add a test suite for gotd(8); check basic clone and send functionality

add gotctl(8); initially supported commands are 'info' and 'stop' This will be used by an upcoming regress test suite for gotd(8). ok tracey

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.

update README blurb about 'ssh' requirement for regress tests


document how profiling works

allow regress test data to be stored in locations other than /tmp

Add minimum kcgi version information to README

add tests for 'got clone' and 'got fetch'; requires 'ssh' to work

make our README file point at our website

make tmp dir location a compile-time setting and change gotweb's tmp dir We are not sure whether a gotweb package can own /var/www/tmp on OpenBSD. Moving gotweb's tmp dir to /var/www/got/tmp sidesteps that issue.

add gotweb(8) man page and move README info there; discussed with tracey

document that slowcgi(8) is needed for gotweb, too

merge gotweb's README into top-level README; ok kn tracey

make it possible to run regress tests with packed repositories

direct patch reviews and other discussion away from my private inbox

sync README with pkg/DESCR from the port

trim down 'submitting patches' section of README

retire C tests which depended on Got's own Git repository to run

add 'make release' target; programs now have a version number

README: Use `man -l' not `mandoc | less' Honours MANPAGER and is easier to type.

point people looking for a quick-start guide at got.1 EXAMPLES

wording improvements in README

spell 'Got' consistently in README

include expanded acronym in README