sb-prehook

#!/bin/bash
# Copyright (c) Paul Tagliamonte <paultag@ubuntu.com>, 2012, under the terms
# and conditions of the Expat license.

echo "I: Pre-hook running."

SBUILD=/var/sbuild
VARIANT=$1
DIST=$2

sb-endsession $VARIANT $DIST

if [ ! -h $SBUILD/$DIST ]; then
    if [ -d $SBUILD/$DIST ]; then
        # If it's a directory, it's likely because of what's going on
        # below.
        sudo umount $SBUILD/$DIST 2>/dev/null
        sudo rm -rf $SBUILD/$DIST
    else
        # If for some reason, there's something there.
        rm -f $SBUILD/$DIST
    fi
    # Get into a consistant state.
    ln -s $SBUILD/$DIST.d/$DIST-default $SBUILD/$DIST
fi

if [ "x$SBUILD_DO_OVERLAY" != "x" ]; then
    if [ -h $SBUILD/$DIST.overlay.d ]; then
        if [ ! -d `readlink $SBUILD/$DIST.overlay.d` ]; then
            mkdir -p  `readlink $SBUILD/$DIST.overlay.d`
        fi
    fi
    if [ ! -d $SBUILD/$DIST.overlay.d/$DIST-$VARIANT ]; then
        echo "I: Making new overlay."
        mkdir -p $SBUILD/$DIST.overlay.d/$DIST-$VARIANT
        echo "I: Made overlay."
    fi
    echo "I: Shimming the old chroot out of the way. This will get gnarly."
    echo "I: You might need to auth..."
    rm -f $SBUILD/$DIST
    mkdir $SBUILD/$DIST
    echo "Mounting."
    sudo unionfs-fuse \
        -o cow,max_files=32768 \
        -o allow_other,use_ino,suid,dev,nonempty \
        "$SBUILD/$DIST.overlay.d/$DIST-$VARIANT=RW:$SBUILD/$DIST.d/$DIST-$VARIANT=RO" \
        $SBUILD/$DIST
    if [ $? -ne 0 ]; then
        echo "WARNING! UNGOOD RESULT!"
        exit 1
    fi
fi