If a build has ‘preferLocalBuilds = true’ (or we're not using remote
building), and the build has a non-permanent failure, then the build
status should be "Aborted" rather than "Failed". This is denoted by
an exit status of 100 from nix-store.
This gets rid of the openHydraDB function and ensures that we
open the database in a consistent way.
Also drop the PostgreSQL sequence hacks. They don't seem to be
necessary anymore.
This isn't perfect because it doesn't handle the case where a
previous build hasn't finished yet. But at least it won't send mail
for old builds that fail while a newer build has already succeeded.
Prepared statements are sometimes much slower than unprepared
statements, because the planner doesn't have access to the query
parameters. This is the case for the active build steps query (in
/status), where a prepared statement is three orders of magnitude
slower. So disable the use of prepared statements in this case.
(Since the query parameters are constant here, it would be nicer if we
could tell DBIx::Class to prepare a statement with those parameters
fixed. But I don't know an easy way to do so.)
The underscores are ugly and the .pl extension is an implementation
detail that shouldn't be visible to the outside.
Also, get rid of the *.in files. It's not really necessary to
generate them. And I was always modifying the wrong file.
