Poky today has three different package managers, the well-known formats deb and rpm is supported as well as ipkg that is good for embedded devices.
When building and having a good cache hit, a significant amount of time is spent in the phase of generating a rootfs, which is really about the performance of the package manager. ipkg is way slower than deb or rpm. To save build time and also get a package manager that is suitanle for use on targets where flash memory is a concern, support for apk is suggested. However, it might or might not be what's wanted for Poky since it increases the test matrix. Therefore this patch series refactors the package management code so that it's possible to add more package managers in other own layer. I will send another patch serie that will add apk. Perfomance metrics below, (note that this includes build times). APK === bitbake core-image-minimal 15.84s user 2.60s system 0% cpu 1:26:19.21 total 16.01s user 2.58s system 0% cpu 1:26:03.72 total 15.69s user 2.61s system 0% cpu 1:26:45.45 total bitbake core-image-minimal -c cleansstate bitbake core-image-minimal -c clean bitbake core-image-minimal -f -c do_rootfs 0.55s user 0.06s system 4% cpu 14.236 total 0.54s user 0.08s system 4% cpu 15.247 total 0.52s user 0.15s system 4% cpu 15.143 total RPM === bitbake core-image-minimal 18.57s user 3.09s system 0% cpu 1:31:29.09 total 18.58s user 3.08s system 0% cpu 1:30:53.80 total 18.20s user 3.31s system 0% cpu 1:31:06.69 total bitbake core-image-minimal -c cleansstate bitbake core-image-minimal -c clean bitbake core-image-minimal -c do_rootfs -f 0.58s user 0.10s system 3% cpu 19.470 total 0.57s user 0.09s system 3% cpu 19.480 total 0.60s user 0.07s system 3% cpu 20.381 total
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