[isabelle-dev] http://isabelle.in.tum.de/testboard/

[Makarius]

On Thu, 16 Aug 2012, Alexander Krauss wrote:

>> It could be an NFS corruption of the repository, or just the server 
>> feeling too hot.  I've no real idea.
>
> This seems to be happening regularly now, which is really very annoying.

The testboard is not the main repository; so far the problem did not occur 
again on the latter.  I am still hoping that the main repository is clean.


> * Strip the broken revisions (after making a backup):
>
> cp -a . /some/backup/location
> hg strip -n REV
>
> (Note: This seems to fail with the newest version installed at some machines: 
> here, strip also produces an exception. However, hg 2.1.1 installed at 
> lxbroy10 works).

The release notes for Mercurial 2.1.2 say that option -n (no backup) is 
now ignored, and it seems to have been discontinued later.  What is its 
purpose here anyway?

Generally, it is important to understand that "hg strip" is a 
non-monotonic single-user maintenance operation on the physical 
repository.  It is a matter of last resort, in a situation where a single 
person is sent into the reactor to make some repairs after a meltdown, 
while everybody else is standing outside watching.


 	Makarius