system: Add helper file-system-mount-point-predicate.

* gnu/system/file-systems.scm (file-system-mount-point-predicate): Add
it.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/gnu/system/file-systems.scm b/gnu/system/file-systems.scm
index e1d1fb72cca..437f8da8983 100644
--- a/gnu/system/file-systems.scm
+++ b/gnu/system/file-systems.scm
@@ -60,6 +60,7 @@
             file-system-location
 
             file-system-type-predicate
+            file-system-mount-point-predicate
             btrfs-subvolume?
             btrfs-store-subvolume-file-name
 
@@ -671,6 +672,12 @@ system has the given TYPE."
   (lambda (fs)
     (string=? (file-system-type fs) type)))
 
+(define (file-system-mount-point-predicate mount-point)
+  "Return a predicate that, when passed a file system, returns #t if that file
+system has the given MOUNT-POINT."
+  (lambda (fs)
+    (string=? (file-system-mount-point fs) mount-point)))
+
 
 ;;;
 ;;; Btrfs specific helpers.