Merge branch 'master' of http://cgit.lassul.us/stockholm into klauen-von-lass

6 files changed, 347 insertions, 242 deletions

diff --git a/krebs/3modules/ci.nix b/krebs/3modules/ci.nix
index adbc1ebe1..b56f5c543 100644
--- a/krebs/3modules/ci.nix
+++ b/krebs/3modules/ci.nix
@@ -104,7 +104,7 @@ in
                     "dummy_secrets": "true",
                   },
                   command=[
-                    "nix-shell", "--run", " ".join(["test",
+                    "nix-shell", "-I", "stockholm=.", "--run", " ".join(["test",
                       "--user={}".format(user),
                       "--system={}".format(host),
                       "--force-populate",
diff --git a/krebs/3modules/default.nix b/krebs/3modules/default.nix
index a8933e719..7cf02cd8b 100644
--- a/krebs/3modules/default.nix
+++ b/krebs/3modules/default.nix
@@ -61,6 +61,7 @@ let
 
     hosts = mkOption {
       type = with types; attrsOf host;
+      default = {};
     };
 
     users = mkOption {
diff --git a/krebs/5pkgs/haskell/nix-diff.nix b/krebs/5pkgs/haskell/nix-diff.nix
new file mode 100644
index 000000000..2070dbd2e
--- /dev/null
+++ b/krebs/5pkgs/haskell/nix-diff.nix
@@ -0,0 +1,22 @@
+{ mkDerivation, attoparsec, base, containers, Diff, fetchgit, mtl
+, nix-derivation, optparse-generic, stdenv, system-filepath, text
+, unix, vector
+}:
+mkDerivation {
+  pname = "nix-diff";
+  version = "1.0.0";
+  src = fetchgit {
+    url = "https://github.com/Gabriel439/nix-diff";
+    sha256 = "1k00nx8pannqmpzadkwfrs6bf79yk22ynhd033z5rsyw0m8fcz9k";
+    rev = "e32ffa2c7f38b47a71325a042c1d887fb46cdf7d";
+  };
+  isLibrary = false;
+  isExecutable = true;
+  executableHaskellDepends = [
+    attoparsec base containers Diff mtl nix-derivation optparse-generic
+    system-filepath text unix vector
+  ];
+  homepage = "https://github.com/Gabriel439/nix-diff";
+  description = "Explain why two Nix derivations differ";
+  license = stdenv.lib.licenses.bsd3;
+}
diff --git a/krebs/5pkgs/simple/stockholm/default.nix b/krebs/5pkgs/simple/stockholm/default.nix
new file mode 100644
index 000000000..5705f086d
--- /dev/null
+++ b/krebs/5pkgs/simple/stockholm/default.nix
@@ -0,0 +1,291 @@
+{ pkgs }: let
+
+  stockholm-dir = ../../../..;
+
+  lib = import (stockholm-dir + "/lib");
+
+  #
+  # high level commands
+  #
+
+  cmds.deploy = pkgs.withGetopt {
+    diff = { default = /* sh */ "false"; switch = true; };
+    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 "stockholm.deploy" ''
+    set -efu
+
+    . ${init.env}
+    . ${init.proxy "deploy" opts}
+
+    if \test ${opts.diff.ref} = true; then
+
+      system_profile=/nix/var/nix/profiles/system
+      system_drv_cur=/etc/system.drv
+
+      system_drv_new=$(
+        ${pkgs.nix}/bin/nix-instantiate \
+            -Q \
+            -I "$target_path" \
+            -E '
+              (import <nixpkgs/nixos/lib/eval-config.nix> {
+                modules = [ <nixos-config> ];
+              }).config.system.build.toplevel
+            '
+      )
+
+      if \test -e "$system_drv_cur"; then
+
+        system_drv_cur_c=$(${pkgs.coreutils}/bin/readlink -f "$system_drv_cur")
+        system_drv_new_c=$(${pkgs.coreutils}/bin/readlink -f "$system_drv_new")
+
+        if \test "$system_drv_cur_c" = "$system_drv_new_c"; then
+          echo "$0: system up to date" >&2
+          exit 0
+        fi
+
+        system_drv_cur=$system_drv_cur_c \
+        system_drv_new=$system_drv_new_c \
+        ${pkgs.utillinux}/bin/script \
+            --command '
+              ${pkgs.haskellPackages.nix-diff}/bin/nix-diff \
+                  "$system_drv_cur" "$system_drv_new"
+            ' \
+            --quiet \
+            --return \
+            /dev/null
+
+        printf 'deploy? [N/y] ' >&2
+        read -r REPLY
+        if \test "$REPLY" != y; then
+          echo "$0: abort!" >&2
+          exit 1
+        fi
+      else
+        echo "$0: --${opts.diff.long} has no effect because "$system_drv_cur" doesn't exist" >&2
+      fi
+
+      new_system=$(${pkgs.nix}/bin/nix-store --realize "$system_drv_new")
+
+      ${pkgs.nix}/bin/nix-env -p "$system_profile" --set "$new_system"
+      PATH=${lib.makeBinPath [
+        pkgs.systemd
+      ]} \
+      "$system_profile"/bin/switch-to-configuration switch
+
+      ${pkgs.coreutils}/bin/ln -fns "$system_drv_new" "$system_drv_cur"
+      exit
+    fi
+
+    # Use system's nixos-rebuild, which is not self-contained
