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diff --git a/usr.sbin/jls/jls.8 b/usr.sbin/jls/jls.8
--- a/usr.sbin/jls/jls.8
+++ b/usr.sbin/jls/jls.8
@@ -23,7 +23,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
-.Dd February 13, 2025
+.Dd July 25, 2025
.Dt JLS 8
.Os
.Sh NAME
@@ -35,6 +35,10 @@
.Op Fl dhNnqsv
.Op Fl j Ar jail
.Op Ar parameter ...
+.Nm
+.Fl c
+.Op Fl d
+.Fl j Ar jail
.Sh DESCRIPTION
The
.Nm
@@ -54,11 +58,21 @@
If no
.Ar parameters
or any of the options
-.Fl hns
+.Fl chns
are given, the following four columns will be printed:
jail identifier (jid), IP address (ip4.addr), hostname (host.hostname),
and path (path).
.Pp
+When the
+.Fl c
+option is used,
+.Nm
+will not emit any output except for usage errors.
+This mode is intended solely to check for a single jail's existence, and it does
+not accept any
+.Ar parameter
+or print-option flags.
+.Pp
The following options are available:
.Bl -tag -width indent
.It Fl -libxo
@@ -68,6 +82,8 @@
See
.Xr xo_options 7
for details on command line arguments.
+.It Fl c
+Only check for the jail's existence.
.It Fl d
List
.Va dying
diff --git a/usr.sbin/jls/jls.c b/usr.sbin/jls/jls.c
--- a/usr.sbin/jls/jls.c
+++ b/usr.sbin/jls/jls.c
@@ -37,6 +37,7 @@
#include <arpa/inet.h>
#include <netinet/in.h>
+#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <jail.h>
@@ -59,6 +60,7 @@
#define PRINT_SKIP 0x10
#define PRINT_VERBOSE 0x20
#define PRINT_JAIL_NAME 0x40
+#define PRINT_EXISTS 0x80
static struct jailparam *params;
static int *param_parent;
@@ -81,6 +83,14 @@
static void emit_ip_addr_list(int af_family, const char *list_name,
struct jailparam *param);
+static void
+usage(void)
+{
+ xo_errx(1,
+ "usage: jls [-dhNnqv] [-j jail] [param ...]\n"
+ " jls -c [-d] -j jail");
+}
+
int
main(int argc, char **argv)
{
@@ -94,12 +104,15 @@
xo_set_version(JLS_XO_VERSION);
jname = NULL;
pflags = jflags = jid = 0;
- while ((c = getopt(argc, argv, "adj:hNnqsv")) >= 0)
+ while ((c = getopt(argc, argv, "acdj:hNnqsv")) >= 0)
switch (c) {
case 'a':
case 'd':
jflags |= JAIL_DYING;
break;
+ case 'c':
+ pflags |= PRINT_EXISTS;
+ break;
case 'j':
jid = strtoul(optarg, &ep, 10);
if (!jid || *ep) {
@@ -130,7 +143,7 @@
PRINT_VERBOSE;
break;
default:
- xo_errx(1, "usage: jls [-dhNnqv] [-j jail] [param ...]");
+ usage();
}
#ifdef INET6
@@ -144,7 +157,24 @@
argv += optind;
/* Add the parameters to print. */
- if (argc == 0) {
+ if ((pflags & PRINT_EXISTS) != 0) {
+ if ((pflags & ~PRINT_EXISTS) != 0) {
+ xo_warnx("-c is incompatible with other print options");
+ usage();
+ } else if (argc != 0) {
+ xo_warnx("-c does not accept non-option arguments");
+ usage();
+ } else if (jid == 0 && jname == NULL) {
+ xo_warnx("-j jail to check must be provided for -c");
+ usage();
+ }
+
+ /*
+ * Force libxo to be silent, as well -- we're only wanting our
+ * exit status.
+ */
+ xo_set_style(NULL, XO_STYLE_TEXT);
+ } else if (argc == 0) {
if (pflags & (PRINT_HEADER | PRINT_NAMEVAL))
add_param("all", NULL, (size_t)0, NULL, JP_USER);
else if (pflags & PRINT_VERBOSE) {
@@ -239,9 +269,17 @@
xo_open_list("jail");
/* Fetch the jail(s) and print the parameters. */
if (jid != 0 || jname != NULL) {
- if (print_jail(pflags, jflags) < 0)
+ if (print_jail(pflags, jflags) < 0) {
+ /*
+ * We omit errors from existential issues if we're just
+ * doing a -c check that the jail exists.
+ */
+ if (pflags & PRINT_EXISTS)
+ exit(1);
xo_errx(1, "%s", jail_errmsg);
+ }
} else {
+ assert((pflags & PRINT_EXISTS) == 0);
for (lastjid = 0;
(lastjid = print_jail(pflags, jflags)) >= 0; )
;
@@ -392,6 +430,8 @@
jid = jailparam_get(params, nparams, jflags);
if (jid < 0)
return jid;
+ else if (pflags & PRINT_EXISTS)
+ return 0;
xo_open_instance("jail");

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