[BUG RFC/PATCH] git-cvsimport

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This is more of a BUG than a RFC/PATCH.

Now that Junio has applied my patch to not write test results under
harness I can:

    sudo chown -R root t

And run the tests with --root=/dev/shm under prove, except for 3
git-cvsimport tests. I have pending patches to these, after they'll
get in I'll fix that.

But the reason they hang is interesting:

    rm -rf /tmp/meh;
    git init /tmp/meh &&
    cd /tmp/meh &&
    sudo chown -R root /home/avar/g/git/t/t9601/cvsroot &&
    cvsps --norc -q --cvs-direct -u -A --root
/home/avar/g/git/t/t9601/cvsroot module
    Initialized empty Git repository in /tmp/meh/.git/

cvsps will just hang due to the unfriendly chmod. Maybe we want
something like the below to deal with that.

However, even then it'll still hang on something else, I haven't
looked into what. I'm just going to fix this by having it copy the
things it needs to the --root directory.

 git-cvsimport.perl |   21 +++++++++++++++++++--
 1 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/git-cvsimport.perl b/git-cvsimport.perl
index 9e03eee..1a93fb4 100755
--- a/git-cvsimport.perl
+++ b/git-cvsimport.perl
@@ -688,8 +688,25 @@ unless ($opt_P) {
        }
        ($cvspsfh, $cvspsfile) = tempfile('gitXXXXXX', SUFFIX => '.cvsps',
                                          DIR => File::Spec->tmpdir());
-       while (<CVSPS>) {
-           print $cvspsfh $_;
+       # Alarm because "cvsps --norc -q --cvs-direct -u -A --root
+       # /home/avar/g/git/t/t9601/cvsroot module" will hang forever if
+       # the "t9601/cvsroot" directory isn't writable by us.
+       {
+               my $got_input;
+               my $start = time;
+               local $SIG{ALRM} = sub {
+                       unless ($got_input) {
+                               die sprintf "cvsps left us hanging for
%d seconds, do you have permission to write to %s?",
+                                   time() - $start,
+                                   $opt_d;
+                       }
+               };
+               alarm 10;
+               while (<CVSPS>) {
+                       $got_input = 1;
+                       print $cvspsfh $_;
+               }
+               alarm 0;
        }
        close CVSPS;
        $? == 0 or die "git cvsimport: fatal: cvsps reported error\n";
--
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