+/* If the basic path matches maildirfolder_create_regex, we are dealing with
+a subfolder, and should ensure that a maildirfolder file exists. */
+
+if (maildirfolder_create_regex)
+ {
+ int err;
+ PCRE2_SIZE offset;
+ const pcre2_code * re;
+
+ DEBUG(D_transport) debug_printf("checking for maildirfolder requirement\n");
+
+ if (!(re = pcre2_compile((PCRE2_SPTR)maildirfolder_create_regex,
+ PCRE2_ZERO_TERMINATED, PCRE_COPT, &err, &offset, pcre_cmp_ctx)))
+ {
+ uschar errbuf[128];
+ pcre2_get_error_message(err, errbuf, sizeof(errbuf));
+ addr->message = string_sprintf("appendfile: regular expression "
+ "error: %s at offset %ld while compiling %s", errbuf, (long)offset,
+ maildirfolder_create_regex);
+ return FALSE;
+ }
+
+ if (regex_match(re, path, -1, NULL))
+ {
+ uschar *fname = string_sprintf("%s/maildirfolder", path);
+ if (Ustat(fname, &statbuf) == 0)
+ {
+ DEBUG(D_transport) debug_printf("maildirfolder already exists\n");
+ }
+ else
+ {
+ int fd = Uopen(fname, O_WRONLY|O_APPEND|O_CREAT, 0600);
+ if (fd < 0)
+ {
+ addr->message = string_sprintf("appendfile: failed to create "
+ "maildirfolder file in %s directory: %s", path, strerror(errno));
+ return FALSE;
+ }
+ (void)close(fd);
+ DEBUG(D_transport) debug_printf("created maildirfolder file\n");
+ }
+ }
+ else
+ {
+ DEBUG(D_transport) debug_printf("maildirfolder file not required\n");
+ }
+ }
+
+return TRUE; /* Everything exists that should exist */