Merge branch '3.x'

1 files changed, 8 insertions, 8 deletions

diff --git a/sphinx/ext/imgmath.py b/sphinx/ext/imgmath.py
index 65f281223..a8da39709 100644
--- a/sphinx/ext/imgmath.py
+++ b/sphinx/ext/imgmath.py
@@ -137,13 +137,13 @@ def compile_math(latex: str, builder: Builder) -> str:
     try:
         subprocess.run(command, stdout=PIPE, stderr=PIPE, cwd=tempdir, check=True)
         return path.join(tempdir, 'math.dvi')
-    except OSError:
+    except OSError as exc:
         logger.warning(__('LaTeX command %r cannot be run (needed for math '
                           'display), check the imgmath_latex setting'),
                        builder.config.imgmath_latex)
-        raise InvokeError
+        raise InvokeError from exc
     except CalledProcessError as exc:
-        raise MathExtError('latex exited with error', exc.stderr, exc.stdout)
+        raise MathExtError('latex exited with error', exc.stderr, exc.stdout) from exc
 
 
 def convert_dvi_to_image(command: List[str], name: str) -> Tuple[str, str]:
@@ -151,13 +151,13 @@ def convert_dvi_to_image(command: List[str], name: str) -> Tuple[str, str]:
     try:
         ret = subprocess.run(command, stdout=PIPE, stderr=PIPE, check=True, encoding='ascii')
         return ret.stdout, ret.stderr
-    except OSError:
+    except OSError as exc:
         logger.warning(__('%s command %r cannot be run (needed for math '
                           'display), check the imgmath_%s setting'),
                        name, command[0], name)
-        raise InvokeError
+        raise InvokeError from exc
     except CalledProcessError as exc:
-        raise MathExtError('%s exited with error' % name, exc.stderr, exc.stdout)
+        raise MathExtError('%s exited with error' % name, exc.stderr, exc.stdout) from exc
 
 
 def convert_dvi_to_png(dvipath: str, builder: Builder) -> Tuple[str, int]:
@@ -298,7 +298,7 @@ def html_visit_math(self: HTMLTranslator, node: nodes.math) -> None:
                                   backrefs=[], source=node.astext())
         sm.walkabout(self)
         logger.warning(__('display latex %r: %s'), node.astext(), msg)
-        raise nodes.SkipNode
+        raise nodes.SkipNode from exc
     if fname is None:
         # something failed -- use text-only as a bad substitute
         self.body.append('<span class="math">%s</span>' %
@@ -324,7 +324,7 @@ def html_visit_displaymath(self: HTMLTranslator, node: nodes.math_block) -> None
                                   backrefs=[], source=node.astext())
         sm.walkabout(self)
         logger.warning(__('inline latex %r: %s'), node.astext(), msg)
-        raise nodes.SkipNode
+        raise nodes.SkipNode from exc
     self.body.append(self.starttag(node, 'div', CLASS='math'))
     self.body.append('<p>')
     if node['number']: