2 Documentation Nexus repository access keywords, and supporting Java and Maven handling.
4 ... Copyright (c) 2015,2016 Cisco Systems, Inc. and others. All rights reserved.
6 ... This program and the accompanying materials are made available under the
7 ... terms of the Eclipse Public License v1.0 which accompanies this distribution,
8 ... and is available at http://www.eclipse.org/legal/epl-v10.html
11 ... This library encapsulates a bunch of somewhat complex and commonly used
12 ... Nexus operations into reusable keywords to make writing test suites easier.
14 ... Currently, Java version detection is incorporated so that Java tools can be run reliably.
15 ... Also, suport for installing and running Maven is added, as that needs the Java detection.
16 ... TODO: Move Java detection and Maven to a separate Resource, or rename this Resource.
18 Library OperatingSystem
23 Library RequestsLibrary
24 Resource ${CURDIR}/CompareStream.robot
25 Resource ${CURDIR}/SSHKeywords.robot
26 Resource ${CURDIR}/Utils.robot
29 &{COMPONENT_MAPPING} netconf=netconf-impl bgpcep=pcep-impl carpeople=clustering-it-model yangtools=yang-data-impl bindingv1=mdsal-binding-generator-impl odl-micro=odlmicro-impl
30 @{RELEASE_INTEGRATED_COMPONENTS} mdsal odlparent yangtools carpeople
32 ${JAVA_8_HOME_CENTOS} /usr/lib/jvm/java-1.8.0
33 ${JAVA_8_HOME_UBUNTU} /usr/lib/jvm/java-8-openjdk-amd64
34 ${JAVA_11_HOME_CENTOS} /usr/lib/jvm/java-11-openjdk
35 ${JAVA_11_HOME_UBUNTU} /usr/lib/jvm/java-11-openjdk-amd64
36 ${JAVA_OPTIONS} -Xmx2560m # Note that '-Xmx=3g' is wrong syntax. Also 3GB heap may not fit in 4GB RAM.
37 ${MAVEN_DEFAULT_OUTPUT_FILENAME} default_maven.log
38 ${MAVEN_OPTIONS} -Pq -Djenkins
39 ${MAVEN_REPOSITORY_PATH} /tmp/r
40 ${MAVEN_SETTINGS_URL} https://raw.githubusercontent.com/opendaylight/odlparent/master/settings.xml
41 ${MAVEN_VERSION} 3.3.9
42 ${NEXUS_FALLBACK_URL} ${NEXUSURL_PREFIX}/content/repositories/opendaylight.snapshot
43 ${NEXUS_RELEASE_BASE_URL} https://nexus.opendaylight.org/content/repositories/opendaylight.release
44 ${NEXUS_RELEASES_URL} ${NEXUS_RELEASE_BASE_URL}/org/opendaylight/integration/opendaylight
47 Initialize_Artifact_Deployment_And_Usage
48 [Arguments] ${tools_system_connect}=True
49 [Documentation] Places search utility to ODL system, which will be needed for version detection.
50 ... By default also initialize a SSH connection to Tools system,
51 ... as following Keywords assume a working connection towards target system.
52 # Connect to the ODL machine.
53 ${odl} = SSHKeywords.Open_Connection_To_ODL_System
54 # Deploy the search tool.
55 SSHLibrary.Put_File ${CURDIR}/../../tools/deployment/search.sh
56 SSHLibrary.Close_Connection
57 # Optionally connect to the Tools System machine.
58 BuiltIn.Return_From_Keyword_If not (${tools_system_connect}) # the argument may be a convoluted Python expression
59 SSHKeywords.Open_Connection_To_Tools_System
61 NexusKeywords__Get_Items_To_Look_At
62 [Arguments] ${component}
63 [Documentation] Get a list of items that might contain the version number that we are looking for.
65 ... &{COMPONENT_MAPPING} is the centralized place to maintain the mapping
66 ... from a stream independent component nickname to the list of artifact names to search for.
67 Collections.Dictionary_Should_Contain_Key ${COMPONENT_MAPPING} ${component} Component not supported by NexusKeywords version detection: ${component}
68 BuiltIn.Run_Keyword_And_Return Collections.Get_From_Dictionary ${COMPONENT_MAPPING} ${component}
70 NexusKeywords__Detect_Version_To_Pull
71 [Arguments] ${component}
72 [Documentation] Determine the exact Nexus directory to be used as a source for a particular test tool
73 ... Figure out what version of the tool needs to be pulled out of the
74 ... Nexus by looking at the version directory of the subsystem from
75 ... which the tool is being pulled. This code is REALLY UGLY but there
76 ... is no way around it until the bug
77 ... https://bugs.opendaylight.org/show_bug.cgi?id=5206 gets fixed.
