Unsatisfiable requirements detected on Julia 1.0

[rikhuijzer]

I'm trying to fix a breaking CI for Julia 1.0 at Gadfly (GiovineItalia/Gadfly.jl#1496). So far, it is quite a mess, but I think I now have pinned it down to the following:

ERROR: Unsatisfiable requirements detected for package Cairo [159f3aea]:
   Cairo [159f3aea] log:
   ├─possible versions are: [0.5.3-0.5.6, 0.6.0, 0.7.0, 0.8.0, 1.0.0-1.0.5] or uninstalled
   ├─restricted to versions [0.7.0-0.7, 0.8.0-0.8, 1.0.0-1] by an explicit requirement, leaving only versions [0.7.0, 0.8.0, 1.  0.0-1.0.5]
   ├─restricted by julia compatibility requirements to versions: [0.5.3-0.5.6, 0.6.0, 0.7.0, 0.8.0] or uninstalled, leaving onl  y versions: [0.7.0, 0.8.0]
   └─restricted by compatibility requirements with Colors [5ae59095] to versions: 1.0.3-1.0.5 or uninstalled — no versions left
     └─Colors [5ae59095] log:
       ├─possible versions are: [0.9.0, 0.9.2-0.9.6, 0.10.0-0.10.2, 0.11.0-0.11.2, 0.12.0-0.12.4] or uninstalled
       ├─restricted to versions [0.9.0-0.9, 0.10.0-0.10, 0.11.0-0.11, 0.12.0-0.12] by Gadfly [c91e804a], leaving only versions   [0.9.0, 0.9.2-0.9.6, 0.10.0-0.10.2, 0.11.0-0.11.2, 0.12.0-0.12.4]
       │ └─Gadfly [c91e804a] log:
       │   ├─possible versions are: 1.3.1 or uninstalled
       │   └─Gadfly [c91e804a] is fixed to version 1.3.1
       └─restricted to versions 0.12.4 by an explicit requirement, leaving only versions 0.12.4

Which shows that Cairo is restricted to at most 0.8. However, I don't see how it is linked to Colors at https://github.com/JuliaGraphics/Cairo.jl/blob/v0.8.0/Project.toml.

[johnnychen94]

Which shows that Cairo is restricted to at most 0.8. However, I don't see how it is linked to Colors at https://github.com/JuliaGraphics/Cairo.jl/blob/v0.8.0/Project.toml.

You need to either:

• update General/Cairo registry. It was set to the latest available Colors version because the Project.toml file in [email protected] doesn't set a upper bound for Colors.
• make a v0.8 branch for Cairo, updates the compatibility, and tag [email protected]

There's nothing we could do here in Colors because it's [email protected] that gets outdated.

Or just set julia compat for Gadfly to 1.3... Since Cairo for Julia <1.3 is really troublesome and doesn't worth maintaining... After all, I believe people will quickly upgrade to Julia 1.6, the next LTS release.

[rikhuijzer]

Aha, so that is it! Many thanks

That’s what I also proposed, but since I‘m not the maintainer its not my decision to make. Upside is that it is interesting to learn how that package manager handles versions