auxdata: file locking and VRT source checks #292
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johntruckenbrodt
changed the title
…to feature/auxdata_file_locking
…to feature/auxdata_file_locking
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This adds file locking to the
auxdatadownload mechanisms and thedem_createfunction. This way, situations can be avoided where two parallel processes depend on the same file but one tries to use it while the other one has not finished creating it. Locks are applied to downloaded DEM tiles as well as created mosaics.Furthermore, the source files of a VRT are now checked in
dem_createto avoid incomplete mosaics (fixes #196).