How to boot a Gecko Rolling's ISO file on hard disk?

[yalegodman]

Hei, guys, I have a Mageia installed on /dev/sda1.

I was told that, with grub2, any bootable iso file can be booted from hard disk, no need to burn the file to CD, or dd it to a USB stick.
and I tried and successed to boot some distro's ISO files by adding the following lines to my Mageia's grub config file, such as the following samples.
But, I just downloaded a Gecko-rolling-*999.220105.iso, but failed to boot it.
Please look the attached picture, that boot process ended here.

Any one can tell me the correct boot script?

boot MX iso, success

menuentry 'MXlinux-21ISO ' {
insmod ext2
set isopath='/MX-21-xfce_x64.iso'
loopback loop (hd0,1)$isopath
linux (loop)/antiX/vmlinuz bootdev=/dev/sdb1 fromiso=$isopath quiet nosplash
initrd (loop)/antiX/initrd.gz
}

boot pclinuxos iso, success

menuentry 'PClinuxOS ISO ' {
insmod ext2
set isofile='/pclinuxos-mate-remaster-kernel5.15.13.iso'
loopback loop (hd0,1)$isofile
linux (loop)/isolinux/vmlinuz root=/dev/sdb1 bootfromiso=$isofile livecd=livecd fromusb
initrd (loop)/isolinux/initrd.gz
}

boot gentoo live ISO, success

menuentry 'GentooLive ISO ' {
insmod ext2
set isofile='/gentoo-livegui-amd64-20220327T170539Z.iso'
loopback loop (hd0,1)$isofile
linux (loop)/boot/gentoo isoboot=$isofile root=/dev/ram0 init=/linuxrc looptype=squashfs loop=/image.squashfs overlayfs cdroot
initrd (loop)/boot/gentoo.igz
}

[geckolinux]

Interesting, I've also heard about that possibility but never tried it. Could you please post the GRUB entries you tried for GeckoLinux?

[yalegodman]

It tried a few codes, the following was the last attempt. Anyway, all the experiments were ended with the same screen rolling.

test boot gecho, failed

menuentry 'Gecho Rolling Cinna ISO ' {
insmod ext2
set isofile='/GeckoLinux_ROLLING_Cinnamon.x86_64-999.220105.0.iso'
loopback loop (hd0,1)$isofile
*** linux (loop)/boot/x86_64/loader/linux isoboot=$isofile root=live:CDLABEL=GeckoLinux_ROLLING_Cinnamon iso-scan/filename=$isofile rd.live.image rd.live.overlay.persistent rd.live.overlay.cowfs=ext4
linux (loop)/boot/x86_64/loader/linux isoboot=$isofile root=live:CDLABEL=GeckoLinux_ROLLING_Cinnamon iso-scan/filename=$isofile
initrd (loop)/boot/x86_64/loader/initrd
}

[yalegodman]

Hei, I have successfully booted my gecho ISO file with the following codes:

   menuentry 'Gecko 2201 Cinnamon ISO' {
   set gfxpayload=keep
   set isofile='/GeckoLinux_ROLLING_Cinnamon.x86_64-999.220105.0.iso'
   loopback loop (hd0,1)$isofile
   linux (loop)/boot/x86_64/loader/linux iso-scan/filename=$isofile quiet root=live:CDLABEL=GeckoLinux_ROLLING_Cinnamon rd.live.image rd.live.overlay.persistent rd.live.overlay.cowfs=ext4
   initrd (loop)/boot/x86_64/loader/initrd
   }

[geckolinux]

Very cool, thanks for posting the solution!