tinyramfs/README.md

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Features
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--------
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- No `local`'s, no bashisms, only POSIX shell
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- Easy configuration
- LUKS
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- LVM
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- mdev, mdevd, eudev
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Installation
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------------
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Dependencies
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------------
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* POSIX shell
* `toybox` OR `busybox` OR `sbase/ubase` OR `coreutils/util-linux`
* `mdev` OR `mdevd` OR `eudev`
* `kmod`
- Not required for monolithic kernel (builtin modules)
* `cryptsetup`
- Required for LUKS support
* `lvm2`
- Required for LVM support
Usage
-----
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```
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usage: ./tinyramfs [option]
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-o, --output <file> set initramfs output path
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-c, --config <file> set config file path
-m, --moddir <dir> set modules directory
-k, --kernel <ver> set kernel version
-F, --files <dir> set files directory
-d, --debug enable debug mode
-f, --force overwrite initramfs image
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```
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Configuration
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-------------
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```sh
# debug mode
#
debug=0
# overwrite initramfs
#
force=0
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# initramfs output path
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#
# default - /tmp/initramfs-$kernel
# example - output="/tmp/myinitramfs.img.gz"
#
output=""
# monolithic kernel
#
monolith=0
# modules directory
#
# default - /lib/modules
# example - moddir="/mnt/root/lib/modules"
#
moddir=""
# kernel version
#
# default - $(uname -r)
# example - kernel="5.4.18_1"
#
kernel=""
# compression program
#
# default - gzip -9
# example - compress="pigz -9"
#
compress=""
# root
#
# supported - PARTUUID, DEVICE, LABEL, PARTUUID
# example -
# root="/dev/sda1"
# root="PARTUUID=35f923c5-083a-4950-a4da-e611d0778121"
#
root=""
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# root type
#
# default - autodetected
# example - root_type="btrfs"
#
root_type=""
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# root options
# example - see fstab(5)
#
root_opts=""
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# device manager
# supported - udev, mdev, mdevd
#
devmgr=""
# hostonly mode
#
hostonly=0
# additional modules
# example - modules="fat crc32c_generic"
#
modules=""
# exclude modules
# example - modules_exclude="wmi fuse"
#
modules_exclude=""
# additional binaries
# example - binaries="ls cat /path/to/mycustomprog"
#
binaries=""
# LVM support
#
lvm=0
# LVM options
#
# supported - tag, name, group, config, discard
# description -
# tag - trigger lvm by tag
# name - trigger lvm by logical volume name
# group - trigger lvm by volume group name
# config - embed host lvm config
# discard - enable issue_discards
# example -
# lvm_opts="tag=lvm-server"
# lvm_opts="name=lv1,group=vg1"
# lvm_opts="config=1,discard"
# lvm_opts="discard=1"
#
lvm_opts=""
# LUKS support
#
luks=0
# LUKS encrypted root
#
# supported - PARTUUID, DEVICE, LABEL, PARTUUID
# example -
# luks_root="/dev/sda1"
# luks_root="PARTUUID=35f923c5-083a-4950-a4da-e611d0778121"
#
luks_root=""
# LUKS options
#
# supported - key, name, header, discard
# description -
# key - embed key
# name - device mapper name
# header - embed header
# discard - enable allow-discards
# example -
# luks_opts="key=/path/to/keyfile,name=myluksroot,header=/path/to/header,discard"
# luks_opts="discard=1"
#
luks_opts=""
```
TODO document kernel command-line parameters
License
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-------
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Licensed under GPLv3