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Beaker does not provide any way to change the filesystem type used for the root and boot filesystems. The other problem here is that on RHEL6 the default should be ext4 (that's what anaconda uses if Beaker specifies autopart) but if the job has custom partitions the root and boot filesystems will always be ext3 instead.
The snippet in question is rhts_partitions. If the partitions variable (corresponds to <partitions/> in job xml) or the ondisk variable are not set, Beaker just spits out "autopart" which makes anaconda pick some defaults. If either of those variables are set, Beaker creates root and boot partitions with --fstype set unconditionally to ext3.
We can introduce a ksmeta variable 'rootfstype' for this, with a default value of 'ext3'.
On Gerrit: http://gerrit.beaker-project.org/1288
Beaker 0.9.3 has been released.