libxl: add option to choose who executes hotplug scripts

Add and option to xl.conf file to decide if hotplug scripts are
executed from the toolstack (xl) or from udev as it used to be in the
past.

This option is only introduced in this patch, but it has no effect
since the code to call hotplug scripts from libxl is introduced in a
latter patch.

This choice will be saved in "libxl/disable_udev", as specified in the
DISABLE_UDEV_PATH constant.

Signed-off-by: Roger Pau Monne <roger.pau@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Committed-by: Ian Campbell <ian.campbell@citrix.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/tools/libxl/libxl_internal.c b/tools/libxl/libxl_internal.c
index 24099f59f6..211c8f5e2f 100644
--- a/tools/libxl/libxl_internal.c
+++ b/tools/libxl/libxl_internal.c
@@ -352,6 +352,25 @@ int libxl__device_model_version_running(libxl__gc *gc, uint32_t domid)
     return value;
 }
 
+int libxl__hotplug_settings(libxl__gc *gc, xs_transaction_t t)
+{
+    int rc = 0;
+    char *val;
+
+    val = libxl__xs_read(gc, t, DISABLE_UDEV_PATH);
+    if (!val && errno != ENOENT) {
+        LOGE(ERROR, "cannot read %s from xenstore", DISABLE_UDEV_PATH);
+        rc = ERROR_FAIL;
+        goto out;
+    }
+    if (!val) val = "0";
+
+    rc = !!atoi(val);
+
+out:
+    return rc;
+}
+
 /*
  * Local variables:
  * mode: C