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-rw-r--r--shell.nix60
1 files changed, 60 insertions, 0 deletions
diff --git a/shell.nix b/shell.nix
index 53b0f964a..cb251183f 100644
--- a/shell.nix
+++ b/shell.nix
@@ -7,6 +7,7 @@ let
#
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 = {
@@ -22,6 +23,65 @@ let
. ${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} \