+    export PATH=/run/current-system/sw/bin
+    exec ${utils.with-whatsupnix} \
+    nixos-rebuild switch \
+        --show-trace \
+        -I "$target_path"
+  '');
+
+  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 "stockholm.install" ''
+    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=$(${pkgs.quote}/bin/quote "$target_path") \
+              sh -s prepare \
+            < ${stockholm-dir + "/krebs/4lib/infest/prepare.sh"}
+              # TODO inline prepare.sh?
+    fi
+
+    . ${init.proxy "install" opts}
+
+    # these variables get defined by nix-shell (i.e. nix-build) from
+    # XDG_RUNTIME_DIR and reference the wrong directory (/run/user/0),
+    # which only exists on / and not at /mnt.
+    export NIX_BUILD_TOP=/tmp
+    export TEMPDIR=/tmp
+    export TEMP=/tmp
+    export TMPDIR=/tmp
+    export TMP=/tmp
+    export XDG_RUNTIME_DIR=/tmp
+
+    export NIXOS_CONFIG="$target_path/nixos-config"
+
+    cd
+    exec nixos-install
+  '');
+
+  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 "stockholm.test" /* sh */ ''
+    set -efu
+
+    export dummy_secrets=true
+
+    . ${init.env}
+    . ${init.proxy "test" opts}
+
+    exec ${utils.build} config.system.build.toplevel
+  '');
+
+  #
+  # low level commands
+  #
+
+  # usage: get-source SOURCE_FILE
+  cmds.get-source = pkgs.writeDash "stockholm.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]
+  cmds.parse-target = pkgs.withGetopt {
+    default_target = {
+      long = "default";
+      short = "d";
+    };
+  } (opts: pkgs.writeDash "stockholm.parse-target" ''
+    set -efu
+    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 ${pkgs.writeText "stockholm.parse-target.jq" ''
+          def parse: match("^(?:([^@]+)@)?([^:/]+)?(?::([0-9]+))?(/.*)?$") | {
+            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) }
+        ''}
+  '');
+
+  init.env = pkgs.writeText "init.env" /* sh */ ''
+
+    export HOSTNAME="$(${pkgs.nettools}/bin/hostname)"
+    export STOCKHOLM_VERSION="''${STOCKHOLM_VERSION-$(${shell.get-version})}"
+
+    export quiet
+    export system
+    export target
+    export user
+
+    default_target=root@$system:22/var/src
+
+    export target_object="$(
+      ${cmds.parse-target} "$target" -d "$default_target"
+    )"
+    export target_user="$(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 | ${pkgs.jq}/bin/jq -r .local)"
+  '';
+
+  init.proxy = command: opts: pkgs.writeText "init.proxy" /* sh */ ''
+    if \test "''${using_proxy-}" != true; then
+
+      source=$(${cmds.get-source} "$source_file")
+      qualified_target=$target_user@$target_host:$target_port$target_path
+      if \test "$force_populate" = true; then
+        echo "$source" | ${pkgs.populate}/bin/populate --force "$qualified_target"
+      else
+        echo "$source" | ${pkgs.populate}/bin/populate "$qualified_target"
+      fi
+
+      if \test "$target_local" != true; then
+        exec ${pkgs.openssh}/bin/ssh \
+            "$target_user@$target_host" -p "$target_port" \
+            cd "$target_path/stockholm" \; \
+            NIX_PATH=$(${pkgs.quote}/bin/quote "$target_path") \
+            STOCKHOLM_VERSION=$(${pkgs.quote}/bin/quote "$STOCKHOLM_VERSION") \
+            nix-shell --run "$(${pkgs.quote}/bin/quote "
+              ${lib.concatStringsSep " " (lib.mapAttrsToList
+                (name: opt: /* sh */
+                  "${opt.varname}=\$(${pkgs.quote}/bin/quote ${opt.ref})")
+                opts
+              )} \
+              using_proxy=true \
+              ${lib.shell.escape command} \
+              $WITHGETOPT_ORIG_ARGS \
+            ")"
+      fi
+    fi
+  '';
+
+  utils.build = pkgs.writeDash "utils.build" ''
+    set -efu
+    ${utils.with-whatsupnix} \
+    ${pkgs.nix}/bin/nix-build \
+        --no-out-link \
+        --show-trace \
+        -E "with import <stockholm>; $1" \
+        -I "$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
+  '';
+
+  shell.get-version = pkgs.writeDash "stockholm.get-version" ''
+    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.$version"
+  '';
+
+in
+
+  pkgs.writeOut "stockholm" (lib.mapAttrs' (name: link:
+    lib.nameValuePair "/bin/${name}" { inherit link; }
+  ) cmds)
diff --git a/lass/2configs/browsers.nix b/lass/2configs/browsers.nix
index 6c381863c..a858d3fec 100644
--- a/lass/2configs/browsers.nix
+++ b/lass/2configs/browsers.nix
@@ -5,19 +5,23 @@ let
 
