Bug 26708

Description of problem:

Attempting to install Mageia 7 from ISO image stored on disk. Am able to configure grub to boot the 64 bit netinstall ISO but then when running netinstall the option to "Install from disk" fails because the netinstall instance cannot identify the NVMe SSD.

Version-Release number of selected component (if applicable):


How reproducible: Happens every time.


Steps to Reproduce:
1. Based on the process documented here: https://wiki.mageia.org/en/Installing_Mageia_from_ISO_images_on_disk_using_grub2

2. Used a modified local grub to provide option to boot the netinstall image.
Two updates for NVMe (UEFI) boot:
a) line 30: insmod part_gpt
b) line 38: set root="hd0,gpt5"

These are to enable access to the GPT (global partition table). 
The /mnt/install-iso/ partition:
    [mpb@localhost ~]$ df /mnt/install-iso
    Filesystem      Size  Used Avail Use% Mounted on
    /dev/nvme0n1p5  9.8G  4.3G  5.0G  47% /mnt/install-iso
                ^^ => gpt5

[mpb@localhost ~]$ nl -ba etc_grub.d_40_custom
     1	
     2	# --------------------------------------------- added on 2020_05_30 at 18:51
     3	# Example for adding to /etc/grub.d/40_custom
     4	# 
     5	# Reference: https://wiki.mageia.org/en/Installing_Mageia_from_ISO_images_on_disk_using_grub2
     6	#
     7	# NB ensure correct values set for your configuration below:
     8	#
     9	#    1) set isofile=
    10	#       example: set isofile="/Mageia-7-netinstall-nonfree-x86_64.iso"
    11	#       NB leading "/"
    12	#
    13	#    2) set root=
    14	#       example: set root="hd0,1"
    15	#       This is for /dev/sda1. Other examples:
    16	#        /mnt/install-iso/ mounted at /dev/sda12 is "hd0,12"
    17	#        /mnt/install-iso/ mounted at /dev/sdb9 is "hd1,9"
    18	#
    19	#    3) loopback loop
    20	#       example: loopback loop (hd0,1)$isofile
    21	#       NB "hd0,1" is /dev/sda1 and no "/" before "$isofile"
    22	#
    23	#   
    24	
    25	# 64-bit example: 
    26	
    27	 menuentry "Mageia 7 Network Install nonfree 64-bit iso" {
    28	         insmod gzio
    29	#         insmod part_msdos
    30		 insmod part_gpt
    31	         insmod ext2
    32	         insmod xfs
    33	         insmod loopback
    34	         insmod iso9660
    35	         insmod udf
    36	         set isofile="/Mageia-7-netinstall-nonfree-x86_64.iso"
    37	#         set root="hd0,1"
    38		 set root="hd0,gpt5"
    39	         loopback loop (hd0,gpt5)$isofile
    40	         linux (loop)/isolinux/x86_64/vmlinuz isofile=$isofile
    41	         initrd (loop)/isolinux/x86_64/all.rdz
    42	 }


3. After selecting "boot netinstall" boot option, attempting to install from ISO image stroed on disk fails because the netinstall iso is not able to access the NVMe at all. In this case we are attempting to access Mageia-7.1-x86_64.iso in the same gpt5 partition as the netinstall iso.

[mpb@localhost install-iso]$ df /mnt/install-iso/
Filesystem      Size  Used Avail Use% Mounted on
/dev/nvme0n1p5  9.8G  4.3G  5.0G  47% /mnt/install-iso

[mpb@localhost install-iso]$ cd /mnt/install-iso/

[mpb@localhost install-iso]$ ls -lh
total 4.3G
drwx------ 2 root root  16K May 30 17:48 lost+found/
-rw-r--r-- 1 mpb  mpb  4.2G Jul 13  2019 Mageia-7.1-x86_64.iso
-rw-r--r-- 1 mpb  mpb   152 Jul 13  2019 Mageia-7.1-x86_64.iso.sha512
-rw-rw-r-- 1 mpb  mpb   81M Aug 14  2019 Mageia-7-netinstall-nonfree-x86_64.iso
-rw-rw-r-- 1 mpb  mpb   169 Aug 14  2019 Mageia-7-netinstall-nonfree-x86_64.iso.sha512