This directory contains my scripts to build backports of R software from Debian
sid or even experimental to older Debian distributions.

Currently I am using the following setup:

~/.pbuilderrc contains:

  NAME="$DIST-$ARCH"
  APTCACHEHARDLINK=yes
  DISTRIBUTION="$DIST"
  DEBOOTSTRAPOPTS=("--arch" "$ARCH" 
    "${DEBOOTSTRAPOPTS[@]}")
  APTKEYRINGS="/home/jranke/.gnupg/pubring.gpg"
  BASETGZ="`dirname $BASETGZ`/$NAME-base.tgz"
  BUILDRESULT="/var/cache/pbuilder/$NAME/result/"
  APTCACHE="/var/cache/pbuilder/$NAME/aptcache/"
  MIRRORSITE="http://deb.debian.org/debian/"
  OTHERMIRROR="deb http://security.debian.org/debian-security $DIST-security main|deb http://ftp.de.debian.org/debian $DIST-backports main|deb http://localhost/r-cran $DIST-cran46/"
  COMPONENTS="main"

This means I have the appropriate aptcache and buildresult directories set up
under /var/cache/pbuilder. I have several pbuilder images used for package
creation under /var/cache/pbuilder, among others:

  /var/cache/pbuilder/bookworm-amd64-base.tgz

With the pbuilderrc mentioned above, this can be created as a normal user with

  sudo mkdir -p /var/cache/pbuilder/bookworm-amd64/{aptcache,build}
  export ARCH=amd64
  export DIST=bookworm
  sudo -E pbuilder create

When using these scripts on Debian, I used to configure sudo to allow my normal
user to use pbuilder, apt-get and the backporting scripts. Currently, I have 
set up my Debian installations using the Ubuntu like sudo configuration that
I select during the installation.

I am building other architectures in a chroot, currently only arm64 on a
different machine.

For creating a local chroot, I am using (e.g. for bookworm)

  cd /var/chroot
  sudo mkdir bookworm-arm64
  sudo debootstrap bookworm bookworm-arm64 http://deb.debian.org/debian/

Then I add a new entry in /etc/schroot/schroot.conf like

  [bookworm]
  description=Debian bookworm arm64
  type=directory
  profile=default
  directory=/var/chroot/bookworm-arm64

and use sudo schroot -c bookworm to enter it. Within the chroot I install
some necessary or useful stuff

  apt install vim gnupg build-essential devscripts

add the matching local or global r-cran repository to /etc/apt/sources.list like

  deb http://localhost/r-cran bookworm-cran46/
  deb-src http://localhost/r-cran bookworm-cran46/

and tell apt to trust my key (from my Debian CRAN page):

  gpg --keyserver keyserver.ubuntu.com --recv-key '95C0FAF38DB3CCAD0C080A7BDC78B2DDEABC47B7'
  gpg --armor --export '95C0FAF38DB3CCAD0C080A7BDC78B2DDEABC47B7' > /etc/apt/trusted.gpg.d/cran_debian_key.asc

In the chroot, build-essential and devscripts have to be installed