When we are searching for changes in rootfiles, we walk through each
file that we have found in the build and check if it exists in the
rootfile. That check interpreted filenames as regular expressions which
caused a problem in the case of "/usr/bin/[".

This patch changes that grep will only search for an exact string match
(-F) and the string must be the entire line (-x).

Signed-off-by: Michael Tremer <michael.tremer(a)ipfire.org>
---
 lfs/Config | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lfs/Config b/lfs/Config
index 1a59ebe1e..8547f69c6 100644
--- a/lfs/Config
+++ b/lfs/Config
@@ -292,13 +292,13 @@ define POSTBUILD
 		fi; \
 		sed -e "s/BUILDTARGET/$(BUILDTARGET)/g" -e "s/KVER/$(KVER)/g" -e "s/xxxMACHINExxx/$(BUILD_ARCH)/g" $$ROOTFILE > $(TARGET)_rootfile; \
 		while read -r line; do \
-			if grep -qG "^#$$line$$" $(TARGET)_rootfile; then echo "#$$line" >> $(TARGET); \
-			elif grep -qG "^$$line$$" $(TARGET)_rootfile ; then echo "$$line" >> $(TARGET); \
+			if grep -qFx "#$$line" $(TARGET)_rootfile; then echo "#$$line" >> $(TARGET); \
+			elif grep -qFx "$$line" $(TARGET)_rootfile ; then echo "$$line" >> $(TARGET); \
 			else echo "+$$line" >> $(TARGET); \
 			fi; \
 		done < $(TARGET)_diff; \
 		grep -v "^#" $(TARGET)_rootfile | while read -r line; do \
-			if ! grep -qG "^$$line$$" $(TARGET)_diff ; then echo "-$$line" >> $(TARGET); \
+			if ! grep -qFx "$$line" $(TARGET)_diff ; then echo "-$$line" >> $(TARGET); \
 			fi; \
 		done; \
 		rm -f $(TARGET)_rootfile; \
-- 
2.39.5