Skip tests that run rofiles-fuse if /dev/fuse or /etc/mtab unavailable

Signed-off-by: Simon McVittie <smcv@debian.org>

Closes: #232
Approved by: cgwalters

tests/libtest.sh

@@ -332,3 +332,20 @@ skip_without_user_xattrs () {
         exit 0
     fi
 }
+
+skip_without_fuse () {
+    if ! fusermount --version >/dev/null 2>&1; then
+        echo "1..0 # SKIP no fusermount"
+        exit 0
+    fi
+
+    if ! [ -w /dev/fuse ]; then
+        echo "1..0 # SKIP no write access to /dev/fuse"
+        exit 0
+    fi
+
+    if ! [ -e /etc/mtab ]; then
+        echo "1..0 # SKIP no /etc/mtab"
+        exit 0
+    fi
+}

tests/test-demo-buildsystem.sh

@@ -19,13 +19,9 @@
 
 set -euo pipefail
 
-if ! fusermount --version >/dev/null 2>&1; then
-    echo "1..0 # SKIP no fusermount"
-    exit 0
-fi
-
 . $(dirname $0)/libtest.sh
 
+skip_without_fuse
 skip_without_user_xattrs
 
 echo "1..1"

tests/test-rofiles-fuse.sh

@@ -19,13 +19,9 @@
 
 set -euo pipefail
 
-if ! fusermount --version >/dev/null 2>&1; then
-    echo "1..0 # SKIP no fusermount"
-    exit 0
-fi
-
 . $(dirname $0)/libtest.sh
 
+skip_without_fuse
 skip_without_user_xattrs
 
 setup_test_repository "bare-user"