78 ... I also don't want to depend on maven-metadata-local.xml and other
79 ... bits and pieces of ODL distribution which are not required for ODL
80 ... to function properly.
81 ${itemlist} = NexusKeywords__Get_Items_To_Look_At ${component}
82 ${current_ssh_connection} = SSHLibrary.Get Connection
83 SSHKeywords.Open_Connection_To_ODL_System
84 ${version} ${result} = SSHLibrary.Execute_Command sh search.sh ${WORKSPACE}/${BUNDLEFOLDER}/system ${itemlist} return_rc=True
85 SSHLibrary.Close_Connection
86 SSHKeywords.Restore Current SSH Connection From Index ${current_ssh_connection.index}
87 BuiltIn.Log ${version}
88 BuiltIn.Run_Keyword_If ${result}!=0 BuiltIn.Fail Component "${component}": searching for "${itemlist}" found no version, cannot locate test tool.
89 ${version} ${location} = String.Split_String ${version} max_split=1
90 [Return] ${version} ${location}
94 [Documentation] On active SSH conenction execute download ${url} command, log output, check RC and return file name.
95 ${filename} = String.Fetch_From_Right ${url} /
96 ${response} ${result} = SSHLibrary.Execute_Command wget -q -N '${url}' 2>&1 return_rc=True
97 BuiltIn.Log ${response}
98 BuiltIn.Run_Keyword_If ${result} != 0 BuiltIn.Fail File ${filename} could not be downloaded from ${url}
102 [Arguments] ${component} ${artifact} ${name_prefix}=${artifact}- ${name_suffix}=-executable.jar ${fallback_url}=${NEXUS_FALLBACK_URL} ${explicit_url}=${EMPTY} ${build_version}=${EMPTY} ${build_location}=${EMPTY}
103 [Documentation] Deploy the specified artifact from Nexus to the cwd of the machine to which the active SSHLibrary connection points.
104 ... ${component} is a name part of an artifact present in system/ of ODl installation with the same version as ${artifact} should have.
105 ... Must have ${BUNDLE_URL} variable set to the URL from which the
106 ... tested ODL distribution was downloaded and this place must be
107 ... inside a repository created by a standard distribution
108 ... construction job. If this is detected to ne be the case, fallback URL is used.
109 ... If ${explicit_url} is non-empty, Deploy_From_Utrl is called instead.
110 ... TODO: Allow deploying to a specific directory, we have SSHKeywords.Execute_Command_At_Cwd_Should_Pass now.
111 BuiltIn.Run_Keyword_And_Return_If """${explicit_url}""" != "" Deploy_From_Url ${explicit_url}
112 ${urlbase} = String.Fetch_From_Left ${BUNDLE_URL} /org/opendaylight
113 # If the BUNDLE_URL points somewhere else (perhaps *patch-test* job in Jenkins),
114 # ${urlbase} is the whole ${BUNDLE_URL}, in which case we use the ${fallback_url}
115 # If we are working with a "release integrated" project, we always will want to look for
116 # a released version, not in the snapshots
117 ${urlbase} = BuiltIn.Set_Variable_If '${urlbase}' != '${BUNDLE_URL}' ${urlbase} ${fallback_url}
118 CompareStream.Run_Keyword_If_At_Most_Magnesium Collections.Remove_Values_From_List ${RELEASE_INTEGRATED_COMPONENTS} carpeople
119 ${urlbase} = BuiltIn.Set_Variable_If '${component}' in @{RELEASE_INTEGRATED_COMPONENTS} ${NEXUS_RELEASE_BASE_URL} ${urlbase}
120 ${version} ${location} = BuiltIn.Run_Keyword_If '${build_version}'=='${EMPTY}' NexusKeywords__Detect_Version_To_Pull ${component}
121 ... ELSE BuiltIn.Set_Variable ${build_version} ${build_location}
122 # TODO: Use RequestsLibrary and String instead of curl and bash utilities?
