[PATCH v8 00/15] Sbuild/Schroot migration

[Uladzimir Bely <ubely@ilbers.de>]

This is a patchset showing how sbuild/schroot tools can be integrated
into Isar build system.

Base schroot images are created with sbuild-chroot-target or, in case
of cross-build, sbuild-chroot-host recipes. These images are based on
isar-bootstrap ones, but include some build-related stuff preinstalled.

To use these changes you need to have sbuild and schroot installed and
configured. User who runs build should be added to sbuild group.

Currently, sbuild-related stuff is supported in latest kas.

If Gilab CI is used, the following configuration changes are required:
- external dir for schroot overlay should be set in the config
/etc/gitlab-runner/config.toml:

volumes = ["/path/to/overlay:/var/lib/schroot/union/overlay"]

The patchset was tested with 'meta-iot2050' and 'xenomai-images'
downstreams in combination with kas image mentioned above.

Current limitations:
- parallel building of several packages requires more free space in
comparison with buildchroot-based architecture. This happens due
the sbuild architecture which uses some basic layer (common for all
packages) and per-package separate layer (where builddeps are downloaded
and installed).

Changes since v7:
- fixed work with proxy by adding some environment filters in sbuild;
- DEB_BUILD_PROFILES support simplified and improved
- Fixed gbp-based recipes rebuilding (get back --git-ignore-new option
previously removed)
- fixed base-apt caching for packages and source packages temporary
installed in sbuild isolated environment
- fixed rare build error related to ccache setup (added locking)

Changes since v6:
- added patch that switches sbuild from using source directory to using
.dsc file. The file is generated before sbuild call by `dpkg-source`.

Changes since v5:
- warning about shell exports in dpkg_runbuild_prepend. This should
avoided be reworked to templates.

Changes since v4:
- consider shell exports done in dpkg_runbuild_prepend and pass them
to sbuild environment;
- fixed ccache work.

Changes since v3:
- dpkg_do_mounts() and dpkg_undo_mounts() are not removed for downstreams
compatibility;
- dpkg_build_export is used for adjusting sbuild environment;
- DEB_BUILD_PROFILES support for sbuild is fixed in case of cross-build.

Changes since v2:
- patches reworked/squashed for easier reading and understanding;
- fixed building foreigh architectures with kas-docker;
- implemented support of ccache;
- fixed devshell and devshell_nodeps.

Changes since v1:
- parallel builds with different BUILD_DIR are supported;
- parallel multiconfig targets in one build are supported;
- per-task schroot configuration in /etc/schroot/ is now used;
- patchset now passes Jenkins CI (so patches changes RFC => PATCH).

Anton Mikanovich (1):
  dpkg: Build packages with sbuild

Uladzimir Bely (14):
  dpkg-gbp: Use separate command to export tarball
  dpkg-gbp: Use host tools for dsc preparation
  sbuild: Add recipes for host and target rootfs to run sbuild
  sbuild: Introduce a class for another build method
  sbuild: Support of DEB_BUILD_PROFILES
  sbuild: Support of shell exports from dpkg_runbuild_prepend
  dpkg: Remove builddeps install task.
  sbuild: Add ccache support
  dpkg-base: Switch devshell to use schroot
  dpkg-base: Switch apt_fetch and apt_unpack to use schroot
  doc: Add sbuild-related documentation
  sbuild: Use .dsc file instead of source directory.
  sbuild: Fixed proxy support
  sbuild: Fix debsrc_download for packages dependencies

 doc/user_manual.md                            |  22 +-
 meta/classes/deb-dl-dir.bbclass               |   4 +
 meta/classes/dpkg-base.bbclass                |  78 ++++---
 meta/classes/dpkg-gbp.bbclass                 |  26 +--
 meta/classes/dpkg.bbclass                     | 104 ++++++---
 meta/classes/sbuild.bbclass                   | 211 ++++++++++++++++++
 meta/conf/bitbake.conf                        |   2 +
 .../sbuild-chroot/sbuild-chroot-host.bb       |  13 ++
 .../sbuild-chroot/sbuild-chroot-target.bb     |  10 +
 .../sbuild-chroot/sbuild-chroot.inc           |  39 ++++
 10 files changed, 428 insertions(+), 81 deletions(-)
 create mode 100644 meta/classes/sbuild.bbclass
 create mode 100644 meta/recipes-devtools/sbuild-chroot/sbuild-chroot-host.bb
 create mode 100644 meta/recipes-devtools/sbuild-chroot/sbuild-chroot-target.bb
 create mode 100644 meta/recipes-devtools/sbuild-chroot/sbuild-chroot.inc

-- 
2.20.1