narrow: remove hack to write narrowspec to shared .hg directory AFAIK, we no longer need it since the narrowspec file was move to the store directory in 576eef1ab43d, "narrow: move .hg/narrowspec to .hg/store/narrowspec."

narrowspec: remove parseserverpatterns() which isn't used anymore Follows up 10a8472f6662, "narrow: drop support for remote expansion."

hg: write narrow patterns after repo creation Now that hg.clone() knows when a narrow clone is requested, it makes sense to have it update the narrow patterns for the repo soon after the repo is created, before any exchange occurs. Previously, the narrow extension was monkeypatching an exchange function to do this. The old code is redundant and has been removed. Differential Revision: https://phab.mercurial-scm.org/D4541

narrow: don't wrap exchange.pull() during clone The wrapped version was setting up the narrow repo requirement when a narrow clone was requested. Previous commits taught hg.clone() and repo creation to add the narrow requirement when a narrow clone was requested. So this requirement should already be set up for us and this code is no longer necessary. Differential Revision: https://phab.mercurial-scm.org/D4540

exchange: support defining narrow file patterns for pull This commit teaches exchange.pull() about the desire to perform a narrow file pull. We simply pass include and exclude patterns to the function. The values are validated and stored on the pulloperation instance. hg.clone() has been taught to pass these arguments to exchange.pull(). If the arguments are not passed to exchange.pull(), the active narrow patterns from the repository will automatically be used. We /could/ always use the narrow patterns from the repo. However, allowing explicit values to be passed in allows us to perform data fetching that doesn't necessarily align with the repo configuration. This provides more flexibility. Differential Revision: https://phab.mercurial-scm.org/D4539

commands: pass include and exclude options to hg.clone() These arguments are defined by the narrow extension. Let's teach core to recognize them so we can delete some code from the narrow extension and start to exercise the in-core code for performing a narrow clone. We have no way of easily testing it, but this change should result in .hg/requires having the narrow requirement from the time the file is written rather than added as part of pull. We'll confirm this when we delete some monkeypatched functions from the narrow extension in later commits. Test output changed because hg.clone() is now receiving patterns and validation of those values is occurring sooner, before the exchange code runs and prints the message that was deleted. Differential Revision: https://phab.mercurial-scm.org/D4538

localrepo: add requirement when narrow files creation option present The previous commit taught hg.clone() to define a creation option when file include or exclude patterns are passed. This commit teaches the new repo creation code to convert that creation option into a repository requirement. While not yet used by the narrow extension, the eventual side-effect of this change is that newly-created repositories will have the narrow requirement from their creation onset. Currently, the requirement is added to the repo at exchange.pull() time via a wrapped function in the narrow extension. Differential Revision: https://phab.mercurial-scm.org/D4537