/* * wrap/wcmp - cmp against package * * can be done without blowing up the * archive thanks to the md5 checksums. */ #include <u.h>#include <libc.h>#include <bio.h>#include <disk.h>#include "wrap.h" int bflag;char *root = "/"; voiddiff(Wrap *w, char *name){	Waitmsg wmsg;	char *flag;	char *wrapped, *local; 	if(bflag)		flag = "-mbn";	else		flag = "-mn"; 	wrapped = mkpath(w->root, name);	local = mkpath(root, name); 	switch(fork()) {	case 0:		execl("/bin/diff", "diff", flag, wrapped, local, nil);		fprint(2, "exec failed\n");		_exits(0);	case -1:		sysfatal("fork failed");	default:		wait(&wmsg);		free(wrapped);		free(local);	}} voidusage(void){	fprint(2, "wrap/wdiff [-b] [-r root] package [prefix...]\n");	exits("usage");} voidmain(int argc, char **argv){	int i;	Wrap *w; 	ARGBEGIN{	case 'b':		bflag = 1;		break;	case 'r':		root = ARGF();		break;	default:		usage();	}ARGEND 	if(argc < 1)		usage(); 	if(access(argv[0], 0) < 0)		sysfatal("no such file '%s'", argv[0]); 	w = openwraphdr(argv[0], root, argv-1, argc+1);	if(w == nil)		sysfatal("no such package found"); 	for(i=1; i<argc; i++)		diff(w, argv[i]);}