pg_regress: Disable autoruns for cmd.exe on Windows

This is similar to 9886744a361b, to prevent the execution of other
programs due to autorun configurations which could influence the
postmaster startup.

This was originally applied on HEAD as of 83c75ac7fb69 without a
backpatch, but the patch has survived CI and buildfarm cycles.  I have
checked that cmd /d exists down to Windows XP, which should make this
change work correctly in the oldest branches still supported.

Discussion: https://postgr.es/m/20230922.161551.320043332510268554.horikyota.ntt@gmail.com
Backpatch-through: 12

diff --git a/src/test/regress/pg_regress.c b/src/test/regress/pg_regress.c
index d7d5f4af33d92e7179e4751d998e329797b8431d..e275871e8c49e493bfecbdaaa326e08806a9b5b3 100644 (file)
--- a/src/test/regress/pg_regress.c
+++ b/src/test/regress/pg_regress.c
@@ -1126,7 +1126,7 @@ spawn_process(const char *cmdline)
                comspec = "CMD";
 
        memset(&pi, 0, sizeof(pi));
-       cmdline2 = psprintf("\"%s\" /c \"%s\"", comspec, cmdline);
+       cmdline2 = psprintf("\"%s\" /d /c \"%s\"", comspec, cmdline);
 
        if ((restrictedToken =
                 CreateRestrictedProcess(cmdline2, &pi)) == 0)