3c3,8
< try_bind_umount() {
---
> temp_dirs=
> mount_points=
> 
> # Unmount all directories mounted by cross-shell and delete all temporary 
> # directories created by cross-shell
> unmount_all() {
5c10,25
<     while $ROOT_CMD umount $_shared_mounts_MOUNTPOINT 2>/dev/null; do :; done
---
>     
>     for _mount_point in $mount_points; do
>         
>         # If the mount point is still mounted
>         if fgrep -q "$_mount_point" < /etc/mtab; then
>             
>             # Unmount it
>             $ROOT_CMD umount "$_mount_point"
>         fi
>     done
>     
>     for _temp_dir in $temp_dirs; do
>         
>         # Remove the temp dir and any empty parent dirs
>         $ROOT_CMD rmdir -p "$_temp_dir" 2> /dev/null || :
>     done
10c30,39
<     fgrep -q $2 < /etc/mtab || $ROOT_CMD mount --bind $1 $2
---
>     _old_path=$1
>     _new_path=$2
>     
>     if ! fgrep -q $_new_path < /etc/mtab; then
>         $ROOT_CMD mount --bind $_old_path $_new_path
>     fi
>     
>     mount_points="$mount_points $_new_path"
>     trap unmount_all 0 INT QUIT KILL TERM
> }
12,13c41,62
<     _shared_mounts_MOUNTPOINT=$2
<     trap try_bind_umount 0 INT QUIT KILL TERM
---
> try_mount_repo() {
>     _chroot_path=$1
>     _local_rep=$2
>     
>     # Strip any meaningless trailing dots and slashes from the chroot path
>     _trimmed_chroot_path=$(echo "$_chroot_path" | sed 's|/\.\?$||')
>     
>     # If the local repo directory isn't already mounted
>     if ! fgrep -q "$_trimmed_chroot_path$_local_rep" < /etc/mtab; then
>         
>         # Make a mount dir within chroot and mount the local repo dir to it
>         $ROOT_CMD mkdir -p "$_trimmed_chroot_path$_local_rep"
>         $ROOT_CMD mount --bind "$_local_rep" "$_trimmed_chroot_path$_local_rep"
>         
>         # Add local repo to list of mount points and list of temp dirs
>         mount_points="$mount_points $_trimmed_chroot_path$_local_rep"
>         temp_dirs="$temp_dirs $_trimmed_chroot_path$_local_rep"
>         
>         # Call unmount_repos to clean up the local repos when the script is 
>         # exited or interrupted
>         trap unmount_all 0 INT QUIT KILL TERM
>     fi