[LyX/master] Simplify checking whether files are controlled by SVN and GIT.

[Scott Kostyshak]

On Mon, Dec 28, 2020 at 03:45:11PM +0200, Yuriy Skalko wrote:
> > > > I am sorry not to have a time to follow this thoroughly, but is this
> > > > cvs log / git log used only inh "register" case as initially discussed
> > > > or you want to use it on every file load?
> > > > Calling log could but pretty expensive operation for large archives.
> > > 
> > > The -n0 flag that Yuriy proposed should take care of that, too. So
> > > another reason to go that way.
> > 
> > 
> > I understood that. The minor concern was that it can still take seconds to get
> > the first commit touching particular file in larger git repos if its buried
> > down in the history.  But maybe it's not that different from git-ls.
> > 
> > My main concern though were changes to CVS - I haven't seen -n0 equivalent and
> > are you positive that cvs log does not actually try to connect to server (would
> > make us fail if you are offline)? It's really long time ago I used cvs, but
> > IIRC each tracked directory has the needed metadata locally at the place
> > so do we actualy need these changes to fulfil the users-list request?
> > 
> > Sorry for nitpicking, but given that this piece of code is executed at each
> > document load we better be super careful here...
> > 
> > Pavel
> 
> Committed "-n 0" for Git. CVS has "-Q" option (https://www.gnu.org/software/trans-coord/manual/cvs/html_node/Global-options.html#Global-options)
> that may help too, but I have no CVS installed, so cannot test this.

I'm not sure that "git log <filename" and "git log -n 0 <filename>" do
what we want here. For me (git version 2.20.1) they do not exit with
error if the file is not tracked.

I can see why the implementation in the previous version of using git-ls
was complex since we had to redirect output to a file and check it, but
what about using "git ls-files --error-unmatch <file name>" ? The
"--error-unmatch" seems to make it so we don't have to check a file.
The only annoyance I see is that there is no "--quiet" option so we
would need to redirect the output. I can look into adding a "quiet"
argument to doVCCommandCall() that would quiet both STDOUT and STDERR if
the attached patch is on the right track.

Scott
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