[PATCH v2 1/1] deb-dl-dir: Use dpkg-deb --field in debsrc_download

[Uladzimir Bely <ubely@ilbers.de>]

In Debian >= bullseye 'dpkg-deb --show --showformat' is currently broken
in case of requesting virtual fields like 'source:<FieldName>'.
This makes function 'debsrc_download' broken, so build fails when
BASE_REPO_FEATURES ?= "cache-deb-src" is enabled in local.conf

The regression came with the fix for bug #972580 in Debian.
The issue is reported to Debian bugtracker as bug #1004372.

Signed-off-by: Uladzimir Bely <ubely@ilbers.de>
---
 meta/classes/deb-dl-dir.bbclass | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/meta/classes/deb-dl-dir.bbclass b/meta/classes/deb-dl-dir.bbclass
index 42542d74..6bb8bf64 100644
--- a/meta/classes/deb-dl-dir.bbclass
+++ b/meta/classes/deb-dl-dir.bbclass
@@ -51,8 +51,14 @@ debsrc_download() {
     printenv | grep -q BB_VERBOSE_LOGS && set -x
     find "${rootfs}/var/cache/apt/archives/" -maxdepth 1 -type f -iname '*\.deb' | while read package; do
         is_not_part_of_current_build "${package}" && continue
-        local src="$( dpkg-deb --show --showformat '${source:Package}' "${package}" )"
-        local version="$( dpkg-deb --show --showformat '${source:Version}' "${package}" )"
+        local src="$( dpkg-deb --field "${package}" Source | awk '{printf $1}' )"
+        if [ -z "$src" ]; then
+            src="$( dpkg-deb --field "${package}" Package )"
+        fi
+        local version="$( dpkg-deb --field "${package}" Source |  awk '{gsub(/[()]/,""); printf $2}')"
+        if [ -z "$version" ]; then
+            version="$( dpkg-deb --field "${package}" Version )"
+        fi
         local dscfile=$(find "${DEBSRCDIR}"/"${rootfs_distro}" -name "${src}_${version}.dsc")
         [ -n "$dscfile" ] && continue
 
-- 
2.20.1