From 779de00952b8cf03a3a34efe9c5ca0f287576546 Mon Sep 17 00:00:00 2001
From: merakor <cem@ckyln.com>
Date: Tue, 10 Aug 2021 23:12:37 +0000
Subject: fix CPT_COMPRESS if faulty variable is set

FossilOrigin-Name: cea141d938e78239f6ec5c90457d40311797a712f87d0a001839b2e9b8b4e142
---
 src/cpt-lib.in | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/cpt-lib.in b/src/cpt-lib.in
index a882594..abf5bdf 100644
--- a/src/cpt-lib.in
+++ b/src/cpt-lib.in
@@ -2233,8 +2233,13 @@ create_cache() {
     # do nothing on a normal system.
     mkdir -p "$CPT_ROOT/" 2>/dev/null ||:
 
-    # Set a value for CPT_COMPRESS if it isn't set.
-    : "${CPT_COMPRESS:=gz}"
+    # Set the default compression to gzip, and warn the user if the value is
+    # invalid.
+    case ${CPT_COMPRESS:=gz} in
+        bz2|gz|xz|zst|lz) ;;
+        *) warn "'$CPT_COMPRESS' is not a valid CPT_COMPRESS value, falling back to 'gz'"
+           CPT_COMPRESS=gz
+    esac
 
     # Set colors if they are to be enabled.
     # shellcheck disable=2034
-- 
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