[cffi-devel] CFFI darcs repository broken?

[dherring at tentpost.com]

> Digging in a little bit, I rsync'ed the repos from common-lisp.net.  The
> _darcs/inventory file includes only the last 17 changes.  More
> frighteningly, one of the checkpoints in _darcs/checkpoints looks corrupt:
>
> $ gunzip --verbose -c
> 20090616162007-28748-931df2ed8b38d5ad8b6df25ef6f71a9657193d6a.gz >
> 20090616162007-28748-931df2ed8b38d5ad8b6df25ef6f71a9657193d6a
> 20090616162007-28748-931df2ed8b38d5ad8b6df25ef6f71a9657193d6a.gz:
> gzip: 20090616162007-28748-931df2ed8b38d5ad8b6df25ef6f71a9657193d6a.gz:
> invalid compressed data--crc error

http://bugs.darcs.net/issue844
Some versions of darcs misuse gzip, causing checksum corruption.  The
corrupt gzip files can be "fixed" by recalculating the CRC; the attached
heal-darcs.sh shows one such solution.

This corruption affects many (most?) CL darcs repos.  It usually doesn't
affect darcs itself (which ignores the checksums) but often causes
problems with other tools.  I used to notify people of this issue, but now
just run heal-darcs and hope mismatched checksums weren't actually valid.

- Daniel