stop installing old libexec aliases like "git-init"

I think up to patch 4 here should be near a state that's ready for inclusion.

Although I'm on the fence with the approach in 1/5. Should this be a giant getopt switch statement like that in a helper script? An alternative would be to write out a shell file similar to GIT-BUILD-OPTIONS and source that from this thing. I don't know, what do you all think?

The idea with 4/5 was to make this symlink mode the default in config.mak.uname and have a blacklist of systems like Windows that couldn't deal with it.

Since my ad874608d8 ("Makefile: optionally symlink libexec/git-core binaries to bin/git", 2018-03-13) I see that e.g. Debian and GitLab have started shipping with the INSTALL_SYMLINKS flag, so making that unconditional is the next logical step.

The 5th one is more radical. See
https://public-inbox.org/git/[email protected]/ from back in March for context.

I'd like to say it's ready, but I've spotted some fallout:

* Help like "git ninit" suggesting "git init" doesn't work, this is because load_command_list() in help.c doesn't look out our in-memory idea of builtins, it reads the libexecdir, so if we don't have the programs there it doesn't know about it.

* GIT_TEST_INSTALLED breaks entirely under this, as early as the heuristic for "are we built?" being "do we have git-init in libexecdir?". I tried a bit to make this work, but there's a lot of dependencies there.

* We still (and this is also true of my ad874608d8) hardlink everything in the build dir via a different part of the Makefile, ideally we should do exactly the same thing there so also normal tests and not just GIT_TEST_INSTALLED (if that worked) would test in the same mode.

I gave making that work a bit of a try and gave up in the Makefile jungle.

Ævar Arnfjörð Bjarmason (5):
Makefile: move long inline shell loops in "install" into helper
Makefile: conform some of the code to our coding standards
Makefile: stop hiding failures during "install"
Makefile: add NO_INSTALL_SYMLINKS_FALLBACK switch
Makefile: Add a NO_INSTALL_BUILTIN_EXECDIR_ALIASES flag

 Makefile         |  65 +++++++++++--------------
 install_programs | 124 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 151 insertions(+), 38 deletions(-)
 create mode 100755 install_programs

2.19.1.930.g4563a0d9d0