Luca Boccassi 918c592272 bootctl: add A/B fallback for sd-boot updates (#41650) ...

On `bootctl install`, two EFI boot entries are registered: one for the
primary sd-boot binary and one for a fallback. On `bootctl update`, the
existing primary binary is rotated to the fallback path before the new
version is installed, so the fallback entry always points to the
previous known-good binary.

```
$ sudo bootctl install
...
Created EFI boot entry "Linux Boot Manager".
Created EFI boot entry "Fallback Linux Boot Manager".
$ sudo bootctl update
Copied "/boot/EFI/systemd/systemd-bootaa64.efi" to "/boot/EFI/systemd/systemd-boot-fallbackaa64.efi".
Copied "/usr/lib/systemd/boot/efi/systemd-bootaa64.efi" to "/boot/EFI/systemd/systemd-bootaa64.efi".
$ efibootmgr
...
Boot0004* Linux Boot Manager        HD(...)/\EFI\systemd\systemd-bootaa64.efi
Boot0005* Fallback Linux Boot Manager     HD(...)/\EFI\systemd\systemd-boot-fallbackaa64.efi
```

Fixes: #23805

2026-05-21 21:56:05 +01:00

..

bootctl-cleanup.c

bootctl: rework/modernize "unlink" and add Varlink API for it

2026-05-01 07:10:31 +02:00

bootctl-cleanup.h

tree-wide: extend verbs functions with extra per-verb data parameter

2026-03-18 10:28:47 +00:00

bootctl-install.c

bootctl: remove fallback EFI Boot#### variable on uninstall

2026-05-21 11:30:46 -07:00

bootctl-install.h

tree-wide: extend verbs functions with extra per-verb data parameter

2026-03-18 10:28:47 +00:00

bootctl-link.c

bootctl: allow extra files on 'link' be specified as literal data

2026-05-05 15:09:47 +02:00

bootctl-link.h

bootctl: add "link" command

2026-05-01 07:10:31 +02:00

bootctl-random-seed.c

find-esp: return pinned fd to ESP/XBOOTLDR

2026-04-20 17:19:27 +02:00

bootctl-random-seed.h

find-esp: return pinned fd to ESP/XBOOTLDR

2026-04-20 17:19:27 +02:00

bootctl-reboot-to-firmware.c

tree-wide: extend verbs functions with extra per-verb data parameter

2026-03-18 10:28:47 +00:00

bootctl-reboot-to-firmware.h

tree-wide: extend verbs functions with extra per-verb data parameter

2026-03-18 10:28:47 +00:00

bootctl-set-efivar.c

tree-wide: extend verbs functions with extra per-verb data parameter

2026-03-18 10:28:47 +00:00

bootctl-set-efivar.h

tree-wide: extend verbs functions with extra per-verb data parameter

2026-03-18 10:28:47 +00:00

bootctl-status.c

bootctl: show SMBIOS feature flags

2026-05-21 21:44:06 +01:00

bootctl-status.h

tree-wide: extend verbs functions with extra per-verb data parameter

2026-03-18 10:28:47 +00:00

bootctl-uki.c

kernel-image: minor refactoring to inspect_kernel()

2026-04-03 08:15:27 +02:00

bootctl-uki.h

tree-wide: extend verbs functions with extra per-verb data parameter

2026-03-18 10:28:47 +00:00

bootctl-unlink.c

bootctl: make sure "unlink" properly tracks "extra" files

2026-05-01 07:10:31 +02:00

bootctl-unlink.h

bootctl: rework/modernize "unlink" and add Varlink API for it

2026-05-01 07:10:31 +02:00

bootctl-util.c

bootctl: override is_efi_boot() check if --variables= option is specified

2026-02-13 16:11:33 +09:00

bootctl-util.h

bootctl: move arg_touch_variables checkers to bootctl-util.c

2026-02-13 16:11:30 +09:00

bootctl.c

tree-wide: get rid of old dispatch_verb

2026-05-16 18:37:10 +02:00

bootctl.h

bootctl: add "link" command

2026-05-01 07:10:31 +02:00

bootspec-util.c

bootctl: add helpers that format a type1 menu entry filename from a commit nr

2026-05-01 07:10:31 +02:00

bootspec-util.h

bootctl: add helpers that format a type1 menu entry filename from a commit nr

2026-05-01 07:10:31 +02:00

meson.build

bootctl: add "link" command

2026-05-01 07:10:31 +02:00

test-bootspec-util.c

bootctl: add helpers that format a type1 menu entry filename from a commit nr

2026-05-01 07:10:31 +02:00