So I just looked into this, and it seems that GetComponents is not currently
equipped to symlink an entire git repo. This is a silly oversight on my
part; I can fix it, but that would require another patch to GetComponents.
Another possibility would be to create the 'bin' directory and link
GetComponents into bin. Then users could call './bin/GetComponents' or
possibly './bin/CRL/GetComponents', the latter would allow for documentation
to be linked as well.

I suggest to do both, to correct the fact that GetComponents cannot
link whole repositories, and to create and use a "bin" directory in
Cactus.
I made the necessary modifications to GetComponents in svn to support this. I have attached a modified patch to add the git version of GetComponents, which I would like to apply to finally complete the transition. GetComponents will now live at https://github.com/gridaphobe/CRL, and I will add a LaTeX version of the documentation shortly so that it can be built with the rest of the Cactus documentation.

The transition will be a two step process (assuming you are using the development version): the next time you update Cactus, you will get the updated thornlist and svn-GetComponents. Then when you run GetComponents again, it will add the git version, which will be located in Cactus/bin/CRL/GetComponents. This seems to be the most stable process to me.

Eric