123 ${url} = BuiltIn.Set_Variable ${urlbase}/${location}/${artifact}/${version}
124 # TODO: Review SSHKeywords for current best keywords to call.
125 ${metadata} = SSHKeywords.Execute_Command_Should_Pass curl -L ${url}/maven-metadata.xml
126 ${status} ${namepart} = BuiltIn.Run_Keyword_And_Ignore_Error SSHKeywords.Execute_Command_Should_Pass echo "${metadata}" | grep value | head -n 1 | cut -d '>' -f 2 | cut -d '<' -f 1 stderr_must_be_empty=${True}
127 ${length} = BuiltIn.Get_Length ${namepart}
128 ${namepart} = BuiltIn.Set_Variable_If "${status}" != "PASS" or ${length} == 0 ${version} ${namepart}
129 ${filename} = BuiltIn.Set_Variable ${name_prefix}${namepart}${name_suffix}
130 BuiltIn.Log ${filename}
131 ${url} = BuiltIn.Set_Variable ${url}/${filename}
132 ${response} ${result} = SSHLibrary.Execute_Command wget -q -N '${url}' 2>&1 return_rc=True
133 BuiltIn.Log ${response}
134 BuiltIn.Run_Keyword_If ${result} != 0 BuiltIn.Fail Artifact "${artifact}" in component "${component}" could not be downloaded from ${url}
138 [Arguments] ${component} ${artifact} ${suffix}=executable ${fallback_url}=${NEXUS_FALLBACK_URL} ${explicit_url}=${EMPTY} ${build_version}=${EMPTY} ${build_location}=${EMPTY}
139 [Documentation] Deploy a test tool.
140 ... The test tools have naming convention of the form
141 ... "<repository_url>/some/dir/somewhere/<tool-name>/<tool-name>-<version-tag>-${suffix}.jar"
142 ... where "<tool-name>" is the name of the tool and "<version-tag>" is
143 ... the version tag that is digged out of the maven metadata. This
144 ... keyword calculates ${name_prefix} and ${name_suffix} for
145 ... "Deploy_Artifact" and then calls "Deploy_Artifact" to do the real
146 ... work of deploying the artifact.
147 ${name_prefix} = BuiltIn.Set_Variable ${artifact}-
148 ${extension} = BuiltIn.Set_Variable_If '${component}'=='odl-micro' tar jar
149 ${name_suffix} = BuiltIn.Set_Variable_If "${suffix}" != "" -${suffix}.${extension} .${extension}
150 ${filename} = Deploy_Artifact ${component} ${artifact} ${name_prefix} ${name_suffix} ${fallback_url}
151 ... ${explicit_url} ${build_version} ${build_location}
154 Install_And_Start_Java_Artifact
155 [Arguments] ${component} ${artifact} ${suffix}=executable ${tool_options}=${EMPTY} ${java_options}=${EMPTY} ${openjdk}=${JDKVERSION}
156 ... ${fallback_url}=${NEXUS_FALLBACK_URL} ${explicit_url}=${EMPTY}
157 [Documentation] Deploy the artifact, assign name for log file, figure out java command, write the command to active SSH connection and return the log name.
158 ... This keyword does not examine whether the artifact was started successfully or whether is still running upon return.
159 # TODO: Unify this keyword with what NexusKeywords.Install_And_Start_Testtool does.
160 ${actual_java_options} = BuiltIn.Set_Variable_If """${java_options}""" != "" ${java_options} ${JAVA_OPTIONS}
161 ${filename} = Deploy_Test_Tool ${component} ${artifact} ${suffix} ${fallback_url} ${explicit_url}
162 ${command} = Compose_Full_Java_Command ${actual_java_options} -jar ${filename} ${tool_options}
163 ${logfile} = Utils.Get_Log_File_Name ${artifact}
164 SSHLibrary.Write ${command} >${logfile} 2>&1
167 Compose_Dilemma_Filepath
168 [Arguments] ${default_path} ${specific_path}
169 [Documentation] Query active SSH connection, return specific path if it exists else default path.
170 ${out} ${rc} = SSHLibrary.Execute_Command ls -lA ${specific_path} 2>&1 return_rc=True
171 BuiltIn.Return_From_Keyword_If ${rc} == 0 ${specific_path}
172 BuiltIn.Return_From_Keyword ${default_path}
174 Compose_Base_Java_Command
175 [Arguments] ${openjdk}=${JDKVERSION}
176 [Documentation] Return string suitable for launching Java programs over SSHLibrary, depending on JRE version needed.
