[Buildroot] [PATCH] utils/docker-run: Support BR2_EXTERNAL with relative paths

From: Kory Maincent via buildroot <buildroot@buildroot.org>
To: buildroot@buildroot.org
Cc: Kory Maincent <kory.maincent@bootlin.com>,
	thomas.petazzoni@bootlin.com,
	Ricardo Martincoski <ricardo.martincoski@datacom.com.br>
Subject: [Buildroot] [PATCH] utils/docker-run: Support BR2_EXTERNAL with relative paths
Date: Mon, 15 Jun 2026 12:39:29 +0000	[thread overview]
Message-ID: <20260615123930.447-1-kory.maincent@bootlin.com> (raw)

The docker-run script did not handle the BR2_EXTERNAL environment variable,
preventing use of external trees in Docker builds.

Add support by converting relative paths to absolute, mounting the directory
into the container, and passing the variable to the Docker environment.

Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
---
 utils/docker-run | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/utils/docker-run b/utils/docker-run
index 27c169db72..6e9693edd6 100755
--- a/utils/docker-run
+++ b/utils/docker-run
@@ -97,6 +97,12 @@ if [ "${BR2_DL_DIR}" ]; then
     docker_opts+=( --env BR2_DL_DIR )
 fi
 
+if [ "${BR2_EXTERNAL}" ]; then
+    BR2_EXTERNAL_DIR="$(cd "${MAIN_DIR}"; readlink -e "${BR2_EXTERNAL}")"
+    mountpoints+=( "${BR2_EXTERNAL_DIR}" )
+    docker_opts+=( --env BR2_EXTERNAL )
+fi
+
 # shellcheck disable=SC2013 # can't use while-read because of the assignment
 for dir in $(printf '%s\n' "${mountpoints[@]}" |LC_ALL=C sort -u); do
     docker_opts+=( --mount "type=bind,src=${dir},dst=${dir}" )
-- 
2.43.0

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