Persist changes between scripts when BuildSourcesEphemeral=true about mkosi HOT 5 CLOSED

@kerneis-anssi Can you explain more about your use case? This would be rather complicated to change.

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My workflow involved pulling build dependencies locally during prepare so that I can avoid network access during build. For instance, in Go I'd use go mod vendor and in Rust cargo vendor.

I have alternative ways to reach the same goal:

• move this step to the sync phase
• move those downloads out of build sources (not all build systems handle this gracefully, but cargo allows out-of-tree vendored dependencies, and go mod download to populate the cache is an alternative to vendoring).

I'm not strongly advocating for you to implement this feature, especially if it's too complex. I think it would be useful to clarify the documentation though.

from mkosi.

@kerneis-anssi Can't you just download these to $BUILDDIR? If it's not configurable then you can bind mount $BUILDDIR to the directory that these commands try to write to. See BuildDirectory= option.

from mkosi.

If the paths to use can be configured via environment variables I would actually be OK with setting those automatically in mkosi.

from mkosi.

Cargo (Rust) allows working from BUILDDIR.

Go is really annoying because it will let you download the vendored dependencies anywhere, but then you need to put them under vendor/ at the root of the package you're trying to build for them to be used. I'll try playing with a bind mount of builddir, thanks for the hint!

If the paths to use can be configured via environment variables I would actually be OK with setting those automatically in mkosi.

I don't think that would solve my current issue, but I am indeed setting GOPATH, GOCACHE and others to somewhere inside BuildDirectory. I'll think about whether it makes sense to upstream those and let you know in a separate issue.

Leaving this open as a reminder to update the doc if you agree (I'll let you close as you see fit).

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