177 ... This requires that the SSH connection on which the command is going to be used is active as it is needed for querying files.
178 ... Commands composed for one SSH connection shall not be reused on other SSH connections as the two connections may have different Java setups.
179 ... Not directly related to Nexus, but versioned Java tools may need this.
180 # Check whether the user set the override and return it if yes.
181 BuiltIn.Run_Keyword_And_Return_If """${openjdk}""" == "openjdk8" Compose_Dilemma_Filepath ${JAVA_8_HOME_CENTOS}/bin/java ${JAVA_8_HOME_UBUNTU}/bin/java
182 BuiltIn.Run_Keyword_And_Return_If """${openjdk}""" == "openjdk11" Compose_Dilemma_Filepath ${JAVA_11_HOME_CENTOS}/bin/java ${JAVA_11_HOME_UBUNTU}/bin/java
183 # Attempt to call plain "java" command directly. If it works, return it.
184 ${out} ${rc} = SSHLibrary.Execute_Command java -version 2>&1 return_rc=True
185 BuiltIn.Return_From_Keyword_If ${rc} == 0 java
186 # Query the virtual machine for the JAVA_HOME environment variable and
187 # use it to assemble a (hopefully) working command. If that worked out,
189 ${java} = SSHLibrary.Execute_Command echo $JAVA_HOME/bin/java 2>&1
190 ${out} ${rc} = SSHLibrary.Execute_Command ${java} -version 2>&1 return_rc=True
191 BuiltIn.Return_From_Keyword_If ${rc} == 0 ${java}
192 # There are bizzare test environment setups where the (correct) JAVA_HOME
193 # is set in the VM where Robot is running but not in the VM where the
194 # tools are supposed to run (usually because these two are really one
195 # and the same system and idiosyncracies of BASH prevent easy injection
196 # of the JAVA_HOME environment variable into a place where connections
197 # made by SSHLibrary would pick it up). So try to use that value to
198 # create a java command and check that it works.
199 ${JAVA_HOME} = OperatingSystem.Get_Environment_Variable JAVA_HOME ${EMPTY}
200 ${java} = BuiltIn.Set_Variable_If """${JAVA_HOME}"""!="" ${JAVA_HOME}/bin/java false
201 ${out} ${rc} = SSHLibrary.Execute_Command ${java} -version 2>&1 return_rc=True
202 BuiltIn.Return_From_Keyword_If ${rc} == 0 ${java}
203 # Nothing works, most likely java is not installed at all on the target
204 # machine or it is hopelesly lost. Bail out with a helpful message
205 # telling the user how to make it accessible for the script.
206 BuiltIn.Fail Unable to find Java; specify \${JDKVERSION}, put it to your PATH or set JAVA_HOME environment variable.
208 Compose_Full_Java_Command
209 [Arguments] ${options} ${openjdk}=${JDKVERSION}
210 [Documentation] Return full Bash command to run Java with given options.
211 ... This requires that the SSH connection on which the command is going to be used is active as it is needed for querying files.
212 ... The options may include JVM options, application command line arguments, Bash redirects and other constructs.
213 ${base_command} = Compose_Base_Java_Command openjdk=${openjdk}
214 ${full_command} = BuiltIn.Set_Variable ${base_command} ${options}
215 BuiltIn.Log ${full_command}
216 [Return] ${full_command}
219 [Arguments] ${openjdk}=${JDKVERSION}
220 [Documentation] Compose base java command and strip trailing "/bin/java".
221 ${java_command} = Compose_Base_Java_Command
222 ${java_home} ${bin} ${java} = String.Split_String_From_Right ${java_command} separator=/ max_split=2
223 [Return] ${java_home}
226 [Arguments] ${maven_version}=3.3.9 ${openjdk}=${JDKVERSION}
227 [Documentation] Download and unpack Maven, prepare launch command with proper Java version and download settings file.
228 ... This Keyword requires an active SSH connection to target machine.
229 ... This Keyword sets global variables, so that suites can reuse existing installation.
230 ... This Keyword can only place Maven (and settings) to remote current working directory.
231 ... This Keyword does not perform any initial or final cleanup.
232 # Avoid multiple initialization by several downstream libraries.
