stockholm/shell.nix

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let
lib = import ./lib;
pkgs = import <nixpkgs> { overlays = [(import ./krebs/5pkgs)]; };
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#
# high level commands
#
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cmds.deploy = pkgs.withGetopt {
force-populate = { default = /* sh */ "false"; switch = true; };
quiet = { default = /* sh */ "false"; switch = true; };
source_file = {
default = /* sh */ "$user/1systems/$system/source.nix";
long = "source";
};
system = {};
target.default = /* sh */ "$system";
user.default = /* sh */ "$LOGNAME";
} (opts: pkgs.writeDash "cmds.deploy" ''
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set -efu
. ${init.env}
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. ${init.proxy opts}
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exec ${utils.deploy}
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'');
cmds.install = pkgs.withGetopt {
force-populate = { default = /* sh */ "false"; switch = true; };
quiet = { default = /* sh */ "false"; switch = true; };
source_file = {
default = /* sh */ "$user/1systems/$system/source.nix";
long = "source";
};
system = {};
target = {};
user.default = /* sh */ "$LOGNAME";
} (opts: pkgs.writeBash "cmds.install" ''
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set -efu
. ${init.env}
if \test "''${using_proxy-}" != true; then
${pkgs.openssh}/bin/ssh \
-o StrictHostKeyChecking=no \
-o UserKnownHostsFile=/dev/null \
"$target_user@$target_host" -p "$target_port" \
env target_path=$(quote "$target_path") \
sh -s prepare < ${./krebs/4lib/infest/prepare.sh}
# TODO inline prepare.sh?
fi
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. ${init.proxy opts}
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# Reset PATH because we need access to nixos-install.
# TODO provide nixos-install instead of relying on prepare.sh
export PATH="$OLD_PATH"
# these variables get defined by nix-shell (i.e. nix-build) from
# XDG_RUNTIME_DIR and reference the wrong directory (/run/user/0),
# which only exists on / and not at /mnt.
export NIX_BUILD_TOP=/tmp
export TEMPDIR=/tmp
export TEMP=/tmp
export TMPDIR=/tmp
export TMP=/tmp
export XDG_RUNTIME_DIR=/tmp
export NIXOS_CONFIG="$target_path/nixos-config"
cd
exec nixos-install
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'');
cmds.test = pkgs.withGetopt {
force-populate = { default = /* sh */ "false"; switch = true; };
quiet = { default = /* sh */ "false"; switch = true; };
source_file = {
default = /* sh */ "$user/1systems/$system/source.nix";
long = "source";
};
system = {};
target = {};
user.default = /* sh */ "$LOGNAME";
} (opts: pkgs.writeDash "cmds.test" /* sh */ ''
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set -efu
export dummy_secrets=true
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. ${init.env}
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. ${init.proxy opts}
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exec ${utils.build} config.system.build.toplevel
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'');
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#
# low level commands
#
# usage: get-source SOURCE_FILE
cmds.get-source = pkgs.writeDash "cmds.get-source" ''
set -efu
exec ${pkgs.nix}/bin/nix-instantiate \
--eval \
--json \
--readonly-mode \
--show-trace \
--strict \
"$1"
'';
# usage: parse-target [--default=TARGET] TARGET
# TARGET = [USER@]HOST[:PORT][/PATH]
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cmds.parse-target = pkgs.writeDash "cmds.parse-target" ''
set -efu
args=$(${pkgs.utillinux}/bin/getopt -n "$0" -s sh \
-o d: \
-l default: \
-- "$@")
if \test $? != 0; then exit 1; fi
eval set -- "$args"
default_target=
while :; do case $1 in
-d|--default) default_target=$2; shift 2;;
--) shift; break;;
esac; done
target=$1; shift
for arg; do echo "$0: bad argument: $arg" >&2; done
if \test $# != 0; then exit 2; fi
exec ${pkgs.jq}/bin/jq \
-enr \
--arg default_target "$default_target" \
--arg target "$target" \
-f ${pkgs.writeText "cmds.parse-target.jq" ''
def parse: match("^(?:([^@]+)@)?([^:/]+)?(?::([0-9]+))?(/.*)?$") | {
user: .captures[0].string,
host: .captures[1].string,
port: .captures[2].string,
path: .captures[3].string,
};
def sanitize: with_entries(select(.value != null));
($default_target | parse) + ($target | parse | sanitize) |
. + { local: (.user == env.LOGNAME and .host == env.HOSTNAME) }
''}
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'';
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# usage: quote [ARGS...]
