add got_repo_get_object_format() and use it to avoid hardcoding the digest type in a few places. ok stsp@

replace got_repo_get_gitconfig_extensions with got_repo_has_extension got_repo_get_gitconfig_extensions is only used in gotadmin to check if the preciousObjects extension is active; let's replace it with a function that just checks whether a certain extension is active. It simplifies future changes to the extensions handling. ok stsp@

introduce gotd(8), a Git repository server reachable via ssh(1) This is an initial barebones implementation which provides the absolute minimum of functionality required to serve got(1) and git(1) clients. Basic fetch/send functionality has been tested and seems to work here, but this server is not yet expected to be stable. More testing is welcome. See the man pages for setup instructions. The current design uses one reader and one writer process per repository, which will have to be extended to N readers and N writers in the future. At startup, each process will chroot(2) into its assigned repository. This works because gotd(8) can only be started as root, and will then fork+exec, chroot, and privdrop. At present the parent process runs with the following pledge(2) promises: "stdio rpath wpath cpath proc getpw sendfd recvfd fattr flock unix unveil" The parent is the only process able to modify the repository in a way that becomes visible to Git clients. The parent uses unveil(2) to restrict its view of the filesystem to /tmp and the repositories listed in the configuration file gotd.conf(5). Per-repository chroot(2) processes use "stdio rpath sendfd recvfd". The writer defers to the parent for modifying references in the repository to point at newly uploaded commits. The reader is fine without such help, because Git repositories can be read without having to create any lock-files. gotd(8) requires a dedicated user ID, which should own repositories on the filesystem, and a separate secondary group, which should not have filesystem-level repository access, and must be allowed access to the gotd(8) socket. To obtain Git repository access, users must be members of this secondary group, and must have their login shell set to gotsh(1). gotsh(1) connects to the gotd(8) socket and speaks Git-protocol towards the client on the other end of the SSH connection. gotsh(1) is not an interactive command shell. At present, authenticated clients are granted read/write access to all repositories and all references (except for the "refs/got/" and the "refs/remotes/" namespaces, which are already being protected from modification). While complicated access control mechanism are not a design goal, making it possible to safely offer anonymous Git repository access over ssh(1) is on the road map.

add gotadmin init -b <branch> to specify repo head ref Similar to `git init -b`. Includes a change to `got import` behaviour such that "main" is no longer hardcoded by default; instead, we import to the branch resolved via the repository's HEAD reference unless `got import -b` is used, and only if HEAD cannot be resolved to a branch do we fallback to "main". includes fix plus ok from stsp@

move got_opentempfd out of got_repo_open. ok stsp@ thanks for all the help massaging this diff

fix got_repo_match_object_id() docstring, it is not specific to commits This was a leftover from got_repo_resolve_commit_arg() which was superseded in commit 71a276322e39e17baf5697b5daac8e8fe6ad2ae1

provide separate send {} and fetch {} configuration blocks in got.conf Feature requested by naddy. ok naddy, who also suggested some tweaks that will arrive shortly

add support for the preciousObjects Git extension to 'gotadmin cleanup'

introduce 'gotadmin info'

add a 'reference' directive to remote repositories in got.conf(5) Make use of this in 'got clone' to persist -R option arguments given on the command line in the cloned repository's got.conf(5) file.

add a 'fetch-all-branches' configuration setting to got.conf(5) Set fetch-all-branches in the got.conf(5) file created by 'got clone -a' in order to make a future 'got fetch' act like 'got fetch -a' by default.

Add a refs argument to got_repo_match_object_id(), replacing 'resolve_tags' Make use of this where possible to avoid re-reading references from disk. ok naddy

add fd field to got_repository, modify got_packidx_open to use fds These changes are intended to make got more compatible with FreeBSD's Capsicum. ok stsp

remove now pointless 'check_disk' parameter of got_repo_map_path() suggested by naddy

add "branch" keyword to got.conf which specifies a list of branches to fetch ok tracey