; Trace epg-tests gpg config finding (Bug#23561)

test/Makefile.in

@@ -169,6 +169,7 @@ WRITE_LOG = > $@ 2>&1 || { STAT=$$?; cat $@; exit $$STAT; }
 ifdef EMACS_HYDRA_CI
 ## On Hydra, always show logs for certain problematic tests.
 lisp/net/tramp-tests.log \
+lisp/epg-tests.log \
 : WRITE_LOG = 2>&1 | tee $@
 endif
 

test/lisp/epg-tests.el

@@ -23,6 +23,7 @@
 
 (require 'ert)
 (require 'epg)
+(require 'trace)
 
 (defvar epg-tests-context nil)
 
@@ -42,7 +43,19 @@
     prog-alist))
 
 (defun epg-tests-find-usable-gpg-configuration (&optional _require-passphrase)
-  (epg-find-configuration 'OpenPGP 'no-cache epg-tests--config-program-alist))
+  ;; Tracing for Bug#23561, but only do it once per run.
+  (if (get-buffer "*trace-output*")
+      (epg-find-configuration 'OpenPGP 'no-cache epg-tests--config-program-alist)
+    (dolist (fun '(epg-find-configuration
+                   executable-find
+                   epg-check-configuration
+                   epg-config--make-gpg-configuration))
+      (trace-function-background fun))
+    (prog1 (unwind-protect
+               (epg-find-configuration 'OpenPGP 'no-cache epg-tests--config-program-alist)
+             (untrace-all))
+      (princ (with-current-buffer "*trace-output*" (buffer-string))
+             #'external-debugging-output))))
 
 (defun epg-tests-passphrase-callback (_c _k _d)
   ;; Need to create a copy here, since the string will be wiped out