setting-tests-env-vars: make eatmydata configurable

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/setting-tests-env-vars b/setting-tests-env-vars
index f34711e5a1bc44b1d0b14849298bbad2382bb3fe..e89652d17b792807ed856f575539cbc056c34a49 100755 (executable)
--- a/setting-tests-env-vars
+++ b/setting-tests-env-vars
@@ -1,6 +1,8 @@
 #!/bin/sh
 
-export DGIT_TEST_RUN_PFX=eatmydata
+${DGIT_TEST_RUN_PFX=eatmydata}
+export DGIT_TEST_RUN_PFX
+
 export DGIT_TESTS_TMPDIR=/run/user/`id -u`/dgit-tests-tmp
 
 exec "$@"