docs: add "page source" link to sphinx documentation

Add a link to the top of the sidebar in every docs page that takes the
user back to the source code in gitlab.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20201102130926.161183-5-berrange@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
diff --git a/docs/_templates/editpage.html b/docs/_templates/editpage.html
new file mode 100644
index 0000000..4319b0f
--- /dev/null
+++ b/docs/_templates/editpage.html
@@ -0,0 +1,5 @@
+<div id="editpage">
+  <ul>
+    <li><a href="https://gitlab.com/qemu-project/qemu/-/blob/master/docs/{{pagename}}.rst">Page source</a></li>
+  </ul>
+</div>
diff --git a/docs/conf.py b/docs/conf.py
index e584f68..d40d8ff 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -177,6 +177,7 @@
 html_sidebars = {
     '**': [
         'about.html',
+        'editpage.html',
         'navigation.html',
         'searchbox.html',
     ]
diff --git a/docs/devel/_templates/editpage.html b/docs/devel/_templates/editpage.html
new file mode 100644
index 0000000..a86d22b
--- /dev/null
+++ b/docs/devel/_templates/editpage.html
@@ -0,0 +1,5 @@
+<div id="editpage">
+  <ul>
+    <li><a href="https://gitlab.com/qemu-project/qemu/-/blob/master/docs/devel/{{pagename}}.rst">Page source</a></li>
+  </ul>
+</div>
diff --git a/docs/interop/_templates/editpage.html b/docs/interop/_templates/editpage.html
new file mode 100644
index 0000000..215e562
--- /dev/null
+++ b/docs/interop/_templates/editpage.html
@@ -0,0 +1,5 @@
+<div id="editpage">
+  <ul>
+    <li><a href="https://gitlab.com/qemu-project/qemu/-/blob/master/docs/interop/{{pagename}}.rst">Page source</a></li>
+  </ul>
+</div>
diff --git a/docs/specs/_templates/editpage.html b/docs/specs/_templates/editpage.html
new file mode 100644
index 0000000..aaa468a
--- /dev/null
+++ b/docs/specs/_templates/editpage.html
@@ -0,0 +1,5 @@
+<div id="editpage">
+  <ul>
+    <li><a href="https://gitlab.com/qemu-project/qemu/-/blob/master/docs/specs/{{pagename}}.rst">Page source</a></li>
+  </ul>
+</div>
diff --git a/docs/system/_templates/editpage.html b/docs/system/_templates/editpage.html
new file mode 100644
index 0000000..6586b2e
--- /dev/null
+++ b/docs/system/_templates/editpage.html
@@ -0,0 +1,5 @@
+<div id="editpage">
+  <ul>
+    <li><a href="https://gitlab.com/qemu-project/qemu/-/blob/master/docs/system/{{pagename}}.rst">Page source</a></li>
+  </ul>
+</div>
diff --git a/docs/tools/_templates/editpage.html b/docs/tools/_templates/editpage.html
new file mode 100644
index 0000000..2a9c8fc
--- /dev/null
+++ b/docs/tools/_templates/editpage.html
@@ -0,0 +1,5 @@
+<div id="editpage">
+  <ul>
+    <li><a href="https://gitlab.com/qemu-project/qemu/-/blob/master/docs/tools/{{pagename}}.rst">Page source</a></li>
+  </ul>
+</div>
diff --git a/docs/user/_templates/editpage.html b/docs/user/_templates/editpage.html
new file mode 100644
index 0000000..1f5ee01
--- /dev/null
+++ b/docs/user/_templates/editpage.html
@@ -0,0 +1,5 @@
+<div id="editpage">
+  <ul>
+    <li><a href="https://gitlab.com/qemu-project/qemu/-/blob/master/docs/user/{{pagename}}.rst">Page source</a></li>
+  </ul>
+</div>