[GRUB iso multiboot]

• Auto detect and create entries for .iso files in /iso/
• Preserves its boot options!
• Small and lean, few entries lots of images
• new iso, same script. No need to tweak around (ymmv).

If your pendrive is already formated to FAT skip to 2

1. Installation Guide (clean disk)

export LABEL=<label-of-your-choice>

1.1 Create a partition table:

# fdisk --wipe auto /dev/sdX
g # GPT partition table
n # new partition
1 # first
<enter> # use the whole disk
<enter> # use the whole disk
w # write

1.2 Format to FAT

# mkfs.fat -F32 -n $LABEL /dev/sdX1

Or with gparted

gparted /dev/sdX
# Device -> Create Partition Table... -> select: msdos -> Apply
# Partition -> New -> (configure options) -> Add
	Create as:   Primary Partition
	File System: fat32
	Label:       $LABEL
# Apply all operations
# Select partition /dev/sdX1 -> Left click -> Manage Flags -> Enable boot flag

2. Installation Guide (formated disk)

2.1a mount

mkdir -p /tmp/$LABEL
sudo mount /dev/disk/by-label/$LABEL /tmp/$LABEL

2.1b mount (as a regular user)

pmount /dev/disk/by-label/$LABEL
# adapt destination to the created folder in /media for the following commands
# mount point will look something like this: /media/disk_by-label_$LABEL

2.2 install grub & copy release files

sudo grub-install --force --removable --no-floppy \
    --target=x86_64-efi \
    --boot-directory=/tmp/$LABEL/boot/ \
    --efi-directory=/mnt/$LABEL/ /dev/sdX
tar xvf grub-iso-multiboot.tar.gz -C /tmp/$LABEL

2.3a unmount

umount /tmp/$LABEL

2.3b unmount

pumount /media/disk_by-label_$LABEL

3. Adjusts

3.1 I want my GRUB to look like that

Find a theme you would like to use. The one from the screenshot above is vimix.

Move the theme contents to the themes folder of the instalation, like so:

mount /dev/disk/by-label/$LABEL /tmp/$LABEL
tar xvf Vimix-1080p.tar.xz -C /tmp/
mv /tmp/Vimix-1080p/Vimix /tmp/$LABEL/boot/grub/themes/vimix

Double check that you have the theme.txt file in the correct place /tmp/$LABEL/boot/grub/themes/vimix/theme.txt.

As the last step, select the theme in /tmp/$LABEL/boot/grub/grub.cfg:

-  set theme=/boot/grub/themes/starfield/theme.txt
+  set theme=/boot/grub/themes/vimix/theme.txt

release the pendrive.

umount /tmp/$LABEL

4. Add isos to /boot/iso/

Menu entries will be populated according to the files present during boot. To add isos via terminal, just copy them over:

mount /dev/disk/by-label/$LABEL /tmp/$LABEL
cp <my-iso-file>.iso /tmp/$LABEL/boot/iso/
umount /tmp/$LABEL

5. Development

A Dockerfile is provided to help building the project. It will setup a compilation environment

sudo qemu-system-x86_64 --enable-kvm /dev/sda -bios /usr/share/edk2-ovmf/OVMF_CODE.fd