Add maven-metadata.xml in Nexus 2 artifacts
Some tools expect maven2 artifacts in Nexus to have a maven-metadata.xml even though e.g. sbt doesn't build that.
To provide fresh maven-metadata for a list of artifacts do:
fab -H <nexus-server> build_metas:<file with list of paths>,<group_id>
The <file with list of paths> is a text file with a path on
each line. The paths are absolute paths to directories where
the maven-metadata.* files should go, i.e. the parent directory
for the versions of artifacts.
To provide fresh maven-metadata for all subdirectories of a root directory which match a certain glob pattern, do:
fab -H <nexus-server> build_metas_for:<root directory>,<glob pattern>,<group_id>
Asterisks etc in the <glob pattern> must be escaped.
Since there are files called maven-metadata.xml at several
levels in the file structure, either task will look for the string
<latest> in such files, and assume that it's a valid directory
to refresh the metadata in, if it finds that tag, and fail if not.
It will then create a new maven-metadata.xml with all
subdirectory names in order as <versions>, and the
last version as <latest> and <release>.
Besides the maven-metadata.xml, the tasks will also generate
appropriate maven-metadata.xml.md5 and maven-metadata.xml.sha1.