03/03: file-systems: Handle EIO error in 'ENOENT-safe' as well.

[Ludovic Courtès]

civodul pushed a commit to branch master
in repository guix.

commit b53510e0d09d8c550a123fdca8467ff325c6f68a
Author: Adam Van Ymeren <address@hidden>
Date:   Sun Jun 11 13:01:31 2017 -0400

    file-systems: Handle EIO error in 'ENOENT-safe' as well.
    
    Trying to boot GuixSD when an audio CD is in the drive will die with an
    "input/output error" when trying to read the superblock from the cd
    drive.
    
    This patch catches and warns in this case rather than dying.
    
    * gnu/build/file-systems.scm (ENOENT-safe): Handle EIO.
    
    Signed-off-by: Ludovic Courtès <address@hidden>
---
 gnu/build/file-systems.scm | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gnu/build/file-systems.scm b/gnu/build/file-systems.scm
index 08f7d47..f9cc408 100644
--- a/gnu/build/file-systems.scm
+++ b/gnu/build/file-systems.scm
@@ -419,6 +419,10 @@ warning and #f as the result."
                  #f)
                 ((= ENOMEDIUM errno)              ;for removable media
                  #f)
+                ((= EIO errno)                    ;unreadable hardware like 
audio CDs
+                 (format (current-error-port)
+                         "warning: failed to read from device '~a'~%" device)
+                 #f)
                 (else
                  (apply throw args))))))))