git-svn: fix several fetch bugs related to repeated invocations

We no longer delete the top-level directory even if it got
deleted from the upstream repository.  In gs_do_update; we
double-check that the path we're tracking exists at both
endpoints before proceeding.  We have also added additional
protection against fetching revisions out-of-order.

To simplify our internal interfaces, I've disabled passing the
'recursive' flag to the gs_do_{switch,update} wrapper functions
since we always want it in git-svn.  We also pass the
entire Git::SVN object rather than just the path because it
helped me debug.

When printing progress, the refname is printed out to make
it less confusing when multi-fetch is running.

Signed-off-by: Eric Wong <normalperson@yhbt.net>

diff --git a/git-svn.perl b/git-svn.perl
index 845f22af59eeec1366331d190f7532dfec98327d..2afa2537b9c1af92700777f9426f59de82d0b31c 100755 (executable)
--- a/git-svn.perl
+++ b/git-svn.perl
@@ -981,6 +981,12 @@ sub full_url {
 
 sub do_git_commit {
        my ($self, $log_entry) = @_;
+       my $lr = $self->last_rev;
+       if (defined $lr && $lr >= $log_entry->{revision}) {
+               die "Last fetched revision of ", $self->refname,
+                   " was r$lr, but we are about to fetch: ",
+                   "r$log_entry->{revision}!\n";
+       }
        if (my $c = $self->rev_db_get($log_entry->{revision})) {
                croak "$log_entry->{revision} = $c already exists! ",
                      "Why are we refetching it?\n";
@@ -1024,7 +1030,7 @@ sub do_git_commit {
 
        $self->{last_rev} = $log_entry->{revision};
        $self->{last_commit} = $commit;
-       print "r$log_entry->{revision} = $commit\n";
+       print "r$log_entry->{revision} = $commit ($self->{ref_id})\n";
        return $commit;
 }
 
@@ -1121,14 +1127,13 @@ sub find_parent_branch {
                        # at the moment), so we can't rely on it
                        $self->{last_commit} = $parent;
                        $ed = SVN::Git::Fetcher->new($self);
-                       $gs->ra->gs_do_switch($r0, $rev, $gs->{path}, 1,
+                       $gs->ra->gs_do_switch($r0, $rev, $gs,
                                              $self->full_url, $ed)
                          or die "SVN connection failed somewhere...\n";
                } else {
                        print STDERR "Following parent with do_update\n";
                        $ed = SVN::Git::Fetcher->new($self);
-                       $self->ra->gs_do_update($rev, $rev, $self->{path},
-                                               1, $ed)
+                       $self->ra->gs_do_update($rev, $rev, $self, $ed)
                          or die "SVN connection failed somewhere...\n";
                }
                print STDERR "Successfully followed parent\n";
@@ -1170,8 +1175,7 @@ sub do_fetch {
                $ed = SVN::Git::Fetcher->new($self);
                $ed->{new_fetch} = 1;
        }
-       unless ($self->ra->gs_do_update($last_rev, $rev,
-                                       $self->{path}, 1, $ed)) {
+       unless ($self->ra->gs_do_update($last_rev, $rev, $self, $ed)) {
                die "SVN connection failed somewhere...\n";
        }
        $self->make_log_entry($rev, \@parents, $ed);
@@ -1616,6 +1620,8 @@ sub delete_entry {
        my ($self, $path, $rev, $pb) = @_;
 
        my $gpath = $self->git_path($path);
+       return undef if ($gpath eq '');
+
        # remove entire directories.
        if (command('ls-tree', $self->{c}, '--', $gpath) =~ /^040000 tree/) {
                my ($ls, $ctx) = command_output_pipe(qw/ls-tree
@@ -2233,12 +2239,23 @@ sub uuid {
 }
 
 sub gs_do_update {
-       my ($self, $rev_a, $rev_b, $path, $recurse, $editor) = @_;
+       my ($self, $rev_a, $rev_b, $gs, $editor) = @_;
+       my $new = ($rev_a == $rev_b);
+       my $path = $gs->{path};
+
+       my $ta = $self->check_path($path, $rev_a);
+       my $tb = $new ? $ta : $self->check_path($path, $rev_b);
+       return 1 if ($tb != $SVN::Node::dir && $ta != $SVN::Node::dir);
+       if ($ta == $SVN::Node::none) {
+               $rev_a = $rev_b;
+               $new = 1;
+       }
+
        my $pool = SVN::Pool->new;
        $editor->set_path_strip($path);
        my (@pc) = split m#/#, $path;
        my $reporter = $self->do_update($rev_b, (@pc ? shift @pc : ''),
-                                       $recurse, $editor, $pool);
+                                       1, $editor, $pool);
        my @lock = $SVN::Core::VERSION ge '1.2.0' ? (undef) : ();
 
