Add complex checkout test and then fix checkout

This started as a complex new test for checkout going through the
"typechanges" test repository, but that revealed numerous issues
with checkout, including:

* complete failure with submodules
* failure to create blobs with exec bits
* problems when replacing a tree with a blob because the tree
  "example/" sorts after the blob "example" so the delete was
  being processed after the single file blob was created

This fixes most of those problems and includes a number of other
minor changes that made it easier to do that, including improving
the TYPECHANGE support in diff/status, etc.

1 files changed, 7 insertions, 5 deletions

diff --git a/src/fileops.h b/src/fileops.h
index d2944f460..19f7ffd54 100644
--- a/src/fileops.h
+++ b/src/fileops.h
@@ -107,15 +107,17 @@ typedef enum {
  * Remove path and any files and directories beneath it.
  *
  * @param path Path to to top level directory to process.
- *
+ * @param base Root for relative path.
  * @param removal_type GIT_DIRREMOVAL_EMPTY_HIERARCHY to remove a hierarchy
- * of empty directories (will fail if any file is found), GIT_DIRREMOVAL_FILES_AND_DIRS
- * to remove a hierarchy of files and folders, GIT_DIRREMOVAL_ONLY_EMPTY_DIRS to only remove
- * empty directories (no failure on file encounter).
+ *                     of empty directories (will fail if any file is found),
+ *                     GIT_DIRREMOVAL_FILES_AND_DIRS to remove a hierarchy of
+ *                     files and folders,
+ *                     GIT_DIRREMOVAL_ONLY_EMPTY_DIRS to only remove empty
+ *                     directories (no failure on file encounter).
  *
  * @return 0 on success; -1 on error.
  */
-extern int git_futils_rmdir_r(const char *path, git_directory_removal_type removal_type);
+extern int git_futils_rmdir_r(const char *path, const char *base, git_directory_removal_type removal_type);
 
 /**
  * Create and open a temporary file with a `_git2_` suffix.