create_btrfs_portage.sh

#/bin/sh
 
fallocate -l 500M /var/db/portage-loop
mkfs.btrfs /var/db/portage-loop
mv /usr/portage/distfiles /var/db
rm -rf /usr/portage
mkdir /usr/portage
 
mount -o noatime,loop,compress-force /var/db/portage-loop /usr/portage
mkdir /usr/portage/distfiles
mount --bind /var/db/distfiles /usr/portage/distfiles
 
echo '/var/db/portage-loop /usr/portage           btrfs loop,noatime,compress-force 0 2' >> /etc/fstab
echo '/var/db/distfiles    /usr/portage/distfiles none  bind                        0 0' >> /etc/fstab
 
cd /usr/portage
git init
git remote add origin https://github.com/gentoo/gentoo-portage-rsync-mirror.git
git pull --depth=1 origin master