Description
In Nixpkgs PRs NixOS/nixpkgs#105998 and NixOS/nixpkgs#113580, support for git LFS is added to the Nixpkgs fetchgit function. The problem with fetchgit, however, is that it does not properly support private repositories. Nix' builtins.fetchGit does support private repositories, but it does not seem to support git LFS.
Currently, when trying to builtins.fetchGit a repository with LFS, the following happens:
nix-repl> builtins.fetchGit {url = "[email protected]:my_company/private-lfs-repo.git"; rev = "some_rev";}
Downloading some/lfs/file (123 KB)
Error downloading object: some/lfs/file (a123456): Smudge error: Error downloading some/lfs/file (some_rev): batch request: missing protocol: ""
Errors logged to /home/my-user/nix/gitv2/xxx/lfs/logs/20210309T095658.11111111.log
Use `git lfs logs last` to view the log.
error: external filter 'git-lfs filter-process' failed
error: program 'git' failed with exit code 128
Ideally, it should be possible to builtins.fetchGit the repo either with or without downloading the LFS files. In one use case, the LFS files are used for non-vital things, like tests or documentation. The nix derivations do not depend on those files. Not downloading the LFS files would save space. In another use case, the LFS files are needed to build the derivations, and should therefore be downloaded.
It is possible to export GIT_LFS_SKIP_SMUDGE=1 to accomplish the first use case (i.e. fetch private LFS repository without actually downloading the LFS files), but it would be be much nicer to have it as an option of the builtins.fetchGit function.