[PATCH v1 05/15] packages: roms: download: fix missing qemu-img.

[Denis 'GNUtoo' Carikli]

Without that fix we have the following build error on Trisquel when
qemu-utils is not installed:
    successfully built /gnu/store/[...]-gnuboot-trisquel-preseed.img-07-2024.drv
    resources/packages/roms/download: line 175: qemu-img: command not found
    make: *** [Makefile:713: release] Error 127

An option would be to make sure that the host has qemu_img by adding
its corresponding packages in resources/dependencies/ and to check for
it in configure.ac, but since we already build the qemu with Guix,
it's easier to just reuse that, and this also gives us less
maintenance in the long run.

This was broken by the commit 9cc02ddde1e164fabfbddc8bbd3832ef9468d92d
("packages: roms: Start adding automatic tests.").

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
---
 resources/packages/roms/download | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/resources/packages/roms/download b/resources/packages/roms/download
index cea77df..ae52fe0 100755
--- a/resources/packages/roms/download
+++ b/resources/packages/roms/download
@@ -139,15 +139,26 @@ build_trisquel_rootfs_img()
 
 return_guix_qemu_x86_64()
 {
-    img_install_path="bin/qemu-system-x86_64"
+    qemu_install_path="bin/qemu-system-x86_64"
     # Guix produces 3 qemu outputs: one for the docs, one for the
     # static version, and one for all the rest.
     pkg_path="$(build_guix_qemu_x86_64 | \
                 grep -v '\-doc$' | grep -v '\-static$')"
-    qemu_path="${pkg_path}/${img_install_path}"
+    qemu_path="${pkg_path}/${qemu_install_path}"
     echo "${qemu_path}"
 }
 
+return_guix_qemu_img()
+{
+    qemu_img_install_path="bin/qemu-img"
+    # Guix produces 3 qemu outputs: one for the docs, one for the
+    # static version, and one for all the rest.
+    pkg_path="$(build_guix_qemu_x86_64 | \
+                grep -v '\-doc$' | grep -v '\-static$')"
+    qemu_img_path="${pkg_path}/${qemu_img_install_path}"
+    echo "${qemu_img_path}"
+}
+
 return_trisquel_preseed_x86_64_img()
 {
     img_install_path="share/trisquel-installer/preseed.img"
@@ -172,7 +183,8 @@ return_trisquel_rootfs_img()
     cp "${preseed_x86_64_img}" preseed.img
     chmod 770 preseed.img
 
-    qemu-img "create" "-f" "raw" "rootfs.img" "4.1G"
+    qemu_img="$(return_guix_qemu_img)"
+    "${qemu_img}" "create" "-f" "raw" "rootfs.img" "4.1G"
 
     extra_qemu_args=""
     if [ "${kvm}" = "yes" ] ; then
-- 
2.46.0