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| This page documents how to add test data while developing ITK.
| | {{ Historical }} |
| See our [[ITK/Git|table of contents]] for more information.
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| __TOC__
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| = Workflow =
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|
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| Our workflow for adding data integrates with our standard Git [[ITK/Git/Develop|development process]].
| | Up to date information can be found on GitHub: |
| Start by [[ITK/Git/Develop#Create_a_Topic|creating a topic]].
| | https://github.com/InsightSoftwareConsortium/ITK/blob/master/Documentation/Data.md |
| Return here when you reach the "edit files" step.
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| These instructions follow a typical use case of adding a new test with a baseline image.
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| == Add Data ==
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| {| style="width: 100%"
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| |-
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| |width=60%|
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| Copy the data file into your local source tree.
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| |-
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| :<code>$ mkdir -p Modules/.../test/Baseline</code>
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| :<code>$ cp ~/''MyTest.png'' Modules/.../test/Baseline/''MyTest.png''</code>
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| |}
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| == Add Test ==
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| {| style="width: 100%"
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| |-
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| |width=60%|
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| Edit the test CMakeLists.txt file and reference the data file in an <code>itk_add_test</code> call.
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| Specify the file inside <code>DATA{...}</code> using a path relative to the test directory:
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| :<code>$ edit Modules/.../test/CMakeLists.txt</code>
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| :{|
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| itk_add_test(NAME MyTest COMMAND ... --compare DATA{Baseline/''MyTest.png''} ...)
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| |}
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| |align="center"|
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| [http://itk.org/gitweb?p=ITK.git;a=blob;f=CMake/ExternalData.cmake;hb=HEAD <code>ExternalData.cmake</code>]
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| |}
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| == Run CMake ==
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| {| style="width: 100%"
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| |-
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| |width=60%|
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| Run cmake on the build tree:
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| :<code>$ cd ../ITK-build</code>
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| :<code>$ cmake .</code>
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| :''(Or just run "make" to do a full configuration and build.)''
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| :<code>$ cd ../ITK</code>
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| |align="center"|
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| ''CMake will [[#ExternalData|move the original file]]!''
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| |-
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| During configuration CMake will display a message such as:
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| :{| | |
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| Linked Modules/.../test/Baseline/''MyTest.png''.md5 to ExternalData MD5/...
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| |}
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| This means that CMake converted the file into a data object referenced by a "content link".
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| |align="center"|
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| [http://itk.org/gitweb?p=ITK.git;a=blob;f=CMake/ExternalData.cmake;hb=HEAD <code>ExternalData.cmake</code>]
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| |}
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| == Commit ==
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| {| style="width: 100%"
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| |-
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| |width=60%|
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| Continue to [[ITK/Git/Develop#Create_a_Topic|create the topic]] and edit other files as necessary.
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| Add the content link and commit it along with the other changes:
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| :<code>$ git add Modules/.../test/Baseline/''MyTest.png''.md5</code>
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| :<code>$ git add Modules/.../test/CMakeLists.txt</code>
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| :<code>$ git commit</code>
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| |align="center"|
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| [http://www.kernel.org/pub/software/scm/git/docs/git-add.html <code>git help add</code>]
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| <br/>
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| [http://www.kernel.org/pub/software/scm/git/docs/git-commit.html <code>git help commit</code>]
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| |-
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| The local <code>pre-commit</code> hook will display a message such as:
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| :{|
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| Modules/.../test/Baseline/''MyTest.png''.md5: Added content to Git at refs/data/MD5/...
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| Modules/.../test/Baseline/''MyTest.png''.md5: Added content to local store at .ExternalData/MD5/...
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| Content link Modules/.../test/Baseline/''MyTest.png''.md5 -> .ExternalData/MD5/...
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| |}
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| This means that the pre-commit hook recognized that the content link references a new data object and [[#pre-commit|prepared it for upload]].
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| |align="center"|
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| [http://itk.org/gitweb?p=ITK.git;a=blob;f=Utilities/Hooks/pre-commit;hb=HEAD <code>pre-commit</code>]
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| |}
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| == Push ==
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| {| style="width: 100%"
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| |-
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| |width=60%|
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| Follow the instructions to [[ITK/Git/Develop#Share_a_Topic|share the topic]].
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| When you push it to Gerrit for review using
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| :<code>$ git gerrit-push</code>
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| |align="center"|
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| [http://itk.org/gitweb?p=ITK.git;a=blob;f=Utilities/Git/git-gerrit-push;hb=HEAD <code>git-gerrit-push</code>]
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| |-
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| part of the output will be of the form
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| :{|
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| * ...:refs/data/commits/... [new branch]
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| * HEAD:refs/for/master/''my-topic'' [new branch]
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| Pushed refs/data and removed local copy:
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| MD5/...
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| |}
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| This means that the git-gerrit-push script pushed the topic and [[#git-gerrit-push|uploaded the data]] it references.
