mirror of
https://github.com/clearlinux/clr-init.git
synced 2026-10-04 16:08:34 +00:00
Josue David Hernandez
b20497f266
this initrd will work using systemd as init program then this repo provide the scripts to create a systemd initrd Signed-off-by: Josue David Hernandez <josue.d.hernandez.gutierrez@intel.com>
149 lines
7.9 KiB
Markdown
149 lines
7.9 KiB
Markdown
## clr-init
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Initrd created using systemd as init program
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## Luks Encryption support
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The systemd rd parameters for luks most be added to the kernel cmdline to know who is the encrypted root partition:
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https://www.freedesktop.org/software/systemd/man/systemd-cryptsetup-generator.html#Kernel%20Command%20Line
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This initrd most not be using with LVM partitons, how ever it could be complemented adding services in an additional initrd
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## How this works
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This is the flow of an initrd with systemd:
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```
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+----------------+
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| systemd (init) |
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+----------------+
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+
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v
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+--------------------------------+
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| system-generators |
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|--------------------------------|
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| nfs-server-generator |
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| rpc-pipefs-generator |
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| systemd-cryptsetup-generator |
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| systemd-debug-generator |
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| systemd-fstab-generator |
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| systemd-getty-generator |
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| systemd-gpt-auto-generator |
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| systemd-system-update-generator|
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| systemd-veritysetup-generator |
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+--------------------------------+
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+
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v
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+-------------------+
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|local-fs-pre.target|
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+-------------------+
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+
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v
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+-----------------------------+ +-----------------+ +-----------------------+
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| local-fs.target | | swap.target | | cryptsetup.target |
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|-----------------------------| |-----------------| |-----------------------|
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| | | | | |
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| tmp.mount | | (various swap | | (various cryptsetup |
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| systemd-remount-fs.service | | devices...) | | devices...) |
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| | | | | |
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+-----------------------------+ +-----------------+ +-----------------------+
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+ | |
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| | |
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+------------------------------>|<------------------------------+
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v
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+--------------------------------------+
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| sysinit.target |
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|--------------------------------------|
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| systemd-ask-password-console.path |
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| systemd-tmpfiles-setup-dev.service |
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| systemd-tmpfiles-setup.service |
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| systemd-udevd.service |
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| systemd-udev-trigger.service |
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+--------------------------------------+
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+
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+------------------+-----------------+|+---------------+------------------------+
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| | | | |
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v v | v v
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+----------------+ +----------------+ | +------------------------------++---------------+
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| timers.target | | paths.target | | | sockets.target || rescue.target |
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|----------------| |----------------| | |------------------------------|+---------------+
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| (various | | (various | | | systemd-udevd-control.socket|
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| timers...) | | paths...) | | | systemd-udevd-kernel.socket |
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| | | | | | |
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+----------------+ +----------------+ | +------------------------------+
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+ | +
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+------------------>|<---------------+
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v
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+------------+
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|basic.target|
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+------------+
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+
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v
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+--------------------------------+ +----------------+
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| initrd-root-device.target | |emergency.target|
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|--------------------------------| +----------------+
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| sysroot.mount |
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+--------------------------------+
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+
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v
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+--------------------------------+
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| initrd-root-fs.target |
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|--------------------------------|
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| initrd-parse-etc.service |
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+--------------------------------+
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+
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v
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+--------------------------------+
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| initrd-fs.target |
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|--------------------------------|
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| (sysroot-usr.mount and |
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| various mounts marked |
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| with fstab option |
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| x-initrd.mount...) |
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+--------------------------------+
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+
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v
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+------------------------------------+
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| initrd.target |
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|------------------------------------|
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| initrd-cleanup.service |
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| initrd-udevadm-cleanup-db.service |
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+------------------------------------+
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+
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v
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+-------------------------------+
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| initrd-switch-root.target |
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|-------------------------------|
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| initrd-switch-root.service |
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+-------------------------------+
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+
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v
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+------------------------+
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| Transition to Host OS |
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+------------------------+
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```
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## Create and Install
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This will install clr-init.cpio.gz in /usr/lib/initrd
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```
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make && make install
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```
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