All the queries that used sqlite_exec_void() and sqlite_exec_int64() and
sqlite_exec_strbuf() now do a sleep-retry while the Rhizome db is locked.
There are other queries that still need conversion, and some old infinite
retry logic that needs replacing.
Commit 5cbc2167ec changed the servald 'start'
command to use a different argv[0], which meant that the testdefs.sh
get_servald_pids() function no longer detected running servald processes.
This broke most of the 'server' test cases.
testdefs.sh setup_servald() now makes a full copy of servald once per test
case, not just a symbolic link, so that the logic in get_servald_pids() works
again.
Add sqlite_exec_void_retry() function, use it in
rhizome_update_file_priority(). This should be reviewed to ensure that the
server process never sleeps.
The general problem remains of what the servald process should do if the
database is locked when it tries to update. Simplest solution is to sleep and
retry, but that blocks all other services and would hurt VoMP. A better
solution would be for each Rhizome operation to collect its database updates
into a single transaction and place that in a work queue that gets called using
schedule() (or even watch() if a file-descriptor event can somehow be used when
the database becomes available). Another solution is perhaps to perform all
Rhizome operations in a dedicated process that can block indefinitely on the
database without affecting servald responsiveness.
The '~' (regular expression match) operator does not implicitly anchor the
expression to the ends of the text, ie, does not put ^...$ around the pattern.
That leaves the test writer free to specify a full or anchored or interior
match.
Uses bash job control internally instead of PIDs, because job control
allows all processes in a job to be killed.
Changes the way _tfw_shopt/_tfw_shopt_restore work, to avoid "unrestored shopt"
errors on interrupt.
Change internal implementation of assertExpr to use shell commands test(1) and
grep(1) instead of awk(1), so that we can write 'assertExpr "$var" '~' "$rexp"
where $rexp is a grep regular expression. (awk(1) does not support \{N,M\} in
regular expressions.)
