From 4f8155ddbcf85ffe3fa6b8a571f6b51c35e1837a Mon Sep 17 00:00:00 2001
From: "Stephen J. Kiernan" <stevek@FreeBSD.org>
Date: Fri, 11 Nov 2016 17:41:17 +0000
Subject: [PATCH] Add support for LOADER_RC setting in the pkgfs manifest
 (defaults to /loader.rc) to specify a Forth file to read from the pkgfs
 tarball and process by Ficl.

This allows for the tarball to do runtime things like load a
platform-specific FDT blob, among other things.

Reviewed by:	imp
Approved by:	sjg (mentor)
MFC after:	2 weeks
Sponsored by:	Juniper Networks, Inc.
Differential Revision:	https://reviews.freebsd.org/D8494
---
 sys/boot/common/install.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/sys/boot/common/install.c b/sys/boot/common/install.c
index e40c228a5ea..8c19066894a 100644
--- a/sys/boot/common/install.c
+++ b/sys/boot/common/install.c
@@ -39,7 +39,6 @@ __FBSDID("$FreeBSD$");
 
 #include "bootstrap.h"
 
-extern struct in_addr rootip;
 extern struct in_addr servip;
 
 extern int pkgfs_init(const char *, struct fs_ops *);
@@ -50,6 +49,7 @@ COMMAND_SET(install, "install", "install software package", command_install);
 static char *inst_kernel;
 static char **inst_modules;
 static char *inst_rootfs;
+static char *inst_loader_rc;
 
 static int
 setpath(char **what, char *val)
@@ -146,6 +146,8 @@ read_metatags(int fd)
 			error = setmultipath(&inst_modules, val);
 		else if (strcmp(tag, "ROOTFS") == 0)
 			error = setpath(&inst_rootfs, val);
+		else if (strcmp(tag, "LOADER_RC") == 0)
+			error = setpath(&inst_loader_rc, val);
 
 		tag = p;
 	}
@@ -173,6 +175,10 @@ cleanup(void)
 		free(inst_rootfs);
 		inst_rootfs = NULL;
 	}
+	if (inst_loader_rc != NULL) {
+		free(inst_loader_rc);
+		inst_loader_rc = NULL;
+	}
 	pkgfs_cleanup();
 }
 
@@ -275,6 +281,16 @@ install(char *pkgname)
 		goto fail;
 	}
 
+	/* If there is a loader.rc in the package, execute it */
+	s = (inst_loader_rc == NULL) ? "/loader.rc" : inst_loader_rc;
+	fd = open(s, O_RDONLY);
+	if (fd != -1) {
+		close(fd);
+		error = include(s);
+		if (error == CMD_ERROR)
+			goto fail;
+	}
+
 	i = 0;
 	while (inst_modules != NULL && inst_modules[i] != NULL) {
 		error = mod_loadkld(inst_modules[i], 0, NULL);