Using the SHA512 checksums supplied here, we have verified that all gems match at least one third-party mirror or excluding gems that have been yanked.
Gems that have been yanked are not installable with rubygems or bundler.
Using rubygems_verify.rb 11798 gems were found with 2 or fewer checksums from third-party mirrors or caches, again excluding gems that have been yanked.
These can be found in unverified.2_or_fewer_checksums.txt
All the gems with 2 or fewer checksums are pre-release versions according to:
ruby -ne 'gets =~ /-(.*?)\.gem/; puts $_ unless $1 =~ /[a-zA-Z]' \ unverified.2_or_fewer_checksums.txt
This finds the gem version and checks it for any alphabet character. If it contains any alphabet character it is a pre-release.
Checksums from rubygems.org's S3 repository
Automated Labs mirror checksums
Blue Box mirror checksums
Google third-party depot checksums
Google “ghost” repository checksums
Heroku application caches checksums. This is not a mirror so there are some gems from git here.
The Conversation (theconversation.edu.au/) mirror checksum provided by Samuel Cochran from 17 Nov 2012
Steven Haddox's local gems checksums
AT&T mirror checksums from 26 Nov 2012
RubyGems china mirror checksums. Contains some corrupt gems
NZ Railscamp mirror checksums provided by Nahum Wild (@terrcin)
RubyGems tokyo mirror checksums
Yorick Peterse gem checksums
* Mark was using `puf(1)`, `grep(1)` and similar tools. * Most of the scripts raggi used can be found in the `raggi/` subdirectory.