[Bug 2036886] Re: please add api to repack initramfs

[Benjamin Drung]

** Changed in: initramfs-tools (Ubuntu)
       Status: New => Triaged

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Title:
  please add api to repack initramfs

Status in initramfs-tools package in Ubuntu:
  Triaged

Bug description:
  please add api to repack initramfs

  from the results of unpackinitramfs, including all early & main dirs.

  Userstory: i want to tweak my initrd in-place by replacing broken
  libc.so.6 with a patched one, I want to use unmkinitramfs, modify
  files in main, repack it and boot it.

  CLI:

  $ unmkinitramfs /boot/initrd.img unpacked-initrd
  $ ls unpacked-initrd/
  early  early2  main
  $ (edit things in unpacked-initrd/main/)
  $ remkinitramfs unpacked-initrd patched-initrd.img

  Where patched-initrd.img is now similar to /boot/initrd.img, apart
  from the changed things.

  I expect remkinitramfs like functionality that will take the output of
  unmkinitramfs (e.g. unpacked-initrd/) directory as input, do
  uncompressed cpio archives out of all the subdirs, make compressed
  cpio archive out of main, and produce a patched-initrd.img that is
  ready for booting.

  It is very close to what mkinitramfs does, but skip calling all the
  hooks to create things a fresh, and just do the final assembly step of
  cpio and compression.

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