When we were prototyping Git support, one of the first things we investigated was having automatic conversion between Hg and Git on the server. We weren't able to get the performance to a level where responsiveness would be acceptable, and maintaining consistency between the two repos was complex.
It's something we might revisit in the distant future. As a middle ground, I've been thinking of implementing support for multiple SCMs in a single repository with the conversion/syncing process left up to the user. But that'll probably take more than a couple of 20% days to bang out. :)
If you're interested, I have some patches against hg-git that make it easier to take an existing Hg repo and convert it to Git (as opposed to the other way around). I haven't had a chance to prepare them to go upstream yet, but my repo's here: [link redacted]
It's something we might revisit in the distant future. As a middle ground, I've been thinking of implementing support for multiple SCMs in a single repository with the conversion/syncing process left up to the user. But that'll probably take more than a couple of 20% days to bang out. :)
If you're interested, I have some patches against hg-git that make it easier to take an existing Hg repo and convert it to Git (as opposed to the other way around). I haven't had a chance to prepare them to go upstream yet, but my repo's here: [link redacted]