- support for running on a cross-compiled rootfs, see README.cross
- add support for creating secureboot signed UEFI images
- use microcode found in packed cpio images
- `-k/--kmodir` must now contain "lib/modules/$KERNEL_VERSION"
  use DRACUT_KMODDIR_OVERRIDE=1 to ignore this check
- support the EFI Stub loader's splash image feature.
  `--uefi-splash-image <FILE>`

dracut modules:
- remove bashism in various boot scripts
- emergency mode: use sulogin

- add rd.nofcoe option to disable the FCoE module from the command line

- fix keymaps not getting included sometimes
- use eurlatgr as default console font

- add option `rd.iscsi.testroute`

- fix udev rules detection of multipath devices

- support NetworkManager

- fix classless static route parsing
- ifup: fix typo when calling dhclient --timeout
- ifup: nuke pid and lease files if dhclient failed
- fix ip=dhcp,dhcp6
- use $name instead of $env{INTERFACE} (systemd-udevd regression)

- fix for non-systemd reboot/halt/shutdown commands
- set selinux labels
- fix shutdown with console=null

- list squash content as well
- handle UEFI created with dracut --uefi
- make lsinitrd usable for images made with Debian mkinitramfs

- fixed ldd parsing
- install kernel module dependencies of dependencies
- fixed segfault for hashing NULL pointers
- add support for compressed firmware files
- dracut_mkdir(): create parent directories as needed.

test suite:
- lots of cleanups
- add github actions

new modules:
- rngd
- network-manager
- ppcmac - thermal/fan control modules on PowerPC based Macs
2 files changed
tree: 6a11a1662eec4c70e9d1a6b8efdc316aab40897b
  1. .github/
  2. dracut.conf.d/
  3. examples/
  4. install/
  5. modules.d/
  6. skipcpio/
  7. test/
  8. .dir-locals.el
  9. .gitignore
  10. .kateconfig
  11. .kateproject
  12. .mailmap
  13. .travis.yml
  14. 50-dracut.install
  15. 51-dracut-rescue-postinst.sh
  16. 51-dracut-rescue.install
  18. configure
  20. dracut-bash-completion.sh
  21. dracut-catimages.8.asc
  22. dracut-catimages.sh
  23. dracut-functions.sh
  24. dracut-init.sh
  25. dracut-initramfs-restore.sh
  26. dracut-logger.sh
  27. dracut.8.asc
  28. dracut.asc
  29. dracut.bootup.7.asc
  30. dracut.cmdline.7.asc
  31. dracut.conf
  32. dracut.conf.5.asc
  33. dracut.css
  34. dracut.logrotate
  35. dracut.modules.7.asc
  36. dracut.png
  37. dracut.sh
  38. dracut.spec
  39. dracut.svg
  40. dracut.usage.asc
  41. fedora-test-github.sh
  42. fedora-test.sh
  43. git2spec.pl
  45. logtee.c
  46. lsinitrd-bash-completion.sh
  47. lsinitrd.1.asc
  48. lsinitrd.sh
  49. Makefile
  50. mkinitrd-dracut.sh
  51. mkinitrd-suse.8.asc
  52. mkinitrd-suse.sh
  53. mkinitrd.8.asc
  54. NEWS
  56. profile.py
  57. README.cross
  58. README.generic
  59. README.kernel
  60. README.md
  61. README.modules
  62. README.testsuite
  63. TODO


dracut is an event driven initramfs infrastructure.

Build Status Fedora-30 Fedora-31

dracut (the tool) is used to create an initramfs image by copying tools and files from an installed system and combining it with the dracut framework, usually found in /usr/lib/dracut/modules.d.

Unlike existing initramfs‘s, this is an attempt at having as little as possible hard-coded into the initramfs as possible. The initramfs has (basically) one purpose in life -- getting the rootfs mounted so that we can transition to the real rootfs. This is all driven off of device availability. Therefore, instead of scripts hard-coded to do various things, we depend on udev to create device nodes for us and then when we have the rootfs’s device node, we mount and carry on. This helps to keep the time required in the initramfs as little as possible so that things like a 5 second boot aren‘t made impossible as a result of the very existence of an initramfs. It’s likely that we‘ll grow some hooks for running arbitrary commands in the flow of the script, but it’s worth trying to resist the urge as much as we can as hooks are guaranteed to be the path to slow-down.

Most of the initramfs generation functionality in dracut is provided by a bunch of generator modules that are sourced by the main dracut script to install specific functionality into the initramfs. They live in the modules.d subdirectory, and use functionality provided by dracut-functions to do their work.

Some general rules for writing modules:

  • Use one of the inst family of functions to actually install files on to the initramfs. They handle mangling the pathnames and (for binaries, scripts, and kernel modules) installing dependencies as appropriate so you do not have to.
  • Scripts that end up on the initramfs should be POSIX compliant. dracut will try to use /bin/dash as /bin/sh for the initramfs if it is available, so you should install it on your system -- dash aims for strict POSIX compliance to the extent possible.
  • Hooks MUST be POSIX compliant -- they are sourced by the init script, and having a bashism break your user's ability to boot really sucks.
  • Generator modules should have a two digit numeric prefix -- they run in ascending sort order. Anything in the 90-99 range is stuff that dracut relies on, so try not to break those hooks.
  • Hooks must have a .sh extension.
  • Generator modules are described in more detail in README.modules.
  • We have some breakpoints for debugging your hooks. If you pass ‘rdbreak’ as a kernel parameter, the initramfs will drop to a shell just before switching to a new root. You can pass ‘rdbreak=hookpoint’, and the initramfs will break just before hooks in that hookpoint run.

Also, there is an attempt to keep things as distribution-agnostic as possible. Every distribution has their own tool here and it's not something which is really interesting to have separate across them. So contributions to help decrease the distro-dependencies are welcome.

Currently dracut lives on github.com and kernel.org.

The tarballs can be found here: http://www.kernel.org/pub/linux/utils/boot/dracut/ ftp://ftp.kernel.org/pub/linux/utils/boot/dracut/

Git: git://git.kernel.org/pub/scm/boot/dracut/dracut.git http://git.kernel.org/pub/scm/boot/dracut/dracut.git https://git.kernel.org/pub/scm/boot/dracut/dracut.git


Git Web: https://github.com/dracutdevs/dracut.git


Project Documentation: http://www.kernel.org/pub/linux/utils/boot/dracut/dracut.html

Project Wiki: http://dracut.wiki.kernel.org

See the TODO file for things which still need to be done and HACKING for some instructions on how to get started. There is also a mailing list that is being used for the discussion -- initramfs@vger.kernel.org. It is a typical vger list, send mail to majordomo@vger.kernel.org with body of ‘subscribe initramfs email@host.com

Licensed under the GPLv2