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git/save: leave submodules unmangled

When modifying a submodule, we would garble the
mode, leading to an apparently dangling object.

This fixes the issue.

--- a/sys/src/cmd/git/save.c

+++ b/sys/src/cmd/git/save.c

@@ -15,16 +15,18 @@

 };

 int

-gitmode(int m)

+gitmode(Dirent *e)

 {

-	if(m & DMDIR)		/* directory */

+	if(e->islink)

+		return 0120000;

+	else if(e->ismod)

+		return 0160000;

+	else if(e->mode & DMDIR)

 		return 0040000;

-	else if(m & 0111)	/* executable */

+	else if(e->mode & 0111)

 		return 0100755;

-	else if(m != 0)		/* regular */

+	else

 		return 0100644;

-	else			/* symlink */

-		return 0120000;

 }

 int

@@ -141,7 +143,7 @@

 	for(d = ent; d != ent + nent; d++){

 		if(strlen(d->name) >= 255)

 			sysfatal("overly long filename: %s", d->name);

-		t = seprint(t, etxt, "%o %s", gitmode(d->mode), d->name) + 1;

+		t = seprint(t, etxt, "%o %s", gitmode(d), d->name) + 1;

 		memcpy(t, d->h.h, sizeof(d->h.h));

 		t += sizeof(d->h.h);

 	}