[PATCH v6 07/12] sbuild: support of shell exports from dpkg_runbuild_prepend

[Uladzimir Bely <ubely@ilbers.de>]

Many of recipes often use shell exports done in dpkg_run_prepend.

While sbuild is performed in isolated environment, we need a way to pass
these exported variables to it. This is done by storing environment just
before dpkg_runbuild (after prepare_build) and finding just before
the actual build what has been changed or added.

This patch allows using shell exports, but warning will be produced.
It's recommended to modify the code (in downstreams) and replace shell
exports by other methods, like using templates.

Signed-off-by: Uladzimir Bely <ubely@ilbers.de>
---
 meta/classes/dpkg.bbclass | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/meta/classes/dpkg.bbclass b/meta/classes/dpkg.bbclass
index 5511de64..82a722df 100644
--- a/meta/classes/dpkg.bbclass
+++ b/meta/classes/dpkg.bbclass
@@ -32,6 +32,12 @@ do_install_builddeps[lockfiles] += "${REPO_ISAR_DIR}/isar.lock"
 
 addtask devshell after do_install_builddeps
 
+DPKG_PREBUILD_ENV_FILE="${WORKDIR}/dpkg_prebuild.env"
+
+do_prepare_build_append() {
+    env > ${DPKG_PREBUILD_ENV_FILE}
+}
+
 # Build package from sources using build script
 dpkg_runbuild() {
     E="${@ isar_export_proxies(d)}"
@@ -40,6 +46,27 @@ dpkg_runbuild() {
     export DEB_BUILD_PROFILES="${@ isar_deb_build_profiles(d)}"
     export PARALLEL_MAKE="${PARALLEL_MAKE}"
 
+    env | while read -r line; do
+        # Filter the same lines
+        grep -q "^${line}" ${DPKG_PREBUILD_ENV_FILE} && continue
+        # Filter some standard variables
+        echo ${line} | grep -q "^HOME=" && continue
+        echo ${line} | grep -q "^PWD=" && continue
+
+        var=$(echo "${line}" | cut -d '=' -f1)
+        value=$(echo "${line}" | cut -d '=' -f2-)
+        sbuild_export $var "$value"
+
+        # Don't warn some variables
+        [ "${var}" = "PARALLEL_MAKE" ] && continue
+        [ "${var}" = "CCACHE_DIR" ] && continue
+        [ "${var}" = "PATH_PREPEND" ] && continue
+        [ "${var}" = "DEB_BUILD_OPTIONS" ] && continue
+        [ "${var}" = "DEB_BUILD_PROFILES" ] && continue
+
+        bbwarn "Export of '${line}' detected, please migrate to templates"
+    done
+
     profiles=$(grep "DEB_BUILD_PROFILES" ${SBUILD_CONFIG} | tail -n1 | cut -d "'" -f 4)
     if [ ${ISAR_CROSS_COMPILE} -eq 1 ]; then
         profiles="${profiles} cross nocheck"
-- 
2.20.1