Unmount the filesystem if the test fails halfway.

test.sh

@@ -2,31 +2,39 @@
 
 set -e
 
+dotest()
+{
+	cat testmnt.txt
+	head -c 20 testmnt.txt
+	tail -c 20 testmnt.txt
+	head -c 160 testmnt.txt | tail -n 1
+	echo
+
+	cnt1=`wc -c test1 | (read a b; echo "$a")`
+	if ! expr "x$cnt1" : 'x[0-9][0-9]*$' > /dev/null; then
+		echo 'Could not count the characters in the test1 file'
+		exit 1
+	fi
+	cnt2=`wc -c test2 | (read a b; echo "$a")`
+	if ! expr "x$cnt2" : 'x[0-9][0-9]*$' > /dev/null; then
+		echo 'Could not count the characters in the test1 file'
+		exit 1
+	fi
+	cnt3=`wc -c test3 | (read a b; echo "$a")`
+	if ! expr "x$cnt3" : 'x[0-9][0-9]*$' > /dev/null; then
+		echo 'Could not count the characters in the test1 file'
+		exit 1
+	fi
+
+	head -c "$cnt1" testmnt.txt | diff -u test1 -
+	tail -c "$cnt3" testmnt.txt | diff -u test3 -
+	cat test1 test2 test3 | diff -u - testmnt.txt
+}
+
+rm -f testmnt.txt
+res=0
 ./mount.sh
-cat testmnt.txt
-head -c 20 testmnt.txt
-tail -c 20 testmnt.txt
-head -c 160 testmnt.txt | tail -n 1
-echo
-
-cnt1=`wc -c test1 | (read a b; echo "$a")`
-if ! expr "x$cnt1" : 'x[0-9][0-9]*$' > /dev/null; then
-	echo 'Could not count the characters in the test1 file'
-	exit 1
-fi
-cnt2=`wc -c test2 | (read a b; echo "$a")`
-if ! expr "x$cnt2" : 'x[0-9][0-9]*$' > /dev/null; then
-	echo 'Could not count the characters in the test1 file'
-	exit 1
-fi
-cnt3=`wc -c test3 | (read a b; echo "$a")`
-if ! expr "x$cnt3" : 'x[0-9][0-9]*$' > /dev/null; then
-	echo 'Could not count the characters in the test1 file'
-	exit 1
-fi
-
-head -c "$cnt1" testmnt.txt | diff -u test1 -
-tail -c "$cnt3" testmnt.txt | diff -u test3 -
-cat test1 test2 test3 | diff -u - testmnt.txt
-
+(dotest) || res=$?
 ./umount.sh
+rm -f testmnt.txt
+exit "$res"