Add the ability to always pull git dependency before build.

[ZNackasha]

In my current project I have a dependence that points to a git repo.

[dependencies]
    myproject=  { git = "http://192.168.0.1/thing/thing.git", branch = "master" }

I was wondering if we can add a flag to always pull on build.
something similar to the following.

[dependencies]
    myproject=  { git = "http://192.168.0.1/thing/thing.git", branch = "master", pull_on_build = true }

[thedanhoffman]

I would love to have this feature

[epage]

Could you clarify what you mean by "always pull on build"? Are you wanting us to pull the commit from the lockfile or are you wanting us to discard the commit in the lockfile and get a new commit?

And could you expand on the use case for why you want this?

[weihanglo]

I am assuming Ed you're correct. The author wants cargo to always pull latest changes from git repositories regardless of what was recorded in Cargo.lock.

This doesn't really fit in Cargo.toml and Cargo's build model, as it drastically increase the build time since Cargo then needs to fetch changes every time when running cargo build. What else doesn't fit is that it's unclear whether the pull-on-build key is infectious to downstream crate users.

I am a bit not satisfied if it is what was proposed. I believe Cargo should maintain reproducibility and reduce recompile as much as it could. User should be conscious when a dependency changes.

Besides, I think this can be done by cargo update -p <pkgid> with the package specified. What else is missing might be a way to bulk update a set of packages with given patterns.