We use Mercurial 4.3.1 pretty much everywhere in CI now. Mozharness should be testing with it as well. Review commit: https://reviewboard.mozilla.org/r/171244/diff/#index_header See other reviews: https://reviewboard.mozilla.org/r/171244/

We use `hg init` to create the directory. Because this is what typically occurs. We also remove the disabling of "dotencode" in the hgrc. This was added in https://hg.mozilla.org/build/mozharness/rev/b1dbc0f56ff8 (bug 857853) for reasons that are unclear to me. We should never disable dotencode because it may make some repositories not clonable on Windows filesystems. Disabling dotencode will also interfere with the latest version of robustcheckout, which requires its presence. Review commit: https://reviewboard.mozilla.org/r/171246/diff/#index_header See other reviews: https://reviewboard.mozilla.org/r/171246/

The robustcheckout extension from revision 134574b64ddfa4d7c31977d792761cceca67665a of the version-control-tools repo is vendored without modifications. Changes since last time include printing of the Mercurial version and more robust handling repositories not using modern storage requirements. This patch was not explicitly reviewed by glob. But glob reviewed all the robustcheckout changes since the last vendor. So by the transitive property of code review... Review commit: https://reviewboard.mozilla.org/r/171248/diff/#index_header See other reviews: https://reviewboard.mozilla.org/r/171248/