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bootonce feature is temporary, one time boot, activated by "bectl activate -t BE", "bectl activate -T BE" will reset the bootonce flag. By default, the bootonce setting is reset on attempt to boot and the next boot will use previously active BE. By setting zfs_bootonce_activate="YES" in rc.conf, the bootonce BE will be set permanently active. bootonce dataset name is recorded in boot pool labels, bootenv area. in case of nextboot, the nextboot_enable boolean variable is recorded in freebsd:nvstore nvlist, also stored in boot pool label bootenv area. On boot, the loader will process /boot/nextboot.conf if nextboot_enable is "YES", and will set nextboot_enable to "NO", preventing /boot/nextboot.conf processing on next boot. bootonce and nextboot features are usable in both UEFI and BIOS boot. To use bootonce/nextboot features, the boot loader needs to be updated on disk; if loader.efi is stored on ESP, then ESP needs to be updated and for BIOS boot, stage2 (zfsboot or gptzfsboot) needs to be updated (gpart or other tools). At this time, only lua loader is updated. Sponsored by: Netflix, Klara Inc. Differential Revision: https://reviews.freebsd.org/D25512 |
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| librescue | ||
| rescue | ||
| Makefile | ||
| README | ||
The /rescue build system here has three goals: 1) Produce a reliable standalone set of /rescue tools. The contents of /rescue are all statically linked and do not depend on anything in /bin or /sbin. In particular, they'll continue to function even if you've hosed your dynamic /bin and /sbin. For example, note that /rescue/mount runs /rescue/mount_nfs and not /sbin/mount_nfs. This is more subtle than it looks. As an added bonus, /rescue is fairly small (thanks to crunchgen) and includes a number of tools (such as gzip, bzip2, vi) that are not normally found in /bin and /sbin. 2) Demonstrate robust use of crunchgen. These Makefiles recompile each of the crunchgen components and include support for overriding specific library entries. Such techniques should be useful elsewhere. 3) Produce a toolkit suitable for small distributions. Install /rescue on a CD or CompactFlash disk, and symlink /bin and /sbin to /rescue to produce a small and fairly complete FreeBSD system. These tools have one big disadvantage: being statically linked, they cannot use some advanced library functions that rely on dynamic linking. In particular, nsswitch, locales, and pam all rely on dynamic linking. To compile: # cd /usr/src/rescue # make obj # make # make install Note that rebuilds don't always work correctly; if you run into trouble, try 'make clean' before recompiling. $FreeBSD$