Commits
- Commit:
ba97b2d7ec97e54a025a39e04c0fd59fdd54a57b
- From:
- Stefan Sperling <stsp@stsp.name>
- Date:
add initial support for commit notifications to gotd(8)
At present only email notifications are implemented.
Code for HTTP notifications is not yet finished, hence HTTP-related
documentation remains hidden for now.
This adds a new 'notify' process which has an "exec" pledge. It runs
helper programs which implement the notification transport layer,
such as got-notify-email which speaks SMTP. This design avoids having
to link all of gotd with network libraries and related crypto libraries.
Notification content is generated by the 'repo_write' process. Commit log
messages and diffstats are written to a file which the 'notify' process
will pass on to its helpers on stdin. The default output looks similar
to 'got log -d'. If too many new commits are present the output looks
similar to 'got log -s' instead. Tags always look like 'got tag -l'.
The session process coordinates generation of notifications. It maintains
a notification queue which holds one notification per updated reference,
and passes notification requests from this queue to the 'repo_write'
process for notification content creation and then to the 'notify'
process for notification delivery.
Only one notification can be in flight at a time to avoid file descriptor
starvation if many references get updated in a single client session.
ok op@
- Commit:
9afa3de221045d529287cc3fa75fdc2915aed5c1
- From:
- Stefan Sperling <stsp@stsp.name>
- Date:
add support for protecting references against 'got send -f' to gotd
ok op@
- Commit:
eec68231a79adb345b1a6a3194e5ddb353570356
- From:
- Stefan Sperling <stsp@stsp.name>
- Date:
switch gotd from chroot(2) to unveil(2)
In the future, gotd will fork+exec new processes for each client connection.
Using unveil instead of chroot avoids having to start such processes as root.
The -portable version could use chroot(2) where no equivalent to unveil(2)
exists. A future component which starts new processes will be isolated as
a separate process, which could run as root in the -portable version.
ok op@
- Commit:
13b2bc374c1870ec27b2eeb40efe68fd465f64bb
- From:
- Stefan Sperling <stsp@stsp.name>
- Date:
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.