fstab-generator: ignore invalid swap priority

A failed priority is not something worth stopping boot over. Most people
have only one swap device, in which case priority is irrelevant, and even
if there is more than one swap device, they are all usable, and ignoring the
priority field should only result in some loss of performance.

The kernel will report the priority as -1 if not set, so it's easy for
people to make this mistake.

https://bugzilla.redhat.com/show_bug.cgi?id=1204336

1 files changed, 16 insertions, 7 deletions

diff --git a/src/fstab-generator/fstab-generator.c b/src/fstab-generator/fstab-generator.c
index ccc7c6e26e..2ece12f792 100644
--- a/src/fstab-generator/fstab-generator.c
+++ b/src/fstab-generator/fstab-generator.c
@@ -53,9 +53,10 @@ static int add_swap(
                 bool noauto,
                 bool nofail) {
 
-        _cleanup_free_ char *name = NULL, *unit = NULL, *lnk = NULL;
+        _cleanup_free_ char *name = NULL, *unit = NULL, *lnk = NULL, *filtered = NULL;
         _cleanup_fclose_ FILE *f = NULL;
         int r, pri = -1;
+        const char *opts;
 
         assert(what);
         assert(me);
@@ -70,9 +71,17 @@ static int add_swap(
                 return 0;
         }
 
-        r = fstab_find_pri(me->mnt_opts, &pri);
-        if (r < 0)
-                return log_error_errno(r, "Failed to parse priority: %m");
+        opts = me->mnt_opts;
+        r = fstab_find_pri(opts, &pri);
+        if (r < 0) {
+                log_error_errno(r, "Failed to parse priority, ignoring: %m");
+
+                /* Remove invalid pri field */
+                r = fstab_filter_options(opts, "pri\0", NULL, NULL, &filtered);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to parse options: %m");
+                opts = filtered;
+        }
 
         name = unit_name_from_path(what, ".swap");
         if (!name)
@@ -105,15 +114,15 @@ static int add_swap(
         if (pri >= 0)
                 fprintf(f, "Priority=%i\n", pri);
 
-        if (!isempty(me->mnt_opts) && !streq(me->mnt_opts, "defaults"))
-                fprintf(f, "Options=%s\n", me->mnt_opts);
+        if (!isempty(opts) && !streq(opts, "defaults"))
+                fprintf(f, "Options=%s\n", opts);
 
         r = fflush_and_check(f);
         if (r < 0)
                 return log_error_errno(r, "Failed to write unit file %s: %m", unit);
 
         /* use what as where, to have a nicer error message */
-        r = generator_write_timeouts(arg_dest, what, what, me->mnt_opts, NULL);
+        r = generator_write_timeouts(arg_dest, what, what, opts, NULL);
         if (r < 0)
                 return r;