Get mega-melt working on CI

[ctrueden]

For a brief time, I enabled bin/tests.sh (i.e. the "mega-melt") on Travis CI. Unfortunately, there were problems.

Here is an example Travis build (build 467):

Relevant portion of the build log

``` Generating mega-melt project... Done! Validating mega-melt project... Done! Generating melting pot... [INFO] Local Maven project: /home/travis/build/scijava/pom-scijava/target/mega-melt [INFO] Determining project dependencies [INFO] Processing project dependencies [INFO] Sholl_Analysis: fetching component source [INFO] jvrpn: fetching component source [WARNING] graphics.scenery:jvrpn:1.1.0: improper scm tag value; scanning remote tags... tests/../target/mega-melt/melting-pot.sh: 428: local: v1.0.0^{}: bad variable name [ERROR] Could not fetch project source for graphics.scenery:jvrpn:1.1.0 [INFO] spirvcrossj: fetching component source [WARNING] graphics.scenery:spirvcrossj:0.6.0-1.1.106.0: improper scm tag value; scanning remote tags... tests/../target/mega-melt/melting-pot.sh: 428: local: spirvcrossj-0.2.0^{}: bad variable name [ERROR] Could not fetch project source for graphics.scenery:spirvcrossj:0.6.0-1.1.106.0 [INFO] scifio-bf-compat: fetching component source [INFO] scifio-cli: fetching component source [INFO] scifio-hdf5: fetching component source [INFO] scifio-jai-imageio: fetching component source [INFO] scifio: fetching component source [INFO] scifio-lifesci: fetching component source [INFO] scifio-ome-xml: fetching component source [INFO] jitk-tps: fetching component source [INFO] mpicbg_: fetching component source [INFO] mpicbg: fetching component source [INFO] ij1-patcher: fetching component source [INFO] ij: fetching component source [WARNING] net.imagej:ij:1.52p: improper scm tag value; scanning remote tags... tests/../target/mega-melt/melting-pot.sh: 428: local: v1.38u: bad variable name [ERROR] Could not fetch project source for net.imagej:ij:1.52p [INFO] imagej-common: fetching component source [INFO] imagej-deprecated: fetching component source [INFO] imagej: fetching component source [INFO] imagej-launcher: fetching component source [INFO] imagej-legacy: fetching component source [INFO] imagej-matlab: fetching component source [INFO] imagej-mesh-io: fetching component source [INFO] imagej-mesh: fetching component source [INFO] imagej-notebook: fetching component source [INFO] imagej-opencv: fetching component source [INFO] imagej-ops: fetching component source [INFO] imagej-plugins-batch: fetching component source [INFO] imagej-plugins-commands: fetching component source [INFO] imagej-plugins-tools: fetching component source [INFO] imagej-plugins-uploader-ssh: fetching component source [INFO] imagej-plugins-uploader-webdav: fetching component source [INFO] imagej-scripting: fetching component source [INFO] imagej-tensorflow: fetching component source [INFO] imagej-ui-awt: fetching component source [INFO] imagej-ui-swing: fetching component source [INFO] imagej-updater: fetching component source [INFO] op-finder: fetching component source [INFO] imglib2-algorithm-fft: fetching component source [INFO] imglib2-algorithm-gpl: fetching component source [INFO] imglib2-algorithm: fetching component source [INFO] imglib2-cache: fetching component source [INFO] imglib2-ij: fetching component source [INFO] imglib2: fetching component source [INFO] imglib2-label-multisets: fetching component source [WARNING] net.imglib2:imglib2-label-multisets:0.9.0: improper scm tag value; scanning remote