support ls-remote command and git+ssh protocol

[jakecoffman]

The integration test uses a Docker container that doesn't have ssh installed so the commands would fail normally. This is a simpler setup than building a Docker network and achieves the same result. If the docker build fails then the test fails!

[deivid-rodriguez]

Did we try this against dependabot/dependabot-core#7258? I'm afraid it's now going to start "succeeding" now but generating incorrect PRs since it will use "private repo syntax" for the dependency using ssh.

[jakecoffman]

@deivid-rodriguez I haven't cut a release of git-shim and bumped core yet, so all is good still. I'll repro it and see if this changes anything. Thanks for the heads up!

[deivid-rodriguez]

Ok, great! I mean it would not be the end of the world, but generally I consider a completely broken update better than a successful update with the wrong PR contents.

I did try changing git-shim last week to do this, but I think I didn't build the binary properly or I didn't put it at the right path, because it seemed to have no effect

I did change our insteadOf git config commands in core to re-write git+ssh urls too and that did cause the issue I'm taking about here, so I didn't proceed with making that change.

[jakecoffman]

Just tried locally on main with the updated shim, it still fails, but on a git fetch

updater | Progress: resolved 1009, reused 1008, downloaded 0, added 0
updater |  ERROR  Command failed with exit code 128: git fetch --depth 1 origin 32e8e38c7fcd935241b9baab71bb432fd9b166ed
updater | error: cannot run ssh: No such file or directory
updater | fatal: unable to fork
updater | 
updater | pnpm: Command failed with exit code 128: git fetch --depth 1 origin 32e8e38c7fcd935241b9baab71bb432fd9b166ed
updater | error: cannot run ssh: No such file or directory
updater | fatal: unable to fork
updater |     at makeError (/home/dependabot/.cache/node/corepack/pnpm/8.3.1/dist/pnpm.cjs:24230:17)
updater |     at handlePromise (/home/dependabot/.cache/node/corepack/pnpm/8.3.1/dist/pnpm.cjs:24801:33)
updater |     at runMicrotasks (<anonymous>)
updater |     at processTicksAndRejections (node:internal/process/task_queues:96:5)
updater |     at async gitFetcher (/home/dependabot/.cache/node/corepack/pnpm/8.3.1/dist/pnpm.cjs:113224:11)
updater |     at async fetcher (/home/dependabot/.cache/node/corepack/pnpm/8.3.1/dist/pnpm.cjs:125583:16)
updater |     at async run (/home/dependabot/.cache/node/corepack/pnpm/8.3.1/dist/pnpm.cjs:124970:23)

No amount of argument rewriting can fix that since the URL isn't an argument. Looks like the upstream fix is definitely the way to go.

[deivid-rodriguez]

Well, that's good because this patch won't make the behaviour any worse, just make it fail a bit later. Thanks for verifying this!