MT#8603 Use repos' Packages file for identifying ngcp-installer version

As noticed by Victor the trunk installations using the
development.sh script retrieved the latest version of the
installer, no matter to which repository this binary belonged to
(so even if it's not listed in release-trunk-${debian_release}).
This causes problems when you are using trunk installations and
someone is working on installer on branches, reviewing changes,
etc.

To avoid this problem we take a look at the Packages file of the
according repository instead. This isn't limited only to trunk
builds, but also for the release builds, to avoid any possible
problems with multiple deb files inside the pool directory (which
isn't the case yet, but we *could* do that now).

Change-Id: Ie215e70e9317133750cdf0e4b264a3b2c6f083fa

deployment.sh

@@ -1260,41 +1260,33 @@ get_installer_path() {
 
   # use pool directory according for ngcp release
   if $PRO_EDITION ; then
+    if [ -n "$CROLE" ]; then
+      local installer_package='ngcp-installer-carrier'
+    else
+      local installer_package='ngcp-installer-pro'
+    fi
+    local repos_base_path="http://deb.sipwise.com/sppro/${SP_VERSION}/dists/${DEBIAN_RELEASE}/main/binary-amd64/"
     INSTALLER_PATH="http://deb.sipwise.com/sppro/${SP_VERSION}/pool/main/n/ngcp-installer/"
   else
+    local installer_package='ngcp-installer-ce'
+    local repos_base_path="http://deb.sipwise.com/spce/${SP_VERSION}/dists/${DEBIAN_RELEASE}/main/binary-amd64/"
     INSTALLER_PATH="http://deb.sipwise.com/spce/${SP_VERSION}/pool/main/n/ngcp-installer/"
   fi
 
   # use a separate repos for trunk releases
   if $TRUNK_VERSION ; then
-    INSTALLER_PATH='http://deb.sipwise.com/autobuild/pool/main/n/ngcp-installer/'
-  fi
-
-  wget --directory-prefix=debs --no-directories -r --no-parent "$INSTALLER_PATH"
-
-  # Get rid of unused ngcp-installer-pro-ha-v3 packages to avoid version number problems
-  rm -f debs/ngcp-installer-pro-ha-v3*
-
-  # As soon as a *tagged* version against $DEBIAN_RELEASE enters the pool
-  # (e.g. during release time) the according package which includes the
-  # $DEBIAN_RELEASE string disappears, in such a situation instead choose the
-  # highest version number instead.
-  local count_distri_package="$(find ./debs -type f -a -name \*\+${DEBIAN_RELEASE}\*.deb)"
-  if [ -z "$count_distri_package" ] ; then
-    echo  "Could not find any $DEBIAN_RELEASE specific packages, going for highest version number instead."
-    logit "Could not find any $DEBIAN_RELEASE specific packages, going for highest version number instead."
-  else
-    echo  "Found $DEBIAN_RELEASE specific packages, getting rid of all packages without gbp and $DEBIAN_RELEASE in their name."
-    logit "Found $DEBIAN_RELEASE specific packages, getting rid of all packages without gbp and $DEBIAN_RELEASE in their name."
-    # get rid of files not matching the Debian relase we want to install
-    find ./debs -type f -a ! -name \*\+${DEBIAN_RELEASE}\* -exec rm {} +
+    local repos_base_path="http://deb.sipwise.com/autobuild/dists/release-trunk-${DEBIAN_RELEASE}/main/binary-amd64/"
+    INSTALLER_PATH="http://deb.sipwise.com/autobuild/pool/main/n/ngcp-installer/"
   fi
 
-  local version=$(dpkg-scanpackages debs /dev/null 2>/dev/null | awk '/Version/ {print $2}' | sort -ur)
+  wget --timeout=30 -O Packages "${repos_base_path}/Packages"
+  # sed: display paragraphs matching the "Package: ..." string, then grab string "^Version: " and display the actual version via awk
+  # sort -u to avoid duplicates in repositories shipping the ngcp-installer-pro AND ngcp-installer-pro-ha-v3 debs
+  local version=$(sed "/./{H;\$!d;};x;/Package: ${installer_package}/b;d" Packages | awk '/^Version: / {print $2}' | sort -u)
 
-  [ -n "$version" ] || die "Error: installer version could not be detected."
+  [ -n "$version" ] || die "Error: installer version for ngcp ${SP_VERSION}, Debian release $DEBIAN_RELEASE with installer package $installer_package could not be detected."
 
-  if $PRO_EDITION ; then
+  if "$PRO_EDITION" ; then
     if [ -n "$CROLE" ]; then
       INSTALLER="ngcp-installer-carrier_${version}_all.deb"
     else