[PATCH] kbuild: deb-pkg: Do request initrd for user-mode-linux

[Nicolas Schier]

Do not request initramfs-tools to build an initrd image for
user-mode-linux.

Building and installing a user-mode-linux Debian package with

    make bindeb-pkg ARCH=um
    apt install ./user-mode-linux-*.deb

fails reasonable due to missing kernel config in /boot
(KVER=6.13.0-rc2-00006-g8f2db654f79c):

    update-initramfs: Generating /usr/bin/initrd.img-${KVER}
    grep: /boot/config-${KVER}: No such file or directory
    W: zstd compression (CONFIG_RD_ZSTD) not supported by kernel, using
     gzip
    grep: /boot/config-${KVER}: No such file or directory
    E: gzip compression (CONFIG_RD_GZIP) not supported by kernel
    update-initramfs: failed for /usr/bin/initrd.img-${KVER} with 1.
    run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return
     code 1
    ...
    dpkg: error processing package user-mode-linux-${KVER} (--configure):
     installed user-mode-linux-${KVER} package post-installation script
     subprocess returned error exit status 1
    Errors were encountered while processing:
     user-mode-linux-${KVER}
    E: Sub-process /usr/bin/dpkg returned an error code (1)

There is no need to build initrd for user-mode-linux, so stop requesting
it.

Signed-off-by: Nicolas Schier <nicolas@xxxxxxxxx>
---
 scripts/package/builddeb | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/scripts/package/builddeb b/scripts/package/builddeb
index b497b933901013b1b8b82c2c340a88c9257c6193..d88ee487a1f2cfa3365350abe5b2203f48980d36 100755
--- a/scripts/package/builddeb
+++ b/scripts/package/builddeb
@@ -46,10 +46,12 @@ install_linux_image () {
 		cp System.map "${pdir}/usr/lib/uml/modules/${KERNELRELEASE}/System.map"
 		cp ${KCONFIG_CONFIG} "${pdir}/usr/share/doc/${pname}/config"
 		gzip "${pdir}/usr/share/doc/${pname}/config"
+		initrd_wanted=No
 	else
 		mkdir -p "${pdir}/boot"
 		cp System.map "${pdir}/boot/System.map-${KERNELRELEASE}"
 		cp ${KCONFIG_CONFIG} "${pdir}/boot/config-${KERNELRELEASE}"
+		initrd_wanted=$(if_enabled_echo CONFIG_BLK_DEV_INITRD Yes No)
 	fi
 
 	# Not all arches have the same installed path in debian
@@ -82,7 +84,7 @@ install_linux_image () {
 		export DEB_MAINT_PARAMS="\$*"
 
 		# Tell initramfs builder whether it's wanted
-		export INITRD=$(if_enabled_echo CONFIG_BLK_DEV_INITRD Yes No)
+		export INITRD=${initrd_wanted}
 
 		# run-parts will error out if one of its directory arguments does not
 		# exist, so filter the list of hook directories accordingly.

---
base-commit: 8f2db654f79c7fa579c64eda2b5db44553d6e513
change-id: 20241212-kbuild-deb-pkg-no-initrd-for-um-1c7b9ab2f264

Best regards,
-- 
Nicolas