[PATCH 6.19 804/844] kbuild: rpm-pkg: Fix manual debuginfo generation when using .src.rpm

[Sasha Levin]

From: Nathan Chancellor <nathan@xxxxxxxxxx>

[ Upstream commit afdfb71c018e9a0aa2e51fb8186d3fb1acdd3f0e ]

Commit 62089b804895 ("kbuild: rpm-pkg: Generate debuginfo package
manually") added uses of OBJCOPY and READELF, variables from Kbuild.
These variables are defined and work properly when using the binrpm-pkg
target because rpmbuild is run within Kbuild. However, these variables
are not defined when building from a source RPM package generated with
the srcrpm-pkg target, breaking the build when generating the debug info
subpackage.

Define a default value for these variables so that these commands
respect the value from Kbuild but continue to work when built from a
source RPM package.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 62089b804895 ("kbuild: rpm-pkg: Generate debuginfo package manually")
Reported-by: Lukas Herbolt <lukas@xxxxxxxxxxx>
Closes: https://lore.kernel.org/20260212135855.147906-2-lukas@xxxxxxxxxxx/
Tested-by: Lukas Herbolt <lukas@xxxxxxxxxxx>
Link: https://patch.msgid.link/20260213-fix-debuginfo-srcrpm-pkg-v1-1-45cd0c0501b9@xxxxxxxxxx
Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 scripts/package/kernel.spec | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/scripts/package/kernel.spec b/scripts/package/kernel.spec
index af682a7054779..bccf58bdd45fd 100644
--- a/scripts/package/kernel.spec
+++ b/scripts/package/kernel.spec
@@ -148,11 +148,11 @@ echo /usr/lib/debug/lib/modules/%{KERNELRELEASE}/vmlinux > %{buildroot}/debuginf
 while read -r mod; do
 	mod="${mod%.o}.ko"
 	dbg="%{buildroot}/usr/lib/debug/lib/modules/%{KERNELRELEASE}/kernel/${mod}"
-	buildid=$("${READELF}" -n "${mod}" | sed -n 's@^.*Build ID: \(..\)\(.*\)@\1/\2@p')
+	buildid=$("${READELF:-readelf}" -n "${mod}" | sed -n 's@^.*Build ID: \(..\)\(.*\)@\1/\2@p')
 	link="%{buildroot}/usr/lib/debug/.build-id/${buildid}.debug"
 
 	mkdir -p "${dbg%/*}" "${link%/*}"
-	"${OBJCOPY}" --only-keep-debug "${mod}" "${dbg}"
+	"${OBJCOPY:-objcopy}" --only-keep-debug "${mod}" "${dbg}"
 	ln -sf --relative "${dbg}" "${link}"
 
 	echo "${dbg#%{buildroot}}" >> %{buildroot}/debuginfo.list
-- 
2.51.0