[PATCH v2] opencv: abort configure if we need to download

[PATCH v2] opencv: abort configure if we need to download

[Ross Burton]

OpenCV's habit of downloading files during do_configure is bad form
(as it becomes impossible to do offline builds), so add an option to
error out if a download would be needed.

Signed-off-by: Ross Burton <ross.burton@intel.com>
---
 .../opencv/opencv/download.patch              | 32 +++++++++++++++++++
 .../recipes-support/opencv/opencv_4.1.0.bb    |  2 ++
 2 files changed, 34 insertions(+)
 create mode 100644 meta-oe/recipes-support/opencv/opencv/download.patch

diff --git a/meta-oe/recipes-support/opencv/opencv/download.patch b/meta-oe/recipes-support/opencv/opencv/download.patch
new file mode 100644
index 0000000000..fa8db88078
--- /dev/null
+++ b/meta-oe/recipes-support/opencv/opencv/download.patch
@@ -0,0 +1,32 @@
+This CMake module will download files during do_configure.  This is bad as it
+means we can't do offline builds.
+
+Add an option to disallow downloads by emitting a fatal error.
+
+Upstream-Status: Pending
+Signed-off-by: Ross Burton <ross.burton@intel.com>
+
+diff --git a/cmake/OpenCVDownload.cmake b/cmake/OpenCVDownload.cmake
+index cdc47ad2cb..74573f45a2 100644
+--- a/cmake/OpenCVDownload.cmake
++++ b/cmake/OpenCVDownload.cmake
+@@ -14,6 +14,7 @@
+ #    RELATIVE_URL - if set, then URL is treated as a base, and FILENAME will be appended to it
+ #  Note: uses OPENCV_DOWNLOAD_PATH folder as cache, default is <opencv>/.cache
+ 
++set(OPENCV_ALLOW_DOWNLOADS ON CACHE BOOL "Allow downloads")
+ set(HELP_OPENCV_DOWNLOAD_PATH "Cache directory for downloaded files")
+ if(DEFINED ENV{OPENCV_DOWNLOAD_PATH})
+   set(OPENCV_DOWNLOAD_PATH "$ENV{OPENCV_DOWNLOAD_PATH}" CACHE PATH "${HELP_OPENCV_DOWNLOAD_PATH}")
+@@ -153,6 +154,11 @@ function(ocv_download)
+ 
+   # Download
+   if(NOT EXISTS "${CACHE_CANDIDATE}")
++    if(NOT OPENCV_ALLOW_DOWNLOADS)
++      message(FATAL_ERROR "Not going to download ${DL_FILENAME}")
++      return()
++    endif()
++
+     ocv_download_log("#cmake_download \"${CACHE_CANDIDATE}\" \"${DL_URL}\"")
+     file(DOWNLOAD "${DL_URL}" "${CACHE_CANDIDATE}"
+          INACTIVITY_TIMEOUT 60
diff --git a/meta-oe/recipes-support/opencv/opencv_4.1.0.bb b/meta-oe/recipes-support/opencv/opencv_4.1.0.bb
index 03e4f58dca..f679ccb05f 100644
--- a/meta-oe/recipes-support/opencv/opencv_4.1.0.bb
+++ b/meta-oe/recipes-support/opencv/opencv_4.1.0.bb
@@ -48,6 +48,7 @@ SRC_URI = "git://github.com/opencv/opencv.git;name=opencv \
            file://0003-To-fix-errors-as-following.patch \
            file://0001-Temporarliy-work-around-deprecated-ffmpeg-RAW-functi.patch \
            file://0001-Dont-use-isystem.patch \
+           file://download.patch \
            "
 PV = "4.1.0"
 
@@ -87,6 +88,7 @@ EXTRA_OECMAKE = "-DOPENCV_EXTRA_MODULES_PATH=${WORKDIR}/contrib/modules \
     -DIPPROOT=${WORKDIR}/ippicv_lnx \
     -DOPENCV_GENERATE_PKGCONFIG=ON \
     -DOPENCV_DOWNLOAD_PATH=${OPENCV_DLDIR} \
+    -DOPENCV_ALLOW_DOWNLOADS=OFF \
     ${@bb.utils.contains("TARGET_CC_ARCH", "-msse3", "-DENABLE_SSE=1 -DENABLE_SSE2=1 -DENABLE_SSE3=1 -DENABLE_SSSE3=1", "", d)} \
     ${@bb.utils.contains("TARGET_CC_ARCH", "-msse4.1", "-DENABLE_SSE=1 -DENABLE_SSE2=1 -DENABLE_SSE3=1 -DENABLE_SSSE3=1 -DENABLE_SSE41=1", "", d)} \
     ${@bb.utils.contains("TARGET_CC_ARCH", "-msse4.2", "-DENABLE_SSE=1 -DENABLE_SSE2=1 -DENABLE_SSE3=1 -DENABLE_SSSE3=1 -DENABLE_SSE41=1 -DENABLE_SSE42=1", "", d)} \
-- 
2.20.1