depth option does not seem to work with libssh2

[ehuss]

Setting the depth parameter doesn't seem to work when using the libssh2 backend.

Reproduction steps

Modify the clone example to set the depth parameter:

diff --git a/examples/clone.c b/examples/clone.c
index 22d9d9b61..d8873cef1 100644
--- a/examples/clone.c
+++ b/examples/clone.c
@@ -90,6 +90,7 @@ int lg2_clone(git_repository *repo, int argc, char **argv)
 	clone_opts.fetch_opts.callbacks.transfer_progress = &fetch_progress;
 	clone_opts.fetch_opts.callbacks.credentials = cred_acquire_cb;
 	clone_opts.fetch_opts.callbacks.payload = &pd;
+	clone_opts.fetch_opts.depth = 1;

 	/* Do the clone */
 	error = git_clone(&cloned_repo, url, path, &clone_opts);

Build with libssh2:

cmake -DUSE_SSH=libssh2 -DBUILD_EXAMPLES=on ..

Run the example trying to clone an ssh URL:

./examples/lg2 clone ssh://[email protected]/libgit2/libgit2.git asdf
SSH Key: /Users/eric/.ssh/id_ed25519
Password: ...

ERROR 12: could not read from remote repository
Bad news:
 could not read from remote repository

Note that it works with the exec backend.

Expected behavior

Should be able to set depth with SSH.

Actual behavior

Get GIT_EEOF GIT_ERROR_NET error.

Version of libgit2 (release number or SHA1)

9f34061

Operating system(s) tested

macOS

[HA55EHH]

Same error here.

[ethomson]

Surprising. I haven't had time to take a look yet; does it work with any backend for you? 🤔

[ehuss]

It works with the default (https) backend, and ssh with the "exec" option. I have not tried any others.

[ethomson]

That's so weird. Thanks for the details.

[Bandeapart1964]

same bug here, http clone with depth is fine, but ssh(libssh2 as backend) will got err: could not read from remote repository