scripts: Add archive-source.sh

Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

scripts/archive-source.sh

+#!/bin/bash
+#
+# Author: Fam Zheng <famz@redhat.com>
+#
+# Archive source tree, including submodules. This is created for test code to
+# export the source files, in order to be built in a different environment,
+# such as in a docker instance or VM.
+#
+# This code is licensed under the GPL version 2 or later.  See
+# the COPYING file in the top-level directory.
+
+error() {
+    printf %s\\n "$*" >&2
+    exit 1
+}
+
+if test $# -lt 1; then
+    error "Usage: $0 <output tarball>"
+fi
+
+tar_file="$1"
+list_file="$1.list"
+submodules=$(git submodule foreach --recursive --quiet 'echo $name')
+
+if test $? -ne 0; then
+    error "git submodule command failed"
+fi
+
+trap "status=$?; rm -f \"$list_file\"; exit \$status" 0 1 2 3 15
+
+if test -n "$submodules"; then
+    {
+        git ls-files || error "git ls-files failed"
+        for sm in $submodules; do
+            (cd $sm; git ls-files) | sed "s:^:$sm/:"
+            if test "${PIPESTATUS[*]}" != "0 0"; then
+                error "git ls-files in submodule $sm failed"
+            fi
+        done
+    } | grep -x -v $(for sm in $submodules; do echo "-e $sm"; done) > "$list_file"
+else
+    git ls-files > "$list_file"
+fi
+
+if test $? -ne 0; then
+    error "failed to generate list file"
+fi
+
+tar -cf "$tar_file" -T "$list_file" || error "failed to create tar file"
+
+exit 0