git-svn: allow disabling expensive broken symlink checks

diff --git a/git-svn.perl b/git-svn.perl
index 79888a05c400ef495157a39aad1de12cf16ea7d2..bebcbdea20d9d3725fb761bcafd0126b36f4c4ca 100755 (executable)
--- a/git-svn.perl
+++ b/git-svn.perl
@@ -3271,10 +3271,18 @@ sub new {
 # do_{switch,update}
 sub _mark_empty_symlinks {
        my ($git_svn) = @_;
+       my $bool = Git::config_bool('svn.brokenSymlinkWorkaround');
+       return {} if (defined($bool) && ! $bool);
+
        my %ret;
        my ($rev, $cmt) = $git_svn->last_rev_commit;
        return {} unless ($rev && $cmt);
 
+       # allow the warning to be printed for each revision we fetch to
+       # ensure the user sees it.  The user can also disable the workaround
+       # on the repository even while git svn is running and the next
+       # revision fetched will skip this expensive function.
+       my $printed_warning;
        chomp(my $empty_blob = `git hash-object -t blob --stdin < /dev/null`);
        my ($ls, $ctx) = command_output_pipe(qw/ls-tree -r -z/, $cmt);
        local $/ = "\0";
@@ -3283,6 +3291,18 @@ sub _mark_empty_symlinks {
        while (<$ls>) {
                chomp;
                s/\A100644 blob $empty_blob\t//o or next;
+               unless ($printed_warning) {
+                       print STDERR "Scanning for empty symlinks, ",
+                                    "this may take a while if you have ",
+                                    "many empty files\n",
+                                    "You may disable this with `",
+                                    "git config svn.brokenSymlinkWorkaround ",
+                                    "false'.\n",
+                                    "This may be done in a different ",
+                                    "terminal without restarting ",
+                                    "git svn\n";
+                       $printed_warning = 1;
+               }
                my $path = $_;
                my (undef, $props) =
                               $git_svn->ra->get_file($pfx.$path, $rev, undef);