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vac: add -t flag to exclude temporary files and directories (thanks foura)

--- a/sys/man/1/vac

+++ b/sys/man/1/vac

@@ -4,7 +4,7 @@

 .SH SYNOPSIS

 .B vac

 [

-.B -mqsv

+.B -mqstv

 ] [

 .B -a

 .I vacfile

@@ -165,6 +165,9 @@

 .TP

 .B -s

 Print out various statistics on standard error.

+.TP

+.B -t

+Exclude files and directories with the temporary flag set.

 .TP

 .B -v

 Produce more verbose output on standard error, including the name of the files added to the archive

--- a/sys/src/cmd/vac/vac.c

+++ b/sys/src/cmd/vac/vac.c

@@ -8,7 +8,7 @@

 void

 usage(void)

 {

-	fprint(2, "vac [-imqsv] [-a archive.vac] [-b bsize] [-d old.vac] [-e exclude] [-f new.vac] [-i name] [-h host] [-x excludefile] file...\n");

+	fprint(2, "vac [-imqstv] [-a archive.vac] [-b bsize] [-d old.vac] [-e exclude] [-f new.vac] [-i name] [-h host] [-x excludefile] file...\n");

 	threadexitsall("usage");

 }

@@ -29,6 +29,7 @@

 int qdiff;

 int merge;

 int verbose;

+int notmp;

 char *host;

 VtConn *z;

 VacFs *fs;

@@ -109,6 +110,9 @@

 	case 's':

 		printstats++;

 		break;

+	case 't':

+		notmp++;

+		break;

 	case 'v':

 		verbose++;

 		break;

@@ -422,7 +426,7 @@

 	VacFile *f, *fdiff;

 	VtEntry e;

-	if(!includefile(name)){

+	if(!includefile(name) || (notmp && (d->qid.type&QTTMP))) {

 		warn("excluding %s%s", name, (d->mode&DMDIR) ? "/" : "");

 		return;

 	}