   mainUser = config.users.extraUsers.mainUser;
 
-  browser-select = pkgs.writeScriptBin "browser-select" ''
-    BROWSER=$(echo -e "${concatStringsSep "\\n" (attrNames config.lass.browser.paths)}" | ${pkgs.dmenu}/bin/dmenu)
+  browser-select = let
+    sortedPaths = sort (a: b: a.value.precedence > b.value.precedence)
+                       (mapAttrsToList (name: value: { inherit name value; })
+                                       config.lass.browser.paths);
+  in pkgs.writeScriptBin "browser-select" ''
+    BROWSER=$(echo -e "${concatStringsSep "\\n" (map (getAttr "name") sortedPaths)}" | ${pkgs.dmenu}/bin/dmenu)
     case $BROWSER in
     ${concatMapStringsSep "\n" (n: ''
-      ${n})
-        export BIN=${config.lass.browser.paths.${n}}/bin/${n}
+      ${n.name})
+        export BIN=${n.value.path}/bin/${n.name}
         ;;
-    '') (attrNames config.lass.browser.paths)}
+    '') (sortedPaths)}
     esac
     $BIN "$@"
   '';
 
-  createChromiumUser = name: extraGroups:
+  createChromiumUser = name: extraGroups: precedence:
     let
       bin = pkgs.writeScriptBin name ''
         /var/run/wrappers/bin/sudo -u ${name} -i ${pkgs.chromium}/bin/chromium $@
@@ -31,7 +35,7 @@ let
         useDefaultShell = true;
         createHome = true;
       };
-      lass.browser.paths.${name} = bin;
+      lass.browser.paths.${name}.path = bin;
       security.sudo.extraConfig = ''
         ${mainUser.name} ALL=(${name}) NOPASSWD: ALL
       '';
@@ -40,7 +44,7 @@ let
       ];
     };
 
-  createFirefoxUser = name: extraGroups:
+  createFirefoxUser = name: extraGroups: precedence:
     let
       bin = pkgs.writeScriptBin name ''
         /var/run/wrappers/bin/sudo -u ${name} -i ${pkgs.firefox}/bin/firefox $@
@@ -54,7 +58,10 @@ let
         useDefaultShell = true;
         createHome = true;
       };
-      lass.browser.paths.${name} = bin;
+      lass.browser.paths.${name} = {
+        path = bin;
+        inherit precedence;
+      };
       security.sudo.extraConfig = ''
         ${mainUser.name} ALL=(${name}) NOPASSWD: ALL
       '';
@@ -79,14 +86,24 @@ in {
         type = types.path;
       };
       options.lass.browser.paths = mkOption {
-        type = with types; attrsOf path;
+        type = types.attrsOf (types.submodule ({
+          options = {
+            path = mkOption {
+              type = types.path;
+            };
+            precedence = mkOption {
+              type = types.int;
+              default = 0;
+            };
+          };
+        }));
       };
     }
-    ( createFirefoxUser "ff" [ "audio" ] )
-    ( createChromiumUser "cr" [ "video" "audio" ] )
+    ( createFirefoxUser "ff" [ "audio" ] 10 )
+    ( createChromiumUser "cr" [ "video" "audio" ] 9 )
+    ( createChromiumUser "gm" [ "video" "audio" ] 8 )
     ( createChromiumUser "wk" [ "video" "audio" ] )
     ( createChromiumUser "fb" [ "video" "audio" ] )
-    ( createChromiumUser "gm" [ "video" "audio" ] )
     ( createChromiumUser "com" [ "video" "audio" ] )
   ];
 }
diff --git a/shell.nix b/shell.nix
index 53b0f964a..bfdf1b3ca 100644
--- a/shell.nix
+++ b/shell.nix
@@ -2,239 +2,16 @@ let
   lib = import ./lib;
   pkgs = import <nixpkgs> { overlays = [(import ./krebs/5pkgs)]; };
 
