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# Common Bash functions for helper scripts in this repository
set -eu
## Logging #####################################################################
_print() {
local color="\e[$1m"
local clrcolor="\e[0m"
shift
if [ ! -t 1 ]; then
color=""
clrcolor=""
fi
printf "${color}%s${clrcolor}\n" "$*" >&2
}
stage() {
_print '1;32' "$@"
}
info() {
_print '1;35' "$@"
}
error() {
_print '1;31' "$@"
}
warning() {
_print '1;33' "$@"
}
## SSH access helper ###########################################################
# Convert hostname to the SSH destination
sshdest() {
if [ "$1" = "lipwig" ]; then
echo "cynerd.cz"
elif [ "$1" = "binky" ]; then
echo "binky.vpn"
else
awk -F- 'NF > 1 { print $2"."$1; exit } { print $1 }' <<<"$1"
fi
}
# Reverse opeartion for sshdest
sshhost() {
if [ "$1" = "cynerd.cz" ]; then
echo "lipwig"
else
awk -F. 'NF > 1 { print $2"-"$1; exit } { print $1 }' <<<"$1"
fi
}
_ssh() {
local device="$1"
shift
if [ "$device" != "$(hostname)" ]; then
ssh "$(sshdest "$device")" -- "$@"
else
if [ $# -gt 1 ]; then
"$@"
else
sh -c "$1"
fi
fi
}
_rootssh() {
local device="$1"
local cmd="$2"
if [ "$device" != "$(hostname)" ]; then
ssh -t "$(sshdest "$device")" sudo "sh -c '${cmd}'"
else
sudo sh -c "$cmd"
fi
}
## Evalutions and queries ######################################################
# The path where build result is linked to
result() {
echo ".result-$1"
}
# Get system of the device
device_system() {
nix eval --raw ".#nixosConfigurations.$1.config.nixpkgs.hostPlatform.system"
}
build_system() {
nix eval --raw --impure --expr 'builtins.currentSystem'
}
# Validates if link is valid.
build_validate() {
local device="$1"
[ -L "$(result "$device")" ] && [ -e "$(result "$device")" ]
}
## Build NixOS system ##########################################################
# $1: device name
# All other arguments are passed to the nix build command
build() {
local device="$1"
shift
local toplevel="config.system.build.toplevel"
local bsystem="$(build_system)"
if [ "$bsystem" != "$(device_system "$device")" ]; then
toplevel="buildPlatform.$bsystem.$toplevel"
fi
stage "Building system for device: $device"
nix build \
-o "$(result "${device}")" \
--keep-going \
"$@" \
"${0%/*}#nixosConfigurations.${device}.${toplevel}"
}
## Copy NixOS system ###########################################################
# $1: device name
copy() {
local device="$1"
if ! build_validate "$device"; then
warning "System for device '$device' seems to be not build." >&2
return 1
fi
local store
store="$(readlink -f "$(result "$device")")"
local freespace required;
freespace_raw="$(_ssh "$device" df -B 1 --output=avail /nix)"
freespace="$(echo "$freespace_raw" | tail -1)"
required="$(nix path-info -S "$store" | awk '{ print $2 }')"
info "Free space on device: $(numfmt --to=iec "$freespace")"
info "Required space: $(numfmt --to=iec "$required")"
if [ "$required" -ge "$freespace" ]; then
error "There is not enough space to copy clousure to: $device" >&2
return 1
fi
stage "Copy closure to: $device"
nix copy -s --to "ssh://$(sshdest "$device")" "$store"
}
## Switch Nix encironment ######################################################
# $1: switch operation to be performed
# $2: device name
# TODO possibly really query if switch is or is not required
setenv() {
local switchop="$1"
local device="$2"
if ! build_validate "$device"; then
warning "System '$device' seems to be not build." >&2
return 1
fi
local store
store="$(readlink -f "$(result "$device")")"
stage "${switchop^} system: $device"
local cursystem
cursystem="$(_ssh "$device" readlink -f /nix/var/nix/profiles/system)"
if [ "$cursystem" != "$store" ]; then
info "-----------------------------------------------------------------"
_ssh "$device" \
nix store diff-closures "$cursystem" "$store"
info "-----------------------------------------------------------------"
local _store _switchop
printf -v _store '%q' "$store"
printf -v _switchop '%q' "$switchop"
_rootssh "$device" "$_store/bin/nixos-system $_switchop"
else
warning "The latest system might have been already set."
fi
}
boot() {
setenv boot "$1"
}
switch() {
setenv switch "$1"
}
switch_test() {
setenv test "$1"
}
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