This originated in the cliconfig code to write out credentials files. The
Windows implementation of this in particular was quite onerous to get
right because it needs a very specific sequence of operations to avoid
running into exclusive file locks, and so by factoring this out with
only cosmetic modification we can avoid repeating all of that engineering
effort for other atomic file writing use-cases.
This new implementation is not yet used, but should eventually replace the
technique of composing together various types from the svchost/auth
package, since our requirements are now complex enough that they're more
straightforward to express in direct code within a single type than as
a composition of the building blocks in the svchost/auth package.
This is just a wholesale move of the CLI configuration types and functions
from the main package into its own package, leaving behind some type
aliases and wrappers for now to keep existing callers working.
This commit alone doesn't really achieve anything, but in future commits
we'll expand the functionality in this package.
Martin Atkins