factor out xdg-user-dirs feature

This script hook used to lurk in live feature but was deemed needed
in cubox images too; thus it's time to move it into a standalone
feature (maybe a configurable one, even).

Thanks glebfm@ for initial shot and sem@ for discussion.

conf.d/armh.mk

@@ -35,8 +35,8 @@ vm/.arm-base: profile/bare use/kernel use/net-eth/dhcp use/vm-ssh; @:
 	@$(call add,BASE_PACKAGES,mkinitrd uboot-tools)
 	@$(call set,BRANDING,altlinux-kdesktop)
 
-vm/.cubox-bare: vm/.arm-base use/armh use/armh-cubox use/services/ssh \
-	use/cleanup/installer use/repo use/branding +systemd
+vm/.cubox-bare: vm/.arm-base use/armh use/armh-cubox use/services/ssh +systemd \
+	use/cleanup/installer use/repo use/branding use/xdg-user-dirs/deep
 	@$(call set,KFLAVOURS,cubox)
 	@$(call set,BRANDING,altlinux-kdesktop)
 	@$(call add,THE_BRANDING,alterator graphics indexhtml menu notes)

features.in/live/config.mk

@@ -26,7 +26,8 @@ use/live/x11: use/live/base use/x11-autologin use/live/sound +power +efi
 	@$(call add,SYSLINUX_CFG,localboot)
 
 # this target specifically pulls free xorg drivers in (and a few more bits)
-use/live/desktop: use/live/x11 use/x11/xorg use/x11/wacom +vmguest; @:
+use/live/desktop: use/live/x11 use/x11/xorg use/x11/wacom \
+	use/xdg-user-dirs/deep +vmguest; @:
 
 # preconfigure apt for both live and installed-from-live systems
 use/live/repo: use/live

features.in/live/live/image-scripts.d/35-xdg-user-dirs

@@ -1,12 +0,0 @@
-#!/bin/sh
-# Turn on xdg-user-dirs.
-# NB: not yet available on t6/p6 hence the warning
-
-. shell-config
-
-if control xdg-user-dirs enabled; then
-	shell_config_set /etc/xdg/user-dirs.defaults MOVIES 'Documents/Videos'
-	shell_config_set /etc/xdg/user-dirs.defaults PHOTOS 'Documents/Pictures'
-else
-	echo "** warning: control xdg-user-dirs failed" >&2
-fi

features.in/xdg-user-dirs/README

@@ -0,0 +1,5 @@
+Эта фича обеспечивает наличие "ручки" для конфигурирования
+типовых пользовательских каталогов для нескольких типов данных
+и предоставляет возможность задавать предпочитаемые умолчания,
+которые могут различаться по дистрибутивам; см. тж.
+http://freedesktop.org/wiki/Software/xdg-user-dirs

features.in/xdg-user-dirs/config.mk

@@ -0,0 +1,9 @@
+use/xdg-user-dirs:
+	@$(call add_feature)
+	@$(call add,THE_PACKAGES,xdg-user-dirs)
+	@$(call xport,XDG_USER_DIRS)
+
+# tweak some values to move these dirs into Documents/
+use/xdg-user-dirs/deep: use/xdg-user-dirs
+	@$(call add,XDG_USER_DIRS,MOVIES:Documents/Videos)
+	@$(call add,XDG_USER_DIRS,PHOTOS:Documents/Pictures)

features.in/xdg-user-dirs/rootfs/image-scripts.d/35-xdg-user-dirs

@@ -0,0 +1,18 @@
+#!/bin/sh
+# turn on xdg-user-dirs.and tweak its defaults if told so
+# (using tuples like "PHOTOS:Documents/Pictures")
+
+. shell-config
+
+CONFIG="/etc/xdg/user-dirs.defaults"
+
+if control xdg-user-dirs enabled; then
+	if [ -n "$GLOBAL_XDG_USER_DIRS" ]; then
+		echo "$GLOBAL_XDG_USER_DIRS" \
+		| tr ' ' '\n' \
+		| while IFS=':' read k v; do
+			[ -n "$k" -a -n "$v" ] || continue
+			shell_config_set "$CONFIG" "$k" "$v"
+		done
+	fi
+fi