> doesn't work when people use "md5sum -c" to try and check the sums.
True, I just checked it. md5sum -c emits
"no properly formatted MD5 checksum lines found"
for the .md5 files <checksum> produces without the "format" attribute.
> (<checksum> has a "format" attribute now, but that wasn't added until
> ~Dec2006, so I think it requires ant 1.7)
Yes it requires 1.7.
> the way we solved the problem was with the <solr-checksum> macro added
> to our build.xml in this commit...
Looks good! Mind me stealing the macro?