Merge pull request #1232 from zyga/feature/rauc-transaction-id

Expose transaction ID to pre/post install handlers

docs/reference.rst

@@ -1060,6 +1060,11 @@ variables.
 ``RAUC_UPDATE_SOURCE``
   A deprecated alias for ``RAUC_BUNDLE_MOUNT_POINT``
 
+``RAUC_TRANSACTION_ID``
+  A UUID of a particular installation. This is either generated by RAUC or
+  provided explicitly on command line or over the D-Bus :ref:`InstallBundle
+  <gdbus-method-de-pengutronix-rauc-Installer.InstallBundle>` method.
+
 ``RAUC_MOUNT_PREFIX``
   Provides the path prefix that may be used for RAUC mount points
 

src/install.c

@@ -1353,6 +1353,7 @@ gboolean do_install_bundle(RaucInstallArgs *args, GError **error)
 	}
 
 	handler_env = prepare_environment(bundle->mount_point, bundle->manifest, target_group);
+	handler_env = g_environ_setenv(handler_env, "RAUC_TRANSACTION_ID", args->transaction, TRUE);
 
 	if (r_context()->config->preinstall_handler) {
 		g_message("Starting pre install handler: %s", r_context()->config->preinstall_handler);

test/bin/postinstall.sh

@@ -1,5 +1,6 @@
 #!/bin/sh
 
 [ "x$RAUC_CURRENT_BOOTNAME" != "xsystem0" ] && exit 1
+[ "x$RAUC_TRANSACTION_ID" = "x" ] && exit 1
 
 exit 0

test/bin/preinstall.sh

@@ -1,5 +1,6 @@
 #!/bin/sh
 
 [ "x$RAUC_CURRENT_BOOTNAME" != "xsystem0" ] && exit 1
+[ "x$RAUC_TRANSACTION_ID" = "x" ] && exit 1
 
 exit 0