* Mount file systems until a fixpoint is reached.

* Work properly for loopback mounts.

svn path=/nixos/trunk/; revision=7453

upstart-jobs/filesystems.nix

@@ -23,6 +23,16 @@ script
     fsTypes=(${toString fsTypes})
     optionss=(${toString optionss})
 
+    newDevices=1
+
+    # If we mount any file system, we repeat this loop, because new
+    # mount opportunities may have become available (such as images
+    # for loopback mounts).
+    
+    while test -n \"$newDevices\"; do
+
+        newDevices=
+
         for ((n = 0; n < \${#mountPoints[*]}; n++)); do
             mountPoint=\${mountPoints[$n]}
             device=\${devices[$n]}
@@ -30,11 +40,19 @@ script
             options=\${optionss[$n]}
 
             # If $device is already mounted somewhere else, unmount it first.
-        prevMountPoint=$(cat /proc/mounts | grep \"^$device \" | sed 's|^[^ ]\\+ \\+\\([^ ]\\+\\).*|\\1|')
+            # !!! Note: we use /etc/mtab, not /proc/mounts, because mtab
+            # contains more accurate info when using loop devices.
+            prevMountPoint=$(
+                cat /etc/mtab \\
+                | grep \"^$device \" \\
+                | sed 's|^[^ ]\\+ \\+\\([^ ]\\+\\).*|\\1|' \\
+            )
 
             if test \"$prevMountPoint\" = \"$mountPoint\"; then
                  echo \"remounting $device on $mountPoint\"
-             ${utillinux}/bin/mount -t \"$fsType\" -o remount,\"$options\" \"$device\" \"$mountPoint\" || true
+                 ${utillinux}/bin/mount -t \"$fsType\" \\
+                     -o remount,\"$options\" \\
+                     \"$device\" \"$mountPoint\" || true
                  continue
             fi
 
@@ -45,8 +63,12 @@ script
 
             echo \"mounting $device on $mountPoint\"
 
-        mkdir -p \"$mountPoint\" || true
+            if ${utillinux}/bin/mount -t \"$fsType\" -o \"$options\" \"$device\" \"$mountPoint\"; then
-        ${utillinux}/bin/mount -t \"$fsType\" -o \"$options\" \"$device\" \"$mountPoint\" || true
+                newDevices=1
+            fi
+        
+        done
+
     done
 
 end script