Table of Contents
This guide explain how to setup a chroot to cook packages in a separate environment. The chroot can be built on a USB or HDD device to save RAM when using a live session. There is also a script which removes any packages installed during cooking on exit in order to keep the chroot light and also checks the build_depends.
Over time the SliTaz developers created tools for the automation of various tasks. The slitaz-dev-tools package provides the tazdev utility and its configuration file /etc/slitaz/tazdev.conf; it can create a chroot to use:
# tazpkg get-install slitaz-dev-tools # tazdev gen-chroot # tazdev chroot
By default the chroot is created in /home/slitaz/cooking/chroot and is slitaz-based. For more info and available commands you can use 'tazdev usage' and/or take a look at the configuration file.
Create the chroot
#!/bin/sh mkdir /home/chroot # You can mount a device to /home/chroot # with mountbox or mount tazpkg get-install busybox --root="/home/chroot" echo "No" | tazpkg get-install bash --root="/home/chroot" tazpkg get-install slitaz-toolchain --root="/home/chroot" tazpkg get-install tazwok --root="/home/chroot" tazpkg get-install tazpkg --root="/home/chroot" tazpkg get-install lzma --root="/home/chroot" mkdir /home/chroot/home/slitaz
Note, you can keep these lines in a script file if needed. Just add #!/bin/sh to the first line and make executable with:
# chmod +x script_file
Add a script file to automate some actions
# cat > /home/chroot/chroot_script.sh << "EOF"
#!/bin/sh /bin/sh --login for pkg in $(cat /var/log/tazpkg.log | grep -v Removed | sed 's/\(.*\)\(- Installed - \)\(.*\)\( (.*\)/\3/'); do echo "y" | tazpkg remove $pkg done rm /var/log/tazpkg.log EOF
# chmod +x "/home/chroot/chroot_script.sh"
Note, /bin/sh –login logs you into the chrooted environment. The commands after that auto-remove any packages added when cooking on exit. You can hack this file to execute various automated actions when entering and exiting the chroot.
Add a script to mount and umount chroot
# cat > /usr/bin/tazchroot << "EOF"
#!/bin/sh cat /etc/resolv.conf > /home/chroot/etc/resolv.conf if [ ! -d "/home/chroot/proc/1" ]; then echo "Mounting virtual filesystems..." mount -t proc proc /home/chroot/proc mount -t sysfs sysfs /home/chroot/sys mount -t devpts devpts /home/chroot/dev/pts mount -t tmpfs shm /home/chroot/dev/shm mount /home/slitaz /home/chroot/home/slitaz chroot /home/chroot ./chroot_script.sh until [ "$ps" = "2" ]; do echo "Waiting for the end of all other chroot processes..." ps=$(ps | grep `basename $0` | grep -v grep | grep -v basename | wc -l) sleep 1 done umount /home/chroot/home/slitaz umount /home/chroot/dev/shm umount /home/chroot/dev/pts umount /home/chroot/sys umount /home/chroot/proc else echo "The chroot is already mounted" fi EOF
# chmod +x /usr/bin/tazchroot
Note, this script mounts /home/slitaz in your chroot, so you can use tazwok as if it was in your normal environment.
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