[Xen-devel] [PATCH 12 of 29 RFC] libxl: add hotplug script calling for NetBSD

[Roger Pau Monne <roger.pau@xxxxxxxxxxxxx>]

# HG changeset patch
# User Roger Pau Monne <roger.pau@xxxxxxxxxxxxx>
# Date 1328177424 -3600
# Node ID 6c2690921fba580dd7dd836da3be484dee049be0
# Parent  5e488e0c02b8c769e94c2f734c0c209739d9cb01
libxl: add hotplug script calling for NetBSD

Hotplug scripts in NetBSD are in charge of adding the virtual DomU
network interface to the desired bridge and also mount the vnd device
to use virtual images as block devices. The following scripts are
currently implemented:

 * block: executed when a vbd is used, is in charge mounting the
   virtual image to the vnd device and setting the state of xenstore
   to 4 (connected). When using a physical partition, the script only
   sets the state to 4.

 * vif-bridge: adds the virtual DomU interface to the desired bridge.

 * vif-ip: configures the physical network interface assigned to the
   DomU.

Signed-off-by: Roger Pau Monne <roger.pau@xxxxxxxxxxxxx>

diff -r 5e488e0c02b8 -r 6c2690921fba tools/libxl/libxl_netbsd.c
--- a/tools/libxl/libxl_netbsd.c        Fri Sep 30 14:38:55 2011 +0200
+++ b/tools/libxl/libxl_netbsd.c        Thu Feb 02 11:10:24 2012 +0100
@@ -30,5 +30,50 @@ int libxl__try_phy_backend(mode_t st_mod
 int libxl__device_hotplug(libxl__gc *gc, libxl__device *dev,
                           libxl__hotplug_action action)
 {
-    return 0;
+    libxl_ctx *ctx = libxl__gc_owner(gc);
+    char *be_path = libxl__device_backend_path(gc, dev);
+    char *script, *what;
+    char **args;
+    int status, nr = 0;
+    int rc = -1;
+    flexarray_t *f_args;
+
+    if (dev->backend_kind != LIBXL__DEVICE_KIND_VIF &&
+        dev->backend_kind != LIBXL__DEVICE_KIND_VBD)
+        return 0;
+
+    script = libxl__xs_read(gc, XBT_NULL,
+                            libxl__sprintf(gc, "%s/%s", be_path, "script"));
+    if (!script) {
+        LIBXL__LOG(ctx, LIBXL__LOG_ERROR, "Unable to read script from %s",
+                                          be_path);
+        return -1;
+    }
+
+    f_args = flexarray_make(4, 1);
+    if (!f_args)
+        return -1;
+
+    flexarray_set(f_args, nr++, script);
+    flexarray_set(f_args, nr++, be_path);
+    flexarray_set(f_args, nr++, libxl__sprintf(gc, "%d", action));
+    flexarray_set(f_args, nr++, NULL);
+
+    args = (char **) flexarray_contents(f_args);
+
+    what = libxl__sprintf(gc, "%s %s", args[0],
+                          action == CONNECT ? "connect" : "disconnect");
+    LIBXL__LOG(ctx, LIBXL__LOG_DEBUG,
+               "Calling hotplug script: %s %s %s",
+               args[0], args[1], args[2]);
+    status = libxl__forkexec(gc, -1, -1, -1, args[0], args, NULL, what);
+    if (status) {
+        rc = -1;
+        goto out;
+    }
+    rc = 0;
+
+out:
+    free(args);
+    return rc;
 }

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