fix_mountpoint.sh

#!/bin/bash

# boot2docker issue #581 proof of concept
# Przemysław Kamiński (exlee)

boot2docker=/usr/local/bin/boot2docker
mountfile=Mountfile
fix_dockermountpoint () {

    echo "Stopping boot2docker to add VirtualBox shares"
    boot2docker stop

    echo "Cleaning mountpoints"
    old_shares=$(VBoxManage showvminfo "boot2docker-vm" | grep 'b2d-' | sed -e "s/Name: '\([^']*\)'.*/\1/")
    for share in $old_shares; do true
        VBoxManage sharedfolder remove "boot2docker-vm" --name "$share"
    done

    delayed=""

    #I'm reading Mountfile for mounts
    for line in $(cat Mountfile); do

        mount=$(echo $line | sed -e 's/\([^:]*\).*/\1/')
        mountperms=$(echo $line | sed -e 's/.*:\(.*\):\(.*\)/uid=\1,gid=\2/')

        # Depends on greadlink - go get it with `brew install coreutils`
        # but this is only to get absolute path of directory - needed for VBoxManage
        full_path=$(greadlink -f $mount)

        # I'm generating unique ID for share, so that we can mount single directory using it
        # and also we can easily find it for cleanup (using b2d- prefix)
        id="b2d-$(uuidgen)"


        # Adding mountpoints in VBoxManage
        VBoxManage sharedfolder add "boot2docker-vm" --name "$id" --hostpath "$full_path"

        # We're delaying those commands for AFTER boot2docker is up again
        # this is super ugly, but for my defense, I'm not too proficient in Bash arrays and stuff :)
        delayed="$delayed $boot2docker ssh sudo mkdir -p $full_path;"
        delayed="$delayed $boot2docker ssh sudo mount -t vboxsf $id $full_path -o $mountperms;"

    done

    boot2docker start
    # We don't need it anymore and I'm too lame to solve it using other means :)
    boot2docker ssh sudo umount /Users

    echo "Executing delayed commands"
    # This is running previously delayed commands, go echo it if you want
    eval $delayed

}

# Helper, not used, the code is actually at the beginning at fix_dockermountpoint
# isolated, because I thought it might be used
clean_prior () {

    old_shares=$(VBoxManage showvminfo "boot2docker-vm" | grep 'b2d-' | sed -e "s/Name: '\([^']*\)'.*/\1/")
    boot2docker stop
    for share in $old_shares; do
                 VBoxManage sharedfolder remove "boot2docker-vm" --name "$share"
    done
    boot2docker start
}

fix_dockermountpoint

Mountfile

test_dir1:1000:1000
test_dir2:1001:1001
test_dir3:1002:1002