tags... tests/../target/mega-melt/melting-pot.sh: 428: local: 0.1.0^{}: bad variable name [ERROR] Could not fetch project source for net.imglib2:imglib2-label-multisets:0.9.0 [INFO] imglib2-realtransform: fetching component source [INFO] imglib2-roi: fetching component source [INFO] imglib2-script: fetching component source [INFO] imglib2-ui: fetching component source [INFO] imglib2-unsafe: fetching component source [INFO] BigStitcher: fetching component source [INFO] multiview-reconstruction: fetching component source [INFO] multiview-simulation: fetching component source [INFO] bonej-legacy-plugins_: fetching component source [INFO] bonej-legacy-util_: fetching component source [INFO] bonej-ops: fetching component source [INFO] bonej-plugins: fetching component source [INFO] bonej-utilities: fetching component source [INFO] H5J_Loader_Plugin: fetching component source [INFO] n5-aws-s3: fetching component source [INFO] n5-google-cloud: fetching component source [INFO] n5-hdf5: fetching component source [INFO] n5-imglib2: fetching component source [INFO] n5: fetching component source [INFO] n5-viewer_fiji: fetching component source [WARNING] org.janelia.saalfeldlab:n5-viewer_fiji:2.2.0: improper scm tag value; scanning remote tags... tests/../target/mega-melt/melting-pot.sh: 428: local: 1.1.0: bad variable name [ERROR] Could not fetch project source for org.janelia.saalfeldlab:n5-viewer_fiji:2.2.0 [INFO] batch-processor: fetching component source [INFO] minimaven: fetching component source [INFO] native-lib-loader: fetching component source [INFO] parsington: fetching component source [INFO] scijava-cache: fetching component source [INFO] scijava-common: fetching component source [INFO] scijava-config: fetching component source [INFO] scijava-grab: fetching component source [INFO] scijava-io-http: fetching component source [INFO] scijava-java3d: fetching component source [INFO] scijava-listeners: fetching component source [INFO] scijava-log-slf4j: fetching component source [INFO] scijava-optional: fetching component source [INFO] scijava-plugins-commands: fetching component source [INFO] scijava-plugins-io-table: fetching component source [INFO] scijava-plugins-platforms: fetching component source [INFO] scijava-plugins-text-markdown: fetching component source [INFO] scijava-plugins-text-plain: fetching component source [INFO] scijava-search: fetching component source [INFO] scijava-table: fetching component source [INFO] scijava-ui-awt: fetching component source [INFO] scijava-ui-swing: fetching component source [INFO] script-editor: fetching component source [INFO] scripting-beanshell: fetching component source [INFO] scripting-clojure: fetching component source [INFO] scripting-groovy: fetching component source [INFO] scripting-java: fetching component source [INFO] scripting-javascript: fetching component source [INFO] scripting-jruby: fetching component source [INFO] scripting-jython: fetching component source [INFO] scripting-kotlin: fetching component source [INFO] scripting-matlab: fetching component source [INFO] scripting-renjin: fetching component source [INFO] scripting-scala: fetching component source [INFO] swing-checkbox-tree: fetching component source [INFO] ui-behaviour: fetching component source [INFO] 3D_Blob_Segmentation: fetching component source [INFO] 3D_Objects_Counter: fetching component source [INFO] 3D_Viewer: fetching component source [INFO] AnalyzeSkeleton_: fetching component source [INFO] Anisotropic_Diffusion_2D: