build: Abstract release tarball generation to a utility script make_r…

…elease_tarball

Github-Pull: bitcoin#18818
Rebased-From: 0ea34e7 (partial: gitian only)

contrib/gitian-descriptors/gitian-linux.yml

@@ -148,7 +148,7 @@ script: |
 
   # Create the source tarball
   mkdir -p "$(dirname "$GIT_ARCHIVE")"
-  git archive --output="$GIT_ARCHIVE" HEAD
+  contrib/gitian-descriptors/make_release_tarball "${GIT_ARCHIVE}"
 
   ORIGPATH="$PATH"
   # Extract the git archive into a dir for each host and build

contrib/gitian-descriptors/gitian-osx.yml

@@ -111,7 +111,7 @@ script: |
 
   # Create the source tarball
   mkdir -p "$(dirname "$GIT_ARCHIVE")"
-  git archive --output="$GIT_ARCHIVE" HEAD
+  contrib/gitian-descriptors/make_release_tarball "${GIT_ARCHIVE}"
 
   ORIGPATH="$PATH"
   # Extract the git archive into a dir for each host and build

contrib/gitian-descriptors/gitian-win.yml

@@ -116,7 +116,7 @@ script: |
 
   # Create the source tarball
   mkdir -p "$(dirname "$GIT_ARCHIVE")"
-  git archive --output="$GIT_ARCHIVE" HEAD
+  contrib/gitian-descriptors/make_release_tarball "${GIT_ARCHIVE}"
 
   ORIGPATH="$PATH"
   # Extract the git archive into a dir for each host and build

contrib/gitian-descriptors/make_release_tarball

@@ -0,0 +1,10 @@
+#!/bin/sh
+# Copyright (c) 2020 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+#
+# A helper script to generate source release tarball
+
+GIT_ARCHIVE="$1"
+. "`dirname "$0"`/assign_DISTNAME"
+git archive --output="${GIT_ARCHIVE}" HEAD