[PATCH v3 3/3] libxl: info: Display build_id of the hypervisor.

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

If the hypervisor is built with we will display it.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
v2: Include HAVE_*, use libxl_zalloc, s/rc/ret/
---
 tools/libxl/libxl.c         | 24 ++++++++++++++++++++++++
 tools/libxl/libxl.h         |  5 +++++
 tools/libxl/libxl_types.idl |  1 +
 tools/libxl/xl_cmdimpl.c    |  1 +
 4 files changed, 31 insertions(+)

diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index 9207621..b894c1f 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -5263,6 +5263,7 @@ libxl_numainfo *libxl_get_numainfo(libxl_ctx *ctx, int *nr)
 
 const libxl_version_info* libxl_get_version_info(libxl_ctx *ctx)
 {
+    GC_INIT(ctx);
     union {
         xen_extraversion_t xen_extra;
         xen_compile_info_t xen_cc;
@@ -5270,8 +5271,10 @@ const libxl_version_info* libxl_get_version_info(libxl_ctx *ctx)
         xen_capabilities_info_t xen_caps;
         xen_platform_parameters_t p_parms;
         xen_commandline_t xen_commandline;
+        xen_build_id_t build_id;
     } u;
     long xen_version;
+    int ret;
     libxl_version_info *info = &ctx->version_info;
 
     if (info->xen_version_extra != NULL)
@@ -5304,6 +5307,27 @@ const libxl_version_info* libxl_get_version_info(libxl_ctx *ctx)
     xc_version(ctx->xch, XENVER_commandline, &u.xen_commandline);
     info->commandline = strdup(u.xen_commandline);
 
+    u.build_id.len = sizeof(u) - sizeof(u.build_id);
+    ret = xc_version(ctx->xch, XENVER_build_id, &u.build_id);
+    switch ( ret ) {
+    case -EPERM:
+    case -ENODATA:
+    case 0:
+        info->build_id = strdup("");
+        break;
+    default:
+        if (ret > 0) {
+            unsigned int i;
+
+            info->build_id = libxl__zalloc(NOGC, (ret * 2) + 1);
+
+            for (i = 0; i < ret ; i++)
+                snprintf(&info->build_id[i * 2], 3, "%02hhx", u.build_id.buf[i]);
+        } else
+            LOGEV(ERROR, ret, "getting build_id");
+        break;
+    }
+    GC_FREE;
     return info;
 }
 
diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
index 05606a7..b91d906 100644
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -218,6 +218,11 @@
 #define LIBXL_HAVE_SOFT_RESET 1
 
 /*
+ * LIBXL_HAVE_BUILD_ID means that libxl_version_info has the extra
+ * field for the hypervisor build_id.
+ */
+#define LIBXL_HAVE_BUILD_ID 1
+/*
  * libxl ABI compatibility
  *
  * The only guarantee which libxl makes regarding ABI compatibility
diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
index 9658356..6c29885 100644
--- a/tools/libxl/libxl_types.idl
+++ b/tools/libxl/libxl_types.idl
@@ -355,6 +355,7 @@ libxl_version_info = Struct("version_info", [
     ("virt_start",        uint64),
     ("pagesize",          integer),
     ("commandline",       string),
+    ("build_id",          string),
     ], dir=DIR_OUT)
 
 libxl_domain_create_info = Struct("domain_create_info",[
diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index f9933cb..1fbe7f3 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -5549,6 +5549,7 @@ static void output_xeninfo(void)
     printf("cc_compile_by          : %s\n", info->compile_by);
     printf("cc_compile_domain      : %s\n", info->compile_domain);
     printf("cc_compile_date        : %s\n", info->compile_date);
+    printf("build_id               : %s\n", info->build_id);
 
     return;
 }
-- 
2.1.0