On Tuesday 24 June 2008, Darragh Bailey wrote:
> Lead up, I'm working on a build system, part of it needs to produce
> an iso. Need to be able to add a file to the initrd used by the
> kernel in the iso when it boots, which is a compressed ext2 image.
>
Modern (not just distro-patched) linux kernels support cpio archives as
an initramfs (which is used similarly to an initrd, but isn't one).
Perhaps you could use that instead? You can handle cpio archives as an
ordinary user. The standard "cpio" command line tool is just strange,
but alternative interfaces exist.
See "External initramfs images" in
linux/Documentation/filesystems/ramfs-rootfs-initramfs.txt
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