From 1cd7a48a474afce969208376c3dbb329c3e5ba61 Mon Sep 17 00:00:00 2001
From: Christoph Anton Mitterer <mail@christoph.anton.mitterer.name>
Date: Tue, 15 Nov 2022 22:30:09 +0100
Subject: [PATCH] btrbk: allow compressors to not have a compression level

This commit assumes that a negative `level_min`-value, which would never really
make sense as it would result in an option `--#`, means that the compression
tool does not support any level options at all.

A negative `level_max`-value would in principle still allow to have no upper
limmit, and is therefore not checked for.

Signed-off-by: Christoph Anton Mitterer <mail@christoph.anton.mitterer.name>
---
 btrbk | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/btrbk b/btrbk
index e0bffd1..bc9f708 100755
--- a/btrbk
+++ b/btrbk
@@ -727,7 +727,9 @@ sub compress_cmd_text($;$)
       WARN_ONCE "Compression level capped to maximum for '$cc->{name}': $cc->{level_max}";
       $level = $cc->{level_max};
     }
-    push @cmd, '-' . $level;
+    if($cc->{level_min} >= 0) {
+      push @cmd, '-' . $level;
+    }
   }
   if(defined($def->{threads}) && ($def->{threads} ne "default")) {
     my $thread_opt = $cc->{threads};