Creating a Fedora remix with livecd-creator, no custom plymouth theme on live boot.

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I have also run into this issue. (Whether the theme comes from an RPM or from elsewhere does not matter, by the way.) You already found the source of the problem in your FedoraForum thread: you have to pass the kernel version to dracut, the image gets generated for the wrong one otherwise. The Sugar on a Stick spin kickstart contains the solution: https://git.fedorahosted.org/cgit/spin-kickstarts.git/tree/fedora-livecd-soas.ks#n19.

EDIT: It turns out that the snippet from the Sugar on a Stick kickstart is not sufficient on its own, at least not for CD/DVD images. (SoaS targets USB, so it might be different there.) It also turns out that it is not actually needed for the Sugar theme because that one sets itself as the default in the package's %post scriptlet, but that is not an option if you don't have an RPM, nor if you want to use an existing RPM that does not make itself the default that way (such as plymouth-theme-fade-in). (I also don't think it's a very nice solution.) So why does it not work? That's because livecd-creator copies the initramfs from the INSTALL_ROOT to the LIVE_ROOT before running the %post scriptlets. (The initramfs is then deleted by some kickstarts' %post scriptlets, because it is not actually needed on the live image, it will be rebuilt in hostonly mode during installation anyway.) The solution is to add a %post --nochroot snippet that moves the regenerated initramfs to the correct place:

%post --nochroot
mv -f $INSTALL_ROOT/boot/initramfs-3*.img $LIVE_ROOT/isolinux/initrd0.img

With both the snippet from the Sugar on a Stick kickstart and the above extra trick, setting a different Plymouth theme works for me.

When I change plymouth themes, I do this:

plymouth-set-default-theme --list

This is just to find the theme I want - is the chapeau one listed?

Then just:

plymouth-set-default-theme charge -R
/usr/libexec/plymouth/plymouth-update-initrd
grub2-mkconfig -o /boot/grub2/grub.cfg

The last one sometimes is necessary as it is Grub that does the boot-up initrd stuff.

All these commands have to be done as root, which boot up stuff probably is done as anyway. It may just be simpler to add this as a script which is automatically booted afterwards if it does not work in the 'post' stage - perhaps with rc.local or something, and that automatically removes or disables itself after running sucessfully to stop it running at every boot up?

I also wish they would get rid of the stupid hot-dog - introducing vegetarians to Fedora does not always work...