233 ${installed_version} = BuiltIn.Get_Variable_Value \${Maven__installed_version} None
234 BuiltIn.Return_From_Keyword_If """${installed_version}""" == """${maven_version}"""
235 BuiltIn.Set_Global_Variable \${Maven__installed_version} ${maven_version}
236 BuiltIn.Set_Global_Variable \${maven_directory} apache-maven-${maven_version}
237 SSHKeywords.Execute_Command_At_Cwd_Should_Pass rm -rf '${maven_directory}'
238 ${maven_archive_filename} = BuiltIn.Set_Variable ${maven_directory}-bin.tar.gz
239 ${maven_download_url} = BuiltIn.Set_Variable http://www-us.apache.org/dist/maven/maven-3/${maven_version}/binaries/${maven_archive_filename}
240 SSHKeywords.Execute_Command_At_Cwd_Should_Pass wget -N '${maven_download_url}' stderr_must_be_empty=False
241 SSHKeywords.Execute_Command_At_Cwd_Should_Pass tar xvf '${maven_archive_filename}'
242 ${java_home} = NexusKeywords.Compose_Java_Home openjdk=${openjdk}
243 BuiltIn.Set_Global_Variable \${maven_bash_command} export JAVA_HOME='${java_home}' && export MAVEN_OPTS='${JAVA_OPTIONS}' && ./${maven_directory}/bin/mvn
244 # TODO: Get settings files from Jenkins settings provider, somehow.
245 SSHKeywords.Execute_Command_At_Cwd_Should_Pass wget '${MAVEN_SETTINGS_URL}' -O settings.xml stderr_must_be_empty=False
248 [Arguments] ${maven_version}=3.3.9 ${openjdk}=${JDKVERSION} ${branch}=${EMPTY} ${patches}=${EMPTY}
249 [Documentation] Install Maven.
250 ... Depending on arguments, perform a multipatch build to populate local Maven repository with patched artifacts.
251 Install_Maven_Bare maven_version=${maven_version} openjdk=${openjdk}
252 BuiltIn.Return_From_Keyword_If """${patches}""" == "" No post-install build requested.
253 BuiltIn.Run_Keyword_If """${branch}""" == "" BuiltIn.Fail BRANCH needs to be specified for multipatch builds.
254 ${script_name} = BuiltIn.Set_Variable include-raw-integration-multipatch-distribution-test.sh
255 ${script_url} = BuiltIn.Set_Variable https://raw.githubusercontent.com/opendaylight/releng-builder/master/jjb/integration/${script_name}
256 SSHKeywords.Execute_Command_At_Cwd_Should_Pass wget -N '${script_url}' stderr_must_be_empty=False
257 SSHKeywords.Execute_Command_At_Cwd_Should_Pass export WORKSPACE='${WORKSPACE}' && export BRANCH='${branch}' && export PATCHES_TO_BUILD='${patches}' && bash '${script_name}' stderr_must_be_empty=False
258 Run_Maven pom_file=${WORKSPACE}/patch_tester/pom.xml
261 [Arguments] ${pom_file}=pom.xml ${log_file}=${MAVEN_DEFAULT_OUTPUT_FILENAME}
262 [Documentation] Determine arguments to use and call mvn command against given pom file.
263 SSHKeywords.Execute_Command_At_Cwd_Should_Pass mkdir -p '${MAVEN_REPOSITORY_PATH}'
264 ${maven_repository_options} = BuiltIn.Set_Variable -Dmaven.repo.local=${MAVEN_REPOSITORY_PATH} -Dorg.ops4j.pax.url.mvn.localRepository=${MAVEN_REPOSITORY_PATH}
265 SSHKeywords.Execute_Command_At_Cwd_Should_Pass ${maven_bash_command} clean install dependency:tree -V -B -DoutputFile=dependency_tree.log -s './settings.xml' -f '${pom_file}' ${MAVEN_OPTIONS} ${maven_repository_options} > '${log_file}'
267 Get_ODL_Versions_From_Nexus
268 [Documentation] Returns name of last release found on nexus and list of all versions.
