Work on a Gentoo bootstrap script
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README.md
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README.md
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A script to bootstrap a user with git and some auxiliary tools.
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## Usage
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## Building User Home
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Download and run the latest `bootstrap.sh`:
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```
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cd
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git clone https://git.9iron.club/salt/bootstrap
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./bootstrap/bootstrap.sh $HOME
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```
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In the event that you want to simply test `bootstrap.sh`, simply pass a different argument to it:
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```
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./bootstrap/bootstrap.sh -d /path/to/directory
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```
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See `bootstrap.sh -h` for more usage information.
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## Building a Gentoo Install
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First, partition out the system and build a filesystem tree in `/mnt`.
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Then, download and run the latest `gentoostrap.sh`:
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```
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cd
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git clone https://git.9iron.club/salt/bootstrap
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sudo ./bootstrap/gentoostrap.sh
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```
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The script supports a fair few arguments, so it's worth looking into `gentoostrap.sh -h` if you need to customize the system.
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Note that this is highly specific to my environment. Most of the configuration management is done in Ansible, but this will create a user with my own personal setup.
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## Older Versions
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`build-home.sh` is an older version of the script kept here for legacy compatibility. Do not use it; use `bootstrap.sh`.
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gentoostrap.sh
Executable file
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gentoostrap.sh
Executable file
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#! /bin/bash
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#
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# gentoostrap
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# Build a Gentoo system in /mnt
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# Copyright (C) 2020 Vintage Salt <rehashedsalt@cock.li>
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#
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# Distributed under terms of the MIT license.
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#
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set -e
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# Read-only set-once variables
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declare -r _name="$(basename -- "$0")"
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# Options
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declare -i _optchroot
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declare _optdest="/mnt"
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declare -i _opthelp
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declare -i _optverbose
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# Working variables
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declare -a _args
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declare _return
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# Helper functions
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log() {
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# Print a line to the terminal if _optverbose is greater than $2
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# $2 defaults to 0
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# loglevel 0: Daily-use messages
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# loglevel 1: Detailed but not quite debugging
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# loglevel 2: Definitely debugging
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[ -z "$1" ] && return 1
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if (( _optverbose >= ${2:-0} )); then
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printf "%s\\n" "$1"
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fi
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}
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warn() {
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# Print a yellow line to the terminal, respecting _optverbose
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[ -z "$1" ] && return 1
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if (( _optverbose >= ${2:-0} )); then
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if [ -t 1 ]; then
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printf "\\e[33m%s\\e[0m\\n" "$1"
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else
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printf "WARN: %s\\n" "$1"
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fi
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fi
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}
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error() {
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# Print a red line to the terminal, exit if $2 is specified
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[ -z "$1" ] && return 1
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if [ -t 2 ]; then
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printf "\\e[31m%s\\e[0m\\n" "$1" 1>&2
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else
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printf "ERROR: %s\\n" "$1" 1>&2
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fi
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[ -z "$2" ] && return
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exit "${2:-1}"
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}
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has() {
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# Parse out all arguments and try to find them in path
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# If an argument cannot be found, set _return and fail
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for prog in "$@"; do
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if ! command -v "$prog" > /dev/null 2>&1; then
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_return="$prog"
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return 1
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fi
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done
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return 0
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}
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# Core program functions
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printhelp() {
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cat << EOF
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Usage: $_name [OPTION]...
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-h Print this help text
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-c Perform the Gentoo half of installation. Must be invoked from a chroot
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-v Print more status messages. Stacks
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Copyright (c) 2020 rehashedsalt@cock.li
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Licensed under the MIT license
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EOF
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}
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build-gentoo() {
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# Build Gentoo
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# First, get a link to a stage3 tarball
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stage3="http://distfiles.gentoo.org/releases/amd64/autobuilds/current-stage3-amd64-systemd/$(
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curl -s http://distfiles.gentoo.org/releases/amd64/autobuilds/current-stage3-amd64-systemd/ \
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| grep -oe 'stage3-amd64-systemd-20.*\.tar\.xz' \
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| sed 's/^stage3.*">//g' \
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| uniq \
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| sort \
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| head -n 1
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)"
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stage3file="$(mktemp "tmp.$USER.$_name.XXXXXX-stage3.tar.xz" -p "/tmp")"
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trap "cleanup $stage3file" EXIT
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log "Getting tarball from: $stage3"
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curl -s "$stage3" -o "$stage3file"
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log "Decompressing tarball; this will prompt for root privileges"
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sudo tar xf "$stage3" -C "$_optdest"
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# Now we do some pre-chroot configuration
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pushd "$_optdest" > /dev/null 2>&1
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# These is a very generic make.conf to get the system up and running
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# We use march of x86-64 to ensure compatibility if we're bootstrapping on a host other than the target
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cat <<-EOF > "$_optdest/etc/portage/make.conf"
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COMMON_FLAGS="-march=x86-64 -mtune=generic -O2 -pipe"
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CFLAGS="\${COMMON_FLAGS}"
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CXXFLAGS="\${COMMON_FLAGS}"
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GENTOO_MIRRORS="http://distfiles.gentoo.org"
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MAKEOPTS="$(nproc)"
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EOF
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# Configure default ebuild repositories
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mkdir -p "$_optdest/etc/portage/repos.conf"
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cp "$_optdest/usr/share/portage/config/repos.conf" \
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"$_optdest/etc/portage/repos.conf/gentoo.conf"
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# DNS
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cat <<-EOF > "$_optdest/etc/resolv.conf"
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nameserver 8.8.8.8
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nameserver 8.8.4.4
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EOF
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# Now we need to pivot into a chroot and finish configuration natively
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# Buuuut... since we're using systemd, we get to just spawn a systemd-nspawn container
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popd
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cp "$0" "$_optdest/gentoostrap.sh"
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sudo systemd-nspawn --directory="$_optdest" "/gentoostrap.sh -c"
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}
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build-gentoo-chroot() {
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# Build Gentoo, but from within the chroot environment
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:
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}
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# Main
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main() {
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# Parse out arguments
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while [ -n "$1" ]; do
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# Parse out flags
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while getopts ":chv" opt; do
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case $opt in
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c)
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_optchroot=1
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;;
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h)
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_opthelp=1
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;;
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v)
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_optverbose+=1
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;;
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:)
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error "Option requires argument: -$OPTARG" 2
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;;
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*)
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error "Invalid option: -$OPTARG" 2
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;;
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esac
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done
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# Store arguments
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shift $((OPTIND - 1))
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if [ -n "$1" ]; then
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_args+=("$1")
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shift
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fi
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unset OPTIND
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done
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# Early hook for help
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[ -n "$_opthelp" ] && printhelp && exit 0
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# Validate critical options
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# TODO: That
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# Validate core program dependencies
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log "Validating dependencies" 2
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if ! has basename curl tar; then
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error "Failed to find program: $_return" 1
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fi
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# Do the do
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if [ -z "$_optchroot" ]; then
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build-gentoo
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else
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build-gentoo-chroot
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fi
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exit 0
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}
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main "$@"
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