macOS compatibility

[reneleonhardt]

The script / Makefile doesn't work on macOS.

For example mktemp tmp/options-XXXXXX.mk doesn't create the subfolder if it doesn't exist, and the pattern isn't templated if there is a suffix after XXXXXX.
In addition, mkimg.sh explicitly allows only NetBSD / smolBSD / Linux, not macOS (Darwin).

If you want to test it, you could add a CI workflow using the macos-latest runner.

diff --git a/docker2svc.sh b/docker2svc.sh
--- a/docker2svc.sh	(revision a6e722daba4d3fb4fb8274a63389584017236fe6)
+++ b/docker2svc.sh	(date 1770030292125)
@@ -12,7 +12,8 @@
 dockerfile=$1
 ECHON="/bin/echo -n"
 
-TMPOPTS=$(mktemp tmp/options-XXXXXX.mk)
+mkdir -p ./tmp
+TMPOPTS="$(mktemp tmp/options.mk.XXXXXX)"
 # Dockerfile compatibility
 sed -n 's/LABEL \(smolbsd\.\)\?\(.*=.*\)/\2/p' $dockerfile | \
 	awk -F= '{ printf "%s=%s\n", toupper($1), $2 }' \
diff --git a/mkimg.sh b/mkimg.sh
--- a/mkimg.sh	(revision a6e722daba4d3fb4fb8274a63389584017236fe6)
+++ b/mkimg.sh	(date 1770030545725)
@@ -89,16 +89,16 @@
 # those 2 will be ported at some point
 OpenBSD)
 	is_openbsd=1
-	echo "${ERROR} unsupported for now"
+	echo "${ERROR} $OS unsupported for now"
 	exit 1
 	;;
 FreeBSD)
 	is_freebsd=1
-	echo "${ERROR} unsupported for now"
+	echo "${ERROR} $OS unsupported for now"
 	exit 1
 	;;
 *)
-	echo "${ERROR} unsupported for now"
+	echo "${ERROR} $OS unsupported for now"
 	exit 1
 esac
 
diff --git a/README.md b/README.md
--- a/README.md	(revision a6e722daba4d3fb4fb8274a63389584017236fe6)
+++ b/README.md	(date 1770030049567)
@@ -49,6 +49,12 @@
 $ sudo apt install curl jq git bmake qemu-system-x86_64 sudo binutils libarchive-tools gdisk
 ```
 
+macOS:
+
+```sh
+$ brew install curl jq git bmake qemu binutils libarchive
+```
+
 ## Quickstart
 
 ### Create a _smolBSD_ image using a _Dockerfile_
@@ -74,11 +80,11 @@
 ```
 ⚙️ Build:
 ```sh
-host$ ./docker2svc.sh dockerfiles/Dockerfile.caddy
+SERVICE=caddy ./docker2svc.sh dockerfiles/Dockerfile.caddy
 ```
 🚀 Run:
 ```sh
-host$ ./startnb.sh -f etc/caddy.conf
+./startnb.sh -f etc/caddy.conf
 ```
 ✅ Test:
 ```sh

[iMilnb]

Hi and thanks for your PR!
Why specify the SERVICE with docker2svc.sh? it already takes care of exporting smolbsd.service=caddy:

# Dockerfile compatibility
sed -n 's/LABEL \(smolbsd\.\)\?\(.*=.*\)/\2/p' $dockerfile | \
        awk -F= '{ printf "%s=%s\n", toupper($1), $2 }' \
        >${TMPOPTS}

. ./${TMPOPTS}

Can you confirm this works for you and amend the commit?