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hg: obtain lock when creating share from pooled repo (issue5104)...
hg: obtain lock when creating share from pooled repo (issue5104) There are race conditions between clients performing a shared clone to pooled storage: 1) Clients race to create the new shared repo in the pool directory 2) 1 client is seeding the repo in the pool directory and another goes to share it before it is fully cloned We prevent these race conditions by obtaining a lock in the pool directory that is derived from the name of the repo we will be accessing. To test this, a simple generic "lockdelay" extension has been added. The extension inserts an optional, configurable delay before or after lock acquisition. In the test, we delay 2 seconds after lock acquisition in the first process and 1 second before lock acquisition in the 2nd process. This means the first process has 1s to obtain the lock. There is a race condition here. If we encounter it in the wild, we could change the dummy extension to wait on the lock file to appear instead of relying on timing. But that's more complicated. Let's see what happens first.

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r14233:659f34b8 default
r28289:d493d647 3.7.2 stable
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dumprevlog
25 lines | 676 B | text/plain | TextLexer
Matt Mackall
add simple dump and undump scripts to contrib/
r6433 #!/usr/bin/env python
# Dump revlogs as raw data stream
# $ find .hg/store/ -name "*.i" | xargs dumprevlog > repo.dump
import sys
Adrian Buehlmann
contrib: fix binary file issues with dumprevlog on Windows...
r6466 from mercurial import revlog, node, util
for fp in (sys.stdin, sys.stdout, sys.stderr):
Adrian Buehlmann
rename util.set_binary to setbinary
r14233 util.setbinary(fp)
Matt Mackall
add simple dump and undump scripts to contrib/
r6433
for f in sys.argv[1:]:
Adrian Buehlmann
contrib: fix binary file issues with dumprevlog on Windows...
r6466 binopen = lambda fn: open(fn, 'rb')
r = revlog.revlog(binopen, f)
Matt Mackall
add simple dump and undump scripts to contrib/
r6433 print "file:", f
Matt Mackall
add __len__ and __iter__ methods to repo and revlog
r6750 for i in r:
Matt Mackall
add simple dump and undump scripts to contrib/
r6433 n = r.node(i)
p = r.parents(n)
d = r.revision(n)
print "node:", node.hex(n)
Matt Mackall
linkrev: take a revision number rather than a hash
r7361 print "linkrev:", r.linkrev(i)
Matt Mackall
add simple dump and undump scripts to contrib/
r6433 print "parents:", node.hex(p[0]), node.hex(p[1])
print "length:", len(d)
print "-start-"
print d
print "-end-"