krb5 commit [krb5-1.16]: Set error message on KCM get_princ failure

[Greg Hudson]

https://github.com/krb5/krb5/commit/300d87755fc988c6228a328f20a8078efc069866
commit 300d87755fc988c6228a328f20a8078efc069866
Author: Robbie Harwood <rharwood at redhat.com>
Date:   Fri Apr 27 13:51:39 2018 -0400

    Set error message on KCM get_princ failure
    
    This matches the expected behavior from other ccache types.  Most
    notably, the KEYRING equivalent was added in
    c25fc42e8eac7350209df61e4a7b9960d17755ca
    
    (cherry picked from commit 58f60f3df7a625ccdcce23dfadd52dc335fd8da7)
    
    ticket: 8675
    version_fixed: 1.16.1

 src/lib/krb5/ccache/cc_kcm.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/src/lib/krb5/ccache/cc_kcm.c b/src/lib/krb5/ccache/cc_kcm.c
index 0d38b18..a777f27 100644
--- a/src/lib/krb5/ccache/cc_kcm.c
+++ b/src/lib/krb5/ccache/cc_kcm.c
@@ -721,12 +721,18 @@ kcm_get_princ(krb5_context context, krb5_ccache cache,
 {
     krb5_error_code ret;
     struct kcmreq req;
+    struct kcm_cache_data *data = cache->data;
 
     kcmreq_init(&req, KCM_OP_GET_PRINCIPAL, cache);
     ret = cache_call(context, cache, &req, FALSE);
     /* Heimdal KCM can respond with code 0 and no principal. */
     if (!ret && req.reply.len == 0)
         ret = KRB5_FCC_NOFILE;
+    if (ret == KRB5_FCC_NOFILE) {
+        k5_setmsg(context, ret, _("Credentials cache 'KCM:%s' not found"),
+                  data->residual);
+    }
+
     if (!ret)
         ret = k5_unmarshal_princ(req.reply.ptr, req.reply.len, 4, princ_out);
     kcmreq_free(&req);