Postpone refs matching to after setting working dir to repo dir. #668
+2
−1
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subproc.Popen() calls in bfg-ish relies on a os.chdir() call to have been made beforehand for each child process to run in the repo dir as required.
get_preservation_info has a subproc.Popen() call that before this change is executed before the required os.chdir() call.