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ream: accept optional adm user argument

this is convenient for one-shot fs initialization

--- a/fns.h

+++ b/fns.h

@@ -10,6 +10,7 @@

 extern Gefs*	fs;

 extern int	debug;

 extern int	permissive;

+extern char*	reamuser;

 #define	UNPACK8(p)	(((uchar*)(p))[0])

 #define	UNPACK16(p)	((((uchar*)(p))[0]<<8)|(((uchar*)(p))[1]))

--- a/main.c

+++ b/main.c

@@ -15,6 +15,7 @@

 int	noauth;

 int	nproc;

 int	permissive;

+char	*reamuser;

 char	*srvname = "gefs";

 char	*dev;

 vlong	cachesz = 512*MiB;

@@ -144,6 +145,7 @@

 		break;

 	case 'r':

 		ream = 1;

+		reamuser = ARGF();

 		break;

 	case 'g':

 		grow = 1;

--- a/ream.c

+++ b/ream.c

@@ -13,9 +13,7 @@

 	Nreamqid,

 };

-char *defaultusers =

-	"-1:adm::\n"

-	"0:none::\n";

+char *defaultusers ="-1:adm::%s\n0:none::\n";

 static void

 fillxdir(Xdir *d, vlong qid, char *name, int type, int mode)

@@ -33,7 +31,7 @@

 }

 static void

-initadm(Blk *r, Blk *u)

+initadm(Blk *r, Blk *u, int nu)

 {

 	char *p, kbuf[Keymax], vbuf[Inlmax];

 	Kvp kv;

@@ -51,7 +49,7 @@

 	setval(r, &kv);

 	fillxdir(&d, Qadmuser, "users", QTFILE, 0664);

-	d.length = strlen(defaultusers);

+	d.length = nu;

 	if(dir2kv(Qadmroot, &d, &kv, vbuf, sizeof(vbuf)) == -1)

 		sysfatal("ream: pack users: %r");

 	setval(r, &kv);

@@ -283,10 +281,17 @@

 		sysfatal("ream: allocate root: %r");

 	holdblk(ab);

 	holdblk(ub);

+	if(reamuser != nil){

+		defaultusers = smprint(

+			"-1:adm::%s\n"

+			"0:none::\n"

+			"1:%s:%s:\n",

+			reamuser, reamuser, reamuser);

+	}

 	memcpy(ub->data, defaultusers, strlen(defaultusers));

 	finalize(ub);

 	syncblk(ub);

-	initadm(ab, ub);

+	initadm(ab, ub, strlen(defaultusers));

 	finalize(ab);

 	syncblk(ab);