Fixed handling of broken symlinks.

Skipping broken symlinks, but not all symlinks.

Reported in #20

README.rst

@@ -61,6 +61,7 @@ Changed
 
 Fixed
     * https://github.com/Robpol86/sphinxcontrib-versioning/issues/13
+    * https://github.com/Robpol86/sphinxcontrib-versioning/pull/20
 
 Removed
     * Jinja2 context variables: ``scv_root_ref_is_branch`` ``scv_root_ref_is_tag``

sphinxcontrib/versioning/git.py

@@ -277,6 +277,7 @@ def export(local_root, commit, target):
     :param str commit: Git commit SHA to export.
     :param str target: Directory to export to.
     """
+    log = logging.getLogger(__name__)
     git_command = ['git', 'archive', '--format=tar', commit]
 
     with TempDir() as temp_dir:
@@ -289,7 +290,12 @@ def export(local_root, commit, target):
             if not os.path.exists(t_dirpath):
                 os.makedirs(t_dirpath)
             for args in ((os.path.join(s_dirpath, f), os.path.join(t_dirpath, f)) for f in s_filenames):
-                shutil.copy(*args)
+                try:
+                    shutil.copy(*args)
+                except IOError:
+                    if not os.path.islink(args[0]):
+                        raise
+                    log.debug('Skipping broken symlink: %s', args[0])
 
 
 def clone(local_root, new_root, branch, rel_dest, exclude):

tests/test_git/test_export.py

@@ -92,3 +92,27 @@ def test_new_branch_tags(tmpdir, local_light, fail):
     files = [f.relto(target) for f in target.listdir()]
     assert files == ['README']
     assert target.join('README').read() == 'new'
+
+
+def test_symlink(tmpdir, local, run):
+    """Test repos with broken symlinks.
+
+    :param tmpdir: pytest fixture.
+    :param local: conftest fixture.
+    :param run: conftest fixture.
+    """
+    orphan = tmpdir.ensure('to_be_removed')
+    local.join('good_symlink').mksymlinkto('README')
+    local.join('broken_symlink').mksymlinkto('to_be_removed')
+    run(local, ['git', 'add', 'good_symlink', 'broken_symlink'])
+    run(local, ['git', 'commit', '-m', 'Added symlinks.'])
+    run(local, ['git', 'push', 'origin', 'master'])
+    orphan.remove()
+
+    target = tmpdir.ensure_dir('target')
+    sha = run(local, ['git', 'rev-parse', 'HEAD']).strip()
+
+    export(str(local), sha, str(target))
+    run(local, ['git', 'diff-index', '--quiet', 'HEAD', '--'])  # Exit 0 if nothing changed.
+    files = sorted(f.relto(target) for f in target.listdir())
+    assert files == ['README', 'good_symlink']