Inside of our networking example code, we have a git2 executable that acts as an entry point to all the different network examples. As such, it is kind of the same like the normal git(1) executable in that it simply arbitrates to the respective subcommands. Let's extend this approach and merge all examples into a single standalone lg2 executable. Instead of building an executable for all the existing examples we have, we now bundle them all inside of the lg2 one and let them be callable via subcommands. In the process, we can get rid of duplicated library initialization, deinitialization and repository discovery code. Instead of having each subcommand handle these on its own, we simply do it inside of the single main function now.
Right now, we have two sets of "common" code, one containing general common code and one containing network common code. As we intend to get rid of the network subdirectory and instead merge all examples into a single standalone executable, this distinction doesn't make a lot of sense now. Furthermore, the common network code is not that big. Let's get rid of the common network code by merging it into the general common code.
This Makefile isn't used anymore and probably won't work anyway. Remove it in favor of the existing CMake build instructions.
Pack file verification
C++ style comment ("//") are not specified by the ISO C90 standard and
thus do not conform to it. While libgit2 aims to conform to C90, we did
not enforce it until now, which is why quite a lot of these
non-conforming comments have snuck into our codebase. Do a tree-wide
conversion of all C++ style comments to the supported C style comments
to allow us enforcing strict C90 compliance in a later commit.
We strive to keep an options structure to many functions to be able to extend options in the future without breaking the API. `git_indexer_new` doesn't have one right now, but we want to be able to add an option for enabling strict packfile verification. Add a new `git_indexer_options` structure and adjust callers to use that.
The getline(3) function call is not part of ISO C and, most importantly, it is not implemented on Microsoft Windows platforms. As our networking example code makes use of getline, this breaks builds on MSVC and MinGW. As this code wasn't built prior to the previous commit, this was never noticed. Fix the error by instead implementing a `readline` function, which simply reads the password from stdin until it reads a newline character.