Add template dir and set gid to repo init

This extends git_repository_init_ext further with support for
initializing the repository from an external template directory
and with support for the "create shared" type flags that make a
set GID repository directory.

This also adds tests for much of the new functionality to the
existing `repo/init.c` test suite.

Also, this adds a bunch of new utility functions including a
very general purpose `git_futils_mkdir` (with the ability to
make paths and to chmod the paths post-creation) and a file
tree copying function `git_futils_cp_r`.  Also, this includes
some new path functions that were useful to keep the code
simple.

1 files changed, 14 insertions, 0 deletions

diff --git a/src/path.h b/src/path.h
index 14618b2fc..b6292277f 100644
--- a/src/path.h
+++ b/src/path.h
@@ -58,6 +58,11 @@ extern int git_path_dirname_r(git_buf *buffer, const char *path);
 extern char *git_path_basename(const char *path);
 extern int git_path_basename_r(git_buf *buffer, const char *path);
 
+/* Return the offset of the start of the basename.  Unlike the other
+ * basename functions, this returns 0 if the path is empty.
+ */
+extern size_t git_path_basename_offset(git_buf *buffer);
+
 extern const char *git_path_topdir(const char *path);
 
 /**
@@ -186,6 +191,15 @@ extern bool git_path_contains_dir(git_buf *parent, const char *subdir);
 extern bool git_path_contains_file(git_buf *dir, const char *file);
 
 /**
+ * Prepend base to unrooted path or just copy path over.
+ *
+ * This will optionally return the index into the path where the "root"
+ * is, either the end of the base directory prefix or the path root.
+ */
+extern int git_path_join_unrooted(
+	git_buf *path_out, const char *path, const char *base, ssize_t *root_at);
+
+/**
  * Clean up path, prepending base if it is not already rooted.
  */
 extern int git_path_prettify(git_buf *path_out, const char *path, const char *base);