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implement Pipe, Fsmodule;
include "sys.m";
sys: Sys;
include "draw.m";
include "sh.m";
sh: Sh;
Context: import sh;
include "alphabet/reports.m";
Report: import Reports;
include "alphabet/fs.m";
fs: Fs;
Option, Value, Fschan: import fs;
Skip, Next, Down, Quit: import fs;
Pipe: module {};
# 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 "rxc-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;
fs = load Fs Fs->PATH;
if(fs == nil)
badmod(Fs->PATH);
fs->init();
sh = load Sh Sh->PATH;
if(sh == nil)
badmod(Sh->PATH);
sh->initialise();
}
run(drawctxt: ref Draw->Context, nil: 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;
}
c := (hd args).x().i;
cmd := (hd tl args).c().i;
sync := chan of string;
spawn execproc(drawctxt, sync, oneflag, pflag, c, cmd);
sync <-= nil;
return ref Value.Vr(sync);
}
execproc(drawctxt: ref Draw->Context, sync: chan of string, oneflag, pflag: int,
c: Fschan, cmd: ref Sh->Cmd)
{
sys->pctl(Sys->NEWFD, 0::1::2::nil);
ctxt := Context.new(drawctxt);
<-sync;
if(<-sync != nil){
(<-c).t1 <-= Quit;
exit;
}
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;
sync <-= "cannot make pipe";
exit;
}
}
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;
sync <-= "truncated write";
exit;
}
(<-c).t1 <-= Skip;
break;
}
}
if(!oneflag){
fd = nil;
<-result;
}
}
fd = nil;
if(oneflag)
sync <-= <-result;
else
sync <-= nil;
}
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;
}
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