… images as well as disk and initramdisk images?
Peek ISO images
Using guestfish(1) this is an easy task. On a Debian system guestfish is packed in the libguestfs-tools:
~# guestfish -a cdrom.iso ><fs> list-filesystems /dev/sda1: iso9660 ><fs> mkmountpoint /cd ><fs> mount /dev/sda1 /cd ><fs> mkmountpoint /squash ><fs> mount-loop /cd/LiveOS/squashfs.img /squash/ ><fs> mkmountpoint /ext3 ><fs> mount-loop /squash/LiveOS/ext3fs.img /ext3/ ><fs> ls /ext3/ bin boot dev etc home initrd.img [...]
Maybe we wanted to extract some file:
><fs> copy-out /ext3/initrd.img .
And guestfish is even scriptable and thusly eases your workflow when routinely handling image files.
BTW, wanna know what’s inside this particular iniramdisk /ext3/initrd.img?
Poke initramdisk
with tools from initramfs-tools:
~# lsinitramfs initrd.img . kernel kernel/x86 kernel/x86/microcode [...]
Now you know, you desperately need the content of this initramdisk. Easy:
~# unmkinitramfs initrd.img ~/initrd/
Check.