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While working on gitmod, I noticed that the old root_tree is not being discarded when I stop using it. After tracking what was going on, I noticed that there's an object inside a tree that is not a blob or another tree. It's a commit object. This is from git's repo:

$ git ls-tree v2.28.0 | grep sha1col
160000 commit 855827c583bc30645ba427885caa40c5b81764d2  sha1collisiondetection

I need to add support for it so that it is managed correctly but I was wondering what it represents. Because I was trying to get information about the object and it's not in my repo:

$ git cat-file -p 855827c583bc30645ba427885caa40c5b81764d2
fatal: Not a valid object name 855827c583bc30645ba427885caa40c5b81764d2
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1 Answer 1

Reset to default
3

That's a submodule. You can see that the path (sha1collisiondetection) is indexed in the .gitmodules file in the root of the repository:

[submodule "sha1collisiondetection"]
    path = sha1collisiondetection
    url = https://github.com/cr-marcstevens/sha1collisiondetection.git
    branch = master

The submodule repository will be included at its commit 855827c583bc30645ba427885caa40c5b81764d2. If you git submodule update that submodule, you'll see that it fetches that commit.

Submodule path 'sha1collisiondetection': checked out '855827c583bc30645ba427885caa40c5b81764d2'

And inside that path, you can cat-file that commit.

% git cat-file -p 8558
tree c963fb3e40e0b9a031ffbab4f2f06bfbcc8527b7
parent 16033998da4b273aebd92c84b1e1b12e4aaf7009
author Michael Osipov <[email protected]> 1557389728 +0200
committer Marc Stevens <[email protected]> 1557396519 +0200

Detect endianess on HP-UX

HP-UX is not properly detected and classified as little endian. Add test macro
for HP-UX to make it big endian.
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