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nativeaptinstall.bbclass- this class contains the main functionality behind the Ubuntu Distribution installation on top of the Yocto-provided root filesystemfile system.ubuntu-image.bbclass- this class contains the common functionality shared by recipes for Ubuntu-based images.
Metadata Configuration: /conf
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Dynamic layers metadata: /dynamic-layers.This directory contains the recipe tweaks appends corresponding to the core Yocto distribution and various Renesas BSP Yocto layers. The tweaks appends are required to adapt the recipes for building for the Ubuntu Desktop environment and file system directory layout which is slightly different from the one used in Yocto.
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user@rzv2hevkalphaemc:~$ systemctl list-units --state=active *.service UNIT LOAD ACTIVE SUB DESCRIPTION alsa-restore.service loaded active exited Save/Restore Sound Card State apport.service loaded active exited LSB: automatic crash report generation avahi-daemon.service loaded active running Avahi mDNS/DNS-SD Stack chrony.service loaded active running chrony, an NTP client/server console-setup.service loaded active exited Set console font and keymap containerd.service loaded active running containerd container runtime dbus.service loaded active running D-Bus System Message Bus docker.service loaded active running Docker Application Container Engine getty@tty1.service loaded active running Getty on tty1 keyboard-setup.service loaded active exited Set the console keyboard layout kmod-static-nodes.service loaded active exited Create List of Static Device Nodes ModemManager.service loaded active running Modem Manager networkd-dispatcher.service loaded active running Dispatcher daemon for systemd-networkd NetworkManager-wait-online.service loaded active exited Network Manager Wait Online NetworkManager.service loaded active running Network Manager ... |
The set of pre-installed Ubuntu packages can be specified in the image recipe such as image-ubuntu-desktop.bb using the APTGET_EXTRA_PACKAGES and APTGET_EXTRA_PACKAGES_LAST variables. The mechanics of these variables and some more is documented in the nativeaptinstall.bbclass
Using Ubuntu Compatibility Layer to Add Ubuntu Packages from Internet
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Though the Ubuntu Compatibility Layer allows for the Yocto packages to co-exist with the Ubuntu packages on the same file system, there are certain limitations which can result in ultimate mis-function of the resulting software distribution.
Possible Conflicts Between Renesas Packages and Ubuntu Compatibility Layer
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The first constituent comes from the fact that the image file system is formed in two phases. The first phase is the Yocto-based image installation where the Renesas BSP packages are installed. Then the second phase installs Ubuntu packages on top of that.
The first phase uses RPM package management system, thus these packages are not taken into account by the second phase where Ubuntu’s DEB package management system is used. This results in a situation where the files installed via unpacking of the Renesas BSP packages may then be overwritten by Ubuntu packages. If this is the case, some precautions must be explicitly taken to save the needed files after the first phase and to restore them after the second one. In the Ubuntu Compatibility layer image recipes which are based on the ubuntu-image.bbclass this can define specific functions which do the save and restore logic and add the function names to the UBUNTU_APTGET_PREFUNCS and/or UBUNTU_APTGET_POSTFUNCS variables respectively. This would allow calling the these functions right before and after the second phase.
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