When we process an SSH URL, we intentionally strip off the slash at the
beginning of the URL. While that was convenient for
git-lfs-authenticate, it also prevents us from handling an absolute path
in git-lfs-transfer, since the path will have its leading slash stripped
off and will therefore be relative.
Instead, let's adopt Git's behavior, which is to not remove the leading
slash. This is an incompatible change, but we're about to do a major
release, so it's a good time to make it. This will affect both
git-lfs-transfer and git-lfs-authenticate commands, but at least GitHub
already supports the proper syntax.
Note that since we process the non-URL form of SSH remotes by converting
them to a URL and then parsing, let's strip off the leading slash when
we process that form, since there we do have the ability to distinguish
between absolute and relative paths.
Update the lfs-ssh-echo binary to handle this new format.
a0190a6020