X-Git-Url: http://git.annexia.org/?a=blobdiff_plain;f=src%2Fgenerator.ml;h=4f569ba5feb883dc9ec6535a79a0cab11c774c52;hb=5442f45aea522a728fa5b06396d4f08d8506d7de;hp=486b9d88b3d2e1b8ddb7124699c1832561ab5bee;hpb=369872b91ed50e2803dc2837183258776e9868e0;p=libguestfs.git

diff --git a/src/generator.ml b/src/generator.ml
index 486b9d8..4f569ba 100755
--- a/src/generator.ml
+++ b/src/generator.ml
@@ -581,7 +581,15 @@ configure script.
 You can also override this by setting the C<LIBGUESTFS_QEMU>
 environment variable.
 
-Setting C<qemu> to C<NULL> restores the default qemu binary.");
+Setting C<qemu> to C<NULL> restores the default qemu binary.
+
+Note that you should call this function as early as possible
+after creating the handle.  This is because some pre-launch
+operations depend on testing qemu features (by running C<qemu -help>).
+If the qemu binary changes, we don't retest features, and
+so you might see inconsistent results.  Using the environment
+variable C<LIBGUESTFS_QEMU> is safest of all since that picks
+the qemu binary at the same time as the handle is created.");
 
   ("get_qemu", (RConstString "qemu", []), -1, [],
    [InitNone, Always, TestRun (