[PATCH 4/6] tools: Introduce a non-truncating xc_xenver_changeset()

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

Update libxl and the ocaml stubs to match.  No API/ABI change in either.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Wei Liu <wl@xxxxxxx>
CC: Anthony PERARD <anthony.perard@xxxxxxxxxx>
CC: Juergen Gross <jgross@xxxxxxxx>
CC: Christian Lindig <christian.lindig@xxxxxxxxxx>
CC: David Scott <dave@xxxxxxxxxx>
CC: Edwin Torok <edvin.torok@xxxxxxxxxx>
CC: Rob Hoes <Rob.Hoes@xxxxxxxxxx>
---
 tools/include/xenctrl.h             |  1 +
 tools/libs/ctrl/xc_version.c        |  5 +++++
 tools/libs/light/libxl.c            |  5 +----
 tools/ocaml/libs/xc/xenctrl_stubs.c | 19 ++++++++-----------
 4 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/tools/include/xenctrl.h b/tools/include/xenctrl.h
index 279dc17d67d4..48dbf3eab75f 100644
--- a/tools/include/xenctrl.h
+++ b/tools/include/xenctrl.h
@@ -1610,6 +1610,7 @@ int xc_version(xc_interface *xch, int cmd, void *arg);
  */
 char *xc_xenver_extraversion(xc_interface *xch);
 char *xc_xenver_capabilities(xc_interface *xch);
+char *xc_xenver_changeset(xc_interface *xch);
 
 int xc_flask_op(xc_interface *xch, xen_flask_op_t *op);
 
diff --git a/tools/libs/ctrl/xc_version.c b/tools/libs/ctrl/xc_version.c
index 512302a393ea..9f2cae03dba8 100644
--- a/tools/libs/ctrl/xc_version.c
+++ b/tools/libs/ctrl/xc_version.c
@@ -161,3 +161,8 @@ char *xc_xenver_capabilities(xc_interface *xch)
 {
     return varbuf_simple_string(xch, XENVER_capabilities2);
 }
+
+char *xc_xenver_changeset(xc_interface *xch)
+{
+    return varbuf_simple_string(xch, XENVER_changeset2);
+}
diff --git a/tools/libs/light/libxl.c b/tools/libs/light/libxl.c
index 139e838d1407..80e763aba944 100644
--- a/tools/libs/light/libxl.c
+++ b/tools/libs/light/libxl.c
@@ -582,7 +582,6 @@ const libxl_version_info* libxl_get_version_info(libxl_ctx 
*ctx)
     GC_INIT(ctx);
     union {
         xen_compile_info_t xen_cc;
-        xen_changeset_info_t xen_chgset;
         xen_platform_parameters_t p_parms;
         xen_commandline_t xen_commandline;
         xen_build_id_t build_id;
@@ -607,9 +606,7 @@ const libxl_version_info* libxl_get_version_info(libxl_ctx 
*ctx)
     info->compile_date = libxl__strdup(NOGC, u.xen_cc.compile_date);
 
     info->capabilities = xc_xenver_capabilities(ctx->xch);
-
-    xc_version(ctx->xch, XENVER_changeset, &u.xen_chgset);
-    info->changeset = libxl__strdup(NOGC, u.xen_chgset);
+    info->changeset = xc_xenver_changeset(ctx->xch);
 
     xc_version(ctx->xch, XENVER_platform_parameters, &u.p_parms);
     info->virt_start = u.p_parms.virt_start;
diff --git a/tools/ocaml/libs/xc/xenctrl_stubs.c 
b/tools/ocaml/libs/xc/xenctrl_stubs.c
index 368f4727f0a0..291e92db7300 100644
--- a/tools/ocaml/libs/xc/xenctrl_stubs.c
+++ b/tools/ocaml/libs/xc/xenctrl_stubs.c
@@ -983,27 +983,24 @@ CAMLprim value stub_xc_version_compile_info(value xch)
 }
 
 
-static value xc_version_single_string(value xch, int code, void *info)
+CAMLprim value stub_xc_version_changeset(value xch)
 {
        CAMLparam1(xch);
-       int retval;
+       CAMLlocal1(result);
+       char *changeset;
 
        caml_enter_blocking_section();
-       retval = xc_version(_H(xch), code, info);
+       retval = xc_xenver_changeset(_H(xch));
        caml_leave_blocking_section();
 
-       if (retval)
+       if (!changeset)
                failwith_xc(_H(xch));
 
-       CAMLreturn(caml_copy_string((char *)info));
-}
+       result = caml_copy_string(changeset);
 
+       free(changeset);
 
-CAMLprim value stub_xc_version_changeset(value xch)
-{
-       xen_changeset_info_t ci;
-
-       return xc_version_single_string(xch, XENVER_changeset, &ci);
+       CAMLreturn(result);
 }
 
 
-- 
2.11.0