[Webkit-unassigned] [Bug 221711] New: [Flatpak SDK] Support multiple builds running at the same time

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=221711

            Bug ID: 221711
           Summary: [Flatpak SDK] Support multiple builds running at the
                    same time
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: lmoura at igalia.com

As part of Flatpak 1.10 changes regarding environment variables, the Flatpak SDK currently creates a `WebKitBuild/flatpak-env.json` variable to pass the needed environment variables to the webkit-bwrap wrapper. One such variable is  WEBKIT_BUILD_DIR_BIND_MOUNT, which is used to bindmount the WebKitBuild/<PORT>/<CONFIG> directory into WebKitBuild/<CONFIG> inside the sanbox.

While this has been working quite well when running *single* commands, this approach has some limitations. For example, running in parallel GTK and WPE MiniBrowsers. Each command would generate a different flatpak-env.json with its own config.

Related revisions and bugs:

* Initial flatpak-env.json patch: r271938 / bug220781
* Followup fix avoiding early deletion: r272018 / bug221070

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