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git/serve: accept the same ref formats as git/get

--- a/sys/src/cmd/git/serve.c

+++ b/sys/src/cmd/git/serve.c

@@ -179,10 +179,7 @@

 	cleanname(s);

 	if(strncmp(s, "refs/", 5) != 0)

 		return 0;

-	for(; *s != '\0'; s++)

-		if(!isalnum(*s) && strchr("/-_.", *s) == nil)

-			return 0;

-	return 1;

+	return okref(s);

 }

 int

@@ -328,6 +325,28 @@

 }

 int

+mkpath(char *path)

+{

+	char *p;

+

+	p = path;

+	/*

+	 * we assume that the path has been

+	 * checked with validref(), so there

+	 * are no double '/' or odd characters.

+	 */

+	while(1){

+		p = strchr(p, '/');

+		if(p == nil)

+			return 0;

+		*p = 0;

+		if(mkdir(path) == -1)

+			return -1;

+		*p++ = '/';

+	}

+}

+

+int

 updatepack(Conn *c)

 {

 	char buf[Pktmax], packtmp[128], idxtmp[128], ebuf[ERRMAX];

@@ -445,6 +464,10 @@

 			newidx = i;

 		}

 		unref(o);

+		if(mkpath(refpath) == -1){

+			snprint(buf, sizeof(buf), "create path: %r");

+			goto error;

+		}

 		if((fd = create(refpath, OWRITE|OTRUNC, 0644)) == -1){

 			snprint(buf, sizeof(buf), "open ref: %r");

 			goto error;

-- 

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