Opam removes files too late in the upgrade

[chambart]

When ocp-build 0.1 is installed, installing typerex force the upgrade of ocp-build to 1.99-beta (only a dependency to typerex), but it seems that ocp-build.0.1 is removed after installing typerex. So the bin/ocp-build binary installed by typerex is removed.

[samoht]

Which version of opam are you running ? A bug like this existed in 0.8.3 but it should be fixed in 0.9.1.

[chambart]

opam --version
0.9.2

[samoht]

Hum actually I'm not sure how to fix this properly. Just to be clear, this is the current sequence of event:

• typerex is installed: this installs the ocp-build binary
• ocp-build.0.1 is removed: this removes the ocp-build binary
• the new ocp-build package is installed: this is a virtual package so it doesn't do anything

I guess the right solution is to remove all the packages first, and the install then. Unfortunately, this is not a trivial change in the current way we are processing package actions.

[chambart]

One other solution would be to have a cleaner ocp-build install:

• install typerex only build files and keep them somewhere for future packages to get them
• install ocp-build only copy the ocp-build binary from the directory where typerex was built to bin/ocp-build

Is adding something to ask the building of a package to happen inside the build directory of another reasonable ?