locks: tidy lock acquisition
Combine the check+create done in each script. (The original functions
are still callable as before, but a new combined Aquire_lockfile
function can be called instead, as now used).
Note, a further simplification could be done in removing the passing of the lock filename in as a parameter since every use of the functions is with ".lock". The lock functions already have a fallback to ".build/lock" though. Checking the history, the fallback used to be for a system wide lock, which was then replaced with this config-tree specific one. As long as that is not used implicitly by 3rd-party hooks then surely we are free to change the fallback to ".lock" and further remove passing in a name as a param...?
Gbp-Dch: Short Closes: #952918
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just fyi, the note about further possible simplification was not intended to delay the change as implemented, if that's causing a hold up. it was more just intended to document a potential further improvement for the future.
though if review finds that indeed such a further improvement would be fine, then i could update as such now. (though i'd think it best to be done in a second commit anyway).
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