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authorLudovic Courtès <ludo@gnu.org>2014-11-10 18:14:20 +0100
committerLudovic Courtès <ludo@gnu.org>2014-11-10 22:42:14 +0100
commitccea821befc96a2c5e0c64b1a18eef0f31abe0a7 (patch)
tree96eb82811452b7762690ef6fa90cbc393a4e2348
parent7eda0c567baf1505ba918539d2095e08f328b466 (diff)
syscalls: Add 'mount-points'.
* guix/build/syscalls.scm (mount-points): New procedure. * tests/syscalls.scm ("mount-points"): New test.
-rw-r--r--guix/build/syscalls.scm13
-rw-r--r--tests/syscalls.scm3
2 files changed, 16 insertions, 0 deletions
diff --git a/guix/build/syscalls.scm b/guix/build/syscalls.scm
index 7e5245fcc6..9765820836 100644
--- a/guix/build/syscalls.scm
+++ b/guix/build/syscalls.scm
@@ -31,6 +31,7 @@
MS_MOVE
mount
umount
+ mount-points
swapon
swapoff
processes
@@ -166,6 +167,18 @@ constants from <sys/mount.h>."
(when update-mtab?
(remove-from-mtab target))))))
+(define (mount-points)
+ "Return the mounts points for currently mounted file systems."
+ (call-with-input-file "/proc/mounts"
+ (lambda (port)
+ (let loop ((result '()))
+ (let ((line (read-line port)))
+ (if (eof-object? line)
+ (reverse result)
+ (match (string-tokenize line)
+ ((source mount-point _ ...)
+ (loop (cons mount-point result))))))))))
+
(define swapon
(let* ((ptr (dynamic-func "swapon" (dynamic-link)))
(proc (pointer->procedure int ptr (list '* int))))
diff --git a/tests/syscalls.scm b/tests/syscalls.scm
index 161e036e19..d65ec82740 100644
--- a/tests/syscalls.scm
+++ b/tests/syscalls.scm
@@ -44,6 +44,9 @@
;; Both return values have been encountered in the wild.
(memv (system-error-errno args) (list EPERM ENOENT)))))
+(test-assert "mount-points"
+ (member "/" (mount-points)))
+
(test-assert "swapon, ENOENT/EPERM"
(catch 'system-error
(lambda ()