display process title in syslog when a gotd child process exits

get rid of gotd client_id field where it is not needed This ID was necessary back when session and repo processes supported connections from multiple clients. Nowadays, these processes run per connection and exit once a single client session has been served. The other processes already identify the client via the session/repo file descriptor which has sent an imsg.

portable: enable got-notify-email Now that gotd has the start of helpers, got-notify-email is the first. This is still behind the --enable-gotd flag.

plug some fd leaks in the fdopen{,dir} error paths There's also a memory leak fixed. ok stsp@

remove unneded wbuf->fd = -1 There's no need to set the fd to -1 on ibufs created with imsg_create(3), and it was probably never needed.

convert to use imsg_get_fd() While here also fix a fd leak in got-read-pack. We were dup'ing imsg.fd without closing imsg.fd later; instead just use imsg_get_fd() to extract the file descriptor. Tested by falsifian and Kyle Ackerman, thanks! 'go ahead' stsp@

portable: gotd/gitwrapper: update for libs Bring gotd and gitwrapper closer to how libraries are detected.

fix typo in gotd debug messages: receving -> receiving

add support for protecting references against 'got send -f' to gotd ok op@

gotd: remove more (all?) double process names in log

gotd: Fix more double process names Patch by Josiah Frentsos, thanks!

make gotd repo_read store want/have commit IDs in ID sets rather than arrays Currently only used to detect and avoid storing duplicate IDs sent in want and have lines by the client. If in the future we ever wanted to check which IDs the client has already sent us we could now do O(1) hash table lookups rather than iterating arrays. ok op@

portable: rework SHA detection Simply the SHA detection by not predicating on libcrypto, but instead checking individual header files.

portable: remove sha1.h; found portably Remove sha1.h as this is found portably across systems.

rename lib/sha1.c to lib/hash.c It will soon grow functions to deal with sha256 too. stsp@ agrees.

include sha2.h too where sha1.h is included In preparation for wide sha256 support; stsp@ agrees. Change done mechanically with find . -iname \*.[cy] -exec sam {} + X ,x/<sha1\.h>/i/\n#include <sha2.h>

unbreak gotd build after recent change to got_pack_create

do not expect to see a DISCONNECT message in repo processes The parent no longer sends this message. Perform related cleanup in the shutdown path instead. ok op@

gotd: delete trailing blanks spotted while re-reading

add a gotd session process, split off from the parent process The new session process is able to manipulate files in the repository and keeps track of the read/write client session state. The parent process now restricts its view of the filesystem to the absolute path stored in argv[0], and combines this with unveil "x" on this path. As a result the parent process can only re-exec itself. small tweaks + ok op@

convert gotd repo_read.c and repo_write.c to single-client Because these processes are now started on demand per client connection there is no need to keep track of multiple clients anymore. Also, these processes can now exit when a disconnect event is received. ok op, jamsek

fork gotd repo_read/repo_write children on demand ok op, jamsek

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@

rename GOTD_SOCK_FILENO to GOTD_FILENO_MSG_PIPE for clarity (it's not a socket)

make gotd work as intended on an empty repository; regression test is upcoming