[PATCH v5 0/5] Restore downstream mounts compatibility

[Anton Mikanovich <amikan@ilbers.de>]

Revert commit d21d49578e5a3b0019075d1946bd93a95914fcca which has broken
compatibility with downstream projects. Move try-finally from
dpkg_runbuild(), etc. to the caller, do_dpkg_build().

Also enable reference counting for image mounts for several image tasks
running in parallel (like e.g. ubi-ubifs-img).

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

---
Changes sinse v4:
- Fix while loop counts.
- Move unmount warnings under debug.
Changes since v3:
- Warn on first entering in umount while loop.
- Do not warn on left mounts by default.
- Remote incorrect dpkg unmount usage protection.
- Rebase on next.
- Improve commit messages.
Changes since v2:
- Remove incorrect buildchroot/rootfs mount/unmount usage protection.
- Remove task fail handler.
- Implement double mount protection by try-finally.
Changes since v1:
- Get back while loop in dpkg_undo_mounts.
- Exit dpkg_undo_mounts if already mounted.
- Do not ignore exceptions in safe_exec.

Anton Mikanovich (5):
  Revert "dpkg: Make mount buildroot reliable"
  dpkg: Limit unmount loop
  image: Add reference counter
  dpkg-base: Clean up unmounting in do_dpkg_build()
  events: Do not warn on left mounts by default

 meta/classes/dpkg-base.bbclass   | 125 +++++++++++++------------------
 meta/classes/dpkg-gbp.bbclass    |   8 +-
 meta/classes/dpkg.bbclass        |  14 +---
 meta/classes/image.bbclass       |  39 +++++++++-
 meta/classes/isar-events.bbclass |   2 +-
 5 files changed, 97 insertions(+), 91 deletions(-)

-- 
2.25.1