Previously these were hidden behind a general "compression failed" error. ok kn

When running 'make dist', include the correct chroot-*.c file.

When --enable-gotd is present, and gotd empty path or gitwrapper's git libexec path is set, print those out with the other information at the end of the configure script. "N/A" is set where no value is present. Helpful for debugging.

There's no point installing gitwrapper outside of enabling gotd, as this is only used by gotd.

Document the installation and packaging of gitwrapper for -portable

Rather than hard-code assumptions into gitwrapper and gotd binaries, allow for some values to be overriden at compile time. This should help portability.

Reads (git clone) are working but writes (git push) run into an error

Define a standard path to where git stores its libexec helpers. This is always going to be hit-and-miss hard-coded like this, but will suffice for now. Tested on ubuntu 22.04

This is needed for gitwrapper which will fail if its program name cannot be detected properly.

Bring gotd and gitwrapper closer to how libraries are detected.

Include listen.c; make it portable.

This builds gotctl, for the moment via --enable-gotd

When building gotd, also build gotsh.

This enables gotd -- for now, this is opt-in at compile-time, via: ./configure --enable-gotd

This restores the traditional diff -p behaviour in Got.

Some people are eager to try to make Got work just like Git by overlaying the repository and work tree. This causes problems with unveil conflicts at run-time. Fail as early as possible during 'got checkout' when users attempt this. cosmetic tweaks + ok op@