The remote-helper bridges to access data stored in Mercurial and
Bazaar are maintained outside the git.git tree in the repositories
of their primary author:
https://github.com/felipec/git-remote-hg (for Mercurial)
https://github.com/felipec/git-remote-bzr (for Bazaar)
You can pick a directory on your $PATH and download them from these
repositories, e.g.:
$ wget -O $HOME/bin/git-remote-hg \
https://raw.github.com/felipec/git-remote-hg/master/git-remote-hg
$ wget -O $HOME/bin/git-remote-bzr \
https://raw.github.com/felipec/git-remote-bzr/master/git-remote-bzr
$ chmod +x $HOME/bin/git-remote-hg $HOME/bin/git-remote-bzr
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