efi: support updating multiple EFIs in mirrored setups (RAID1) #855
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The prep PR is coreos#824 Fixes coreos#132
HuijingHei
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| if let Some(esp_device) = self.get_esp_device() { | ||
| esp_devices.push(esp_device.to_string_lossy().into_owned()); | ||
| } else { | ||
| esp_devices = blockdev::find_colocated_esps("/").expect("get esp devices"); | ||
| }; |
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Have you considered / tried the case with 2 disks / 2 separate OS ? (we do that in our lab, 2 or even 3 rpm-ostree based OS, each one on one disk, all installed via anaconda)
I'm asking because quickly looking at the code, I would use find_colocated_esps("/") first and get_esp_device() as a fallback.
The safest might even be:
- mounted ESP(s)
- colocated ESP(s)
- get_esp_device
If you have a bootc installed OS, and on a second disk an anaconda installed OS (not even ostree based), right now you are going to always pick the anaconda ESP
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I would use find_colocated_esps("/") first and get_esp_device() as a fallback.
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get_esp_device()will find CoreOS ESP label/dev/disk/by-partlabel/EFI-SYSTEM, or Anaconda ESP label/dev/disk/by-partlabel/EFI\\x20System\\x20Partition -
find_colocated_esps("/")will list ESP partitions on the devices with mountpoint/boot, but it does not mean it is always mounted, for example, coreos does not mount esp after booted, see doc
Consider that on single disk, can easily get ESP label /dev/disk/by-partlabel/EFI-SYSTEM via get_esp_device(), but on multiple disks, it would be /dev/disk/by-label/esp-1 & /dev/disk/by-label/esp-2, does this make sense?
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The safest might even be:
mounted ESP(s)
colocated ESP(s)
get_esp_device
What I did: when running update, get_esp_devices() would list the all esp devices, then in the loop device will check mounted ESP first, if not, will mount the esp then upgrade. I think you meant that need to check mounted firstly in the beginning, will try that, thanks!
Edit: For multiple disks, we still need the loop for each esp device. Will keep it as it is, WDYT?
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get_esp_devices() would list the all esp devices
Maybe I don't understand rust code, but for me it first call get_esp_device() which returns 1 device based on a weak heuristic, if that fails then it tries to find multiple devices
Here 3 test cases, second OS (sdb) booted, running get_esp_devices():
sda: normal anaconda install
sdb: ESP not mounted, not using anaconda/coreos label
-> returns sda ?
sda: normal anaconda install
sdb & sdc: raid 1 mirrored, ESP not mounted, not using anaconda/coreos label
-> returns sda ?
sda: normal coreos install
sdb: also a coreos install, ESP not mounted
-> not sure which PARTLABEL wins, likely random at each boot
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I do not have such env, but IMU, if second OS (sdb) booted, sda will not be mounted from the booted OS, in this case, we do not scan sda.
sda: normal anaconda install
sdb: ESP not mounted, not using anaconda/coreos label
skip sda, and get_esp_devices() will call find_colocated_esps("/") to find the mount point /boot device, then get ESP part on the same device
sda: normal anaconda install
sdb & sdc: raid 1 mirrored, ESP not mounted, not using anaconda/coreos label
skip sda, this is the case that we need to resolve actually, find_colocated_esps("/") to find the mount point /boot device which is /dev/md126, then need to get the backing devices list sdb & sdc and find ESP part on each device
sda: normal coreos install
sdb: also a coreos install, ESP not mounted
When I tried to boot VM with 2 coreos, failed with:
[ 9.373774] rdcore[957]: Error: System has 2 devices with a filesystem labeled 'boot': ["/dev/vdb3", "/dev/vda3"]
[FAILED] Failed to start CoreOS Ignition Ensure Unique Boot Filesystem.
So we can skip this env.
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On a server with 3 disks / 3 installs side by side
# udevadm info /dev/sda1 | grep '^S: disk/by-partlabel'
S: disk/by-partlabel/EFI\x20System\x20Partition
# udevadm info /dev/sdb1 | grep '^S: disk/by-partlabel'
S: disk/by-partlabel/EFI\x20System\x20Partition
# udevadm info /dev/sdc1 | grep '^S: disk/by-partlabel'
S: disk/by-partlabel/EFI\x20System\x20Partition
All 3 wants to have the by-partlabel symlink, only the first one gets it, I'm not aware of any ordering/priorities
In case 1&2 we do not mount sda, but udev definitely scans it
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All 3 wants to have the by-partlabel symlink
If booted sda, then it will find ESP part in sda, I do not think it will retrieve all the devices.
The prep PR is #824
Fixes #132