CopyFile copies a file.

Env returns metadata about the current CI environment, falling back to LocalEnv if not running on CI.

ExpandPackagesNoVendor expands a cmd/go import path pattern, skipping vendored packages.

GOPATH returns the value that the GOPATH environment variable should be set to.

GoTool returns the command that runs a go tool.

LocalEnv returns build environment metadata gathered from git.

MustRun executes the given command and exits the host process for any error.

RunGit runs a git subcommand and returns its output.

These flags override values in build env.

Environment contains metadata provided by the build environment.