269 RequestsLibrary.Create_Session nexus ${NEXUS_RELEASES_URL} verify=${TRUE}
270 ${uri}= BuiltIn.Set_Variable maven-metadata.xml
271 ${response}= RequestsLibrary.Get_Request nexus ${uri}
272 BuiltIn.Log ${response.text}
273 ${root}= XML.Parse_XML ${response.text}
274 ${element}= XML.Get_Element ${root} versioning/latest
275 ${latest}= BuiltIn.Set_Variable ${element.text}
276 BuiltIn.Log ${latest}
277 @{elements}= XML.Get_Elements ${root} .//version
278 ${versions}= BuiltIn.Create_List
279 FOR ${element} IN @{elements}
280 Collections.Append_To_List ${versions} ${element.text}
282 Collections.Sort_List ${versions}
283 BuiltIn.Log_Many @{versions}
284 [Return] ${latest} @{versions}
286 Get_Latest_ODL_Release_From_Nexus
287 [Documentation] Returns name of last release found on nexus
288 ${latest} @{versions}= Get_ODL_Versions_From_Nexus
291 Get_Latest_ODL_Stream_Release
292 [Arguments] ${stream}=latest
293 [Documentation] Returns name for last release for specified stream.
294 ${latest} @{versions}= Get_ODL_Versions_From_Nexus
295 BuiltIn.Return_From_Keyword_If '${stream}'=='latest' ${latest}
296 ${latest_version}= BuiltIn.Set_Variable xxx
297 FOR ${version} IN @{versions}
298 ${latest_version}= BuiltIn.Set_Variable_If '${stream}'.title() in '${version}' ${version} ${latest_version}
300 BuiltIn.Run_Keyword_If '${latest_version}'=='xxx' BuiltIn.Fail Could not find latest release for stream ${stream}
301 BuiltIn.Log ${latest_version}
302 [Return] ${latest_version}
304 Get_Latest_ODL_Stream_Release_URL
305 [Arguments] ${stream}=latest ${format}=.zip
306 [Documentation] Returns URL for last release for specified stream. Default format is .zip.
307 ${latest_version}= Get_Latest_ODL_Stream_Release ${stream}
308 ${url}= BuiltIn.Set_Variable ${NEXUS_RELEASES_URL}/${latest_version}/opendaylight-${latest_version}${format}
312 Get_Latest_ODL_Previous_Stream_Release
313 [Arguments] ${stream}=${ODL_STREAM}
314 [Documentation] Returns name for last release for previous stream of specified stream.
315 ... Note: If specified stream is not found on nexus, then it is taken as new one (not released yet).
316 ... So in this case, latest release version is return.
318 ... NOTE: the below logic is stripping the initial 0. values from the 0.x.x version string that is
319 ... the current (and future) version numbering scheme. There is always a leading 0. to the version
320 ... strings and stripping it makes is easier to do int comparison to find the largest version in the
321 ... list. Comparing as strings does not work. There are some python libs like distutils.version
322 ... or packaging that can do a better job comparing versions, but since ODL version numbering is simple
323 ... at this point, this convention will suffice. The leading 0. will be added back after the the latest
324 ... version is found from the list. The CompareStream.robot library keeps a mapping of major version
325 ... numbers to the global variable ${ODL_STREAM} so that is used to ensure we get a major version that is
326 ... older than the current running major version.
327 ${latest} @{versions}= Get_ODL_Versions_From_Nexus
328 ${current_version}= BuiltIn.Set_Variable ${Stream_dict}[${ODL_STREAM}].0
329 ${latest_version}= BuiltIn.Set_Variable 0.0
330 FOR ${version} IN @{versions}
331 ${version} = String.Replace String Using Regexp ${version} ^0\. ${EMPTY}
332 ${latest_version}= Set Variable If ${version} > ${latest_version} and ${version} < ${current_version} ${version} ${latest_version}
334 ${latest_version}= Set Variable 0.${latest_version}
335 BuiltIn.Run_Keyword_If '${latest_version}'=='0.0.0' BuiltIn.Fail Could not find latest previous release for stream ${stream}
336 BuiltIn.Log ${latest_version}
337 [Return] ${latest_version}
339 Get_Latest_ODL_Previous_Stream_Release_URL
340 [Arguments] ${stream}=${ODL_STREAM} ${format}=.zip
341 [Documentation] Returns URL for last release for previous stream of specified stream. Default format is .zip.
342 ${latest_version}= Get_Latest_ODL_Previous_Stream_Release ${stream}
343 ${url}= BuiltIn.Set_Variable ${NEXUS_RELEASES_URL}/${latest_version}/opendaylight-${latest_version}${format}