Fixes changelog creation starting on a pkg tag

hooks/prebuild/eole/create-changelog

@@ -12,7 +12,7 @@ pkg_tags="$(git for-each-ref --format '%(refname)' refs/tags | tac)"
 
 # Set starting commit
 ceiling_commit=$(git describe --match "build/*" --abbrev=0 2>/dev/null)
-if [ -z "ceiling_commit" ]
+if [ -z "$ceiling_commit" ]
 then
   ceiling_commit="HEAD"
 fi
@@ -220,14 +220,13 @@ function next_version {
 function gen_changelog_entry {
   ceiling_commit=$1
   floor_commit="$(next_step "${ceiling_commit}")"
-
   if [ "$(get_hash ${ceiling_commit})" = "$(get_hash ${floor_commit})" ]
   then
     return 1
   fi
-
   if on_pkg_tag $ceiling_commit
   then
+    ceiling_commit="$(get_previous_pkg_tag $ceiling_commit)"
     version="$(get_upstream_version_from_tag $ceiling_commit)-$(get_package_version_from_tag $ceiling_commit)"
     distribution="$(get_distribution_from_tag $ceiling_commit)"
   else
@@ -235,13 +234,11 @@ function gen_changelog_entry {
     version=$(next_version $ceiling_commit)
     distribution="UNRELEASED"
   fi
-
   #current_release="$(git describe --abbrev=0 --always --match='release/*' $ceiling_commit)"
   tamarin_info "Création de l’entrée de changelog entre ${ceiling_commit} et ${floor_commit}"
 
   maintainer="$(packager_from_commit ${ceiling_commit})"
   package_date="$(date_from_commit ${ceiling_commit})"
-
   version=${version/_/-}
   changelog_entry="${project_name} (${version}) ${distribution}; urgency=${urgency}"
   echo "$changelog_entry" >> debian/changelog