[PATCH 08 of 10 py3] localrepo: ensure transaction id is fully bytes on py3

[Martin von Zweigbergk]

On Sun, Mar 19, 2017 at 11:26 AM, Augie Fackler <raf at durin42.com> wrote:
> # HG changeset patch
> # User Augie Fackler <augie at google.com>
> # Date 1489900139 14400
> #      Sun Mar 19 01:08:59 2017 -0400
> # Node ID 9e6b585465b7ec033160326a4eb049329a2f83a9
> # Parent  d5e20f704fd722dbf8b0a011b3c9ab7437b4ac82
> localrepo: ensure transaction id is fully bytes on py3
>
> diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
> --- a/mercurial/localrepo.py
> +++ b/mercurial/localrepo.py
> @@ -49,6 +49,7 @@ from . import (
>      peer,
>      phases,
>      pushkey,
> +    pycompat,
>      repoview,
>      revset,
>      revsetlang,
> @@ -1082,7 +1083,10 @@ class localrepository(object):
>                  hint=_("run 'hg recover' to clean up transaction"))
>
>          idbase = "%.40f#%f" % (random.random(), time.time())
> -        txnid = 'TXN:' + hashlib.sha1(idbase).hexdigest()
> +        ha = hashlib.sha1(idbase).hexdigest()

Just for my understanding, what makes idbase bytes on py3 (as
hashlib.sha1() requires)?

> +        if pycompat.ispy3:
> +            ha = ha.encode('latin1')

Every time I see "if pycompat.ispy3:", I feel like we should have
extracted a function instead. Do others agree? What could this method
be called? pycompat.latin1bytes()?

> +        txnid = 'TXN:' + ha
>          self.hook('pretxnopen', throw=True, txnname=desc, txnid=txnid)
>
>          self._writejournal(desc)
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