Clients will send an empty pack file if they are only creating new references and have no objects to upload. Make gotd handle this and add a regression test which triggers the bug. Problem found by op@. The new regression test caught an unrelated issue where the client connection was left lingering after references had been updated, which made 'got send' followed by 'got clone -l' fail with the connection limit configured for the test suite (just one connection is allowed at a time). Fix this as well. ok op@

ok op@

The typeset shell builtin is a ksh(1) feature. It is not available in a pure POSIX sh(1). Use printf(1) to portably perform the same string truncation. tweak and ok op jamsek

ok op, jamsek

ok op@

It's handy to have a "bad unix socket path" error being reported directly from the main process since can get caught by `gotd -n'. ok jamsek stsp

ok jamsek stsp

Defer the absolute path check on argv[0] and log_init so that it becomes possible to run `gotd -n' to check the configuration file and get errors without specifying -d. Erorrs in the configuration now are actually always printed regardless of -d. While here also tweak an error message and print 'configuration OK' if -n ok stsp@

ok jamsek

This eliminates the previous performance cost by making 'got log -d' and tog diff view compute the diffstat while building the diff in a temp file like we do with 'got diff -d'. Also, keep the current 'got log -d' UI as per stsp's suggestion. ok stsp@

I failed to update regress when changing the diffstat summary line in the previous commit to use a singular noun after 1. ok op@ and stsp@