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Index: sbin/init/init.8
===================================================================
--- sbin/init/init.8
+++ sbin/init/init.8
@@ -316,6 +316,14 @@
.Xr reboot 8
.Fl r
for details.
+.It Va init_exec
+If set to a valid file name in the root file system,
+instructs
+.Nm
+to directly execute that file as the very first action,
+replacing
+.Nm
+as PID 1.
.It Va init_script
If set to a valid file name in the root file system,
instructs
@@ -341,6 +349,8 @@
The default is
.Dq Li /bin/sh .
It is used for running the
+.Va init_exec
+or
.Va init_script
if set, as well as for the
.Pa /etc/rc
Index: sbin/init/init.c
===================================================================
--- sbin/init/init.c
+++ sbin/init/init.c
@@ -196,6 +196,19 @@
static session_t *find_session(pid_t);
static DB *session_db;
+static void
+run_exec(char *path)
+{
+ char *argv[3];
+ char sh[] = "sh";
+
+ argv[0] = sh;
+ argv[1] = path;
+ argv[2] = NULL;
+
+ execute_script(argv);
+}
+
/*
* The mother of all processes.
*/
@@ -329,6 +342,11 @@
close(0);
close(1);
close(2);
+
+ if (kenv(KENV_GET, "init_exec", kenv_value, sizeof(kenv_value)) > 0) {
+ run_exec(kenv_value);
+ _exit(0); /* reboot */
+ }
if (kenv(KENV_GET, "init_script", kenv_value, sizeof(kenv_value)) > 0) {
state_func_t next_transition;
Index: stand/man/loader.8
===================================================================
--- stand/man/loader.8
+++ stand/man/loader.8
@@ -492,6 +492,9 @@
.It Va init_chroot
See
.Xr init 8 .
+.It Va init_exec
+See
+.Xr init 8 .
.It Va init_path
Sets the list of binaries which the kernel will try to run as the initial
process.

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