git: 4f3be6b8d94a - main - kboot: Fetch hostfs_root and bootdev from the environment

The branch main has been updated by imp:

URL: https://cgit.FreeBSD.org/src/commit/?id=4f3be6b8d94a388ce7ae239c785ea447d0adbf48

commit 4f3be6b8d94a388ce7ae239c785ea447d0adbf48
Author:     Warner Losh <imp@FreeBSD.org>
AuthorDate: 2023-01-13 21:20:56 +0000
Commit:     Warner Losh <imp@FreeBSD.org>
CommitDate: 2023-01-13 21:22:39 +0000

    kboot: Fetch hostfs_root and bootdev from the environment
    
    Fetch bootdev from the environment variable (so it should be set on the
    command line). Default to 'zfs:' which will in the future look for the
    first zpool that we can boot from. Prior versions of kboot would set
    this from the second argument on the command line.
    
    Fetch hostfs_root from the environment (defaulting to '/'). Prior
    versions of kboot would set this from the first arg on the command line.
    
    Sponsored by:           Netflix
    Reviewed by:            kevans
    Differential Revision:  https://reviews.freebsd.org/D38010
---
 stand/kboot/main.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/stand/kboot/main.c b/stand/kboot/main.c
index d333737e164a..9a0f8b8baf69 100644
--- a/stand/kboot/main.c
+++ b/stand/kboot/main.c
@@ -172,6 +172,9 @@ main(int argc, const char **argv)
 	heapbase = host_getmem(heapsize);
 	setheap(heapbase, heapbase + heapsize);
 
+	/* Parse the command line args -- ignoring for now the console selection */
+	parse_args(argc, argv);
+
 	/*
 	 * Set up console.
 	 */
@@ -180,8 +183,20 @@ main(int argc, const char **argv)
 	/* Initialize all the devices */
 	devinit();
 
-	/* Parse the command line args -- ignoring for now the console selection */
-	parse_args(argc, argv);
+	bootdev = getenv("bootdev");
+	if (bootdev == NULL)
+		bootdev="zfs:";
+	hostfs_root = getenv("hostfs_root");
+	if (hostfs_root == NULL)
+		hostfs_root = "/";
+#if defined(LOADER_ZFS_SUPPORT)
+	if (strcmp(bootdev, "zfs:") == 0) {
+		/*
+		 * Pseudo device that says go find the right ZFS pool.
+		 */
+		printf("WARNING: bare 'zfs:' for boot device not yet implemented\n");
+	}
+#endif
 
 	printf("Boot device: %s with hostfs_root %s\n", bootdev, hostfs_root);