use git commands that allows to setup revision if needed

software/erp5testnode/software.cfg

@@ -57,17 +57,23 @@ command = grep parts ${buildout:develop-eggs-directory}/slapos.cookbook.egg-link
 
 [slapos.cookbook-repository]
 recipe = plone.recipe.command
-stop-on-error = true
 location = ${buildout:parts-directory}/${:_buildout_section_name_}
-command = ${git:location}/bin/git clone -b erp5testnode --quiet http://git.erp5.org/repos/slapos.git ${:location}
-update-command = cd ${:location} && ${git:location}/bin/git pull --quiet
+stop-on-error = true
+repository = http://git.erp5.org/repos/slapos.git
+branch = erp5testnode
+revision =
+command = ${git:location}/bin/git clone --quiet -b ${:branch} ${:repository} ${:location} && if [ -n ${:revision} ]; then cd ${:location} && ${git:location}/bin/git reset --quiet --hard ${:revision} ; fi
+update-command = cd ${:location} && ${git:location}/bin/git pull --quiet && if [ -n ${:revision} ]; then cd ${:location} && ${git:location}/bin/git reset --quiet --hard ${:revision} ; fi
 
 [erp5.util-repository]
 recipe = plone.recipe.command
-stop-on-error = true
 location = ${buildout:parts-directory}/${:_buildout_section_name_}
-command = ${git:location}/bin/git clone --quiet http://git.erp5.org/repos/erp5.git ${:location}
-update-command = cd ${:location} && ${git:location}/bin/git pull --quiet
+stop-on-error = true
+repository = http://git.erp5.org/repos/erp5.git
+branch = master
+revision =
+command = ${git:location}/bin/git clone --quiet -b ${:branch} ${:repository} ${:location} && if [ -n ${:revision} ]; then cd ${:location} && ${git:location}/bin/git reset --quiet --hard ${:revision} ; fi
+update-command = cd ${:location} && ${git:location}/bin/git pull --quiet && if [ -n ${:revision} ]; then cd ${:location} && ${git:location}/bin/git reset --quiet --hard ${:revision} ; fi
 
 [versions]
 # Use SlapOS patched zc.buildout