X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=extras%2Fscsi_id%2Fscsi_id.8;h=69dd2a998ada9ca4ab58df578c6a6be8c5ee984e;hp=a4fb881a058d040361152145269fb77602462047;hb=eb6c7cd03635ffc28798734f0b87b9e21dae6f9e;hpb=1bed1db4994aae37f4a11e90dabcd8b4e3592686

diff --git a/extras/scsi_id/scsi_id.8 b/extras/scsi_id/scsi_id.8
index a4fb881a0..69dd2a998 100644
--- a/extras/scsi_id/scsi_id.8
+++ b/extras/scsi_id/scsi_id.8
@@ -12,12 +12,12 @@ all SCSI devices that properly support page 0x80 or page 0x83.
 
 If a result is generated it is sent to standard output, and the program
 exits with a zero value. If no identifier is output, the program exits
-with a non-zero value.
+with a non\-zero value.
 
 \fBscsi_id\fP is primarily for use by other utilities such as \fBudev\fP
 that require a unique SCSI identifier.
 
-By default all devices are assume black listed, the \fB-g\fP option must
+By default all devices are assume black listed, the \fB\-g\fP option must
 be specified on the command line or in the config file for any useful
 behaviour.
 
@@ -50,27 +50,26 @@ identifier starts with the NAA value of 6):
 .fi
 .P
 
-
 .SH OPTIONS
 .TP
+.BI subsystem
+When called with only a single argument without a leading \-, runs in a hotplug
+mode, and expects the environment variable DEVPATH to specify the
+corresponding sysfs device. See section below on usage with \fBudev\fP.
+.TP
 .BI \-b
-The default behaviour - treat the device as black listed, and do nothing
-unless a white listed device is found in the scsi_id config-file.
+The default behaviour \- treat the device as black listed, and do nothing
+unless a white listed device is found in the scsi_id config\-file.
 .TP
 .BI \-d "\| device\^"
 Instead
 of determining and creating a device node based on a sysfs dev
-entry as done for the \fB-s\fP, send SG_IO commands to 
+entry as done for the \fB\-s\fP, send SG_IO commands to 
 \fBdevice\fP, such as \fB/dev/sdc\fP.
 .TP
-.BI \-e
-Send all output to standard error even if
-.B scsi_id 
-is running in hotplug mode.
-.TP
-.BI \-f "\| config-file"
+.BI \-f "\| config\-file"
 Read configuration and black/white list entries from
-.B config-file 
+.B config\-file 
 rather than the default
 .B /etc/scsi_id.config
 file.
@@ -90,9 +89,9 @@ Use SCSI INQUIRY VPD page code 0x80 or 0x83. The default behaviour is to
 query the available VPD pages, and use page 0x83 if found, else page 0x80
 if found, else nothing.
 .TP
-.BI \-s "\|sysfs-device"
+.BI \-s "\| sysfs\-device"
 Generate an id for the
-.B sysfs-device.
+.B sysfs\-device.
 The sysfs mount point must not be included. For example, use /block/sd,
 not /sys/block/sd.
 .TP
@@ -102,6 +101,37 @@ Generate verbose debugging output.
 .BI \-V
 Display version number and exit.
 .RE
+
+.SH USAGE WITH UDEV 
+If \fBscsi_id\fP is invoked with one argument without a leading \-, it
+assumes it is called for a hotplug event, and looks for the sysfs device
+in the DEVPATH environment variable. 
+
+This mode is used when run via the \fBudev\fP PROGRAM key. Passing any
+arguments or options as part of the PROGRAM rule breaks this assumption,
+and the results will likely not be as expected.
+
+When in this mode, all errors and warnings are sent via syslog.
+
+To determine the specific value needed in a RESULT key, use the \-s option,
+for example:
+
+.sp
+.nf
+/sbin/scsi_id -s /block/sda
+.fi
+.P
+
+An example \fBudev\fP rule using \fBscsi_id\fP, that will name a block
+device and any partitions for the device matching the \fBscsi_id\fP output
+of 312345:
+
+.sp
+.nf
+BUS="scsi", PROGRAM="/sbin/scsi_id", RESULT="312345", NAME="disk%n"
+.fi
+.P
+
 .SH "FILES"
 .nf
 .ft B
@@ -110,8 +140,7 @@ Display version number and exit.
 .fi
 .LP
 .SH "SEE ALSO"
-.BR udev (8)
-, especially the CALLOUT method.
+.BR udev (8), hotplug (8)
 .SH AUTHORS
 Developed by Patrick Mansfield <patmans@us.ibm.com> based on SCSI ID
 source included in earlier linux 2.5 kernels, sg_utils source, and SCSI