From 97f48a8c67520bf1a58f1516ea3f5953ef399a96 Mon Sep 17 00:00:00 2001
From: Kay Sievers <kay.sievers@vrfy.org>
Date: Fri, 29 May 2009 14:05:39 +0200
Subject: udevadm: settle - add --exit-if-exists=<file>

---
 udev/udevadm-settle.c | 23 ++++++++++++++++++-----
 udev/udevadm.xml      |  6 ++++++
 2 files changed, 24 insertions(+), 5 deletions(-)

diff --git a/udev/udevadm-settle.c b/udev/udevadm-settle.c
index 9059adc341..0b3f2e2124 100644
--- a/udev/udevadm-settle.c
+++ b/udev/udevadm-settle.c
@@ -54,6 +54,7 @@ int udevadm_settle(struct udev *udev, int argc, char *argv[])
 		{ "seq-start", required_argument, NULL, 's' },
 		{ "seq-end", required_argument, NULL, 'e' },
 		{ "timeout", required_argument, NULL, 't' },
+		{ "exit-if-exists", required_argument, NULL, 'E' },
 		{ "quiet", no_argument, NULL, 'q' },
 		{ "help", no_argument, NULL, 'h' },
 		{}
@@ -61,6 +62,7 @@ int udevadm_settle(struct udev *udev, int argc, char *argv[])
 	unsigned long long start = 0;
 	unsigned long long end = 0;
 	int quiet = 0;
+	const char *exists = NULL;
 	int timeout = DEFAULT_TIMEOUT;
 	struct sigaction act;
 	struct udev_queue *udev_queue = NULL;
@@ -80,7 +82,7 @@ int udevadm_settle(struct udev *udev, int argc, char *argv[])
 		int option;
 		int seconds;
 
-		option = getopt_long(argc, argv, "s:e:t:qh", options, NULL);
+		option = getopt_long(argc, argv, "s:e:t:E:qh", options, NULL);
 		if (option == -1)
 			break;
 
@@ -102,12 +104,16 @@ int udevadm_settle(struct udev *udev, int argc, char *argv[])
 		case 'q':
 			quiet = 1;
 			break;
+		case 'E':
+			exists = optarg;
+			break;
 		case 'h':
 			printf("Usage: udevadm settle OPTIONS\n"
-			       "  --timeout=<seconds>   maximum time to wait for events\n"
-			       "  --seq-start=<seqnum>  first seqnum to wait for\n"
-			       "  --seq-end=<seqnum>    last seqnum to wait for\n"
-			       "  --quiet               do not print list after timeout\n"
+			       "  --timeout=<seconds>     maximum time to wait for events\n"
+			       "  --seq-start=<seqnum>    first seqnum to wait for\n"
+			       "  --seq-end=<seqnum>      last seqnum to wait for\n"
+			       "  --exit-if-exists=<file> stop waiting if file exists\n"
+			       "  --quiet                 do not print list after timeout\n"
 			       "  --help\n\n");
 			exit(0);
 		}
@@ -173,6 +179,13 @@ int udevadm_settle(struct udev *udev, int argc, char *argv[])
 	}
 
 	while (1) {
+		struct stat statbuf;
+
+		if (exists != NULL && stat(exists, &statbuf) == 0) {
+			rc = 0;
+			break;
+		}
+
 		if (start > 0) {
 			/* if asked for, wait for a specific sequence of events */
 			if (udev_queue_get_seqnum_sequence_is_finished(udev_queue, start, end) == 1) {
diff --git a/udev/udevadm.xml b/udev/udevadm.xml
index 5996c01383..538180babe 100644
--- a/udev/udevadm.xml
+++ b/udev/udevadm.xml
@@ -236,6 +236,12 @@
                 <para>Wait only for events before the given sequence number.</para>
               </listitem>
             </varlistentry>
+            <varlistentry>
+              <term><option>--exit-if-exists=<replaceable>file</replaceable></option></term>
+              <listitem>
+                <para>Stop waiting if file exists.</para>
+              </listitem>
+            </varlistentry>
             <varlistentry>
               <term><option>--quiet</option></term>
               <listitem>
-- 
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