sbuild migration problem: how to jump into SBUILD_CHROOT with build dependencies installed

[Florian Bezdeka <florian.bezdeka@siemens.com>]

Hi all,

I'm trying to update Isar to the latest next version in one of our
downstream layers. This is the first version for this layer that uses
sbuild.

One of the recipes has the following dpkg_runbuild_prepend() defined:

dpkg_runbuild_prepend() {
    sudo chroot --userspec=$( id -u ):$( id -g ) ${BUILDCHROOT_DIR} \
        sh -c "autoreconf -fi"
}

In the pre-sbuild times this task was executed *after* the build
dependencies have been installed but *before* the dpkg_runbild task.

With sbuild:
- There is no "install build dependencies" task anymore
  Installation of build dependencies is done by sbuild internally
- The task is now executed *before* build dependencies are installed
- I still could chroot into ${SBUILD_CHROOT}, but the build dependencies
  will not be there

Is there any possibility to jump into the ${SBUILD_CHROOT} after build
dependencies are installed but before the actual packet build?

Best regards,
Florian

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