use zstd if available

Author: SjorsO

client/scripts/send-to-watchtower.sh

@@ -8,11 +8,25 @@ if [[ -f "current-run.tar.gz" ]]; then
     rm current-run.tar.gz
 fi
 
-log_info "Creating \"current-run.tar.gz\""
+if [[ -f "current-run.tar.zst" ]]; then
+    rm current-run.tar.zst
+fi
+
+if command -v zstd >/dev/null 2>&1; then
+    log_info "Creating \"current-run.tar.zst\""
 
-tar --create --gzip --file="current-run.tar.gz" --directory="current-run" .
+    tar_file_name="current-run.tar.zst"
+
+    tar --use-compress-program "zstd -T0 -3" --create --file="$tar_file_name" --directory="current-run" .
+else
+    log_info "Creating \"current-run.tar.gz\""
+
+    tar_file_name="current-run.tar.gz"
+
+    tar --create --gzip --file="$tar_file_name" --directory="current-run" .
+fi
 
-log_info "\"current-run.tar.gz\" file size: $(du -h "current-run.tar.gz" | cut -f1)"
+log_info "\"$tar_file_name\" file size: $(du -h "$tar_file_name" | cut -f1)"
 
 if [[ ! -f "data/watchtower-url" ]]; then
     log_error "Missing data/watchtower-url" && exit 1
@@ -41,7 +55,7 @@ curl_response=$(curl --fail --silent --show-error \
     --header "Authorization: Bearer ${api_token}" \
     --header "Accept: application/json" \
     --form "server_uuid=${server_uuid}" \
-    --form "bundle=@current-run.tar.gz" \
+    --form "bundle=@$tar_file_name" \
     "$endpoint" 2>&1) || curl_exit_code=$?
 
 if [[ ${curl_exit_code:-0} -ne 0 ]] || [[ ! "$curl_response" =~ ^Acknowledged! ]]; then