Implement user creation for alpine-config

ref: https://gitlab.alpinelinux.org/alpine/cloud/tiny-cloud/-/issues/35

lib/tiny-cloud/user-data/alpine-config

@@ -4,7 +4,7 @@
 
 INIT_ACTIONS_MAIN="$(insert_before create_default_user userdata_user $INIT_ACTIONS_MAIN)"
 INIT_ACTIONS_MAIN="$(insert_after set_hostname \
-	"userdata_bootcmd userdata_groups userdata_write_files userdata_ntp userdata_apk_cache userdata_apk_repositories userdata_package_update userdata_package_upgrade userdata_packages" \
+	"userdata_bootcmd userdata_groups userdata_users userdata_write_files userdata_ntp userdata_apk_cache userdata_apk_repositories userdata_package_update userdata_package_upgrade userdata_packages" \
 	$INIT_ACTIONS_MAIN)"
 INIT_ACTIONS_MAIN="$(insert_after set_ssh_keys ssh_authorized_keys $INIT_ACTIONS_MAIN)"
 INIT_ACTIONS_FINAL="$INIT_ACTIONS_FINAL userdata_runcmd userdata_autoinstall"
@@ -248,6 +248,47 @@ init__userdata_groups() {
 	done
 }
 
+in_list() {
+	local i needle="$1"
+	shift
+	for i in "$@"; do
+		if [ "$i" = "$needle" ]; then
+			return 0
+		fi
+	done
+	return 1
+}
+
+init__userdata_users() {
+	local users="$(get_userdata users)"
+	local name gecos homedir shell
+	for i in $users; do
+		local keys="$(get_userdata users/$i)"
+		if [ "$i" = 1 ] && [ "$keys" = "default" ]; then
+			continue
+		fi
+		if in_list name $keys; then
+			name="$(get_userdata users/$i/name)"
+		else
+			continue
+		fi
+		if in_list gecos $keys; then
+			gecos="$(get_userdata users/$i/gecos)"
+		fi
+		if in_list homedir $keys; then
+			homedir="$(get_userdata users/$i/homedir)"
+		fi
+		if in_list shell $keys; then
+			shell="$(get_userdata users/$i/shell)"
+		fi
+		if getent passwd "$user" >/dev/null; then
+			log -i -t "$phase" info "$ACTION: user $user already exists"
+		else
+			$MOCK adduser -D ${gecos:+-g "$gecos"} ${homedir:+-h "$homedir"} ${shell:+-s "$shell"} "$name"
+		fi
+	done
+}
+
 find_biggest_empty_disk() {
 	local d
 	for d in  "$ROOT"/sys/class/block/*/device; do

tests/tiny-cloud-alpine.test

@@ -16,6 +16,12 @@ init_tests \
 	userdata_user_missing_name \
 	userdata_create_default_user \
 	userdata_no_default_user \
+	userdata_users_default_user \
+	userdata_users_default_name_only \
+	userdata_users_name_only \
+	userdata_users_gecos \
+	userdata_users_homedir \
+	userdata_users_shell \
 	userdata_ssh_authorized_keys \
 	userdata_groups \
 	userdata_bootcmd \
@@ -149,6 +155,95 @@ userdata_no_default_user_body() {
 		tiny-cloud main
 }
 
+userdata_users_default_user_body() {
+	fake_userdata_nocloud <<-EOF
+		#alpine-config
+		users:
+		  - default
+	EOF
+	atf_check -e ignore -o ignore tiny-cloud early
+	atf_check \
+		-e match:"create_default_user: done" \
+		-o match:"adduser.*alpine" \
+		tiny-cloud main
+}
+
+userdata_users_default_name_only_body() {
+	# first specified user will replace default user
+	fake_userdata_nocloud <<-EOF
+		#alpine-config
+		users:
+		  - name: foo
+	EOF
+	atf_check -e ignore -o ignore tiny-cloud early
+	atf_check \
+		-e match:"userdata_users: done" \
+		-o match:"adduser.*foo" \
+		tiny-cloud main
+}
+
+userdata_users_name_only_body() {
+	fake_userdata_nocloud <<-EOF
+		#alpine-config
+		users:
+		  - default
+		  - name: foo
+	EOF
+	atf_check -e ignore -o ignore tiny-cloud early
+	atf_check \
+		-e match:"userdata_users: done" \
+		-o match:"adduser.*foo" \
+		tiny-cloud main
+}
+
+userdata_users_gecos_body() {
+	# first specified user will replace default user
+	fake_userdata_nocloud <<-EOF
+		#alpine-config
+		users:
+		  - default
+		  - name: foo
+		    gecos: Joe User
+	EOF
+	atf_check -e ignore -o ignore tiny-cloud early
+	atf_check \
+		-e match:"userdata_users: done" \
+		-o match:"adduser.*-g Joe User.*foo" \
+		tiny-cloud main
+}
+
+userdata_users_homedir_body() {
+	# first specified user will replace default user
+	fake_userdata_nocloud <<-EOF
+		#alpine-config
+		users:
+		  - default
+		  - name: foo
+		    homedir: /foo
+	EOF
+	atf_check -e ignore -o ignore tiny-cloud early
+	atf_check \
+		-e match:"userdata_users: done" \
+		-o match:"adduser.*-h /foo.*foo" \
+		tiny-cloud main
+}
+
+userdata_users_shell_body() {
+	# first specified user will replace default user
+	fake_userdata_nocloud <<-EOF
+		#alpine-config
+		users:
+		  - default
+		  - name: foo
+		    shell: /bin/zsh
+	EOF
+	atf_check -e ignore -o ignore tiny-cloud early
+	atf_check \
+		-e match:"userdata_users: done" \
+		-o match:"adduser.*-s /bin/zsh.*foo" \
+		tiny-cloud main
+}
+
 userdata_ssh_authorized_keys_body() {
 	fake_bin getent <<-EOF
 		#!/bin/sh