From aa3227fbfb1f703dad433b28023067ece8ee21f0 Mon Sep 17 00:00:00 2001
From: Etienne Perot <etienne@perot.me>
Date: Sun, 8 Oct 2023 16:16:07 -0700
Subject: [PATCH] build-image.sh: Support building the image on Docker.

---
 install/linux/build-image.sh | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/install/linux/build-image.sh b/install/linux/build-image.sh
index 8470ebb..c0fe160 100755
--- a/install/linux/build-image.sh
+++ b/install/linux/build-image.sh
@@ -1,14 +1,25 @@
 #!/bin/sh
 
-set -e
+set -euo pipefail
 
 TAG=dangerzone.rocks/dangerzone:latest
 
-echo "Building container image"
-podman build --pull dangerzone/ -f Dockerfile --tag $TAG
+container_runtime() {
+	if hash podman &>/dev/null; then
+		podman "$@"
+	elif hash docker &>/dev/null; then
+		docker "$@"
+	else
+		echo 'No container runtime installed.' >&2
+		exit 1
+	fi
+}
 
-echo "Saving and compressing container image"
-podman save $TAG | gzip > share/container.tar.gz
+echo "Building container image" >&2
+container_runtime build --pull dangerzone/ -f Dockerfile --tag "$TAG"
 
-echo "Looking up the image id"
-podman images -q --filter=reference=$TAG > share/image-id.txt
+echo "Saving and compressing container image" >&2
+container_runtime save "$TAG" | gzip > share/container.tar.gz
+
+echo "Looking up the image id" >&2
+container_runtime images -q --filter=reference="$TAG" > share/image-id.txt