implement Fsmodule;include "sys.m";	sys: Sys;include "draw.m";include "sh.m";	sh: Sh;	Context: import sh;include "fslib.m";	fslib: Fslib;	Option, Value, Fschan, Report, quit: import fslib;	Skip, Next, Down, Quit: import fslib;  # pipe the contents of the files in a filesystem through# a command. -1 causes one command only to be executed.# -p and -P (exclusive to -1) cause stat modes to be set in the shell environment.types(): string{	return "vcx-1-p-P";} badmod(p: string){	sys->fprint(sys->fildes(2), "fs: exec: cannot load %s: %r\n", p);	raise "fail:bad module";} init(){	sys = load Sys Sys->PATH;	fslib = load Fslib Fslib->PATH;	if(fslib == nil)		badmod(Fslib->PATH);	sh = load Sh Sh->PATH;	if(sh == nil)		badmod(Sh->PATH);	sh->initialise();} run(drawctxt: ref Draw->Context, report: ref Report,			opts: list of Option, args: list of ref Value): ref Value{	n := 1;	oneflag := pflag := 0;	for(; opts != nil; opts = tl opts){		o := hd opts;		case o.opt {		'1' =>			oneflag = 1;		'p' =>			pflag = 1;		'P' =>			pflag = 2;		}	}	if(pflag && oneflag){		sys->fprint(sys->fildes(2), "fs: exec: cannot specify -p with -1\n");		return nil;	}	cmd := (hd args).c().i;	c := (hd tl args).x().i;	sync := chan of int;	spawn execproc(drawctxt, sync, oneflag, pflag, c, cmd, report.start("exec"));	sync <-= 1;	return ref Value.V(sync);} execproc(drawctxt: ref Draw->Context, sync: chan of int, oneflag, pflag: int,		c: Fschan, cmd: ref Sh->Cmd, errorc: chan of string){	sys->pctl(Sys->NEWFD, 0::1::2::nil);	ctxt := Context.new(drawctxt);	<-sync;	if(<-sync == 0){		(<-c).t1 <-= Quit;		quit(errorc);	}	argv := ref Sh->Listnode(cmd, nil) :: nil;	fd: ref Sys->FD;	result := chan of string;	if(oneflag){		fd = popen(ctxt, argv, result);		if(fd == nil){			(<-c).t1 <-= Quit;			quit(errorc);		}	} 	names: list of string;	name: string;	indent := 0;	for(;;){		(d, reply) := <-c;		if(d.dir == nil){			reply <-= Next;			if(--indent == 0){				break;			}			(name, names) = (hd names, tl names);			continue;		}		if((d.dir.mode & Sys->DMDIR) != 0){			reply <-= Down;			names = name :: names;			if(indent > 0 && name != nil && name[len name - 1] != '/')				name[len name] = '/';			name += d.dir.name;			indent++;			continue;		}		if(!oneflag){			p := name;			if(p != nil && p[len p - 1] != '/')				p[len p] = '/';			setenv(ctxt, "file", p + d.dir.name :: nil);			if(pflag)				setstatenv(ctxt, d.dir, pflag);			fd = popen(ctxt, argv, result);		}		if(fd == nil){			reply <-= Next;			continue;		}		reply <-= Down;		for(;;){			data: array of byte;			((nil, data), reply) = <-c;			reply <-= Next;			if(data == nil)				break;			n := -1;			{n = sys->write(fd, data, len data);}exception {"write on closed pipe" => ;}			if(n != len data){				if(oneflag){					(<-c).t1 <-= Quit;					quit(errorc);				}				(<-c).t1 <-= Skip;				break;			}		}		if(!oneflag){			fd = nil;			<-result;		}	}	fd = nil;	if(oneflag)		<-result;	quit(errorc);} popen(ctxt: ref Context, argv: list of ref Sh->Listnode, result: chan of string): ref Sys->FD{	sync := chan of int;	fds := array[2] of ref Sys->FD;	sys->pipe(fds);	spawn runcmd(ctxt, argv, fds[0], sync, result);	<-sync;	return fds[1];} runcmd(ctxt: ref Context, argv: list of ref Sh->Listnode, stdin: ref Sys->FD, sync: chan of int, result: chan of string){	sys->pctl(Sys->FORKFD, nil);	sys->dup(stdin.fd, 0);	stdin = nil;	sys->pctl(Sys->NEWFD, 0::1::2::nil);	ctxt = ctxt.copy(0);	sync <-= 0;	r := ctxt.run(argv, 0);	ctxt = nil;	sys->pctl(Sys->NEWFD, nil);	result <-=r;} setenv(ctxt: ref Context, var: string, val: list of string){	ctxt.set(var, sh->stringlist2list(val));} setstatenv(ctxt: ref Context, dir: ref Sys->Dir, pflag: int){	setenv(ctxt, "mode", modes(dir.mode) :: nil);	setenv(ctxt, "uid", dir.uid :: nil);	setenv(ctxt, "mtime", string dir.mtime :: nil);	setenv(ctxt, "length", string dir.length :: nil); 	if(pflag > 1){		setenv(ctxt, "name", dir.name :: nil);		setenv(ctxt, "gid", dir.gid :: nil);		setenv(ctxt, "muid", dir.muid :: nil);		setenv(ctxt, "qid", sys->sprint("16r%ubx", dir.qid.path) :: string dir.qid.vers :: nil);		setenv(ctxt, "atime", string dir.atime :: nil);		setenv(ctxt, "dtype", sys->sprint("%c", dir.dtype) :: nil);		setenv(ctxt, "dev", string dir.dev :: nil);	}} mtab := array[] of {	"---",	"--x",	"-w-",	"-wx",	"r--",	"r-x",	"rw-",	"rwx"}; modes(mode: int): string{	s: string; 	if(mode & Sys->DMDIR)		s = "d";	else if(mode & Sys->DMAPPEND)		s = "a";	else if(mode & Sys->DMAUTH)		s = "A";	else		s = "-";	if(mode & Sys->DMEXCL)		s += "l";	else		s += "-";	s += mtab[(mode>>6)&7]+mtab[(mode>>3)&7]+mtab[mode&7];	return s;}