fetching component source [INFO] Archipelago_Plugins: fetching component source [INFO] Arrow_: fetching component source [INFO] Auto_Local_Threshold: fetching component source [INFO] Auto_Threshold: fetching component source [INFO] BalloonSegmentation_: fetching component source [INFO] bigdataviewer-core: fetching component source [INFO] bigdataviewer_fiji: fetching component source [INFO] bigdataviewer-server: fetching component source [INFO] bigdataviewer-vistools: fetching component source [INFO] bigvolumeviewer: fetching component source [INFO] bigwarp_fiji: fetching component source [INFO] bij: fetching component source [INFO] blockmatching_: fetching component source [INFO] Bug_Submitter: fetching component source [INFO] bUnwarpJ_: fetching component source [INFO] Calculator_Plus: fetching component source [INFO] Cell_Counter: fetching component source [INFO] Colocalisation_Analysis: fetching component source [INFO] Color_Histogram: fetching component source [INFO] Color_Inspector_3D: fetching component source [WARNING] sc.fiji:Color_Inspector_3D:2.5.0: improper scm tag value; scanning remote tags... tests/../target/mega-melt/melting-pot.sh: 428: local: Color_Inspector_3D-2.3.1^{}: bad variable name [ERROR] Could not fetch project source for sc.fiji:Color_Inspector_3D:2.5.0 [INFO] Colour_Deconvolution: fetching component source [INFO] Correct_3D_Drift: fetching component source [INFO] CorrectBleach_: fetching component source [INFO] CPU_Meter: fetching component source [INFO] Descriptor_based_registration: fetching component source [INFO] Dichromacy_: fetching component source [INFO] Directionality_: fetching component source [INFO] Feature_Detection: fetching component source [INFO] Fiji_Archipelago: fetching component source [INFO] Fiji_Developer: fetching component source [INFO] fiji: fetching component source [INFO] fiji-lib: fetching component source [INFO] Fiji_Package_Maker: fetching component source [INFO] Fiji_Plugins: fetching component source [INFO] FlowJ_: fetching component source [INFO] FS_Align_TrakEM2: fetching component source [INFO] Graph_Cut: fetching component source [INFO] Gray_Morphology: fetching component source [INFO] HDF5_Vibez: fetching component source [INFO] Helmholtz_Analysis: fetching component source [INFO] IJ_Robot: fetching component source [INFO] Image_5D: fetching component source [INFO] Image_Expression_Parser: fetching component source [INFO] Interactive_3D_Surface_Plot: fetching component source [INFO] IO_: fetching component source [INFO] IsoData_Classifier: fetching component source [INFO] Kuwahara_Filter: fetching component source [INFO] KymographBuilder: fetching component source [INFO] Lasso_and_Blow_Tool: fetching component source [INFO] legacy-imglib1: fetching component source [INFO] level_sets: fetching component source [INFO] Linear_Kuwahara: fetching component source [INFO] LocalThickness_: fetching component source [INFO] LSM_Reader: fetching component source [INFO] LSM_Toolbox: fetching component source [INFO] Manual_Tracking: fetching component source [INFO] M_I_P: fetching component source [INFO] MTrack2_: fetching component source [INFO] Multi_Kymograph: fetching component source [INFO] OMEVisual: fetching component source [INFO] pal-optimization: fetching component source [INFO] panorama_: fetching component source [INFO] PIV_analyser: fetching component source [INFO] QuickPALM_: fetching component source [INFO] RATS_: fetching component source [INFO] Reconstruct_Reader: