tags: add safety check for len(record) while reading hgtagsfnodescache I am trying to fix a breakage where somehow we end up getting a node of 12 length from `getfnode()`. Understanding the hgtagsfnodescache code, it seems highly unlikely that it can happen unless one of `mctx.readfast().get()` or `ctx.filenode()` is returning a node of 12 length. For safety, I think it's better to add a check to make sure that record which we are parsing is of same length we are expecting otherwise we consider that as invalid record. Differential Revision: https://phab.mercurial-scm.org/D9169

procutil: allow to specify arbitrary stdin bytes to runbgcommand For automatic clonebundles generation I need to pass arbitrary large amount of data to the process (eg: common nodes, target nodes). I am updating the `runbgcommand` to allow for this. Previously not stdin input was possible, now, one can provide raw bytes and they will be feed to the command through an unnamed temporary files. Differential Revision: https://phab.mercurial-scm.org/D9212

clonebundle: move the manifest filename to a constant I am about to add more reference to it, so I would rather have it an explicit constant. This allow to unify various call too. Differential Revision: https://phab.mercurial-scm.org/D9209