From 07357d69d7a6e841def10a2bbf516003ab93c8bc Mon Sep 17 00:00:00 2001
From: Justin Chadwell <me@jedevc.com>
Date: Tue, 16 Aug 2022 12:48:26 +0100
Subject: [PATCH] docs: add bind mount output info to dockerfile->llb docs

Signed-off-by: Justin Chadwell <me@jedevc.com>
---
 docs/dev/dockerfile-llb.md | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/docs/dev/dockerfile-llb.md b/docs/dev/dockerfile-llb.md
index 00ba3890837b..1df0c853fc3d 100644
--- a/docs/dev/dockerfile-llb.md
+++ b/docs/dev/dockerfile-llb.md
@@ -157,14 +157,18 @@ your local state, which is specified through the `llb.Local` state object:
     llb.FollowPaths([]string{"."}),
   )
 
-  st = st.Dir("/builder").Run(
+  execState = st.Dir("/builder").Run(
     llb.Shlex("pip install ."),
     llb.AddEnv(
       "PIP_INDEX_URL",
       "https://my-proxy.com/pypi",
     ),
-    llb.AddMount("/builder", localState)
-  ).Root()
+  )
+  _ := execState.AddMount("/builder", localState)
+  // the return value of AddMount captures the resulting state of the mount
+  // after the exec operation has completed
+
+  st := execState.Root()
   ```
 
 ## Cache mounts