From f640b32fddfc45210361813b50c629a80d2889d2 Mon Sep 17 00:00:00 2001
From: Kay Sievers <kay.sievers@vrfy.org>
Date: Sat, 6 Sep 2008 16:37:00 +0200
Subject: [PATCH] vol_id: add --debug option

---
 extras/volume_id/vol_id.c   | 38 +++++++++++++++++++++++++------------
 extras/volume_id/vol_id.xml | 15 +++++++++++++++
 2 files changed, 41 insertions(+), 12 deletions(-)

diff --git a/extras/volume_id/vol_id.c b/extras/volume_id/vol_id.c
index dcfb0bb92..d8302bc22 100644
--- a/extras/volume_id/vol_id.c
+++ b/extras/volume_id/vol_id.c
@@ -1,7 +1,7 @@
 /*
  * vol_id - read filesystem label and uuid
  *
- * Copyright (C) 2005-2006 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2005-2008 Kay Sievers <kay.sievers@vrfy.org>
  *
  *	This program is free software; you can redistribute it and/or modify it
  *	under the terms of the GNU General Public License as published by the
@@ -39,11 +39,18 @@
 
 #define BLKGETSIZE64 _IOR(0x12,114,size_t)
 
+static int debug;
+
 static void log_fn(struct udev *udev, int priority,
 		   const char *file, int line, const char *fn,
 		   const char *format, va_list args)
 {
-	vsyslog(priority, format, args);
+	if (debug) {
+		fprintf(stderr, "%s: ", fn != NULL ? fn : file);
+		vfprintf(stderr, format, args);
+	} else {
+		vsyslog(priority, format, args);
+	}
 }
 
 static void vid_log(int priority, const char *file, int line, const char *format, ...)
@@ -113,6 +120,7 @@ int main(int argc, char *argv[])
 		{ "skip-raid", 0, NULL, 's' },
 		{ "probe-all", 0, NULL, 'a' },
 		{ "offset", 2, NULL, 'o' },
+		{ "debug", 0, NULL, 'd' },
 		{ "help", 0, NULL, 'h' },
 		{}
 	};
@@ -151,11 +159,16 @@ int main(int argc, char *argv[])
 	while (1) {
 		int option;
 
-		option = getopt_long(argc, argv, "lLutxsaoh", options, NULL);
+		option = getopt_long(argc, argv, "lLutxsaodh", options, NULL);
 		if (option == -1)
 			break;
 
 		switch (option) {
+		case 'd':
+			debug = 1;
+			if (udev_get_log_priority(udev) < LOG_INFO)
+				udev_set_log_priority(udev, LOG_INFO);
+			break;
 		case 'l':
 			print = PRINT_LABEL;
 			break;
@@ -183,14 +196,15 @@ int main(int argc, char *argv[])
 			break;
 		case 'h':
 			printf("Usage: vol_id [options] <device>\n"
-			    " --export        export key/value pairs\n"
-			    " --type          filesystem type\n"
-			    " --label         filesystem label\n"
-			    " --label-raw     raw label\n"
-			    " --uuid          filesystem uuid\n"
-			    " --skip-raid     don't probe for raid\n"
-			    " --probe-all     find possibly conflicting signatures\n"
-			    " --offset        skip given number of bytes of input\n"
+			    " --export         export key/value pairs\n"
+			    " --type           filesystem type\n"
+			    " --label          filesystem label\n"
+			    " --label-raw      raw label\n"
+			    " --uuid           filesystem uuid\n"
+			    " --skip-raid      don't probe for raid\n"
+			    " --probe-all      find possibly conflicting signatures\n"
+			    " --offset=<bytes> probe at the given offset\n"
+			    " --debug          print debug output to stderr\n"
 			    " --help\n\n");
 			goto exit;
 		default:
@@ -222,7 +236,7 @@ int main(int argc, char *argv[])
 
 	if (ioctl(fd, BLKGETSIZE64, &size) != 0)
 		size = 0;
-	dbg(udev, "BLKGETSIZE64=%llu\n", (unsigned long long)size);
+	info(udev, "BLKGETSIZE64=%llu (%lluGB)\n", (unsigned long long)size, (unsigned long long)size >> 30);
 
 	/* try to drop all privileges before reading disk content */
 	if (getuid() == 0) {
diff --git a/extras/volume_id/vol_id.xml b/extras/volume_id/vol_id.xml
index 6d0a6c692..fcf3a31fa 100644
--- a/extras/volume_id/vol_id.xml
+++ b/extras/volume_id/vol_id.xml
@@ -32,6 +32,8 @@
           <arg><option>--uuid</option></arg>
           <arg><option>--skip-raid</option></arg>
           <arg><option>--probe-all</option></arg>
+          <arg><option>--offset=<replaceable>bytes</replaceable></option></arg>
+          <arg><option>--debug</option></arg>
           <arg><option>--help</option></arg>
           <arg><replaceable>device</replaceable></arg>
         </cmdsynopsis>
@@ -95,6 +97,19 @@
               <para>Probe for all types and print all matches.</para>
             </listitem>
           </varlistentry>
+          <varlistentry>
+            <term><option>--offset=<replaceable>bytes</replaceable></option></term>
+            <listitem>
+              <para>Probing at the given offset, instead of the start of the volume.
+              The offset value is specified in bytes.</para>
+            </listitem>
+          </varlistentry>
+          <varlistentry>
+            <term><option>--debug</option></term>
+            <listitem>
+              <para>Print debug output to stderr.</para>
+            </listitem>
+          </varlistentry>
           <varlistentry>
             <term><option>--help</option></term>
             <listitem>
-- 
2.30.2