Allow dhcpcd to run on a read-only filesystem.

You'll get a lot of errors, but you will get a working address and routing.

2 files changed, 16 insertions, 24 deletions

diff --git a/dhcp.c b/dhcp.c
index a88cb20c..28bf4383 100644
--- a/dhcp.c
+++ b/dhcp.c
@@ -1125,10 +1125,8 @@ write_lease(const struct interface *iface, const struct dhcp_message *dhcp)
 	    iface->name, iface->leasefile);
 
 	fd = open(iface->leasefile, O_WRONLY | O_CREAT | O_TRUNC, 0444);
-	if (fd == -1) {
-		syslog(LOG_ERR, "%s: open: %m", iface->name);
+	if (fd == -1)
 		return -1;
-	}
 
 	/* Only write as much as we need */
 	while (p < e) {
diff --git a/dhcpcd.c b/dhcpcd.c
index 819953b5..6a155f6f 100644
--- a/dhcpcd.c
+++ b/dhcpcd.c
@@ -1934,29 +1934,25 @@ main(int argc, char **argv)
 		}
 
 		/* Ensure we have the needed directories */
-		if (mkdir(RUNDIR, 0755) == -1 && errno != EEXIST) {
+		if (mkdir(RUNDIR, 0755) == -1 && errno != EEXIST)
 			syslog(LOG_ERR, "mkdir `%s': %m", RUNDIR);
-			exit(EXIT_FAILURE);
-		}
-		if (mkdir(DBDIR, 0755) == -1 && errno != EEXIST) {
+		if (mkdir(DBDIR, 0755) == -1 && errno != EEXIST)
 			syslog(LOG_ERR, "mkdir `%s': %m", DBDIR);
-			exit(EXIT_FAILURE);
-		}
 
 		pidfd = open(pidfile, O_WRONLY | O_CREAT | O_NONBLOCK, 0664);
-		if (pidfd == -1) {
+		if (pidfd == -1)
 			syslog(LOG_ERR, "open `%s': %m", pidfile);
-			exit(EXIT_FAILURE);
-		}
-		/* Lock the file so that only one instance of dhcpcd runs
-		 * on an interface */
-		if (flock(pidfd, LOCK_EX | LOCK_NB) == -1) {
-			syslog(LOG_ERR, "flock `%s': %m", pidfile);
-			exit(EXIT_FAILURE);
+		else {
+			/* Lock the file so that only one instance of dhcpcd
+			 * runs on an interface */
+			if (flock(pidfd, LOCK_EX | LOCK_NB) == -1) {
+				syslog(LOG_ERR, "flock `%s': %m", pidfile);
+				exit(EXIT_FAILURE);
+			}
+			if (set_cloexec(pidfd) == -1)
+				exit(EXIT_FAILURE);
+			writepid(pidfd, getpid());
 		}
-		if (set_cloexec(pidfd) == -1)
-			exit(EXIT_FAILURE);
-		writepid(pidfd, getpid());
 	}
 
 	syslog(LOG_INFO, "version " VERSION " starting");
@@ -1968,10 +1964,8 @@ main(int argc, char **argv)
 	add_event(signal_fd, handle_signal, NULL);
 
 	if (options & DHCPCD_MASTER) {
-		if (start_control() == -1) {
+		if (start_control() == -1)
 			syslog(LOG_ERR, "start_control: %m");
-			exit(EXIT_FAILURE);
-		}
 	}
 
 	if (init_sockets() == -1) {
@@ -2045,7 +2039,7 @@ main(int argc, char **argv)
 
 	if (!(options & DHCPCD_BACKGROUND)) {
 		/* If we don't have a carrier, we may have to wait for a second
-		 * before one becomes available if we brought an interface up. */
+		 * before one becomes available if we brought an interface up */
 		if (opt == 0 &&
 		    options & DHCPCD_LINK &&
 		    options & DHCPCD_WAITUP &&