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kola/devcontainer: test building an out-of-tree kernel module #904

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42 changes: 41 additions & 1 deletion kola/tests/devcontainer/devcontainer.go
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Original file line number Diff line number Diff line change
Expand Up @@ -58,7 +58,47 @@ export FEATURES="-ipc-sandbox -network-sandbox"
emerge-gitclone
emerge --getbinpkg --verbose coreos-sources
zcat /proc/config.gz >/usr/src/linux/.config
exec make -C /usr/src/linux "-j$(nproc)" modules_prepare V=1
make -C /usr/src/linux "-j$(nproc)" modules_prepare V=1

# Verify that the developer container can actually build an out-of-tree
# kernel module against the prepared kernel tree, not just prepare the tree.
# See https://github.com/flatcar/Flatcar/issues/310.
#
# /var/tmp is used (rather than the default /tmp) because it is backed by
# disk here, mirroring the modules_prepare workdir - under qemu we might
# not have enough memory for a tmpfs.
module_dir="$(mktemp -d -p /var/tmp)"

cat >"${module_dir}/hello.c" <<'MODULE_EOF'
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>

static int __init hello_init(void)
{
pr_info("flatcar out-of-tree module test: loaded\n");
return 0;
}

static void __exit hello_exit(void)
{
pr_info("flatcar out-of-tree module test: unloaded\n");
}

module_init(hello_init);
module_exit(hello_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Flatcar out-of-tree kernel module build test");
MODULE_EOF

cat >"${module_dir}/Kbuild" <<'KBUILD_EOF'
obj-m := hello.o
KBUILD_EOF

make -C /usr/src/linux "-j$(nproc)" M="${module_dir}" modules V=1

# The build must have produced a loadable, non-empty module object.
test -s "${module_dir}/hello.ko"
`)

scriptPrologTemplate = util.TrimLeftSpace(`
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