test-upload-logs-swift: Add missing template for test

I forgot to "git add" this file in
Id91350ff1c531fd7266f3bf76681a8415941481f.

Change-Id: Ia6af42a7d9062fa7895f3b6901a0fa1e8646e8b9

roles/test-upload-logs-swift/templates/download-logs.sh.j2

@@ -0,0 +1,57 @@
+#!/bin/bash
+
+# Download all logs
+
+#
+# To use this file
+#
+#  curl "{{ base_url  }}/download-logs.sh" | bash
+#
+# Logs will be copied in a temporary directory as described in the
+# output.  Set DOWNLOAD_DIR to an empty directory if you wish to
+# override this.
+#
+
+BASE_URL={{ base_url }}
+
+function log {
+    echo "$(date -Iseconds) | $@"
+}
+
+function save_file {
+    local file="$1"
+
+    curl -s --compressed --create-dirs -o "${file}" "${BASE_URL}/${file}"
+
+    # Using --compressed we will send an Accept-Encoding: gzip header
+    # and the data will come to us across the network compressed.
+    # However, sometimes things like OpenStack's log server will send
+    # .gz files (as stored on its disk) uncompressed, so we check if
+    # this really looks like an ASCII file and rename for clarity.
+    if [[ "${file}" == *.gz ]]; then
+        local type=$(file "${file}")
+        if [[ "${type}" =~ "ASCII text" ]] || [[ "${type}" =~ "Unicode text" ]]; then
+            local new_name=${file%.gz}
+            log "Renaming to ${new_name}"
+            mv "${file}" "${new_name}"
+        fi
+    fi
+
+}
+
+if [[ -z "${DOWNLOAD_DIR}" ]]; then
+    DOWNLOAD_DIR=$(mktemp -d --tmpdir zuul-logs.XXXXXX)
+fi
+log "Saving logs to ${DOWNLOAD_DIR}"
+
+pushd "${DOWNLOAD_DIR}" > /dev/null
+
+{% set total_files = file_list | length %}
+{% for file in file_list %}
+log "Getting ${BASE_URL}/{{ '%-80s'|format(file) }} [ {{ '%04d'|format(loop.index) }} / {{ '%04d'|format(total_files) }} ]"
+save_file "{{ file }}"
+{% endfor %}
+
+popd >/dev/null
+
+log "Download complete!"