kernel: Unshallow the repo in Makefile. close #1365

kernel/Makefile

@@ -14,7 +14,7 @@ obj-y += kernel_compat.o
 obj-y += selinux/
 # .git is a text file while the module is imported by 'git submodule add'.
 ifeq ($(shell test -e $(srctree)/$(src)/../.git; echo $$?),0)
-KSU_GIT_VERSION := $(shell cd $(srctree)/$(src); /usr/bin/env PATH="$$PATH":/usr/bin:/usr/local/bin git rev-list --count HEAD)
+KSU_GIT_VERSION := $(shell cd $(srctree)/$(src); /usr/bin/env PATH="$$PATH":/usr/bin:/usr/local/bin [ -f ../.git/shallow ] && git fetch --unshallow; git rev-list --count HEAD)
 # ksu_version: major * 10000 + git version + 200 for historical reasons
 $(eval KSU_VERSION=$(shell expr 10000 + $(KSU_GIT_VERSION) + 200))
 $(info -- KernelSU version: $(KSU_VERSION))