[pve-devel] [PATCH 1/2] assistant: keep prepared iso bootable on uefi with flash drives

[Aaron Lauterer]

On  2024-04-30  11:41, Stefan Sterz wrote:
> On Tue Apr 30, 2024 at 10:54 AM CEST, Aaron Lauterer wrote:
>> By mapping files into the ISO, the UUID for the partitions change as
>> they depend on the timestamp. The result is, that grub cannot find its
>> partition anymore and the user ends up on the grub shell.
>>
>> This only happens when booting from a blockdev in UEFI mode. E.g. a USB
>> flash drive. Alternatively one can `dd` the ISO to a small (2GiB) VM
>> disk and mark it as the first boot device.
>>
>> Booting in legacy mode or via CDROM (e.g. pass through via IPMI), it
>> worked.
>>
>> Xorriso can report the commands needed to recreate the source ISO. The
>> '-volume_date uuid' is the one needed to override the same UUIDs. We
>> therefore read it first from the source iso and pass it as parameter
>> whenever we inject a file into the iso.
>>
>> Signed-off-by: Aaron Lauterer <a.lauterer at proxmox.com>
>> ---
>>   proxmox-auto-install-assistant/src/main.rs | 44 ++++++++++++++++++++--
>>   1 file changed, 41 insertions(+), 3 deletions(-)
>>
>>
>> +fn get_iso_uuid(iso: &PathBuf) -> Result<String> {
>> +    let result = Command::new("xorriso")
>> +        .arg("-dev")
>> +        .arg(iso)
>> +        .arg("-report_system_area")
>> +        .arg("cmd")
>> +        .output()?;
>> +    if !result.status.success() {
>> +        bail!(
>> +            "Error determining the UUID of the source ISO: {}",
>> +            String::from_utf8_lossy(&result.stderr)
>> +        );
>> +    }
>> +    let mut uuid = String::new();
>> +    for line in String::from_utf8(result.stdout)?.lines() {
>> +        if line.starts_with("-volume_date uuid") {
>> +            uuid = line
>> +                .split(' ')
>> +                .last()
>> +                .unwrap()
> 
> nit: while this probably won't happen, if xorriso ever starts returning
> nothing to the above command, this unwrap may panic. it might be nice to
> do a `ok_or_else(|| bail!("xorisso command behaved unexpectedly"))?` or
> similar here.

thanks. will send a v2
> 
>> +                .replace('\'', "")
>> +                .trim()
>> +                .into();
>> +            break;
>> +        }
>> +    }
>> +    Ok(uuid)
>> +}
>> +
>>   fn get_disks() -> Result<BTreeMap<String, BTreeMap<String, String>>> {
>>       let unwantend_block_devs = vec![
>>           "ram[0-9]*",
> 
> 
> 
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