[Buildroot] [PATCH 4/6] package/cups: Add udev rules to assign usb printers group to lp

[Angelo Compagnucci <angelo@amarulasolutions.com>]

This patch is based on patch from the rockchip tree:

commit c8a337593660f27379c30248a11bf08dc8712113
Author: Jeffy Chen <jeffy.chen@rock-chips.com>
Date:   Tue Nov 13 18:59:43 2018 +0800

    package: cups: Add udev rules to assign usb printers' group to lp

    Change-Id: Ieae17deaa7d3623e1f0e1cc826871f1719d98d88
    Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>

but fixes the missing lp user and group.

Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Angelo Compagnucci <angelo@amarulasolutions.com>
---
 package/cups/70-usb-printers.rules |  4 ++++
 package/cups/cups.mk               | 14 ++++++++++++++
 2 files changed, 18 insertions(+)
 create mode 100644 package/cups/70-usb-printers.rules

diff --git a/package/cups/70-usb-printers.rules b/package/cups/70-usb-printers.rules
new file mode 100644
index 0000000000..537645523d
--- /dev/null
+++ b/package/cups/70-usb-printers.rules
@@ -0,0 +1,4 @@
+# Allow USB printers in the lp group
+# Match rules converted from usblp.c driver's usblp_ids
+ACTION=="add", SUBSYSTEM=="usb", ATTR{bInterfaceClass}=="07", ATTR{bInterfaceSubClass}=="01", GROUP="lp"
+ACTION=="add", SUBSYSTEM=="usb", ATTRS{idVendor}=="04b8", ATTRS{idProduct}=="0202", GROUP="lp"
diff --git a/package/cups/cups.mk b/package/cups/cups.mk
index 461e0d9143..d4356682bf 100644
--- a/package/cups/cups.mk
+++ b/package/cups/cups.mk
@@ -72,10 +72,24 @@ else
 CUPS_CONF_OPTS += --disable-avahi
 endif
 
+ifeq ($(BR2_PACKAGE_HAS_UDEV),y)
+define CUPS_INSTALL_UDEV_RULES
+	$(INSTALL) -D -m 0644 package/cups/70-usb-printers.rules \
+		$(TARGET_DIR)/lib/udev/rules.d/70-usb-printers.rules
+endef
+
+CUPS_POST_INSTALL_TARGET_HOOKS += CUPS_INSTALL_UDEV_RULES
+endif
+
 define CUPS_INSTALL_INIT_SYSV
 	@$(RM) $(TARGET_DIR)/etc/init.d/cups
 	$(INSTALL) -D -m 0755 package/cups/S81cupsd \
 		$(TARGET_DIR)/etc/init.d/S81cupsd
 endef
 
+define CUPS_USERS
+	lp -1 lp -1 * /var/spool/lpd /bin/false - lp
+	- - lpadmin -1 * - - - Printers admin group.
+endef
+
 $(eval $(autotools-package))
-- 
2.25.1