package_manager.py: add debugging support for rpm scriptlet execution
By default, smart is invoked with --log-level=warning, which hides all
output from pre/post install scriptlets. That makes it hard to debug
scriptlet failure or why they get postponed to first-boot via
/etc/rpm-postinst.
The new ROOTFS_RPM_DEBUG variabled is expected to be set to an integer in
local.conf an incrementally adds more output:
0 = default, only warnings
1 = --log-level=info (includes information about executing scriptlets and their output)
2 = --log-level=debug
3 = --log-level=debug plus dumps of scriplet content and command invocation
The default behavior is not changed yet, but it seems that level 1 would
be a better default.
Signed-off-by: Patrick Ohly <patrick.ohly@intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
