.sh etc/profile.d/
cp -f $D/.bashrc root/
cp -f $D/.bash_profile root/
chmod 0755 root/.bashrc root/.bash_profile etc/profile.d/kmdev.sh
}
}
#########################################################################
# Prerequisites: #
#-----------------------------------------------------------------------#
# must be root:
[ $EUID -ne 0 ] && {
echo -e "${C_B}chroot needs root priv's.${C_N}" 1>&2
exit 1
}
# must have the chroot subdirectory:
[ -d $BROOT ] || {
echo -e "${C_B}$BROOT${C_N} directory not found!"
exit 2
}
# if building packages, needs $packageDir
if [ -d "$packageDir" ]; then
echo -e "Found ${C_B}$packageDir${C_N}"
else
printf "%s\n" "**********************************************************************"
printf "* %-66s *\n" "Could Not find $packageDir"
printf "* %-66s *\n" "If you wish to be able to build packages within the chroot, then"
printf "* %-66s *\n" "Please checkout the package repository into the current directory."
printf "* %-66s *\n" "Its located @ knoppmyth.net/mount/repository/${packageDir}.git"
printf "%s\n" "**********************************************************************"
fi
# change to the chroot subdirectory:
cd $BROOT || {
echo -e "Could NOT cd to ${C_B}$BROOT${C_N} !"
exit 3
}
#########################################################################
# Main: #
#-----------------------------------------------------------------------#
V=$(Modify +) # bump the instance count.
trap cleanUp 1 2 15 EXIT
ckMount -t proc proc
ckMount -t sysfs sys
ckMount -t devpts dev/pts
[ -e dev/random ] || mknod dev/random c 1 8
[ -e dev/urandom ] || mknod dev/urandom c 1 9
[ -e dev/tty ] || mknod dev/tty c 5 0
[ -e dev/ptmx ] || mknod dev/ptmx c 5 2
ckMount --bind $toolsDir/build_tools build_tools
ckMount --bind $packageDir data/$packageDir
ckMount --bind $repoBaseDir data/$repoBaseDir
copyIn
# change the titlebar to indicate chroot:
title "CHROOT : $ARCH"
# The actual chroot:
env -i TERM="$TERM" DISPLAY="$DISPLAY" /usr/sbin/chroot . /bin/bash --login
# Note: the unMounts take place within the 'cleanUp' proceedure.
#########################################################################
# End
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