sourceProcessWithStreams crashes if process closes input stream

[janvogt]

Running vips on a .bmp file via Data.Conduit.Process.sourceProcessWithStreams
fails incorrect ResourceVanish IO exception.

I've created a minimal reproduction that exposes this interaction.

Running ./repro.sh within the provided environment fails with

Repro.hs: sample1.bmp: withBinaryFile: resource vanished (Broken pipe)

despite the file clearly existing.

Also it has to be the interaction, of these three aspects. Every aspect on its own works as shown as well in the repro:

• sourceProcessWithStreams works with cat on .bmp and all other files tested
• sourceProcessWithStreams works with vips on .heic and all files that are not .bmp
• vips on the command line works with .bmp and all other files tested

Only .bmp files processed with vips using sourceProcessWithStreams fails afaick.

[janvogt]

After more investigation I am sure that this is a bug in conduit-extra. There is nothing special about vips and .bmp files: The bug is always triggered if the process does not read all input and that input is larger than, but not a multiple of Data.ByteString.Lazy.defaultChunkSize.

Updated title and reproduction accordingly.

[janvogt]

I've added a fix prototype in the fix branch of the minimal repro.