[PATCH v9 23/27] 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>
Acked-by: Wei Liu <wei.liu2@citrix.com>

---
CC: Ian Jackson <ian.jackson@eu.citrix.com>
CC: Wei Liu <wei.liu2@citrix.com>

v2: Include HAVE_*, use libxl_zalloc, s/rc/ret/
v3: Retry with different size if 1020 is not enough.
v4: Use VERSION_OP subops instead of the XENVER_ subops
v5: Change it per Wei's review. s/VERSION_OP/VERSION/
    And actually use the proper Style!
v8: VERSION_OP was reverted, resurrect v3 version.
v9: Made the if (r) LOGEV adhere to StyleGuide
---
 tools/libxl/libxl.c         | 44 ++++++++++++++++++++++++++++++++++++++++++++
 tools/libxl/libxl.h         |  6 ++++++
 tools/libxl/libxl_types.idl |  1 +
 tools/libxl/xl_cmdimpl.c    |  1 +
 4 files changed, 52 insertions(+)

diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index eec899d..c39d745 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -5353,6 +5353,38 @@ libxl_numainfo *libxl_get_numainfo(libxl_ctx *ctx, int *nr)
     return ret;
 }
 
+static const int libxl__xc_version_wrap(libxl__gc *gc, libxl_version_info *info,
+                                        xen_build_id_t *build)
+{
+    int r;
+
+    r = xc_version(CTX->xch, XENVER_build_id, build);
+    switch (r) {
+    case -EPERM:
+    case -ENODATA:
+    case 0:
+        info->build_id = libxl__strdup(NOGC, "");
+        break;
+
+    case -ENOBUFS:
+        break;
+
+    default:
+        if (r > 0) {
+            unsigned int i;
+
+            info->build_id = libxl__zalloc(NOGC, (r * 2) + 1);
+
+            for (i = 0; i < r ; i++)
+                snprintf(&info->build_id[i * 2], 3, "%02hhx", build->buf[i]);
+
+            r = 0;
+        }
+        break;
+    }
+    return r;
+}
+
 const libxl_version_info* libxl_get_version_info(libxl_ctx *ctx)
 {
     GC_INIT(ctx);
@@ -5363,8 +5395,10 @@ 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 r;
     libxl_version_info *info = &ctx->version_info;
 
     if (info->xen_version_extra != NULL)
@@ -5397,6 +5431,16 @@ const libxl_version_info* libxl_get_version_info(libxl_ctx *ctx)
     xc_version(ctx->xch, XENVER_commandline, &u.xen_commandline);
     info->commandline = libxl__strdup(NOGC, u.xen_commandline);
 
+    u.build_id.len = sizeof(u) - sizeof(u.build_id);
+    r = libxl__xc_version_wrap(gc, info, &u.build_id);
+    if (r == -ENOBUFS) {
+            xen_build_id_t *build_id;
+
+            build_id = libxl__zalloc(gc, info->pagesize);
+            build_id->len = info->pagesize - sizeof(*build_id);
+            r = libxl__xc_version_wrap(gc, info, build_id);
+            if (r) LOGEV(ERROR, r, "getting build_id");
+    }
  out:
     GC_FREE;
     return info;
diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
index 8ff5f31..2c0f868 100644
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -247,6 +247,12 @@
 #define LIBXL_HAVE_APIC_ASSIST 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 c3161f3..9840f3b 100644
--- a/tools/libxl/libxl_types.idl
+++ b/tools/libxl/libxl_types.idl
@@ -365,6 +365,7 @@ 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 6346017..ac7d759 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -5920,6 +5920,7 @@ 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;
 }
-- 
2.5.0


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