Require >=push-v2.0 to provide a more descriptive error message

ChangeLog

@@ -1,5 +1,9 @@
 # ChangeLog for zram-init:
 
+*zram-init-5.0.0:
+	Martin Väth <martin at mvath.de>:
+	- Require >=push-v2.0 to provide a more descriptive error message
+
 *zram-init-4.0.0:
 	Martin Väth <martin at mvath.de>:
 	- New options -K -M -2 -Z for generic argument passing; usage requires

README

@@ -12,7 +12,8 @@ Currently, this is not a dependency: a manual method is provided as a fallback.
 The latter might be removed in a future release of this script.
 
 If you want to use one of the options -K -M -2 -Z to pass generic args,
-you need push.sh in your $PATH, see see https://github.com/vaeth/push/
+you need push.sh (v2.0 or newer) in your $PATH, see
+https://github.com/vaeth/push/
 
 To install this script, just copy the content of sbin into root's $PATH.
 To obtain support for zsh completion, copy the content of zsh to zsh's $fpath.

sbin/zram-init

@@ -19,7 +19,9 @@ Fatal() {
 }
 
 Push() {
-	. push.sh
+	PushA_=`push.sh 2>/dev/null` || Fatal \
+"push.sh from https://github.com/vaeth/push (v2.0 or newer) required"
+	eval "$PushA_"
 	Push "$@"
 }