From 43ae09aee53cb049da3dc9b7b87a380b19a1925e Mon Sep 17 00:00:00 2001
From: Kamil Dudka <kdudka@redhat.com>
Date: Tue, 30 Apr 2024 14:20:33 +0200
Subject: [PATCH] make-srpm.sh: use the pxz compressor if available

... to speed up creation of .tar.xz on a multicore machine.  After the
recent extension of the test-suite, compression of the distribution
tarball started to take too much time.  This change makes it reasonably
fast again in my development environment.

Closes: https://github.com/csutils/csdiff/pull/175
---
 make-srpm.sh | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/make-srpm.sh b/make-srpm.sh
index 3fb3b3c5..90da96db 100755
--- a/make-srpm.sh
+++ b/make-srpm.sh
@@ -68,7 +68,13 @@ if [[ "$1" != "--generate-spec" ]]; then
     git archive --prefix="$NV/" --format="tar" HEAD -- . > "$SRC_TAR" \
                                             || die "failed to export sources"
 
-    xz -c "$SRC_TAR" > "$SRC"               || die "failed to compress sources"
+    # use pxz (threaded xz) if available to speed up the compression
+    if pxz --version | grep '^Parallel PXZ' > /dev/null; then
+        XZ=pxz
+    else
+        XZ=xz
+    fi
+    $XZ -c "$SRC_TAR" > "$SRC" || die "failed to compress sources with ${XZ}"
 fi
 
 SPEC="./$PKG.spec"