linux-info.eclass: rework get_running_version

This function may fail if the version cannot be parsed from a Makefile
found by following the /lib/modules/${KV_FULL}/{source,build} symlinks.
Instead of failing, we should just split KV_FULL as a fallback.

Also, simplify the existance checks for the kernel Makefile; if we can't
find the kernel source directory, there is really no point in checking
for the kernel build directory. The latter will probably contain a
Makefile with no version information.

Bug: https://bugs.gentoo.org/811726
Signed-off-by: Mike Gilbert <floppym@gentoo.org>

1 files changed, 20 insertions, 27 deletions

diff --git a/eclass/linux-info.eclass b/eclass/linux-info.eclass
index 4e08949a3854..97f7b5c06a90 100644
--- a/eclass/linux-info.eclass
+++ b/eclass/linux-info.eclass
@@ -629,34 +629,27 @@ get_running_version() {
 		die "${FUNCNAME}() called on non-Linux system, please fix the ebuild"
 	fi
 
-	KV_FULL=$(uname -r)
-
-	if [[ -f ${ROOT%/}/lib/modules/${KV_FULL}/source/Makefile && -f ${ROOT%/}/lib/modules/${KV_FULL}/build/Makefile ]]; then
-		KERNEL_DIR=$(readlink -f ${ROOT%/}/lib/modules/${KV_FULL}/source)
-		KBUILD_OUTPUT=$(readlink -f ${ROOT%/}/lib/modules/${KV_FULL}/build)
-		unset KV_FULL
-		get_version
-		return $?
-	elif [[ -f ${ROOT%/}/lib/modules/${KV_FULL}/source/Makefile ]]; then
-		KERNEL_DIR=$(readlink -f ${ROOT%/}/lib/modules/${KV_FULL}/source)
-		unset KV_FULL
-		get_version
-		return $?
-	elif [[ -f ${ROOT%/}/lib/modules/${KV_FULL}/build/Makefile ]]; then
-		KERNEL_DIR=$(readlink -f ${ROOT%/}/lib/modules/${KV_FULL}/build)
-		unset KV_FULL
-		get_version
-		return $?
-	else
-		# This handles a variety of weird kernel versions.  Make sure to update
-		# tests/linux-info_get_running_version.sh if you want to change this.
-		local kv_full=${KV_FULL//[-+_]*}
-		KV_MAJOR=$(ver_cut 1 ${kv_full})
-		KV_MINOR=$(ver_cut 2 ${kv_full})
-		KV_PATCH=$(ver_cut 3 ${kv_full})
-		KV_EXTRA="${KV_FULL#${KV_MAJOR}.${KV_MINOR}${KV_PATCH:+.${KV_PATCH}}}"
-		: ${KV_PATCH:=0}
+	local kv=$(uname -r)
+
+	if [[ -f ${ROOT%/}/lib/modules/${kv}/source/Makefile ]]; then
+		KERNEL_DIR=$(readlink -f "${ROOT%/}/lib/modules/${kv}/source")
+		if [[ -f ${ROOT%/}/lib/modules/${kv}/build/Makefile ]]; then
+			KBUILD_OUTPUT=$(readlink -f "${ROOT%/}/lib/modules/${kv}/build")
+		fi
+		get_version && return 0
 	fi
+
+	KV_FULL=${kv}
+
+	# This handles a variety of weird kernel versions.  Make sure to update
+	# tests/linux-info_get_running_version.sh if you want to change this.
+	local kv_full=${KV_FULL//[-+_]*}
+	KV_MAJOR=$(ver_cut 1 ${kv_full})
+	KV_MINOR=$(ver_cut 2 ${kv_full})
+	KV_PATCH=$(ver_cut 3 ${kv_full})
+	KV_EXTRA="${KV_FULL#${KV_MAJOR}.${KV_MINOR}${KV_PATCH:+.${KV_PATCH}}}"
+	: ${KV_PATCH:=0}
+
 	return 0
 }