X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=extras%2Fscsi_id%2Fscsi_id.8;h=26df0d3e669ac2b1e99a4bab11aaf1c103d306c8;hb=33aa91b1befa3e4f8da57714ac09b7044cf54451;hp=a4fb881a058d040361152145269fb77602462047;hpb=1bed1db4994aae37f4a11e90dabcd8b4e3592686;p=elogind.git

diff --git a/extras/scsi_id/scsi_id.8 b/extras/scsi_id/scsi_id.8
index a4fb881a0..26df0d3e6 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 +50,33 @@ identifier starts with the NAA value of 6):
 .fi
 .P
 
-
 .SH OPTIONS
 .TP
+.BI subsystem
+Deprecated method: 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 \-a
+Always print information (model, vendor strings) about the device even
+if it does not support VPD pages.
+.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.
+This argument should also be used when invoked via udev to avoid problems
+with creation of temporary files on not-yet writable directories.
 .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.
@@ -90,18 +96,52 @@ 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
+.BI \-u
+Reformat the output : replace all whitespaces by underscores
+.TP
 .BI \-v
 Generate verbose debugging output.
 .TP
 .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 deprecated, but
+available for backwards compatibility.
+
+If the DEVPATH environment variable is set, scsi_id assumes it has been
+invoked via udev (or some other hotplug program), and all errors or
+warnings are sent using 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 -d %N -s %p", RESULT="312345", NAME="disk%n"
+.fi
+.P
+
 .SH "FILES"
 .nf
 .ft B
@@ -110,8 +150,7 @@ 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