Re: builtin-clone does not fallback to copy when link fails

[Daniel Barkalow <barkalow@iabervon.org>]

On Tue, 20 May 2008, Brandon Casey wrote:

> Brandon Casey wrote:
> > 
> > When cloning with the new builtin-clone, if the src repo is not
> > on the same disk as the dest repo, cloning fails. This is because
> > hard linking does not fall back to copying like the shell version
> > did.
> > 
> > The shell version also made a distinction between defaulting to
> > hard linking and an explicit request to hard link. In the latter
> > case it would not fall back to copying, but would die.

I think that the shell version's behavior changed at some point, too. I 
think I tried at some point to figure out exactly what the specified 
behavior was, and couldn't come up with anything that entirely matched.

> Something like this (if not too ugly) might do the trick:

I think that's good behavior, but it's kind of ugly. How about:

-----
commit 83afef6a159365c1b9a7a1961cb4c95df24fbcac
Author: Daniel Barkalow <barkalow@iabervon.org>
Date:   Tue May 20 14:15:14 2008 -0400

    Fall back to copying if hardlinking fails
    
    Note that it stops trying hardlinks if any fail.
    
    Signed-off-by: Daniel Barkalow <barkalow@iabervon.org>

diff --git a/builtin-clone.c b/builtin-clone.c
index 8713128..42633ae 100644
--- a/builtin-clone.c
+++ b/builtin-clone.c
@@ -207,13 +207,15 @@ static void copy_or_link_directory(char *src, char *dest)
 
 		if (unlink(dest) && errno != ENOENT)
 			die("failed to unlink %s\n", dest);
-		if (option_no_hardlinks) {
-			if (copy_file(dest, src, 0666))
-				die("failed to copy file to %s\n", dest);
-		} else {
-			if (link(src, dest))
+		if (!option_no_hardlinks) {
+			if (!link(src, dest))
+				continue;
+			if (option_local)
 				die("failed to create link %s\n", dest);
+			option_no_hardlinks = 1;
 		}
+		if (copy_file(dest, src, 0666))
+			die("failed to copy file to %s\n", dest);
 	}
 }