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acmed: reject -t flag when -e is given, dup stderr to stdout of -e cmd

--- a/sys/src/cmd/ip/acmed.c

+++ b/sys/src/cmd/ip/acmed.c

@@ -23,7 +23,7 @@

 int	debug;

 int	(*challengefn)(char*, char*, char*, int*);

 char	*keyspec;

-char	*provider = "https://acme-v02.api.letsencrypt.org/directory"; /* test endpoint */

+char	*provider = "https://acme-v02.api.letsencrypt.org/directory"; /* default endpoint */

 char	*challengecmd;

 char	*challengeout;

 char	*keyid;

@@ -471,8 +471,9 @@

 	case -1:

 		return -1;

 	case 0:

+		dup(1, 2);

 		execl(challengecmd, challengecmd, ty, dom, tok, auth, nil);

-		exits("exec");

+		sysfatal("%s: %r", challengecmd);

 	}

 	while((w = wait()) != nil){

@@ -832,7 +833,7 @@

 static void

 usage(void)

 {

-	fprint(2, "usage: %s [-a acctkey] [-e cmd | -o chalout] [-p provider] [-t type] acct csr\n", argv0);

+	fprint(2, "usage: %s [-a acctkey] [-e cmd | -o chalout -t type] [-p provider] acct csr\n", argv0);

 	exits("usage");

 }

@@ -844,7 +845,7 @@

 	JSONfmtinstall();

 	fmtinstall('E', Econv);

-	ct = "http";

+	ct = nil;

 	co = nil;

 	acctkey = nil;

 	ARGBEGIN{

@@ -860,29 +861,29 @@

 	case 'o':

 		co = EARGF(usage());

 		break;

-	case 'p':

-		provider = EARGF(usage());

-		break;

 	case 't':

 		ct = EARGF(usage());

 		break;

+	case 'p':

+		provider = EARGF(usage());

+		break;

 	default:

 		usage();

 		break;

 	}ARGEND;

-	if(challengecmd){

-		if(co != nil)

+	if(challengecmd != nil){

+		if(ct != nil || co != nil)

 			usage();

 		challengeout = "/dev/null";

 		challengefn = runchallenge;

-	}else if(strcmp(ct, "http") == 0){

+	}else if(ct == nil || strcmp(ct, "http") == 0){

 		challengeout = (co != nil) ? co : "/usr/web/.well-known/acme-challenge";

 		challengefn = httpchallenge;

 	}else if(strcmp(ct, "dns") == 0){

 		challengeout = (co != nil) ? co : "/lib/ndb/dnschallenge";

 		challengefn = dnschallenge;

-	}else{

+	}else {

 		sysfatal("unknown challenge type '%s'", ct);

 	}

-- 

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