Created tryWget() to allow the easy use of the package wget(1)

This function will retrieve the proxy configuration and call the appropriate
wget(1), i.e. the system wget(1) if available, or the package wget(1).

Also, it will be easier to call wget(1) in any script of the package.

Signed-off-by: Vinicius Ruoso <vkr07@c3sl.ufpr.br>
Acked-by: Erik Alexandre Pucci <eap08@c3sl.ufpr.br>
Acked-by: Diego Giovane Pasqualin <dgp06@c3sl.ufpr.br>
Signed-off-by: Danilo K. S. Yorinori <danilok@c3sl.ufpr.br>

common.sh

@@ -36,3 +36,24 @@ function getProxyConf()
     puid=$(grep "^puid=" ${PROXYCONF} | cut -f2 -d=)
     ppasswd=$(grep "^ppasswd=" ${PROXYCONF} | cut -f2 -d=)
 }
+
+function tryWget(){
+    getProxyConf
+    if test -z "$phost"; then
+        PROXY=""
+    else
+        PROXY="http://${phost}:${pport}"
+    fi
+
+    if which wget &>/dev/null; then
+        WGETBIN="$(which wget)"
+    else
+        WGETBIN="${PREFIX}/bin/wget"
+    fi
+
+    http_proxy="${PROXY}" ${WGETBIN} --tries=${UPDATETRIES} \
+                                     --timeout=${UPDATETIMEOUT} \
+                                     --proxy-user="${puid}" \
+                                     --proxy-password="${ppasswd}" \
+                                     $* || return 1
+}