There are some other places with subprocesses:
- borg create --content-from-command
- borg create --paths-from-command
- (de)compression filter process of import-tar / export-tar
in the finally-block, we wait for the filter process to die. but it only dies
voluntarily if all data was processed by the filter and it terminates due to EOF.
otoh, if borg has thrown an early exception, e.g. "archive already exists",
we need to kill the filter process to bring it to an early end. in that
case, we also do not need to check the filter rc, because we know we killed it.
- add a daemonizing() ctx manager
The foreground borg mount process (local repo) survives until the lock
migration (performed by the background) is finished, so the lock to be
migrated is never stale, and the race condition is gone.
- add a test case revealing that locking is not safe during daemonization (borg mount)
- amend printing in testsuite.archiver
refactor: make a generally usable function
fix: remove support code for ancient pyinstaller
the "else" branch was needed for pyinstaller < 20160820 because it did
not have the LD_LIBRARY_PATH_ORIG env var, so we just killed LDLP
because we had no better way.
but with borg tests running under fakeroot, this is troublesome as
fakeroot uses this also and can't find its library without it.
so, just remove it, we do not need to support old pyinstaller.
Paul D