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| |}
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| = Discussion =
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| An ITK test data file is not stored in the main source tree under version control.
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| Instead the source tree contains a "content link" that refers to a data object by a hash of its content.
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| At build time the the
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| [http://itk.org/gitweb?p=ITK.git;a=blob;f=CMake/ExternalData.cmake;hb=HEAD <code>ExternalData.cmake</code>]
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| module fetches data needed by enabled tests.
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| This allows arbitrarily large data to be added and removed without bloating the version control history.
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| The above [[#Workflow|workflow]] allows developers to add a new data file almost as if committing it to the source tree.
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| The following subsections discuss details of the workflow implementation.
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| == ExternalData ==
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| While [[#Run_CMake|CMake runs]] the
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| [http://itk.org/gitweb?p=ITK.git;a=blob;f=CMake/ExternalData.cmake;hb=HEAD ExternalData]
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| module evaluates [[#Add_Test|DATA{} references]].
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| ITK [http://itk.org/gitweb?p=ITK.git;a=blob;f=CMake/ITKExternalData.cmake;hb=HEAD sets]
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| the <code>ExternalData_LINK_CONTENT</code> option to <code>MD5</code> to enable automatic conversion of raw data files into content links.
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| When the module detects a real data file in the source tree it performs the following transformation as specified in the module documentation:
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| * Compute the MD5 hash of the file
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| * Store the <code>${hash}</code> in a file with the original name plus <code>.md5</code>
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| * Rename the original file to <code>.ExternalData_MD5_${hash}</code>
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| The real data now sit in a file that we [http://itk.org/gitweb?p=ITK.git;a=blob;f=.gitignore;hb=HEAD tell Git to ignore].
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| For example:
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| $ '''cat Modules/.../test/Baseline/.ExternalData_MD5_477e602800c18624d9bc7a32fa706b97 |md5sum'''
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| 477e602800c18624d9bc7a32fa706b97 -
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| $ '''cat Modules/.../test/Baseline/''MyTest.png''.md5'''
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| 477e602800c18624d9bc7a32fa706b97
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| == pre-commit ==
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| While [[#Commit|committing]] a new or modified content link the
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| [http://itk.org/gitweb?p=ITK.git;a=blob;f=Utilities/Hooks/pre-commit;hb=HEAD <code>pre-commit</code>]
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| hook moves the real data object from the <code>.ExternalData_MD5_${hash}</code> file left by the ExternalData module
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| to a local object repository stored in a <code>.ExternalData</code> directory at the top of the source tree.
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| The hook also uses Git plumbing commands to store the data object as a blob in the local Git repository.
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| The blob is not referenced by the new commit but instead by <code>refs/data/MD5/${hash}</code>.
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| This keeps the blob alive in the local repository but does not add it to the project history.
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| For example:
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| $ '''git for-each-ref --format="%(refname)" refs/data'''
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| refs/data/MD5/477e602800c18624d9bc7a32fa706b97
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| $ '''git cat-file blob refs/data/MD5/477e602800c18624d9bc7a32fa706b97 | md5sum'''
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| 477e602800c18624d9bc7a32fa706b97 -
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| == git gerrit-push ==
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| The "<code>git gerrit-push</code>" command is actually an
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| [http://itk.org/gitweb?p=ITK.git;a=blob;f=Utilities/DevelopmentSetupScripts/SetupGitAliases.sh;hb=HEAD alias]
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| for the
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| [http://itk.org/gitweb?p=ITK.git;a=blob;f=Utilities/Git/git-gerrit-push;hb=HEAD <code>Utilities/Git/git-gerrit-push</code>]
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| script.
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| In addition to pushing the topic branch to Gerrit the script also detects content links added or modified by the commits in the topic.
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| It reads the data object hashes from the content links and looks for matching <code>refs/data/</code> entries in the local Git repository.
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| The script pushes the matching data objects to Gerrit inside a temporary commit object disjoint from the rest of history.
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| For example:
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| $ '''git gerrit-push --dry-run --no-topic'''
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| * f59717cfb68a7093010d18b84e8a9a90b6b42c11:refs/data/commits/f59717cfb68a7093010d18b84e8a9a90b6b42c11 [new branch]
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| Pushed refs/data and removed local copy:
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| MD5/477e602800c18624d9bc7a32fa706b97
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| $ '''git ls-tree -r --name-only f59717cf'''
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| MD5/477e602800c18624d9bc7a32fa706b97
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| $ '''git log --oneline f59717cf'''
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| f59717c data
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| A robot runs every few minutes to fetch the objects from Gerrit and upload them to a
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| [http://www.itk.org/files/ExternalData location] that we
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| [http://itk.org/gitweb?p=ITK.git;a=blob;f=CMake/ITKExternalData.cmake;hb=HEAD tell ExternalData to search]
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| at build time.
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