pkg_comp questions

[Mayuresh <mayuresh%acm.org@localhost>]

I am setting up pkg_comp for the first time and have a few questions:

I am primarily using the following tutorial.
https://www.unitedbsd.com/d/593-how-to-use-pkg-comp8-to-automate-package-builds-in-a-sandbox

After setting up and running first command, following happens:

pkg_comp -c local auto
pkg_comp: I: Command finished successfully
pkg_comp: W: Package shells/bash does not exist
pkg_comp: E: Some packages do not exist in pkgsrc; please fix and retry
localhost# pkg_comp -c local auto
pkg_comp: I: Updating pkgsrc tree
pkg_comp: I: Running 'cvs -d:ext:anoncvs%anoncvs.NetBSD.org@localhost:/cvsroot -q
update -d -P -rpkgsrc' in /usr/pkgsrc
cvs update: failed to create lock directory for `/cvsroot/CVSROOT'
(/cvsroot/CVSROOT/#cvs.val-tags.lock): Permission denied
cvs update: failed to obtain history lock in repository `/cvsroot'
cvs update: warning: cannot open `/cvsroot/CVSROOT/val-tags' read/write:
Permission denied
pkg_comp: I: Command finished successfully
pkg_comp: W: Package shells/bash does not exist
pkg_comp: E: Some packages do not exist in pkgsrc; please fix and retry


In /usr/pkgsrc only a handful of subdirectories are present. Not sure why
cvs is not checking out the full tree.

Is it possible to use git instead of CVS for automatic updates? Or is it
better to do updates manually (UPDATE_SOURCE=false)?

-- 
Mayuresh