Return the proper successful command

Author: humitos

readthedocs/doc_builder/backends/sphinx.py

@@ -434,7 +434,7 @@ def _build_latexmk(self, cwd, latex_cwd):
             cwd=latex_cwd,
         )
 
-        cmd_ret = self.run(
+        cmd = self.run(
             'latexmk',
             '-r',
             rcfile,
@@ -451,7 +451,7 @@ def _build_latexmk(self, cwd, latex_cwd):
 
         self.pdf_file_name = f'{self.project.slug}.pdf'
 
-        return True  # :)
+        return cmd.successful
 
     def _build_pdflatex(self, tex_files, latex_cwd):
         pdflatex_cmds = [