d/TROUBLESHOOTING.Debian: Add section if device file system does not support ACLs

1 files changed, 16 insertions, 0 deletions

diff --git a/debian/TROUBLESHOOTING.Debian b/debian/TROUBLESHOOTING.Debian
index 917cfc6..397626f 100644
--- a/debian/TROUBLESHOOTING.Debian
+++ b/debian/TROUBLESHOOTING.Debian
@@ -1,5 +1,6 @@
 
 1.) usbfs: interface 1 claimed by usblp while ‘scanimage’ sets config #1
+2.) ACL: device file system does not support ACLs
 
 
 1.) usbfs: interface 1 claimed by usblp while ‘scanimage’ sets config #1
@@ -11,3 +12,18 @@ If you get this error meessage you can try
 and reboot. After that your scanner can used. 
 
 REMARK: Sometimes usblp is used to access your printer. 
+
+
+2.) ACL: device file system does not support ACLs
+
+From https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=789593
+
+The file /lib/udev/rules.d/60-libsane.rules uses the command "/bin/setfacl -m g:scanner:rw 
+$env{DEVNAME}" to add the "scanner" group with rw access to the device permissions.
+
+In my case, with /dev on an ext4 filesystem with no ACL support enabled in the kernel, setfacl 
+returns "Operation not supported". I assume this is because it's trying to add a group, which is not 
+possible in its fallback mode of traditional Unix-style file permissions.
+
+As a workaround, I have substituted "/bin/chown root:scanner $env{DEVNAME}" as the command at the 
+end of 60-libsane.rules (an alternative would be to use a UDEV rule element to change the ownership).