[PATCH] kbuild: check for /sbin/depmod installed

[Randy Dunlap]

From: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>

Verify that 'depmod' ($DEPMOD) is installed.
This is a partial revert of 620c231c7a7f (from 2012):
  ("kbuild: do not check for ancient modutils tools")

Fixes kernel bugzilla #198965:
https://bugzilla.kernel.org/show_bug.cgi?id=198965

Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Lucas De Marchi <lucas.demarchi@xxxxxxxxxxxxxx>
Cc: Michal Marek <michal.lkml@xxxxxxxxxxx>
Cc: Chih-Wei Huang <cwhuang@xxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # any kernel since 2012
---
 scripts/depmod.sh |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- lnx-418-rc2.orig/scripts/depmod.sh
+++ lnx-418-rc2/scripts/depmod.sh
@@ -10,10 +10,16 @@ fi
 DEPMOD=$1
 KERNELRELEASE=$2
 
-if ! test -r System.map -a -x "$DEPMOD"; then
+if ! test -r System.map ; then
 	exit 0
 fi
 
+if [ -z $(command -v $DEPMOD) ]; then
+	echo "'make *install' requires $DEPMOD. Please install it." >&2
+	echo "This is probably in the module-init-tools package." >&2
+	exit 1
+fi
+
 # older versions of depmod require the version string to start with three
 # numbers, so we cheat with a symlink here
 depmod_hack_needed=true