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Each time we invoke a command it's possible that it will change the filesystem in ways that were not described by the target. If that happens but we have cached previous directory contents then we may make decisions or report results based on obsolete information. Keep a count of how many commands we've invoked, and remember the current command count every time we load the contents of a directory. If we request the directory and the current command count has changed we know the cache is outdated so reload from scratch. * NEWS: Announce the change. * src/makeint.h (command_count): Create a global counter. * src/main.c (command_count): Ditto. * src/job.c (reap_children): Increment the counter on job completion. * src/function.c (func_file): Increment if we write a file. * src/dir.c (clear_directory_contents): Clear the current contents of a cached directory. (struct directory_contents): Remember the counter value. (struct directory): Remember the counter value for non-existing dirs. (find_directory): If we have a cached directory and the count hasn't changed then return it. Else, clear the previous contents and re-read from scratch. * tests/scripts/features/dircache: Add tests of the directory cache. |
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