Let wic call bitbake seems to be a great idea. One question is open to me. What's the recommended approach to resolve the dependencies between the image, the bootloader and native tools which are additionally required to create the final disk image? Basically the right place to resolve this dependency is the kickstart file. Bitbake should not even know that syslinux or any other bootloader will be added to the final disk image. In other words IMAGE_EXTRA_DEPENDS or similar are not the right place to add the bootloader dependency anymore. But if bitbake does not provide e.g. syslinux-native wic will fail to use it. This is kind of a chicken egg problem... A nice solution would be if wic would maintain a simple dependency list For example: There is a kickstart file assembling a disk image including my-mini-image and syslinux-native. To create the partition layout, parted-native is required as well. Hence bitbake should be called like this: "bitbake my-mini-image parted-native syslinux-native" before wic starts assembling the disk image. my-mini-image is provided by the -e parameter of wic. The latter two tools should be provided by the wic plugins creating the partitions and the disk image. My proposal is to extend the internal API of wic by a dependency list where plugins can append required tools e.g. during start up of wic. This would enable the disk plugin to request "parted-native" and the boot partition plugin to request "syslinux-native" before bitbake is called. Further on one more problem could be solved easily. If wic takes care about the final disk assembly bitbake --fetch-only might not be sufficient to download everything needed to create the whole firmware. This makes it hard to create a complete premirror. If wic would support the dependency list as mentioned above and provide a command line parameter --fetch-only everything would be consistent. Instead of calling "bitbake my-mini-image --fetch-only" the user just calls the corresponding wic command with --fetch-only appended. This would result in "bitbake my-mini-image parted-native syslinux-native --fetch-only".
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