shithub: clone

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add dry-run mode

--- a/clone.c

+++ b/clone.c

@@ -44,6 +44,7 @@

 int fileprocs = Nfileprocs;

 int blkprocs = Nblkprocs;

 int verbose = 0;

+int dummy = 0;

 long salt;

 Dir *skipdir;

@@ -222,6 +223,8 @@

 	Dir d;

 	if(verbose)

 		print("%s\n", dst);

+	if(dummy)

+		return 1;

 	if(!(sd->mode & 0400)){

 		error("can't clone directory: '%s' permission denied", src);

@@ -268,7 +271,7 @@

 	}

 	while((n = dirread(fd, &dirs)) > 0){

 		for(d = dirs; n; n--, d++){

-			if(d->mode & DMDIR && same(skipdir, d))

+			if(d->mode & DMDIR && !dummy && same(skipdir, d))

 				continue;

 			sn = smprint("%s/%s", src, d->name);

@@ -444,7 +447,7 @@

 			error("can't read: %r");

 			sendul(f->errchan, ~0);

 		}

-		if(n > 0 && pwrite(dfd, buf, n, b->offset) != n){

+		if(!dummy && n > 0 && pwrite(dfd, buf, n, b->offset) != n){

 			error("can't write: %r");

 			sendul(f->errchan, ~0);

 		}

@@ -481,10 +484,12 @@

 			dst = smprint("%s.clone.%ld", f->dst, salt);

 		if(verbose)

 			print("%s\n", f->dst);

-		f->dfd = create(dst, OWRITE, f->mode);

-		if(f->dfd < 0){

-			error("can't create: %r");

-			goto End;

+		if(!dummy){

+			f->dfd = create(dst, OWRITE, f->mode);

+			if(f->dfd < 0){

+				error("can't create: %r");

+				goto End;

+			}

 		}

 		if(clonefile(f) < 0){

 			if(remove(dst) < 0)

@@ -491,6 +496,8 @@

 				error("can't remove: %r");

 			goto End;

 		}

+		if(dummy)

+			goto End;

 		cloneattr(f->dfd, f);

 		if(notemp)

 			goto End;

@@ -504,7 +511,6 @@

 			error("dirfwstat: %r");

 			goto End;

 		}

-

 End:

 		filefree(f);

 		free(dst);

@@ -523,6 +529,9 @@

 	ARGBEGIN{

 	case 'v':

 		verbose++;

+		break;

+	case 'd':

+		dummy++;

 		break;

 	case 'b':

 		blksz = strtol(EARGF(usage()), nil, 0);