Add upgrade & remove operations

miniguest/functions.bash

@@ -16,7 +16,7 @@
 # along with Miniguest.  If not, see <https://www.gnu.org/licenses/>.
 
 function run_nix {
-	command "$nix" --experimental-features "nix-command flakes" "$@"
+	command "$nix" --experimental-features "nix-command flakes ca-references" "$@"
 }
 
 flake=
@@ -27,3 +27,34 @@ function parse_flake_reference {
 	flake="${BASH_REMATCH[1]}"
 	guest_name="${BASH_REMATCH[2]}"
 }
+
+function install_profile {
+	[[ $# -eq 2 ]] || die "$FUNCNAME: wrong number of arguments!"
+	local guest_name="$1"
+	local target="$2"
+	run_nix profile install --profile "$profiles_dir/$guest_name" "$target" ||
+		die "unable to install $guest_name!" $?
+}
+
+function upgrade_profile {
+	[[ $# -eq 1 ]] || die "$FUNCNAME: wrong number of arguments!"
+	local guest_name="$1"
+	run_nix profile upgrade --profile "$guests_dir/$guest_name" ||
+		die "unable to upgrade $guest_name!" $?
+}
+
+function reset_profile {
+	[[ $# -eq 1 ]] || die "$FUNCNAME: wrong number of arguments!"
+	local guest_name="$1"
+	run_nix profile remove --profile "$profiles_dir/$guest_name" '.*' ||
+		die "unable to remove guest!" $?
+}
+
+function have_control_of_symlink {
+	[[ $# -eq 1 ]] || die "$FUNCNAME: wrong number of arguments!"
+	local symlink="$guests_dir/$guest_name"
+	[[ ! -e $symlink || -L $symlink && $(readlink $symlink) -ef "$profiles_dir/$guest_name" ]] || {
+		echo >&2 "not touching $guests_dir/$guest_name because it's not in an expected state"
+		false
+	}
+}

miniguest/install.bash

@@ -21,5 +21,8 @@ parse_flake_reference "$_arg_flake_reference"
 
 mkdir -p "$guests_dir" || die "" $?
 mkdir -p "$profiles_dir" || die "" $?
-run_nix build --profile "$profiles_dir/$guest_name" "$flake#nixosConfigurations.$guest_name.config.system.build.miniguest" || die "unable to build guest!" $?
-ln -sf "$profiles_dir/$guest_name" "$guests_dir" || die "" $?
+
+reset_profile "$guest_name" # FIXME: need an atomic reset-and-install
+install_profile "$guest_name" "$flake#nixosConfigurations.$guest_name.config.system.build.miniguest"
+
+have_control_of_symlink "$guest_name" && ln -sf "$profiles_dir/$guest_name" "$guests_dir"

miniguest/main.bash

@@ -25,6 +25,14 @@ nix="$_arg_nix"
 
 source functions.bash
 
-if test "${_arg_command:?}" = install; then
+case "${_arg_command:?}" in
+install)
 	source install.bash "${_arg_leftovers[@]}"
-fi
+	;;
+upgrade)
+	source upgrade.bash "${_arg_leftovers[@]}"
+	;;
+remove)
+	source remove.bash "${_arg_leftovers[@]}"
+	;;
+esac

miniguest/main_arg.bash

@@ -16,7 +16,7 @@
 # along with Miniguest.  If not, see <https://www.gnu.org/licenses/>.
 
 # ARG_POSITIONAL_SINGLE(command, subcommand to run)
-# ARG_TYPE_GROUP_SET(commands, COMMAND, command, [install,help])
+# ARG_TYPE_GROUP_SET(commands, COMMAND, command, [install,upgrade,remove,help])
 # ARG_OPTIONAL_SINGLE(guests-dir, , directory containing guests profiles, /etc/miniguests)
 # ARG_OPTIONAL_SINGLE(nix, , path to the nix binary, @nixFlakes@/bin/nix)
 # ARG_LEFTOVERS(subcommand arguments)

miniguest/remove.bash

@@ -0,0 +1,7 @@
+source remove_arg.bash
+
+guest_name="$_arg_guest_name"
+
+reset_profile "$guest_name"
+
+have_control_of_symlink "$guest_name" && rm -f "$guests_dir/$guest_name"

miniguest/remove_arg.bash

@@ -0,0 +1,2 @@
+# ARG_POSITIONAL_SINGLE(guest-name, name of guest to remove)
+# ARGBASH_GO

miniguest/upgrade.bash

@@ -0,0 +1,5 @@
+source upgrade_arg.bash
+
+guest_name="$_arg_guest_name"
+
+upgrade_profile "$guest_name"

miniguest/upgrade_arg.bash

@@ -0,0 +1,2 @@
+# ARG_POSITIONAL_SINGLE(guest-name, name of guest to upgrade)
+# ARGBASH_GO