-  #
-  # high level commands
-  #
-
-  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" ''
-    set -efu
-
-    . ${init.env}
-    . ${init.proxy "deploy" opts}
-
-    # Use system's nixos-rebuild, which is not self-contained
-    export PATH=/run/current-system/sw/bin
-    exec ${utils.with-whatsupnix} \
-    nixos-rebuild switch \
-        --show-trace \
-        -I "$target_path"
-  '');
-
-  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" ''
-    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
-
-    . ${init.proxy "install" opts}
-
-    # Reset PATH because we need access to nixos-install.
-    # TODO provide nixos-install instead of relying on prepare.sh
-    export PATH="$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="$target_path/nixos-config"
-
-    cd
-    exec nixos-install
-  '');
-
-  cmds.test = pkgs.withGetopt {
-    force-populate = { default = /* sh */ "false"; switch = true; };
-    quiet = { default = /* sh */ "false"; switch = true; };
-    source_file = {
-      default = /* sh */ "$user/1systems/$system/source.nix";
-      long = "source";
-    };
-    system = {};
-    target = {};
-    user.default = /* sh */ "$LOGNAME";
-  } (opts: pkgs.writeDash "cmds.test" /* sh */ ''
-    set -efu
-
-    export dummy_secrets=true
-
-    . ${init.env}
-    . ${init.proxy "test" opts}
-
-    exec ${utils.build} config.system.build.toplevel
-  '');
-
-  #
-  # 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]
-  cmds.parse-target = pkgs.withGetopt {
-    default_target = {
-      long = "default";
-      short = "d";
-    };
-  } (opts: pkgs.writeDash "cmds.parse-target" ''
-    set -efu
-    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) }
-        ''}
-  '');
-
-  init.env = pkgs.writeText "init.env" /* sh */ ''
-    export quiet
-    export system
-    export target
-    export user
-
-    default_target=root@$system:22/var/src
-
-    export target_object="$(parse-target "$target" -d "$default_target")"
-    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 | ${pkgs.jq}/bin/jq -r .local)"
-  '';
-
-  init.proxy = command: opts: pkgs.writeText "init.proxy" /* sh */ ''
-    if \test "''${using_proxy-}" != true; then
-
-      source=$(get-source "$source_file")
-      qualified_target=$target_user@$target_host:$target_port$target_path
-      if \test "$force_populate" = true; then
-        echo "$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 "
-              ${lib.concatStringsSep " " (lib.mapAttrsToList
-                (name: opt: /* sh */ "${opt.varname}=\$(quote ${opt.ref})")
-                opts
-              )} \
-              using_proxy=true \
-              ${lib.shell.escape command} \
-              $WITHGETOPT_ORIG_ARGS \
-            ")"
-      fi
-    fi
-  '';
-
-  utils.build = pkgs.writeDash "utils.build" ''
-    set -efu
-    ${utils.with-whatsupnix} \
-    ${pkgs.nix}/bin/nix-build \
-        --no-out-link \
-        --show-trace \
-        -E "with import <stockholm>; $1" \
-        -I "$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
-  '';
-
-  shell.get-version = pkgs.writeDash "shell.get-version" ''
-    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.$version"
-  '';
-
-  shell.cmdspkg = pkgs.writeOut "shell.cmdspkg" (lib.mapAttrs' (name: link:
-    lib.nameValuePair "/bin/${name}" { inherit link; }
-  ) cmds);
-
 in pkgs.stdenv.mkDerivation {
   name = "stockholm";
   shellHook = /* sh */ ''
-    export OLD_PATH="$PATH"
     export NIX_PATH=stockholm=${toString ./.}:nixpkgs=${toString <nixpkgs>}
     if test -e /nix/var/nix/daemon-socket/socket; then
       export NIX_REMOTE=daemon
     fi
     export PATH=${lib.makeBinPath [
-      pkgs.populate
-      pkgs.quote
-      shell.cmdspkg
-    ]}
+      pkgs.stockholm
+    ]}''${PATH+:$PATH}
 
     eval "$(declare -F | ${pkgs.gnused}/bin/sed s/declare/unset/)"
     shopt -u no_empty_cmd_completion
@@ -251,9 +28,6 @@ in pkgs.stdenv.mkDerivation {
       :
     }
 
-    export HOSTNAME="$(${pkgs.nettools}/bin/hostname)"
-    export STOCKHOLM_VERSION="''${STOCKHOLM_VERSION-$(${shell.get-version})}"
-
     PS1='\[\e[38;5;162m\]\w\[\e[0m\] '
   '';
 }