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For some applications, initramfs can use the casper utility to create a writable environment using unionfs to overlay a persistence layer over a read-only root filesystem image. For example, overlay data can be stored on a USB flash drive, while a compressed SquashFS read-only image stored on a live CD acts as a root filesystem. [7] [8]
Unlike existing Linux boot images, the Dracut framework attempts to introduce as little hard-coded logic into the initramfs as possible. [1] The initramfs has essentially one purpose: locating and mounting the real root file system so that the boot process can transition to it. [1] This functionality is dependent on device availability. [1]
The initramfs is a gzipped cpio archive that contains a small root file system. It contains init, which is executed. It contains init, which is executed. The Android kernel is a modified version of the Linux kernel.
Many distributions use dracut to generate and maintain the initramfs image. The root file system is later switched via a call to pivot_root() which unmounts the temporary root file system and replaces it with the use of the real one, once the latter is accessible. [14] The memory used by the temporary root file system is then reclaimed.
Cpio is therefore typically used with other utilities that generate the list of files to be archived, such as the find program. The resulting cpio archive is a sequence of files and directories concatenated into a single archive, separated by header sections with file meta information, such as filename, inode number, ownership, permissions, and ...
Java backporting tools are programs (usually written in Java) that convert Java classes bytecodes from one version of the Java Platform to an older one (for example Java 5.0 backported to 1.4). Java backporting tools comparison
Linux kernel boot and decompression process. vmlinux is a statically linked executable file that contains the Linux kernel in one of the object file formats supported by Linux, which includes Executable and Linkable Format (ELF) and Common Object File Format (COFF).
Squashfs was initially maintained as an out-of-tree Linux patch. The initial version 1.0 was released on 23 October 2002. [7] In 2009 Squashfs was merged into Linux mainline as part of Linux 2.6.29. [8] [9] In that process, the backward-compatibility code for older formats was removed.