Mark D. Baushke wrote: > Derek Price <[EMAIL PROTECTED]> writes: > > >I'm getting ready to make two changes, possibly on stable. > > >The first would be to add file locking for the CVSROOT/history and > >CVSROOT/val-tags files. I have some reports of massively corrupted > >history files in large repositories, and I don't see any other likely > >cause. Similarly, I expect locking will also be necessary on val-tags > >in such a large repository and the additional code will be minimal after > >I add the history locking stuff. > > >I was thinking that I would make totally separate lock dirs for this > >(#cvs.history.lock and #cvs.val-tags.lock or somesuch) to allow > >concurrent write access to other CVSROOT files, history, and val-tags. > >I don't think deadlock will be an issue - despite the fact that any > >given process writing to the history file or val-tags might hold any > >number of other locks, the history or val-tags lock will always be > >"last" in the chain and only held for the duration of the write of a > >single line to the file. Does anyone see any problems with that design? > > >Since file corruption is the current consequence of not having these > >locks, I thought this would be justified on stable. Any objections? > > > I have no objections. (I have seen such corrptions and as a result have > reduced the amount of history being logged in favor of custom hacks > using syslog().)
Hrm. That's interesting in some respects... syslog would already handle a bunch of the functionality I've been considering adding, but I think it would be harder to hook into the `cvs history' command. :( > >The other set of changes I was considering would be to enable a number > >of new keywords for the config file to allow CVS to search for config > >files in new locations. I would not be changing the default locations, > >but the new setup would enable something like the following to be > >specified in CVSROOT/config: > > > CheckoutListFile $CVSROOT/CVSROOT/admin/checkoutlist > > CommitInfoFile $CVSROOT/CVSROOT/triggers/commitinfo > > CVSIgnoreFile $CVSROOT/CVSROOT/cvsignore > > CVSWrappersFile $CVSROOT/CVSROOT/admin/cvswrappers > > EditInfoFile $CVSROOT/CVSROOT/triggers/editinfo > > HistoryFile $CVSROOT/CVSROOT/logs/history/%Y%m%d > > HistorySearch $CVSROOT/CVSROOT/logs/history/* > > LogInfoFile $CVSROOT/CVSROOT/triggers/loginfo > > ModulesFile $CVSROOT/CVSROOT/modules > > NotifyFile $CVSROOT/CVSROOT/triggers/notify > > PasswdFile $CVSROOT/CVSROOT/admin/passwd > > RCSInfoFile $CVSROOT/CVSROOT/triggers/rcsinfo > > ReadersFile $CVSROOT/CVSROOT/admin/readers > > TagInfoFile $CVSROOT/CVSROOT/triggers/taginfo > > ValTagsFile $CVSROOT/CVSROOT/admin/val-tags > > VerifyMsgFile $CVSROOT/CVSROOT/triggers/verifymsg > > WritersFile $CVSROOT/CVSROOT/admin/writers > > > Please do not break the assumption of <keyword>=<value> > in the CVSROOT/config file. So, the above would need to > look closer to this: I won't. My apologies for cutting and pasting the list above out of context from an email I received. > CheckoutListFile=$CVSROOT/CVSROOT/admin/checkoutlist > CommitInfoFile=$CVSROOT/CVSROOT/triggers/commitinfo > CVSIgnoreFile=$CVSROOT/CVSROOT/cvsignore > CVSWrappersFile=$CVSROOT/CVSROOT/admin/cvswrappers > EditInfoFile=$CVSROOT/CVSROOT/triggers/editinfo > HistoryFile=$CVSROOT/CVSROOT/logs/history/%Y%m%d > HistorySearch=$CVSROOT/CVSROOT/logs/history/* > LogInfoFile=$CVSROOT/CVSROOT/triggers/loginfo > ModulesFile=$CVSROOT/CVSROOT/modules > NotifyFile=$CVSROOT/CVSROOT/triggers/notify > PasswdFile=$CVSROOT/CVSROOT/admin/passwd > RCSInfoFile=$CVSROOT/CVSROOT/triggers/rcsinfo > ReadersFile=$CVSROOT/CVSROOT/admin/readers > TagInfoFile=$CVSROOT/CVSROOT/triggers/taginfo > ValTagsFile=$CVSROOT/CVSROOT/admin/val-tags > VerifyMsgFile=$CVSROOT/CVSROOT/triggers/verifymsg > WritersFile=$CVSROOT/CVSROOT/admin/writers > > Am I correct in assuming that this change also assumes handling > expansions of internal CVS variables like $CVSROOT is being added to to > CVSROOT/config processing and that those are NOT general purpose > environment variables being added? Yes. I'll probably hook into the same function used to do this by the trigger scripts, expand_path(). This should enable the same config file to be used in multiple CVS roots as well. An associated change I was putting off talking about was adding a global `-c <config_file>' option to cause CVS to look elsewhere for its configuration file. > >Note that HistoryFile has an argument that would basically be run > >through strftime, to enable log rotation. Also see the HistorySearch, > >which would be used as a file glob to locate history files to be read > >for executions of the `cvs history' command. > > > Hmmm.... I do not like the BSD glob(3) function and its introduction in > CVS would not make sense given we already have POSIX fnmatch() > available... It would be better to specify looking for history files in > terms of fnmatch() semantics if that is what you intend to use to do the > resolution. That is what I meant. I had thought that a "file glob" was not precise and referred to a whole class of path expansion, using patterns like "name.??.* ", and implemented by various functions including fnmatch. I use the term in the same way I might specify "regex" matching when I don't see a need to be more precise (e.g. "basic regex", "extended regex", "perl regex", etc.). I completely intended and continue to intend to use the POSIX fnmatch() we've already imported from GNULIB to implement this matching and any similar matching in the future. Regards, Derek
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