2 files changed, 39 insertions, 3 deletions
diff --git a/gnu/build/file-systems.scm b/gnu/build/file-systems.scm
index e3369d8521..c468144170 100644
--- a/gnu/build/file-systems.scm
+++ b/gnu/build/file-systems.scm
@@ -42,6 +42,10 @@
             find-partition-by-luks-uuid
             canonicalize-device-spec
 
+            read-partition-label
+            read-partition-uuid
+            read-luks-partition-uuid
+
             bind-mount
 
             mount-flags->bit-mask
@@ -435,6 +439,12 @@ partition field reader that returned a value."
 (define read-partition-uuid
   (cut read-partition-field <> %partition-uuid-readers))
 
+(define luks-partition-field-reader
+  (partition-field-reader read-luks-header luks-header-uuid))
+
+(define read-luks-partition-uuid
+  (cut read-partition-field <> (list luks-partition-field-reader)))
+
 (define (partition-predicate reader =)
   "Return a predicate that returns true if the FIELD of partition header that
 was READ is = to the given value."
@@ -451,9 +461,7 @@ was READ is = to the given value."
   (partition-predicate read-partition-uuid uuid=?))
 
 (define luks-partition-uuid-predicate
-  (partition-predicate
-   (partition-field-reader read-luks-header luks-header-uuid)
-   uuid=?))
+  (partition-predicate luks-partition-field-reader uuid=?))
 
 (define (find-partition predicate)
   "Return the first partition found that matches PREDICATE, or #f if none
diff --git a/gnu/build/linux-modules.scm b/gnu/build/linux-modules.scm
index 2d81175041..d69bcbf5a2 100644
--- a/gnu/build/linux-modules.scm
+++ b/gnu/build/linux-modules.scm
@@ -33,6 +33,7 @@
             ensure-dot-ko
             module-aliases
             module-dependencies
+            module-soft-dependencies
             normalize-module-name
             file-name->module-name
             find-module-file
@@ -100,6 +101,33 @@ contains module names, not actual file names."
       (('depends . what)
        (string-tokenize what %not-comma)))))
 
+(define not-softdep-whitespace
+  (char-set-complement (char-set #\space #\tab)))
+
+(define (module-soft-dependencies file)
+  "Return a list of (cons section soft-dependency) of module FILE."
+  ;; TEXT: "pre: baz blubb foo post: bax bar"
+  (define (parse-softdep text)
+    (let loop ((value '())
+               (tokens (string-tokenize text not-softdep-whitespace))
+               (section #f))
+      (match tokens
+       ((token rest ...)
+        (if (string=? (string-take-right token 1) ":") ; section
+            (loop value rest (string-trim-both (string-drop-right token 1)))
+            (loop (cons (cons section token) value) rest section)))
+       (()
+        value))))
+
+  ;; Note: Multiple 'softdep sections are allowed.
+  (let ((info (modinfo-section-contents file)))
+    (concatenate
+     (filter-map (match-lambda
+                  (('softdep . value)
+                   (parse-softdep value))
+                  (_ #f))
+                 (modinfo-section-contents file)))))
+
 (define (module-aliases file)
   "Return the list of aliases of module FILE."
   (let ((info (modinfo-section-contents file)))