[bug] No such file or directory when porting a project from windows to linux.

[sanzoghenzo]

Problem

NOTE: I've previously opened an issue on meshroom repo, but then I found this is an AliceVision bug.

If I move a meshroom project from windows to linux and then try to run aliceVision_prepareDenseScene, the program throws an error. Here is the log from meshroom:

Program called with the following parameters:
 * evCorrection = 0
 * input = "/home/sanzo/Documents/RifugioAntiaereo/MeshroomCache/StructureFromMotion/8b1eb208dabd66f6b8217585101d147bc86f12b1/sfm.abc"
 * output = "/home/sanzo/Documents/RifugioAntiaereo/MeshroomCache/PrepareDenseScene/d7b6378f935b072434ba6022e5180768b280caf5"
 * outputFileType = "exr"
 * rangeSize = 40
 * rangeStart = 0
 * saveMatricesTxtFiles = 0
 * saveMetadata = 1
 * verboseLevel = "info"

terminate called after throwing an instance of 'boost::filesystem::filesystem_error'
  what():  boost::filesystem::canonical: No such file or directory: "/home/sanzo/Documents/RifugioAntiaereo/MeshroomCache/StructureFromMotion/8b1eb208dabd66f6b8217585101d147bc86f12b1/..\..\FeatureExtraction\41b423ea1e1291f89ca3ee8715f74deb3c81885a"
Aborted

The relative path for FeatureExtraction is stored in the binary file sfm.abc.

I traced the line of code that raises the error, an I suspect that folders.at(i) at the first argument should be changed to fs::path(folders.at(i)) in order to parse it correctly before appending it to the base path.

Expected behavior:
Paths should be parsed correctly

Actual behavior:
base path and relative path are not parsed prior to the contatenation.

Steps to Reproduce

NOTE: I did this in meshroom, so I can't give you the exact steps. Anyway:

1. run a workflow that includes surfaceFromMotion on windows
2. move the files to linux
3. run aliceVision_prepareDenseScene using the files

Versions

• AliceVision branch/version: included in meshroom 2019.2.0 binary
• OS: windows 10 to elementary OS (ubuntu based)

[fabiencastan]

Yes, we should check if the path exist before calling the canonical function.

[github-actions]

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