        # Since we can't rely on svn_ra_reparent being available, we'll
@@ -2253,7 +2270,6 @@ sub gs_do_update {
        }
        die "BUG: '$sp' != '$final'\n" if ($sp ne $final);
 
-       my $new = ($rev_a == $rev_b);
        $reporter->set_path($sp, $rev_a, $new, @lock, $pool);
 
        $reporter->finish_report($pool);
@@ -2264,7 +2280,8 @@ sub gs_do_update {
 # this requires SVN 1.4.3 or later (do_switch didn't work before 1.4.3, and
 # svn_ra_reparent didn't work before 1.4)
 sub gs_do_switch {
-       my ($self, $rev_a, $rev_b, $path, $recurse, $url_b, $editor) = @_;
+       my ($self, $rev_a, $rev_b, $gs, $url_b, $editor) = @_;
+       my $path = $gs->{path};
        my $pool = SVN::Pool->new;
 
        my $full_url = $self->{url};
@@ -2282,8 +2299,7 @@ sub gs_do_switch {
                }
        }
        $ra ||= $self;
-       my $reporter = $ra->do_switch($rev_b, '',
-                                     $recurse, $url_b, $editor, $pool);
+       my $reporter = $ra->do_switch($rev_b, '', 1, $url_b, $editor, $pool);
        my @lock = $SVN::Core::VERSION ge '1.2.0' ? (undef) : ();
        $reporter->set_path('', $rev_a, 0, @lock, $pool);
        $reporter->finish_report($pool);
@@ -2333,6 +2349,8 @@ sub gs_fetch_loop_common {
                                if ($paths) {
                                        $gs->match_paths($paths) or next;
                                }
+                               my $lr = $gs->last_rev;
+                               next if defined $lr && $lr >= $r;
                                next if defined $gs->rev_db_get($r);
                                if (my $log_entry = $gs->do_fetch($paths, $r)) {
                                        $gs->do_git_commit($log_entry);

diff --git a/t/t9104-git-svn-follow-parent.sh b/t/t9104-git-svn-follow-parent.sh
index dcec16bda236ecad6c8c3bfa2679615d5f6e3fc7..41b9c19d4568891e1221f0d58abbb986b22a37a0 100755 (executable)
--- a/t/t9104-git-svn-follow-parent.sh
+++ b/t/t9104-git-svn-follow-parent.sh
@@ -95,12 +95,12 @@ test_expect_success 'follow higher-level parent' "
         "
 
 test_expect_success 'follow deleted directory' "
-       svn mv -m 'bye!' $svnrepo/glob/blob/hi $svnrepo/glob/blob/bye&&
+       svn mv -m 'bye!' $svnrepo/glob/blob/hi $svnrepo/glob/blob/bye &&
        svn rm -m 'remove glob' $svnrepo/glob &&
        git-svn init -i glob $svnrepo/glob &&
        git-svn fetch -i glob &&
-       test \"\`git cat-file blob refs/remotes/glob~1:blob/bye\`\" = hi &&
-       test -z \"\`git ls-tree -z refs/remotes/glob\`\"
+       test \"\`git cat-file blob refs/remotes/glob:blob/bye\`\" = hi &&
+       test \"\`git ls-tree refs/remotes/glob | wc -l \`\" -eq 1
        "
 
 # ref: r9270 of the Subversion repository: (http://svn.collab.net/repos/svn)
@@ -146,6 +146,16 @@ test_expect_success "track initial change if it was only made to parent" "
             \"\`git rev-parse r9270-d~1\`\"
        "
 
+test_expect_success "multi-fetch continues to work" "
+       git-svn multi-fetch --follow-parent
+       "
+
+test_expect_success "multi-fetch works off a 'clean' repository" "
+       rm -r $GIT_DIR/svn $GIT_DIR/refs/remotes $GIT_DIR/logs &&
+       mkdir $GIT_DIR/svn &&
+       git-svn multi-fetch --follow-parent
+       "
+
 test_debug 'gitk --all &'
 
 test_done