Overlay fs mount xbps

this use to mount to dir in one dir

\$ sudo mount -t overlay overlay -o lowerdir=/opt/xbps-src/void-packages:/opt/xbps-src/ayoub,upperdir=/opt/xbps-src/xbps-up,workdir=/opt/xbps-src/xbps-work /opt/xbps-src/xbps-merg

mount pkg for void-packages

• don't use ln or ln -s
• use mount --bind:

\$ mkdir /path/to/new/dir
\$ mount --bind /path/to/dir /path/to/new/dir

fix mounted directory

some shared library not word in tmpfs/shm, I should remount with permission to exec

mount --bind /path/to/dir /new/dir
mount -o remount,exec,bind  /new/dir