generate-git-snapshot: Allow skipping of git-dch

In some cases it may be desirable to build a branch as-is,
without modifying the debian changelog. This patch allows this
by adding an option SKIP_DCH, which will skip running if set
to "1".

scripts/generate-git-snapshot

@@ -165,29 +165,32 @@ else
   git checkout -b "$random_branch" "$GIT_COMMIT"
 fi
 
-if [ -n "${tag:-}" ] ; then
-  echo "Tag parameter found, not touching the changelog."
-elif [ "${1:-}" = "identify" ] ; then
-  echo "Trying to identify latest tag / merge..."
-
-  if ! git describe $(git rev-list --tags='[^u]*' --max-count=1 HEAD) >/dev/null ; then
-    echo "Failed to identify latest change, falling back to auto mode."
-    git_dch_auto
-  else
-    identify_latest_change
-  fi
-elif [ -r debian/gbp.conf ] ; then
-  echo "Found debian/gbp.conf, using git-dch with auto mode."
-  git_dch_auto
-else
-  echo "Using git-dch with auto mode."
-  git_dch_auto
-fi
+# Allow skipping of changelog creation, e.g. to build a branch as-is
+if [ "$SKIP_DCH" != "1" ]; then
+    if [ -n "${tag:-}" ] ; then
+      echo "Tag parameter found, not touching the changelog."
+    elif [ "${1:-}" = "identify" ] ; then
+      echo "Trying to identify latest tag / merge..."
+
+      if ! git describe $(git rev-list --tags='[^u]*' --max-count=1 HEAD) >/dev/null ; then
+        echo "Failed to identify latest change, falling back to auto mode."
+        git_dch_auto
+      else
+        identify_latest_change
+      fi
+    elif [ -r debian/gbp.conf ] ; then
+      echo "Found debian/gbp.conf, using git-dch with auto mode."
+      git_dch_auto
+    else
+      echo "Using git-dch with auto mode."
+      git_dch_auto
+    fi
 
-# get rid of "UNRELEASED" distribution header, only
-# necessary if the debian/changelog was modified
-if [ -z "${tag:-}" ] ; then
-  debchange --release ""
+    # get rid of "UNRELEASED" distribution header, only
+    # necessary if the debian/changelog was modified
+    if [ -z "${tag:-}" ] ; then
+      debchange --release ""
+    fi
 fi
 
 # prepare orig.tar.gz using pristine-tar, but without actually building the source package