fetching component source [INFO] register_virtual_stack_slices: fetching component source [INFO] registration_3d: fetching component source [INFO] Samples_: fetching component source [INFO] Series_Labeler: fetching component source [INFO] Simple_Neurite_Tracer: fetching component source [INFO] Siox_Segmentation: fetching component source [INFO] Skeletonize3D_: fetching component source [INFO] spim_data: fetching component source [INFO] SPIM_Opener: fetching component source [INFO] SPIM_Registration: fetching component source [INFO] SplineDeformationGenerator_: fetching component source [INFO] Stack_Manipulation: fetching component source [INFO] Statistical_Region_Merging: fetching component source [INFO] Stitching_: fetching component source [INFO] Sync_Win: fetching component source [INFO] T2-NIT: fetching component source [INFO] T2-TreelineGraph: fetching component source [INFO] Thread_Killer: fetching component source [INFO] Time_Lapse: fetching component source [INFO] Time_Stamper: fetching component source [INFO] ToAST_: fetching component source [INFO] TopoJ_: fetching component source [INFO] TrackMate_: fetching component source [INFO] Trainable_Segmentation: fetching component source [WARNING] sc.fiji:Trainable_Segmentation:3.2.34: improper scm tag value; scanning remote tags... tests/../target/mega-melt/melting-pot.sh: 428: local: Trainable_Segmentation-2.1.1: bad variable name [ERROR] Could not fetch project source for sc.fiji:Trainable_Segmentation:3.2.34 [INFO] TrakEM2_Archipelago: fetching component source [INFO] TrakEM2_: fetching component source [INFO] trakem2_tps: fetching component source [INFO] trakem2-transform: fetching component source [INFO] Vaa3d_Reader: fetching component source [INFO] Vaa3d_Writer: fetching component source [INFO] VectorString: fetching component source [INFO] VIB_: fetching component source [INFO] VIB-lib: fetching component source [INFO] Video_Editing: fetching component source [INFO] View5D_: fetching component source [INFO] Volume_Calculator: fetching component source [INFO] Volume_Viewer: fetching component source [INFO] weave_jy2java: fetching component source [INFO] z_spacing: fetching component source [INFO] sciview: fetching component source [INFO] Processing changed components [INFO] Generating build scripts [INFO] Skipping the build; run melt.sh to do it. [INFO] Melt complete: /home/travis/build/scijava/pom-scijava/target/mega-melt Adjusting melting pot build script... Done! Melting the pot... [SUCCESS] LOCAL/PROJECT [SUCCESS] ca.mcgill/Sholl_Analysis [1 minutes elapsed] [SUCCESS] io.scif/scifio [SUCCESS] io.scif/scifio-bf-compat [SUCCESS] io.scif/scifio-cli [SUCCESS] io.scif/scifio-hdf5 [2 minutes elapsed] [SUCCESS] io.scif/scifio-jai-imageio [SUCCESS] io.scif/scifio-lifesci [SUCCESS] io.scif/scifio-ome-xml [SUCCESS] jitk/jitk-tps [SUCCESS] mpicbg/mpicbg/mpicbg [SUCCESS] mpicbg/mpicbg_/mpicbg_ [3 minutes elapsed] [SUCCESS] net.imagej/ij1-patcher [SUCCESS] net.imagej/imagej [4 minutes elapsed] [SUCCESS] net.imagej/imagej-common [SUCCESS] net.imagej/imagej-deprecated [SUCCESS] net.imagej/imagej-launcher [SUCCESS] net.imagej/imagej-legacy [SUCCESS] net.imagej/imagej-matlab [5 minutes elapsed] [SUCCESS] net.imagej/imagej-mesh [SUCCESS] net.imagej/imagej-mesh-io [SUCCESS] net.imagej/imagej-notebook [SUCCESS] net.imagej/imagej-opencv [6 minutes elapsed] [7 minutes elapsed] [8 minutes elapsed] [9 minutes elapsed] [10 minutes elapsed] [11 minutes elapsed] [SUCCESS] net.imagej/imagej-ops [SUCCESS] net.imagej/imagej-plugins-batch [SUCCESS] net.imagej/imagej-plugins-commands [SUCCESS] net.imagej/imagej-plugins-tools [12 minutes elapsed] [SUCCESS] net.imagej/imagej-plugins-uploader-ssh [SUCCESS] net.imagej/imagej-plugins-uploader-webdav [SUCCESS] net.imagej/imagej-scripting [13 minutes elapsed] [SUCCESS] net.imagej/imagej-tensorflow [SUCCESS] net.imagej/imagej-ui-awt [FAILURE] net.imagej/imagej-ui-swing [SUCCESS] net.imagej/imagej-updater [SUCCESS] net.imagej/op-finder [14 minutes elapsed] [SUCCESS] net.imglib2/imglib2 [SUCCESS] net.imglib2/imglib2-algorithm [15 minutes elapsed] [SUCCESS] net.imglib2/imglib2-algorithm-fft [SUCCESS] net.imglib2/imglib2-algorithm-gpl [SUCCESS] net.imglib2/imglib2-cache [16 minutes elapsed] [SUCCESS] net.imglib2/imglib2-ij [SUCCESS] net.imglib2/imglib2-realtransform [SUCCESS] net.imglib2/imglib2-roi [17 minutes elapsed] [SUCCESS] net.imglib2/imglib2-script [SUCCESS] net.imglib2/imglib2-ui [SUCCESS] net.imglib2/imglib2-unsafe [SUCCESS] net.preibisch/BigStitcher [FAILURE] net.preibisch/multiview-reconstruction [SUCCESS] net.preibisch/multiview-simulation [18 minutes elapsed] [SUCCESS] org.janelia.saalfeldlab/n5 [SUCCESS] org.janelia.saalfeldlab/n5-aws-s3 [SUCCESS] org.janelia.saalfeldlab/n5-google-cloud [19 minutes elapsed] [SUCCESS] org.janelia.saalfeldlab/n5-hdf5 [SUCCESS] org.janelia.saalfeldlab/n5-imglib2 [SUCCESS] org.janelia/H5J_Loader_Plugin [SUCCESS] org.scijava/batch-processor [SUCCESS] org.scijava/minimaven [SUCCESS] org.scijava/native-lib-loader [SUCCESS] org.scijava/parsington [SUCCESS] org.scijava/scijava-cache [20 minutes elapsed] [SUCCESS] org.scijava/scijava-common [SUCCESS] org.scijava/scijava-config [SUCCESS] org.scijava/scijava-grab [SUCCESS] org.scijava/scijava-io-http [SUCCESS] org.scijava/scijava-java3d [SUCCESS] org.scijava/scijava-listeners [SUCCESS] org.scijava/scijava-log-slf4j [21 minutes elapsed] [SUCCESS] org.scijava/scijava-optional [SUCCESS] org.scijava/scijava-plugins-commands [SUCCESS] org.scijava/scijava-plugins-io-table [SUCCESS] org.scijava/scijava-plugins-platforms [SUCCESS] org.scijava/scijava-plugins-text-markdown [SUCCESS] org.scijava/scijava-plugins-text-plain [SUCCESS] org.scijava/scijava-search [SUCCESS] org.scijava/scijava-table [SUCCESS] org.scijava/scijava-ui-awt [22 minutes elapsed] [SUCCESS] org.scijava/scijava-ui-swing [SUCCESS] org.scijava/script-editor [SUCCESS] org.scijava/scripting-beanshell [SUCCESS] org.scijava/scripting-clojure [SUCCESS] org.scijava/scripting-groovy [SUCCESS] org.scijava/scripting-java [SUCCESS] org.scijava/scripting-javascript [23 minutes elapsed] [SUCCESS] org.scijava/scripting-jruby [SUCCESS] org.scijava/scripting-jython [SUCCESS] org.scijava/scripting-kotlin [SUCCESS] org.scijava/scripting-matlab [SUCCESS] org.scijava/scripting-renjin [24 minutes elapsed] [SUCCESS] org.scijava/scripting-scala [SUCCESS] org.scijava/swing-checkbox-tree [SUCCESS] org.scijava/ui-behaviour [SUCCESS] sc.fiji/3D_Blob_Segmentation [SUCCESS] sc.fiji/3D_Objects_Counter [SUCCESS] sc.fiji/3D_Viewer [SUCCESS] sc.fiji/AnalyzeSkeleton_ [SUCCESS] sc.fiji/Anisotropic_Diffusion_2D [25 minutes elapsed] [SUCCESS] sc.fiji/Archipelago_Plugins [SUCCESS] sc.fiji/Arrow_ [SUCCESS] sc.fiji/Auto_Local_Threshold [SUCCESS] sc.fiji/Auto_Threshold [SUCCESS] sc.fiji/BalloonSegmentation_ [SUCCESS] sc.fiji/Bug_Submitter [SUCCESS] sc.fiji/CPU_Meter [SUCCESS] sc.fiji/Calculator_Plus [SUCCESS] sc.fiji/Cell_Counter [26 minutes elapsed] [SUCCESS] sc.fiji/Colocalisation_Analysis [SUCCESS] sc.fiji/Color_Histogram [SUCCESS] sc.fiji/Colour_Deconvolution [SUCCESS] sc.fiji/CorrectBleach_ [SUCCESS] sc.fiji/Correct_3D_Drift [SUCCESS] sc.fiji/Descriptor_based_registration [SUCCESS] sc.fiji/Dichromacy_ [SUCCESS] sc.fiji/Directionality_ [SUCCESS] sc.fiji/FS_Align_TrakEM2 [SUCCESS] sc.fiji/Feature_Detection [27 minutes elapsed] [SUCCESS] sc.fiji/Fiji_Archipelago [SUCCESS] sc.fiji/Fiji_Developer [SUCCESS] sc.fiji/Fiji_Package_Maker [SUCCESS] sc.fiji/Fiji_Plugins [SUCCESS] sc.fiji/FlowJ_ [SUCCESS] sc.fiji/Graph_Cut [SUCCESS] sc.fiji/Gray_Morphology [SUCCESS] sc.fiji/HDF5_Vibez [SUCCESS] sc.fiji/Helmholtz_Analysis [SUCCESS] sc.fiji/IJ_Robot [SUCCESS] sc.fiji/IO_ [28 minutes elapsed] [SUCCESS] sc.fiji/Image_5D [SUCCESS] sc.fiji/Image_Expression_Parser [SUCCESS] sc.fiji/Interactive_3D_Surface_Plot [SUCCESS] sc.fiji/IsoData_Classifier [SUCCESS] sc.fiji/Kuwahara_Filter [SUCCESS] sc.fiji/KymographBuilder [SUCCESS] sc.fiji/LSM_Reader [SUCCESS] sc.fiji/LSM_Toolbox [SUCCESS] sc.fiji/Lasso_and_Blow_Tool [SUCCESS] sc.fiji/Linear_Kuwahara [29 minutes elapsed] [SUCCESS] sc.fiji/LocalThickness_ [SUCCESS] sc.fiji/MTrack2_ [SUCCESS] sc.fiji/M_I_P [SUCCESS] sc.fiji/Manual_Tracking [SUCCESS] sc.fiji/Multi_Kymograph [FAILURE] sc.fiji/OMEVisual [SUCCESS] sc.fiji/PIV_analyser [SUCCESS] sc.fiji/QuickPALM_ [SUCCESS] sc.fiji/RATS_ [SUCCESS] sc.fiji/Reconstruct_Reader [SUCCESS] sc.fiji/SPIM_Opener [30 minutes elapsed] [SUCCESS] sc.fiji/SPIM_Registration [SUCCESS] sc.fiji/Samples_ [SUCCESS] sc.fiji/Series_Labeler [SUCCESS] sc.fiji/Simple_Neurite_Tracer [SUCCESS] sc.fiji/Siox_Segmentation [SUCCESS] sc.fiji/Skeletonize3D_ [SUCCESS] sc.fiji/SplineDeformationGenerator_ [SUCCESS] sc.fiji/Stack_Manipulation [SUCCESS] sc.fiji/Statistical_Region_Merging [31 minutes elapsed] [SUCCESS] sc.fiji/Stitching_ [SUCCESS] sc.fiji/Sync_Win [SUCCESS] sc.fiji/T2-NIT [SUCCESS] sc.fiji/T2-TreelineGraph [SUCCESS] sc.fiji/Thread_Killer [SUCCESS] sc.fiji/Time_Lapse [SUCCESS] sc.fiji/Time_Stamper [SUCCESS] sc.fiji/ToAST_ [SUCCESS] sc.fiji/TopoJ_ [32 minutes elapsed] [SUCCESS] sc.fiji/TrackMate_ [SUCCESS] sc.fiji/TrakEM2_ [SUCCESS] sc.fiji/TrakEM2_Archipelago [SUCCESS] sc.fiji/VIB-lib [SUCCESS] sc.fiji/VIB_ [SUCCESS] sc.fiji/Vaa3d_Reader [SUCCESS] sc.fiji/Vaa3d_Writer [33 minutes elapsed] [SUCCESS] sc.fiji/VectorString [SUCCESS] sc.fiji/Video_Editing [SUCCESS] sc.fiji/View5D_ [SUCCESS] sc.fiji/Volume_Calculator [SUCCESS] sc.fiji/Volume_Viewer [SUCCESS] sc.fiji/bUnwarpJ_ [SUCCESS] sc.fiji/bigdataviewer-core [SUCCESS] sc.fiji/bigdataviewer-server [34 minutes elapsed] [SUCCESS] sc.fiji/bigdataviewer-vistools [SUCCESS] sc.fiji/bigdataviewer_fiji [SUCCESS] sc.fiji/bigvolumeviewer [SUCCESS] sc.fiji/bigwarp_fiji [SUCCESS] sc.fiji/bij [SUCCESS] sc.fiji/blockmatching_ [SUCCESS] sc.fiji/fiji [35 minutes elapsed] [SUCCESS] sc.fiji/fiji-lib [SUCCESS] sc.fiji/legacy-imglib1 [SUCCESS] sc.fiji/level_sets [SUCCESS] sc.fiji/pal-optimization [SUCCESS] sc.fiji/panorama_ [SUCCESS] sc.fiji/register_virtual_stack_slices [SUCCESS] sc.fiji/registration_3d [SUCCESS] sc.fiji/spim_data [SUCCESS] sc.fiji/trakem2-transform [36 minutes elapsed] [SUCCESS] sc.fiji/trakem2_tps [SUCCESS] sc.fiji/weave_jy2java [SUCCESS] sc.fiji/z_spacing [SUCCESS] sc.iview/sciview All checks succeeded! :-D ```

Problems include:

1) The build purports to pass, but the mega-melt identifies multiple failing components. Something wrong with exit codes somewhere, or the script isn't failing fast when a non-zero exit code happens?

