Marcin Wisnicki wrote:
> On Wed, 28 Jul 2010 15:43:43 +0200, Julian H. Stacey wrote:
>
> >> Mirroring must be atomic (mirror to temporary directory then rename).
> >
> > That could double disc requirement, & reduce mirror sites willing to
> > provide space ?
>
> Indeed it would. But there is no other way to solve it.
>
> Alternatively it could be prevented with no disk cost by putting
> "MIRROR-IN-PROGRESS" file and making all package utilities check for its
> existence and fail with explanation to try again later.
Perhaps a less visible &/or top listing semaphore of ./.MIRROR-IN-PROGRESS ?
Content could be empty, or mirror master could generate into it, eg:
Version: Number of format of .MIRROR-IN-PROGRESS\n
Master-URL: Of master\n
Protocol: Of mirror\n
Date: (GMT) start of mirror\n
Contact: If mirror fails\n
Text: Any other text.\n
EOR: End of record\n
Various FreeBSD etc stuff gets mirrored as nested directories, so
one might want to to be able to check up to N steps up the parent
tree structure for lock(s).
One might also want an optional force- fetch- regardless flag.
Awkward conditions to allow for:
What if mirror is not mirroring when you start your fetch,
but is when you finish ?
What if mirror is not mirroring when you start your fetch,
then mirror starts & finishes a mirror before you finish your fetch ?
One might want to generalise a mechanism that could be added to
multiple tools, eg ports/net/ mirror/ rdist6/ rsync/ ?...
http://wiki.freebsd.org/FreeBSDMirrors by EdwinGroothuis (edwin@)
mentions orphan/ stale mirrors. Perhaps some are even cascaded mirrors ?
I don't see anything in:
http://www.freebsd.org/projects/ideas/ideas.html
"The FreeBSD list of projects and ideas for volunteers"
Maybe someone might add something ?
See also:
mirror-ad...@freebsd.org
http://wiki.freebsd.org/IvanVoras/pkg_patchhttp://wiki.freebsd.org/IvanVoras/pkg_patch
Cheers,
Julian
--
Julian Stacey: BSD Unix Linux C Sys Eng Consultants Munich http://berklix.com
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