Support listing Debian package content via new script jdg-debc (Closes #119)

Can be used e.g. via:

  export POST_BUILD_HOOK=/usr/bin/jdg-debc

before the /usr/bin/build-and-provide-package step.

Thanks to Sipwise GmbH for sponsoring this script

debian/jenkins-debian-glue.install

@@ -3,6 +3,7 @@ debian/tmp/usr/bin/generate-git-snapshot usr/bin/
 debian/tmp/usr/bin/generate-reprepro-codename usr/bin/
 debian/tmp/usr/bin/generate-svn-snapshot usr/bin/
 debian/tmp/usr/bin/increase-version-number usr/bin/
+debian/tmp/usr/bin/jdg-debc usr/bin/
 debian/tmp/usr/bin/remove-reprepro-codename usr/bin/
 debian/tmp/usr/bin/repository_checker usr/bin/
 debian/tmp/usr/share/jenkins-debian-glue/examples/debian_glue etc/jenkins/

puppet/jenkins_debian_glue.pp

@@ -422,7 +422,8 @@ class jenkins::config {
       </selector>
     </hudson.plugins.copyartifact.CopyArtifact>
     <hudson.tasks.Shell>
-      <command>/usr/bin/build-and-provide-package</command>
+      <command>export POST_BUILD_HOOK=/usr/bin/jdg-debc
+/usr/bin/build-and-provide-package</command>
     </hudson.tasks.Shell>
     <hudson.tasks.Shell>
       <command>echo &quot;Listing packages inside the jenkins-debian-glue repository:&quot;

scripts/jdg-debc

@@ -0,0 +1,24 @@
+#!/bin/sh
+
+cat <<EOF
+  ┌──────────────────────────────────────────────────────────────────────────────┐
+  │  Displaying content of generated Debian packages.                            │
+  └──────────────────────────────────────────────────────────────────────────────┘
+EOF
+
+if ! which debc >/dev/null 2>&1 ; then
+  echo "Error: debc executable not available, please install the devscripts Debian package." >&2
+  exit 1
+fi
+
+CHANGES=$(find . -maxdepth 1 -name \*.changes ! -name \*_source.changes)
+
+if [ -n "$CHANGES" ] >/dev/null 2>&1 ; then
+  for file in $CHANGES ; do
+    debc "$file"
+  done
+elif ls ./*.deb >/dev/null 2>&1 ; then
+  debc ./*.deb
+else
+  echo "No changes and deb files found in $(pwd), ignoring."
+fi