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Full Discussion: change initramfs by hand?
Operating Systems Linux Debian change initramfs by hand? Post 302268015 by frankie06 on Sunday 14th of December 2008 10:20:27 PM
Old 12-14-2008
Tools change initramfs by hand?

What's the correct way to change the initramfs file that's used during boot?
I know that it's a gzipped cpio archive, but when I gunzip, extract, re-archive (without changing any files), and gzip, then the result is that the system does not boot any more. And I even set the cpio archive type.

Do I need special tools for the initramfs? There are progs like update-initramfs but the point is that I need to put in files that were *not* put in by the tools that originally created the initramfs.
 

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cpio(4) 						     Kernel Interfaces Manual							   cpio(4)

NAME
cpio - format of cpio archive DESCRIPTION
The header structure, when the option of is not used (see cpio(1)), is: When the option is used, the header information is described by: Longtime and Longfile are equivalent to and respectively. The contents of each file are recorded together with other items describing the file. Every instance of contains the constant 070707 (octal). The items through have meanings explained in stat(2). The length of the null-terminated path name including the null byte, is given by The last record of the archive always contains the name Directories and the trailer are recorded with equal to zero. It will not always be the case that and correspond to the results of but the values are always sufficient to tell whether two files in the archive are linked to each other. When a device special file is archived by HP-UX (using the option), contains a magic constant which is dependent upon the implementation doing the writing. flags the device file as an HP-UX 32-bit device specifier, and contains the 32-bit device specifier (see stat(2)). If the option is not present, special files are not archived or restored. Non-HPUX device special files are never restored. SEE ALSO
cpio(1), find(1), stat(2). STANDARDS CONFORMANCE
cpio(4)
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