Add incus support

Incus provides meta-data via unix socket /dev/incus/sock
https://linuxcontainers.org/incus/docs/main/dev-incus/

lib/tiny-cloud/cloud/incus/imds

@@ -0,0 +1,21 @@
+# Incus Instance Metadata
+# vim:set filetype=sh:
+# shellcheck shell=sh
+
+# https://linuxcontainers.org/incus/docs/main/dev-incus/
+
+IMDS_URI=/1.0/meta-data
+IMDS_LOCAL_HOSTNAME="local-hostname"
+IMDS_HOSTNAME="local-hostname"
+IMDS_ENDPOINT=local:/dev/incus/sock
+
+_imds() {
+	printf "GET %s HTTP/1.0\n\n" "$IMDS_URI" \
+		| nc "$IMDS_ENDPOINT" | dos2unix \
+		| awk -F ': ' -v key="$1" '$1 == key { print $2 }'
+}
+
+_imds_userdata() {
+	printf "GET /1.0/config/user.user-data HTTP/1.0\n\n" \
+		| nc "$IMDS_ENDPOINT" | sed '1,/^\r$/d'
+}

tests/bin/nc

@@ -20,14 +20,24 @@ while [ ! -z "$1" ]; do
 	esac
 done
 
-# Scaleway
-if [ "$CLOUD" = "scaleway" ]; then
-	if [ $local_port -gt 1023 ]; then
-		NC_CONTENT="invalid local port"
-	else
-		NC_CONTENT="$(cat ${NC_FILE:-$host.txt})"
-	fi
-	printf "HTTP/1.1 200 OK\r\n\r\n%s" "$NC_CONTENT"
-else
-	echo "token-foo"
-fi
+case "$CLOUD" in
+	scaleway)
+		if [ $local_port -gt 1023 ]; then
+			NC_CONTENT="invalid local port"
+		else
+			NC_CONTENT="$(cat ${NC_FILE:-$host.txt})"
+		fi
+		printf "HTTP/1.1 200 OK\r\n\r\n%s" "$NC_CONTENT"
+		;;
+	incus)
+		set -- $input  # GET $URL HTTP/1.0
+		url="$2"
+		NC_CONTENT="$(cat ${NC_FILE:-${host%:*}.txt})"
+		len=$(printf "%s" "$NC_CONTENT" | wc -c)
+		printf "HTTP/1.0 200 $url OK\r\nContent-Type: application/json\r\nContent-Length: $len\r\n\r\n%s" \
+			"$NC_CONTENT"
+		;;
+	*)
+		echo "token-foo"
+		;;
+esac

tests/imds.test

@@ -18,6 +18,7 @@ init_tests \
 	imds_hostname_oci \
 	imds_hostname_scaleway \
 	imds_hostname_hetzner \
+	imds_hostname_incus \
 	\
 	imds_local_hostname_aws \
 	imds_local_hostname_azure \
@@ -26,6 +27,7 @@ init_tests \
 	imds_local_hostname_oci \
 	imds_local_hostname_scaleway \
 	imds_local_hostname_hetzner \
+	imds_local_hostname_incus \
 	\
 	imds_ssh_keys_aws \
 	imds_ssh_keys_azure \
@@ -38,6 +40,7 @@ init_tests \
 	imds_nocloud_cmdline_local_hostname \
 	imds_nocloud_smbios_local_hostname \
 	\
+	imds_userdata_incus \
 	imds_userdata_scaleway
 
 imds_help_body() {
@@ -68,6 +71,13 @@ check_hostname() {
 imds_hostname_aws_body()	{ check_hostname aws; }
 imds_hostname_azure_body()	{ check_hostname azure; }
 imds_hostname_gcp_body()	{ check_hostname gcp; }
+imds_hostname_incus_body()	{
+	fake_metadata incus <<-EOF
+		#cloud-config
+		local-hostname: myhostname
+	EOF
+	CLOUD="incus" atf_check -o match:"myhostname" imds @hostname
+}
 imds_hostname_nocloud_body()	{ check_hostname nocloud; }
 imds_hostname_oci_body()	{ check_hostname oci; }
 imds_hostname_scaleway_body()	{
@@ -80,7 +90,7 @@ imds_hostname_hetzner_body()	{ check_hostname hetzner; }
 
 check_local_hostname() {
 	fake_metadata "$1" <<-EOF
-		# nocloud, alpine, aws
+		# nocloud, alpine, aws, incus
 		local-hostname: myhostname
 		# hetzner
 		hostname: myhostname
@@ -96,6 +106,7 @@ check_local_hostname() {
 imds_local_hostname_aws_body()		{ check_local_hostname aws; }
 imds_local_hostname_azure_body()	{ check_local_hostname azure; }
 imds_local_hostname_gcp_body()		{ check_local_hostname gcp; }
+imds_local_hostname_incus_body()	{ check_local_hostname incus; }
 imds_local_hostname_nocloud_body()	{ check_local_hostname nocloud; }
 imds_local_hostname_oci_body()	{ check_local_hostname oci; }
 imds_local_hostname_scaleway_body()	{
@@ -106,6 +117,7 @@ EOF
 	CLOUD="scaleway" atf_check -o match:"^myhostname$" imds @local-hostname
 }
 imds_local_hostname_hetzner_body()	{ check_local_hostname hetzner; }
+imds_local_hostname_incus_body()	{ check_local_hostname incus; }
 
 check_ssh_keys() {
 	local key="ssh-ed25519 keydata"
@@ -181,6 +193,13 @@ imds_nocloud_smbios_local_hostname_body() {
 	done
 }
 
+imds_userdata_incus_body() {
+	fake_userdata_incus <<-EOF
+		#alpine-config
+	EOF
+	CLOUD="incus" atf_check -o match:"#alpine-config" imds @userdata
+}
+
 imds_userdata_scaleway_body() {
 	local cmd="sh ./cmd"
 	fake_userdata_scaleway <<-EOF

tests/test_env.sh

@@ -98,15 +98,24 @@ fake_metadata_hetzner() {
 	export WGET_STRIP_PREFIX="/hetzner/v1/metadata"
 }
 
+fake_metadata_incus() {
+	cat > "local.txt"
+}
+
+fake_userdata_incus() {
+	cat > "local.txt"
+}
+
 fake_metadata() {
 	case "${1:-$CLOUD}" in
 		alpine|nocloud) fake_metadata_nocloud;;
 		aws) fake_metadata_aws;;
 		azure) fake_metadata_azure;;
 		gcp) fake_metadata_gcp;;
+		hetzner) fake_metadata_hetzner;;
+		incus) fake_metadata_incus;;
 		oci) fake_metadata_oci;;
 		scaleway) fake_metadata_scaleway;;
-		hetzner) fake_metadata_hetzner;;
 		*) echo "TODO: fake_metadata_$CLOUD" >&2;;
 	esac
 }