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localrepo: handle ValueError during repository opening...

localrepo: handle ValueError during repository opening Python 3.8 can raise ValueError on attempt of an I/O operation against an illegal path. This was causing test-remotefilelog-gc.t to fail on Python 3.8. This commit teaches repository opening to handle ValueError and re-raise an Abort on failure. An arguably better solution would be to implement this logic in the vfs layer. But that seems like a bag of worms and I don't want to go down that rabbit hole. Until users report uncaught ValueError exceptions in the wild, I think it is fine to patch this at the only occurrence our test harness is finding it. Differential Revision: https://phab.mercurial-scm.org/D7944

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      #require no-pure

      A script to generate nasty diff worst-case scenarios:

        $ cat > s.py <<EOF

        > import random

        > for x in range(100000):

        >     print

        >     if random.randint(0, 100) >= 50:

        >         x += 1

        >     print(hex(x))

        > EOF

        $ hg init a

        $ cd a

      Check in a big file:

        $ "$PYTHON" ../s.py > a

        $ hg ci -qAm0

      Modify it:

        $ "$PYTHON" ../s.py > a

      Time a check-in, should never take more than 10 seconds user time:

        $ hg ci --time -m1 --config worker.enabled=no

        time: real .* secs .user [0-9][.].* sys .* (re)

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				#require no-pure

				A script to generate nasty diff worst-case scenarios:

				$ cat > s.py <<EOF
				> import random
				> for x in range(100000):
				> print
				> if random.randint(0, 100) >= 50:
				> x += 1
				> print(hex(x))
				> EOF

				$ hg init a
				$ cd a

				Check in a big file:

				$ "$PYTHON" ../s.py > a
				$ hg ci -qAm0

				Modify it:

				$ "$PYTHON" ../s.py > a

				Time a check-in, should never take more than 10 seconds user time:

				$ hg ci --time -m1 --config worker.enabled=no
				time: real .* secs .user [0-9][.].* sys .* (re)