The new function AssignUnassignedFromEnvironment lacks test coverage. Since the pkg/options package has comprehensive testing (as seen in resolve_test.go), this new functionality should also have tests to verify: 1) environment variables are correctly added for unassigned options, 2) already assigned options are not overridden by environment variables, 3) the environment variable prefix is correctly applied, and 4) edge cases like empty values or missing environment variables are handled properly.

done

The exported function AssignUnassignedFromEnvironment is missing documentation. According to Go conventions, all exported functions should have a comment describing what they do. Add a comment describing that this function takes a list of assignments in KEY=VALUE format, a list of option names to check, and an environment variable prefix, and returns a new list with additional assignments from environment variables for any names not already assigned.

done

why are we renaming this?

for generality: I am sure there are other variables that should be propagated, not just git-related...

Do you find the function name somewhat confusing? Based on the usage, I was thinking something along the lines of GetWorkspaceEnvironment, PropagateFromEnvironment, or InheritFromEnvironment.

The function is used in up.go to augment the environment, but in provider/use.go - to set the options from the environment... I think PropagateFromEnvironment would do it; thanks.

What are your thoughts on reducing the complexity from O(n x m) to O(n + m).

func PropagateFromEnvironment(
	assignments []string,
	names []string,
	prefix string,
) []string {
	assigned := assignedNames(assignments)

	result := assignments
	for _, name := range names {
		if assigned[name] {
			continue
		}
		if value, exists := os.LookupEnv(prefix + name); exists {
			result = append(result, name+"="+value)
		}
	}
	return result
}

func assignedNames(assignments []string) map[string]bool {
	names := make(map[string]bool, len(assignments))
	for _, assignment := range assignments {
		if idx := strings.Index(assignment, "="); idx != -1 {
			names[assignment[:idx]] = true
		}
	}
	return names
}

Great! Stealing your code :) Thank you!