[PATCH v2 4/5] sha1_file: remove relative entries limitation

From: Hui Wang <Hui.Wang@windriver.com>

link_alt_odb_entries() will be called recursively if alternates has valid object store paths, to avoid nesting too deep, the recursive depth is limited to 5, this limitation is reasonable and safe for dead-loop reference situation.

There is another limitation in this function to only permit the 1st level alternates has relative paths, the purpose of this limitation is to avoid inaccurate result when using memcmp() directly to compare two directory path names, e.g. "./a/b/" and "./a/c/e/../../b" should be the same dir, but memcmp() will report they are different dirs, this will introduce the same dir be added twice or dead-loop reference.

Now we have new method to compare two directories and can handle both absolute path and relative path comparison, in addition to we already have max depth 5 limitation, we can safely remove this limitation.

Moreover removing this limitation will make below two usage workable.

usage1: base-repos has relative path in the alternates
        %>git clone --reference base-repos src dest
usage2: src2 has relative path to point src1, src1 has relative path
	to point src
        %>git clone src2 dest

Signed-off-by: Hui Wang <Hui.Wang@windriver.com>
---
 sha1_file.c |   13 ++++---------
 1 files changed, 4 insertions(+), 9 deletions(-)