[PATCH libvirt] xen: handle root= in xen-xm configuration files.

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In addition to extra= xm supported a root= option which was supposed
to be incorporated into the final command line. Handle that for "virsh
domxml-from-native xen-xm". Tested with the libxl backend.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 .gnulib            |    2 +-
 src/xenxs/xen_xm.c |   14 +++++++++++++-
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/.gnulib b/.gnulib
index d55899f..e8e0eb6 160000
--- a/.gnulib
+++ b/.gnulib
@@ -1 +1 @@
-Subproject commit d55899fd2c5794ac85ecb14d5e2f646a89e4b4dd
+Subproject commit e8e0eb6bfb728685ec8d5afd924e41b18e9d928d
diff --git a/src/xenxs/xen_xm.c b/src/xenxs/xen_xm.c
index b2db97d..2cd6d4c 100644
--- a/src/xenxs/xen_xm.c
+++ b/src/xenxs/xen_xm.c
@@ -339,6 +339,8 @@ xenParseXM(virConfPtr conf, int xendConfigVersion,
             def->os.nBootDevs++;
         }
     } else {
+        const char *extra, *root;
+
         if (xenXMConfigCopyStringOpt(conf, "bootloader", &def->os.bootloader) < 0)
             goto cleanup;
         if (xenXMConfigCopyStringOpt(conf, "bootargs", &def->os.bootloaderArgs) < 0)
@@ -348,8 +350,18 @@ xenParseXM(virConfPtr conf, int xendConfigVersion,
             goto cleanup;
         if (xenXMConfigCopyStringOpt(conf, "ramdisk", &def->os.initrd) < 0)
             goto cleanup;
-        if (xenXMConfigCopyStringOpt(conf, "extra", &def->os.cmdline) < 0)
+        if (xenXMConfigGetString(conf, "extra", &extra, NULL) < 0)
+            goto cleanup;
+        if (xenXMConfigGetString(conf, "root", &root, NULL) < 0)
             goto cleanup;
+
+        if (root) {
+            if (virAsprintf(&def->os.cmdline, "root=%s %s", root, extra) < 0)
+                goto cleanup;
+        } else {
+            if (VIR_STRDUP(def->os.cmdline, extra) < 0)
+                goto cleanup;
+        }
     }
 
     if (xenXMConfigGetULongLong(conf, "memory", &def->mem.cur_balloon,
-- 
1.7.10.4

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