2) imagej-ui-swing and multiview-reconstruction fail for reasons unknown (they passed for me locally at the time).

3) OMEVisual fails, probably because OpenJFX8 isn't installed. We need to add it to the .travis.yml, similar to how the OMEVisual project itself does:

before_install:
  - sudo apt-get update
  - sudo apt-get install -y openjfx libopenjfx-java libopenjfx-jni

4) Something in the melting-pot.sh script doesn't play nice on Travis, probably due to dash. The error happens when scanning remote tags as a fallback:

[WARNING] sc.fiji:Trainable_Segmentation:3.2.34: improper scm tag value; scanning remote tags…
melting-pot.sh: 428: local: Trainable_Segmentation-2.1.1: bad variable name
[ERROR] Could not fetch project source for sc.fiji:Trainable_Segmentation:3.2.34

[ctrueden]

This issue is still relevant: we want to get the mega-melt working on GitHub Actions as soon as we can, such that every PR and every push to the main branch gets tested for dependency version harmony. However, the above description is now quite outdated regarding what problems remain to be solved to accomplish that. Here is an update:

• We will create a separate mega-melt workflow, because we need to be able to disable it prior to pushing so-called preemptive version bumps, where: 1) the BOM is updated to reference a not-yet-released version of some components, 2) that BOM is released, 3) those components are updated to extend that BOM, and 4) subsequently released themselves at the aforementioned versions. (This may seem like a circular dependency at first, but it works, while enabling all components of the BOM to achieve version harmony without intermediate non-functional BOM releases. One common use of this technique is to accommodate backwards-incompatible major version bumps that need to propagate downstream to other managed components as a single coordinated BOM increment.)

• GitHub Actions must be configured to cache ~/.cache/scijava/melting-pot whenever it changes. @hinerm has a hack where you use the GitHub Actions API to delete the cache in situations where you know it needs to be regenerated. Hopefully we can incorporate this deletion step whenever the last-modified timestamp of that folder has been updated during the build.

  • One thing I still don't know is whether a GitHub Actions cache can include folders outside of the project working directory. But if not, we could make a cache folder in the CWD and then symlink it to ~/.cache/scijava/melting-pot manually before running the mega-melt, or change the melting-pot.sh script to make the cache directory configurable.

• The melting-pot.sh script needs updating to cache successful builds of particular GAV+dependencies. The plan is to gather the list of that component's dependency GAVs at the mega-melt's pinned versions, including the component GAV itself, then hash that list and see whether it has built successfully in the past—and if so, skip the build of that component as already successful. (Currently, a component build is skipped if the melting pot has a build.log with a BUILD SUCCESS inside, but rebuilding the mega-melt's melting-pot—which the CI build will do every time—loses all such build.log files.)

  • This list of successful hashes must be persisted across mega-melt builds, so we need to either: A) cache it as its own thing; or B) lump it into the ~/.cache/scijava/melting-pot folder so that it also gets cached and restored on each build. We need to analyze whether caching it separately (which is probably slightly more complex than storing it in ~/.cache/scijava/melting-pot) will result in a significant performance gain in practice.

With those three points addressed, I believe we will be able to have a working mega-melt on CI, which will greatly help to catch BOM version clashes quickly.