[PATCH v1 0/5] Restore downstream mounts compatibility

[Anton Mikanovich <amikan@ilbers.de>]

Revert commit d21d49578e5a3b0019075d1946bd93a95914fcca which has broken
compatibility with upstream projects.
Make the same fix by catching bb.build.TaskFailed event and unmount
any lost paths.
Also make undo_mounts functions to be safe for calling in case there is
no do_mounts call before. This will make fail policy more tolerant.
Enable refrence counting for image mounts in case there are several
images using like ubi-ubifs-img does.

This implementation do not call buildchroot_undo_mounts in task fail
handler, because there is hard not to broke other tasks execution. So
it will not fully cover pure buildchroot_do_mounts usage like
wic-img.bbclass does.

Tested with kas-iot2050-example project from:
https://github.com/siemens/meta-iot2050

Anton Mikanovich (5):
  Revert "dpkg: Make mount buildroot reliable"
  mount: Allow calling unmount on not mounted paths
  dpkg: Remove unmount loop
  image: Add reference counter
  events: Unmount all lost mounts at task fail

 meta/classes/buildchroot.bbclass |  20 ++---
 meta/classes/dpkg-base.bbclass   | 122 +++++++++++--------------------
 meta/classes/dpkg-gbp.bbclass    |   8 +-
 meta/classes/dpkg.bbclass        |  14 +---
 meta/classes/image.bbclass       |  39 +++++++++-
 meta/classes/isar-events.bbclass |  27 +++++++
 meta/classes/rootfs.bbclass      |  20 ++---
 7 files changed, 136 insertions(+), 114 deletions(-)

-- 
2.25.1