mbuto: fix regression when output path is not specified

Commit 12e3933 ("Remove unnecessary cpio_init function") removed the
cpio_init() function since it was called only with the discard option.
However, in doing so, it introduced a regression bug, causing mbuto to
crash at line 1066 with the error "No such file or directory" if the
initramfs output path is not specified. The error happens because
cpio_init() was responsible for creating a temporary file if the output
path was not specified. This patch restores the code to create a temporary
image if the output path is not specified and adds it to the build()
function.

Fixes: 12e3933f762c ("Remove unnecessary cpio_init function")
Signed-off-by: Marco Pagani <marpagan@redhat.com>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/mbuto b/mbuto
index 247b63d..d138b8d 100755
--- a/mbuto
+++ b/mbuto
@@ -965,6 +965,11 @@ pkg_add() {
 
 # build() - Build a new image, sourcing contents
 build() {
+	if [ -z "${OUT}" ]; then
+		OUT="$("${MKTEMP}")"
+		notice "Creating image: ${OUT}"
+	fi
+
 	kmod_init
 
 	for __d in ${DIRS}; do