From d6dbc22bbcde78bbc378ca3f006771a2b074ff2e Mon Sep 17 00:00:00 2001
From: John Crispin <john@openwrt.org>
Date: Thu, 11 Sep 2014 12:27:49 +0000
Subject: [PATCH] ipkg: add a default postinst/prerm script

the postinst script enables/starts the init.d scripts upon package installation
and installs the users required by the package.

the prerm script stops and disables the init.d scripts.

Signed-off-by: John Crispin <blogic@openwrt.org>

SVN-Revision: 42470
---
 include/package-ipkg.mk                   | 17 ++++-
 package/Makefile                          |  3 +-
 package/base-files/files/lib/functions.sh | 77 ++++++++++++++++++++++-
 3 files changed, 92 insertions(+), 5 deletions(-)

diff --git a/include/package-ipkg.mk b/include/package-ipkg.mk
index 1caeaa25b6..494444613a 100644
--- a/include/package-ipkg.mk
+++ b/include/package-ipkg.mk
@@ -16,7 +16,7 @@ IPKG_STATE_DIR:=$(TARGET_DIR)/usr/lib/opkg
 define BuildIPKGVariable
 ifdef Package/$(1)/$(2)
   $(call shexport,Package/$(1)/$(2))
-  $(1)_COMMANDS += var2file "$(call shvar,Package/$(1)/$(2))" $(2);
+  $(1)_COMMANDS += var2file "$(call shvar,Package/$(1)/$(2))" $(2)$(3);
 endif
 endef
 
@@ -117,8 +117,8 @@ ifeq ($(DUMP),)
 
     $(eval $(call BuildIPKGVariable,$(1),conffiles))
     $(eval $(call BuildIPKGVariable,$(1),preinst))
-    $(eval $(call BuildIPKGVariable,$(1),postinst))
-    $(eval $(call BuildIPKGVariable,$(1),prerm))
+    $(eval $(call BuildIPKGVariable,$(1),postinst,-pkg))
+    $(eval $(call BuildIPKGVariable,$(1),prerm,-pkg))
     $(eval $(call BuildIPKGVariable,$(1),postrm))
 
     $(STAGING_DIR_ROOT)/stamp/.$(1)_installed: $(STAMP_BUILT)
@@ -174,6 +174,17 @@ ifeq ($(DUMP),)
 		echo -n "Description: "; $(SH_FUNC) getvar $(call shvar,Package/$(1)/description) | sed -e 's,^[[:space:]]*, ,g'; \
  	) > $$(IDIR_$(1))/CONTROL/control
 	chmod 644 $$(IDIR_$(1))/CONTROL/control
+	( \
+		echo "#!/bin/sh"; \
+		echo ". \$$$${IPKG_INSTROOT}/lib/functions.sh"; \
+		echo "default_postinst \$$$$0 \$$$$@"; \
+	) > $$(IDIR_$(1))/CONTROL/postinst
+	( \
+		echo "#!/bin/sh"; \
+		echo ". \$$$${IPKG_INSTROOT}/lib/functions.sh"; \
+		echo "default_prerm \$$$$0 \$$$$@"; \
+	) > $$(IDIR_$(1))/CONTROL/prerm
+	chmod 0755 $$(IDIR_$(1))/CONTROL/prerm
 	$(SH_FUNC) (cd $$(IDIR_$(1))/CONTROL; \
 		$($(1)_COMMANDS) \
 	)
diff --git a/package/Makefile b/package/Makefile
index 0cba878576..a42b4b0dd0 100644
--- a/package/Makefile
+++ b/package/Makefile
@@ -116,7 +116,8 @@ $(curdir)/install: $(TMP_DIR)/.build
 	@-find $(TARGET_DIR) -name CVS   | $(XARGS) rm -rf
 	@-find $(TARGET_DIR) -name .svn  | $(XARGS) rm -rf
 	@-find $(TARGET_DIR) -name '.#*' | $(XARGS) rm -f
-	rm -f $(TARGET_DIR)/usr/lib/opkg/info/*.postinst
+	rm -f $(TARGET_DIR)/usr/lib/opkg/info/*.postinst*
+	rm -f $(TARGET_DIR)/usr/lib/opkg/info/*.prerm*
 	$(if $(CONFIG_CLEAN_IPKG),rm -rf $(TARGET_DIR)/usr/lib/opkg)
 	$(call mklibs)
 
diff --git a/package/base-files/files/lib/functions.sh b/package/base-files/files/lib/functions.sh
index 0d4b2a33db..67f4a046e5 100755
--- a/package/base-files/files/lib/functions.sh
+++ b/package/base-files/files/lib/functions.sh
@@ -160,6 +160,50 @@ insert_modules() {
 	}
 }
 