cmds.quote = pkgs.writeDash "cmds.quote" ''
set -efu
prefix=
for x; do
y=$(${pkgs.jq}/bin/jq -nr --arg x "$x" '$x | @sh "\(.)"')
echo -n "$prefix$y"
prefix=' '
done
echo
'';
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init.env = pkgs.writeText "init.env" /* sh */ ''
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export quiet
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export system
export target
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export user
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default_target=root@$system:22/var/src
export target_object="$(parse-target "$target" -d "$default_target")"
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export target_user="$(echo $target_object | ${pkgs.jq}/bin/jq -r .user)"
export target_host="$(echo $target_object | ${pkgs.jq}/bin/jq -r .host)"
export target_port="$(echo $target_object | ${pkgs.jq}/bin/jq -r .port)"
export target_path="$(echo $target_object | ${pkgs.jq}/bin/jq -r .path)"
export target_local="$(echo $target_object | ${pkgs.jq}/bin/jq -r .local)"
'';
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init.proxy = opts: pkgs.writeText "init.proxy" /* sh */ ''
if \test "''${using_proxy-}" != true; then
source=$(get-source "$source_file")
qualified_target=$target_user@$target_host:$target_port$target_path
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if \test "$force_populate" = true; then
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echo "$source" | populate --force "$qualified_target"
else
echo "$source" | populate "$qualified_target"
fi
if \test "$target_local" != true; then
exec ${pkgs.openssh}/bin/ssh \
"$target_user@$target_host" -p "$target_port" \
cd "$target_path/stockholm" \; \
NIX_PATH=$(quote "$target_path") \
STOCKHOLM_VERSION=$(quote "$STOCKHOLM_VERSION") \
nix-shell --run "$(quote "
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${lib.concatStringsSep " " (lib.mapAttrsToList
(name: opt: /* sh */ "${opt.varname}=\$(quote ${opt.ref})")
opts
)} \
using_proxy=true \
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$(quote "$0" "$@")
")"
fi
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fi
'';
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utils.build = pkgs.writeDash "utils.build" ''
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set -efu
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${utils.with-whatsupnix} \
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${pkgs.nix}/bin/nix-build \
--no-out-link \
--show-trace \
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-E "with import <stockholm>; $1" \
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-I "$target_path" \
'';
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utils.deploy = pkgs.writeDash "utils.deploy" ''
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set -efu
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# Use system's nixos-rebuild, which is not self-contained
export PATH=/run/current-system/sw/bin
${utils.with-whatsupnix} \
nixos-rebuild switch \
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--show-trace \
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-I "$target_path"
'';
utils.with-whatsupnix = pkgs.writeDash "utils.with-whatsupnix" ''
set -efu
if \test "$quiet" = true; then
"$@" -Q 2>&1 | ${pkgs.whatsupnix}/bin/whatsupnix
else
exec "$@"
fi
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'';
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shell.get-version = pkgs.writeDash "shell.get-version" ''
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set -efu
version=git.$(${pkgs.git}/bin/git describe --always --dirty)
case $version in (*-dirty)
version=$version@$HOSTNAME
esac
date=$(${pkgs.coreutils}/bin/date +%y.%m)
echo "$date.$version"
'';
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shell.cmdspkg = pkgs.writeOut "shell.cmdspkg" (lib.mapAttrs' (name: link:
lib.nameValuePair "/bin/${name}" { inherit link; }
) cmds);
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in pkgs.stdenv.mkDerivation {
name = "stockholm";
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shellHook = /* sh */ ''
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export OLD_PATH="$PATH"
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export NIX_PATH=stockholm=${toString ./.}:nixpkgs=${toString <nixpkgs>}
if test -e /nix/var/nix/daemon-socket/socket; then
export NIX_REMOTE=daemon
fi
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export PATH=${lib.makeBinPath [
pkgs.populate
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shell.cmdspkg
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]}
eval "$(declare -F | ${pkgs.gnused}/bin/sed s/declare/unset/)"
shopt -u no_empty_cmd_completion
unalias -a
enable -n \
. [ alias bg bind break builtin caller cd command compgen complete \
compopt continue dirs disown eval exec false fc fg getopts hash \
help history jobs kill let local logout mapfile popd printf pushd \
pwd read readarray readonly shift source suspend test times trap \
true typeset ulimit umask unalias wait
exitHandler() {
:
}
export HOSTNAME="$(${pkgs.nettools}/bin/hostname)"
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export STOCKHOLM_VERSION="''${STOCKHOLM_VERSION-$(${shell.get-version})}"
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PS1='\[\e[38;5;162m\]\w\[\e[0m\] '
'';
}