Comment # 12 on bug 1047385 from Michael Chang

Somehow the check for ESP failed for /dev/sda2 during installation ...

> 2017-07-08T11:12:30.818676+00:00 install os-prober: debug: running /usr/lib/os-probes/50mounted-tests on /dev/sda2
> 2017-07-08T11:12:31.200487+00:00 install 50mounted-tests: debug: mounted using GRUB fat filesystem driver
> 2017-07-08T11:12:31.204085+00:00 install 50mounted-tests: debug: running subtest /usr/lib/os-probes/mounted/05efi
> 2017-07-08T11:12:31.214430+00:00 install 05efi: debug: /dev/sda2 is a FAT partition (mounted by GRUB)
> 2017-07-08T11:12:31.358373+00:00 install 05efi: debug: /dev/sda2 container is ''
> 2017-07-08T11:12:31.365021+00:00 install 05efi: debug: /dev/sda2 partition scheme is 
> 2017-07-08T11:12:31.368233+00:00 install 05efi: debug: /dev/sda2 partition type is 
> 2017-07-08T11:12:31.371530+00:00 install 05efi: debug: /dev/sda2 is not a ESP partition: exiting

The partition scheme and type is retrieved from udev database 'udevadm info -q
property -n /dev/sda2' of the two records

  ID_PART_ENTRY_TYPE
  ID_PART_ENTRY_SCHEME

And both has no value during installation, in turn having the check result to
be false one.

Meanwhile I tested Tumbleweed on virtual machine and did not reproduced the
problem, the Windows can be properly probed. Perhaps the problem is 42.3
specific ?

Anyway lets needinfo udev maintainer to see if any better idea.

Hi Franck

Do you have any better idea ? The offending script in os-prober invoking
"udevadm info" to retrieve the properties can be found here :  

https://anonscm.debian.org/git/d-i/os-prober.git/tree/os-probes/mounted/x86/05efi#n37

Thanks.