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 <ub...@ilbers.de>
---
meta/classes/deb-dl-dir.bbclass | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/meta/classes/deb-dl-dir.bbclass b/meta/classes/deb-dl-dir.bbclass
index 42542d74..3c489a7b 100644
--- a/meta/classes/deb-dl-dir.bbclass
+++ b/meta/classes/deb-dl-dir.bbclass
@@ -51,8 +51,15 @@ 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}" )"
+ # Get source package name if available, fallback to package name
+ local src="$( dpkg-deb --field "${package}" Source | awk '{printf $1}' )"
+ [ -z "$src" ] && src="$( dpkg-deb --field "${package}" Package )"
+ # Get source package version if available, fallback to package version
+ local version="$( dpkg-deb --field "${package}" Source | awk '{gsub(/[()]/,""); printf $2}')"
+ [ -z "$version" ] && version="$( dpkg-deb --field "${package}" Version )"
+ # TODO: get back to the code below when debian bug #1004372 is fixed
+ # local src="$( dpkg-deb --show --showformat '${source:Package}' "${package}" )"
+ # local version="$( dpkg-deb --show --showformat '${source:Version}' "${package}" )"
local dscfile=$(find "${DEBSRCDIR}"/"${rootfs_distro}" -name "${src}_${version}.dsc")
[ -n "$dscfile" ] && continue

--
2.20.1