##// END OF EJS Templates
cmdutil: add class to restore dirstate during unexpected failure...
cmdutil: add class to restore dirstate during unexpected failure Before this patch, after "dirstate.write()" execution, there was no way to restore dirstate to the original status before "dirstate.write()". In some code paths, "dirstate.invalidate()" is used as a kind of "restore .hg/dirstate to the original status", but it just avoids writing changes in memory out, and doesn't actually restore the ".hg/dirstate" file. To fix the issue that the recent (in memory) dirstate isn't visible to external processes (e.g. "precommit" hooks), "dirstate.write()" should be invoked before invocation of external processes. But at the same time, ".hg/dirstate" should be restored to its content before "dirstate.write()" during an unexpected failure in some cases. This patch adds the class "dirstateguard" to easily restore ".hg/dirstate" during unexpected failures. Typical usecase of it is: # (1) build dirstate up .... # (2) write dirstate out, and backup ".hg/dirstate" dsguard = dirstateguard(repo, 'scopename') try: # (3) execute somethig to do: # this may imply making some additional changes on dirstate .... # (4) unlink backed-up dirstate file at the end of dsguard scope dsguard.close() finally: # (5) if execution is aborted before "dsguard.close()", # ".hg/dirstate" is restored from the backup dsguard.release() For this kind of issue, an "extending transaction" approach (in https://titanpad.com/mercurial32-sprint) seems to not be suitable, because: - transaction nesting occurs in some cases (e.g. "shelve => rebase"), and - "dirstate" may be already modified since the beginning of OUTER transaction scope, then - dirstate should be backed up into the file other than "dirstate.journal" at the beginning of INNER transaction scope, but - such alternative backup files are useless for transaction itself, and increases complication of its implementation "transaction" and "dirstateguard" differ from each other also in "what it should do for .hg/dirstate" in cases other than success. ============== ======= ======== ============= type success fail "hg rollback" ============== ======= ======== ============= transaction keep keep restore dirstateguard keep restore (not implied) ============== ======= ======== ============= Some collaboration between transaction and dirstate will probably be introduced in the future. But this layer is needed in all cases.

File last commit:

r14233:659f34b8 default
r24991:4169a4f8 default
Show More
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-"