backports: add check_depmod to look for module search path

This backports project relies on you being able to update
your Linux distribution modules by looking at an updates
search path, if one is not found we update depmod to look
for the new path for you.

Signed-off-by: Luis R. Rodriguez <mcgrof@do-not-panic.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

2 files changed, 79 insertions, 1 deletions

diff --git a/backport/Makefile.real b/backport/Makefile.real
index d79aafc1..35a1fb34 100644
--- a/backport/Makefile.real
+++ b/backport/Makefile.real
@@ -89,12 +89,12 @@ install: modules
 		modules_install
 	@./scripts/blacklist.sh $(KLIB)/ $(KLIB)/$(KMODDIR)
 	@./scripts/compress_modules.sh $(KLIB)/$(KMODDIR)
+	@./scripts/check_depmod.sh
 	@/sbin/depmod -ae
 	@echo
 	@echo Your backported driver modules should be installed now.
 	@echo Try loading them with modprobe.
 	@echo
 # FIXME:
-#	check depmod
 #	install/load/unload/... scripts?
 #	compat firmware class udev stuff
diff --git a/backport/scripts/check_depmod.sh b/backport/scripts/check_depmod.sh
new file mode 100755
index 00000000..6123894a
--- /dev/null
+++ b/backport/scripts/check_depmod.sh
@@ -0,0 +1,78 @@
+#!/bin/bash
+# Copyright 2009-2013	Luis R. Rodriguez <mcgrof@do-not-panic.com>
+#
+# Ensures your distribution likes to prefer updates/ over the kernel/
+# search updates built-in
+
+# Seems Mandriva has an $DEPMOD_DIR but it doesn't have any files,
+# so lets deal with those distributions.
+DEPMOD_CONF="/etc/depmod.conf"
+DEPMOD_CONF_TMP="$DEPMOD_CONF.backports.old"
+DEPMOD_DIR="/etc/depmod.d/"
+BACKPORT_DEPMOD_FILE="backports.conf"
+GREP_REGEX_UPDATES="^[[:space:]]*search.*[[:space:]]updates\([[:space:]]\|$\)"
+GREP_REGEX_SEARCH="^[[:space:]]*search[[:space:]].\+$"
+DEPMOD_CMD="depmod"
+
+function add_compat_depmod_conf {
+	echo "NOTE: Your distribution lacks an $DEPMOD_DIR directory with "
+	echo "updates/ directory being prioritized for modules, we're adding "
+	echo "one for you."
+	mkdir -p $DEPMOD_DIR
+	FIRST_FILE=$(ls $DEPMOD_DIR|head -1)
+	[ -n "$FIRST_FILE" ] && while [[ $FIRST_FILE < $BACKPORT_DEPMOD_FILE ]]; do
+		BACKPORT_DEPMOD_FILE="0$BACKPORT_DEPMOD_FILE"
+	done
+	echo "search updates" > $DEPMOD_DIR/$BACKPORT_DEPMOD_FILE
+}
+
+function add_global_depmod_conf {
+	echo "NOTE: Your distribution lacks updates/ directory being"
+	echo "prioritized for modules, we're adding it to $DEPMOD_CONF."
+	rm -f $DEPMOD_CONF_TMP
+	[ -f $DEPMOD_CONF ] && cp -f $DEPMOD_CONF $DEPMOD_CONF_TMP
+	echo "search updates" > $DEPMOD_CONF
+	[ -f $DEPMOD_CONF_TMP ] && cat $DEPMOD_CONF_TMP >> $DEPMOD_CONF
+}
+
+function depmod_updates_ok {
+	echo "depmod will prefer updates/ over kernel/ -- OK!"
+}
+
+function add_depmod_conf {
+	if [ -f "$DEPMOD_CONF" ]; then
+		add_global_depmod_conf
+	else
+		DEPMOD_VERSION=$($DEPMOD_CMD --version | cut -d" " -f2 | sed "s/\.//")
+		if [[ $DEPMOD_VERSION -gt 36 ]]; then
+			add_compat_depmod_conf
+		else
+			add_global_depmod_conf
+		fi
+	fi
+}
+
+GREP_FILES=""
+[ -f $DEPMOD_CONF ] && GREP_FILES="$DEPMOD_CONF"
+if [ -d $DEPMOD_DIR ]; then
+	DEPMOD_FILE_COUNT=$(ls $DEPMOD_DIR | wc -l)
+	[[ $DEPMOD_FILE_COUNT -gt 0 ]] && GREP_FILES="$GREP_FILES $DEPMOD_DIR/*"
+fi
+
+if [ -n "$GREP_FILES" ]; then
+	grep -q "$GREP_REGEX_SEARCH" $GREP_FILES
+	if [[ $? -eq 0 ]]; then
+		grep -q "$GREP_REGEX_UPDATES" $GREP_FILES
+		if [[ $? -eq 0 ]]; then
+			depmod_updates_ok
+		else
+			add_depmod_conf
+		fi
+	else
+		depmod_updates_ok
+	fi
+else
+	depmod_updates_ok
+fi
+
+exit 0