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git-svn: workaround for a bug in svn serf backend

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Subversion serf backend in versions 1.8.5 and below has a bug(*) that the
function creating the descriptor of a file change -- add_file() --
doesn't make a copy of its third argument when storing it on the
returned descriptor.  As a result, by the time this field is used (in
transactions of file copying or renaming) it may well be released, and
the memory reused.

One of its possible manifestations is the svn assertion triggering on an
invalid path, with a message

svn_fspath__skip_ancestor: Assertion
`svn_fspath__is_canonical(child_fspath)' failed.

This patch works around this bug, by storing the value to be passed as
the third argument to add_file() in a local variable with the same scope
as the file change descriptor, making sure their lifetime is the same.

* [ew: fixed in Subversion r1553376 as noted by Jonathan Nieder]

Cc: Benjamin Pabst <benjamin.pabst85@gmail.com>
Signed-off-by: Eric Wong <normalperson@yhbt.net>
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Roman Kagan <rkagan@mail.ru>
This commit is contained in:
Roman Kagan 2013-12-27 12:05:15 +04:00 committed by Eric Wong
parent 7794a680e6
commit 2394e94e83
1 changed files with 8 additions and 2 deletions
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10
perl/Git/SVN/Editor.pm
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@ -304,8 +304,12 @@ sub C {
my ($self, $m, $deletions) = @_;
my ($dir, $file) = split_path($m->{file_b});
my $pbat = $self->ensure_path($dir, $deletions);
# workaround for a bug in svn serf backend (v1.8.5 and below):
# store third argument to ->add_file() in a local variable, to make it
# have the same lifetime as $fbat
my $upa = $self->url_path($m->{file_a});
my $fbat = $self->add_file($self->repo_path($m->{file_b}), $pbat,
$self->url_path($m->{file_a}), $self->{r});
$upa, $self->{r});
print "\tC\t$m->{file_a} => $m->{file_b}\n" unless $::_q;
$self->chg_file($fbat, $m);
$self->close_file($fbat,undef,$self->{pool});
@ -323,8 +327,10 @@ sub R {
my ($self, $m, $deletions) = @_;
my ($dir, $file) = split_path($m->{file_b});
my $pbat = $self->ensure_path($dir, $deletions);
# workaround for a bug in svn serf backend, see comment in C() above
my $upa = $self->url_path($m->{file_a});
my $fbat = $self->add_file($self->repo_path($m->{file_b}), $pbat,
$self->url_path($m->{file_a}), $self->{r});
$upa, $self->{r});
print "\tR\t$m->{file_a} => $m->{file_b}\n" unless $::_q;
$self->apply_autoprops($file, $fbat);
$self->chg_file($fbat, $m);