+default_prerm() {
+	local name
+	name=$(echo $(basename $1) | cut -d. -f1)
+	[ -f /usr/lib/opkg/info/${name}.prerm-pkg ] && . /usr/lib/opkg/info/${name}.prerm-pkg
+	for i in `cat /usr/lib/opkg/info/${name}.list | grep "^/etc/init.d/"`; do
+		$i disable
+		$i stop
+	done
+}
+
+default_postinst() {
+	local name rusers
+	name=$(echo $(basename $1) | cut -d. -f1)
+	[ -f ${IPKG_INSTROOT}/usr/lib/opkg/info/${name}.postinst-pkg ] && . ${IPKG_INSTROOT}/usr/lib/opkg/info/${name}.postinst-pkg
+	rusers=$(grep "Require-User:" ${IPKG_INSTROOT}/usr/lib/opkg/info/${name}.control)
+	[ -n "$rusers" ] && {
+		local user group
+		for a in $(echo $rusers | sed "s/Require-User://g"); do
+			user=""
+			group=""
+			for b in $(echo $a | sed "s/:/ /g"); do
+				[ -z "$user" ] && {
+					user=$b
+					continue
+				}
+				[ -z "$group" ] && {
+					group=$b
+					group_add_next $b
+					gid=$?
+					user_exists $user || user_add $user "" $gid
+					continue
+				}
+				group_add_next $b
+				group_add_user $b $user
+			done
+		done
+	}
+	[ -n "${IPKG_INSTROOT}" -o "$PKG_UPGRADE" = "1" ] || for i in `cat /usr/lib/opkg/info/${name}.list | grep "^/etc/init.d/"`; do
+		$i enable
+		$i start
+	done
+	return 0
+}
+
 include() {
 	local file
 
@@ -199,14 +243,45 @@ group_exists() {
 	grep -qs "^${1}:" ${IPKG_INSTROOT}/etc/group
 }
 
+group_add_next() {
+	local gid gids
+	gid=$(grep -s "^${1}:" ${IPKG_INSTROOT}/etc/group | cut -d: -f3)
+	[ -n "$gid" ] && return $gid
+	gids=$(cat ${IPKG_INSTROOT}/etc/group | cut -d: -f3)
+	gid=100
+	while [ -n "$(echo $gids | grep $gid)" ] ; do
+	        gid=$((gid + 1))
+	done
+	group_add $1 $gid
+	return $gid
+}
+
+group_add_user() {
+	local grp delim=","
+	grp=$(grep -s "^${1}:" ${IPKG_INSTROOT}/etc/group)
+	[ -z "$(echo $grp | cut -d: -f4 | grep $2)" ] || return
+	[ -n "$(echo $grp | grep ":$")" ] && delim=""
+	[ -n "$IPKG_INSTROOT" ] || lock /var/lock/passwd
+	sed -i "s/$grp/$grp$delim$2/g" ${IPKG_INSTROOT}/etc/group
+	[ -n "$IPKG_INSTROOT" ] || lock -u /var/lock/passwd
+}
+
 user_add() {
 	local name="${1}"
 	local uid="${2}"
-	local gid="${3:-$2}"
+	local gid="${3}"
 	local desc="${4:-$1}"
 	local home="${5:-/var/run/$1}"
 	local shell="${6:-/bin/false}"
 	local rc
+	[ -z "$uid" ] && {
+		uids=$(cat ${IPKG_INSTROOT}/etc/passwd | cut -d: -f3)
+		uid=100
+		while [ -n "$(echo $uids | grep $uid)" ] ; do
+		        uid=$((uid + 1))
+		done
+	}
+	[ -z "$gid" ] && gid=$uid
 	[ -f "${IPKG_INSTROOT}/etc/passwd" ] || return 1
 	[ -n "$IPKG_INSTROOT" ] || lock /var/lock/passwd
 	echo "${name}:x:${uid}:${gid}:${desc}:${home}:${shell}" >> ${IPKG_INSTROOT}/etc/passwd