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tree-walk: learn get_tree_entry_follow_symlinks

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Add a new function, get_tree_entry_follow_symlinks, to tree-walk.[ch].
The function is not yet used.  It will be used to implement git
cat-file --batch --follow-symlinks.

The function locates an object by path, following symlinks in the
repository.  If the symlinks lead outside the repository, the function
reports this to the caller.

Signed-off-by: David Turner <dturner@twopensource.com>
Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
David Turner
2015-05-20 13:03:38 -04:00
committed by Junio C Hamano
parent 8440f74997
commit 275721c267
2 changed files with 224 additions and 0 deletions
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18
tree-walk.h
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@@ -40,6 +40,24 @@ struct traverse_info;
typedef int (*traverse_callback_t)(int n, unsigned long mask, unsigned long dirmask, struct name_entry *entry, struct traverse_info *);
int traverse_trees(int n, struct tree_desc *t, struct traverse_info *info);
enum follow_symlinks_result {
FOUND = 0, /* This includes out-of-tree links */
MISSING_OBJECT = -1, /* The initial symlink is missing */
DANGLING_SYMLINK = -2, /*
* The initial symlink is there, but
* (transitively) points to a missing
* in-tree file
*/
SYMLINK_LOOP = -3,
NOT_DIR = -4, /*
* Somewhere along the symlink chain, a path is
* requested which contains a file as a
* non-final element.
*/
};
enum follow_symlinks_result get_tree_entry_follow_symlinks(unsigned char *tree_sha1, const char *name, unsigned char *result, struct strbuf *result_path, unsigned *mode);
struct traverse_info {
struct traverse_info *prev;
struct name_entry name;