Example

<property name="repo.dir" value="./relative/path/to/repo" />
<resolvepath propertyName="repo.dir.resolved" file="${repo.dir}" />

<!-- clone repository -->
<gitclone 
    repository="git://github.com/path/to/repo/repo.git"
    targetPath="${repo.dir.resolved}" />

<!-- create and switch to "mybranch" branch -->
<gitcheckout
    repository="${repo.dir.resolved}" 
    branchname="mybranch" quiet="true" create="true" />

<!-- get back to "master" branch -->
<gitcheckout
    repository="${repo.dir.resolved}" 
    branchname="master" quiet="true" />

<!-- create (force) already created branch -->
<gitcheckout
    repository="${repo.dir.resolved}" 
    branchname="mybranch" quiet="true" 
    forceCreate="true" />