diff options
| -rw-r--r-- | gnu/build/linux-modules.scm | 52 |
1 files changed, 51 insertions, 1 deletions
diff --git a/gnu/build/linux-modules.scm b/gnu/build/linux-modules.scm index 9b9fc0d9d8..a73ccaf511 100644 --- a/gnu/build/linux-modules.scm +++ b/gnu/build/linux-modules.scm @@ -51,7 +51,8 @@ matching-modules missing-modules - write-module-alias-database)) + write-module-alias-database + write-module-device-database)) ;;; Commentary: ;;; @@ -507,4 +508,53 @@ are required to access DEVICE." aliases))) aliases)))) +(define (aliases->device-tuple aliases) + "Traverse ALIASES, a list of module aliases, and search for +\"char-major-M-N\", \"block-major-M-N\", or \"devname:\" aliases. When they +are found, return a tuple (DEVNAME TYPE MAJOR MINOR), otherwise return #f." + (define (char/block-major? alias) + (or (string-prefix? "char-major-" alias) + (string-prefix? "block-major-" alias))) + + (define (char/block-major->tuple alias) + (match (string-tokenize alias %not-dash) + ((type "major" (= string->number major) (= string->number minor)) + (list (match type + ("char" "c") + ("block" "b")) + major minor)))) + + (let* ((devname (any (lambda (alias) + (and (string-prefix? "devname:" alias) + (string-drop alias 8))) + aliases)) + (major/minor (match (find char/block-major? aliases) + (#f #f) + (str (char/block-major->tuple str))))) + (and devname major/minor + (cons devname major/minor)))) + +(define %not-dash + (char-set-complement (char-set #\-))) + +(define (write-module-device-database directory) + "Traverse the '.ko' files in DIRECTORY and create the corresponding +'modules.devname' file. This file contains information about modules that can +be loaded on-demand, such as file system modules." + (define aliases + (filter-map (lambda (file) + (match (aliases->device-tuple (module-aliases file)) + (#f #f) + (tuple (cons (file-name->module-name file) tuple)))) + (find-files directory "\\.ko$"))) + + (call-with-output-file (string-append directory "/modules.devname") + (lambda (port) + (display "# Device nodes to trigger on-demand module loading.\n" port) + (for-each (match-lambda + ((module devname type major minor) + (format port "~a ~a ~a~a:~a~%" + module devname type major minor))) + aliases)))) + ;;; linux-modules.scm ends here |