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Comment by jeremyjh | Hacker News Reader

But this is not true. They are interoperable but far from seamless. Those features mainly support migration use cases or things like git deployment from an repo managed in jj. Operations git does are not in jj’s log. You have to constantly import them. The project recommends a single primary interface.

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But it is true. I (and many others) happily use jj on teams that use git without anyone else on the team using jj or knowing (or caring) what I'm using.

I think you are talking about colocation, which is slightly different than the `jj git push` `jj git fetch` type commands.

Colocation has its uses bit is a bit finicky. The push/pull compatibility works perfectly fine (with some caveats of github being broken that can be worked around).

If you constantly switch between the two, you're going to have a hard time, but you can take a git repo, try jj for a while, and if you decide to go back, you don't lose anything.

Right, but that’s different from working in a team environment where everyone else continues using git.

How so? I've used `jj` locally on teams where most (if not all) of the other team members were using git, and they only found out I was using `jj` when I told them.

fwiw I don't use it personally but some people on my team use it while the others use git, and nobody complains.

Yeah same here, have been using jj exclusively, the only reason people notice is because my branch names default to the changeid in my setup so I've had questions about the random looking strings.

No?

What problems, exactly, are you suggesting exist? I have used jj extensively on git teams and it has been seamless. The only people who have noticed or cared are the coworkers I’ve gotten to join me.

You're confusing mixing git and jj in your local copy of the repo vs what it looks like to other people. You can use jj locally, and it interoperates perfectly with any git remote, and no one has to know you're even using it. From the point of view of other people, it doesn't matter.

I don't understand what you mean. The team I currently work with is 100% git while I only use jj anymore, and I've had zero issues?

Most importantly, submodules are not fully supported, which are used by almost every open source project at least in the space I work in (embedded). So you can't use jj to easily contribute back to those project. It can be done but you always have to be cognizant of whether a submodule has changed between two branches or when you sync, since they don't update automatically the way they do with git.

It's been over a year since I last used git manually in the CLI, and I've exclusively worked with git remotes. The only time I had any friction was on a team where stale code-gen output was checked into the repo and for whatever reason no one was willing to either add it to the `.gitignore` or commit (pun intended) to keeping it up to date, meaning that I had to manually remove the changes from when I compiled before pushing. I would have argued in favor of adding to .gitignore or keeping it up to date even if I didn't use `jj` though because I think having stale output checked in is just silly.

For what it's worth, you can have your own local gitignore by adding patterns to .git/info/exclude. It's quite useful in this exact situation.

I did try this, but for whatever reason it kept getting added back automatically. I forget the details of exactly why it was happening because it was close to a year ago, and in the compatibility guide it says this is supported, but I'm not sure if it was at the time or I was running into something different. This was a contract gig for me where I knew it would be ending within a month or so, which meant I didn't bother spending a ton of time trying to figure out a long-term solution.

Interesting, I tried on a recent version so who knows? I do find that sometimes jj is a bit precious with ignored files if the file exists before the ignore rule, even if you untrack. In those situations I almost always "delete/recreate" after the rule is added.

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