libxl: postpone backend name resolution

This adds a backend_domname field in libxl devices that contain a
backend_domid field, allowing either a domid or a domain name to be
specified in the configuration structures.  The domain name is resolved
into a domain ID in the _setdefault function when adding the device.
This change allows the backend of the block devices to be specified
(which previously required passing the libxl_ctx down into the block
device parser), and will simplify specification of backend domains in
other users of libxl.

The check on run_hotplug_scripts in parse_config_data is removed because
it is a duplicate of the one in libxl__device_nic_setdefault, and is
removed here because it no longer has the resolved domain ID to check.

Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
[ ijc -- reran flex ]

1 files changed, 1 insertions, 0 deletions

diff --git a/tools/libxl/libxlu_disk_l.l b/tools/libxl/libxlu_disk_l.l
index bee16a10d0..7c4e7f1b65 100644
--- a/tools/libxl/libxlu_disk_l.l
+++ b/tools/libxl/libxlu_disk_l.l
@@ -168,6 +168,7 @@ devtype=disk,?	{ DPC->disk->is_cdrom = 0; }
 devtype=[^,]*,?	{ xlu__disk_err(DPC,yytext,"unknown value for type"); }
 
 access=[^,]*,?	{ STRIP(','); setaccess(DPC, FROMEQUALS); }
+backend=[^,]*,? { STRIP(','); SAVESTRING("backend", backend_domname, FROMEQUALS); }
 backendtype=[^,]*,? { STRIP(','); setbackendtype(DPC,FROMEQUALS); }
 
 vdev=[^,]*,?	{ STRIP(','); SAVESTRING("vdev", vdev, FROMEQUALS); }