opkg: run prerm scripts for the old version also on upgrade

To make sure we properly restart services on upgrade we need to
call the prerm script of the old package, in case the init script
changes (or vanishes).

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Acked-by: Jo-Philipp Wich <jo@mein.io>

package/system/opkg/Makefile

@@ -13,7 +13,7 @@ include $(INCLUDE_DIR)/feeds.mk
 PKG_NAME:=opkg
 PKG_REV:=9c97d5ecd795709c8584e972bfdf3aee3a5b846d
 PKG_VERSION:=$(PKG_REV)
-PKG_RELEASE:=14
+PKG_RELEASE:=15
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_VERSION:=$(PKG_REV)

package/system/opkg/patches/280-call-prerm-and-postrm-scripts-on-upgrade.patch

@@ -0,0 +1,73 @@
+From a8555d352d2851ee1482b74b57ba9eacfb354c18 Mon Sep 17 00:00:00 2001
+From: Peter Urbanec <peteru@urbanec.net>
+Date: Thu, 23 Oct 2014 01:05:35 +1100
+Subject: [PATCH] opkg_install: Call prerm and postrm scripts on package
+ upgrade
+
+When upgrading a package from v1 to v2, run "v1-prerm upgrade v2" and
+"v1-postrm upgrade v2", similarly to what dpkg does.
+
+This patch fixes issue 104.
+
+Signed-off-by: Peter Urbanec <openembedded-devel@urbanec.net>
+Signed-off-by: Paul Barker <paul@paulbarker.me.uk>
+---
+ libopkg/opkg_install.c | 40 ++++++++++++++++++++++++++++++++++++++--
+ 1 file changed, 38 insertions(+), 2 deletions(-)
+
+--- a/libopkg/opkg_install.c
++++ b/libopkg/opkg_install.c
+@@ -528,7 +528,25 @@ prerm_upgrade_old_pkg(pkg_t *pkg, pkg_t
+ 	   Error unwind, for both the above cases:
+ 	   old-postinst abort-upgrade new-version
+      */
+-     return 0;
++    int err;
++    char *script_args;
++    char *new_version;
++
++    if (!old_pkg || !pkg)
++        return 0;
++
++    new_version = pkg_version_str_alloc(pkg);
++
++    sprintf_alloc(&script_args, "upgrade %s", new_version);
++    free(new_version);
++    err = pkg_run_script(old_pkg, "prerm", script_args);
++    free(script_args);
++    if (err != 0) {
++        opkg_msg(ERROR, "prerm script for package \"%s\" failed\n",
++                 old_pkg->name);
++        return -1;
++    }
++    return 0;
+ }
+ 
+ static int
+@@ -925,7 +943,25 @@ postrm_upgrade_old_pkg(pkg_t *pkg, pkg_t
+ 	   new-postrm failed-upgrade old-version
+ 	Error unwind, for both cases:
+ 	   old-preinst abort-upgrade new-version    */
+-     return 0;
++    int err;
++    char *script_args;
++    char *new_version;
++
++    if (!old_pkg || !pkg)
++        return 0;
++
++    new_version = pkg_version_str_alloc(pkg);
++
++    sprintf_alloc(&script_args, "upgrade %s", new_version);
++    free(new_version);
++    err = pkg_run_script(old_pkg, "postrm", script_args);
++    free(script_args);
++    if (err != 0) {
++        opkg_msg(ERROR, "postrm script for package \"%s\" failed\n",
++                 old_pkg->name);
++        return -1;
++    }
++    return 0;
+ }
+ 
+ static int