swapon: add support for "nofail" fstab mount option

This option is already supported by mount(8) and fsck(8), there is no
reason to have any exception for swap devices. Note that the --ifexists
command line option applies to all swap devices, the "nofail" setting
is per device.

Signed-off-by: Karel Zak <kzak@redhat.com>

2 files changed, 11 insertions, 3 deletions

diff --git a/mount/swapon.8 b/mount/swapon.8
index a3ebc97cd..595198d51 100644
--- a/mount/swapon.8
+++ b/mount/swapon.8
@@ -113,6 +113,12 @@ Devices that are already being used as swap are silently skipped.
 .TP
 .B "\-e, \-\-ifexists"
 Silently skip devices that do not exist.
+The
+.I /etc/fstab
+mount option
+.BI nofail
+may be also used to skip non-existing device.
+
 .TP
 .B "\-f, \-\-fixpgsz"
 Reinitialize (exec /sbin/mkswap) the swap space if its page size does not
diff --git a/mount/swapon.c b/mount/swapon.c
index d51149251..45cd26699 100644
--- a/mount/swapon.c
+++ b/mount/swapon.c
@@ -573,7 +573,7 @@ swapon_all(void) {
 
 	while ((fstab = getmntent(fp)) != NULL) {
 		const char *special;
-		int skip = 0;
+		int skip = 0, nofail = ifexists;
 		int pri = priority;
 		char *opt, *opts;
 
@@ -588,6 +588,8 @@ swapon_all(void) {
 				pri = atoi(opt+4);
 			if (strcmp(opt, "noauto") == 0)
 				skip = 1;
+			if (strcmp(opt, "nofail") == 0)
+				nofail = 1;
 		}
 		free(opts);
 
@@ -596,13 +598,13 @@ swapon_all(void) {
 
 		special = fsprobe_get_devname_by_spec(fstab->mnt_fsname);
 		if (!special) {
-			if (!ifexists)
+			if (!nofail)
 				status |= cannot_find(fstab->mnt_fsname);
 			continue;
 		}
 
 		if (!is_in_proc_swaps(special) &&
-		    (!ifexists || !access(special, R_OK)))
+		    (!nofail || !access(special, R_OK)))
 			status |= do_swapon(special, pri, CANONIC);
 
 		free((void *) special);