Hi, As far as wic goes, I think this is something that should be supported, and probably wouldn't be too hard to implement, but I really haven't thought about the details much. Off the top of my head, I think it would mainly require some changes to the Wic_PartData and rootfs plugin and an extension to the rootfs syntax - possibly just appending the directory within the rootfs to the rootfs plugin e.g.:
part / --source rootfs --ondisk sda --fstype=ext3 --label platform --align 1024 part /var --source rootfs/var --ondisk sda --fstype=ext3 --label data --align 1024 The second line would cause just the contents of the /var directory of rootfs to be put into a separate partition and mounted as /var. One complication would be then subtracting that from the rootfs and leaving just the remainder mounted as / - it would probably require a copy and subtraction. Tom On Tue, 2015-01-06 at 15:05 +0000, Moore, Thomas (FtWorth) wrote: > Andre, > > > > I spent some time trying to determine how to generate multiple images > as you’ve mentioned. However, the process used to generate the rootfs > image appears to be buried deep in the Open Embedded core and I wasn’t > able to figure out how it works. Maybe someone else can chime in on > how that might be accomplished. > > > > Thomas Moore > > > > > From: Andre Marschalek [mailto:andre.marscha...@outlook.com] > Sent: Tuesday, January 06, 2015 8:34 AM > To: Moore, Thomas (FtWorth); yocto@yoctoproject.org > Subject: RE: [yocto] separate partition support > > > > > Hi Thomas, > > > > what I need is to have one image per partition > > > > for example if i need to have /opt on a different partition i would > need 2 image files at the end > > > > one containing the root partition but without /opt and one with the > contents of /opt (without /opt itself because this image will be > mounted as /opt at the end) > > > > br > > Andre > > > > From: Moore, Thomas (FtWorth) [mailto:thomas.moo...@atk.com] > Sent: Tuesday, January 6, 2015 1:01 AM > To: Andre Marschalek; yocto@yoctoproject.org > Subject: RE: [yocto] separate partition support > > > > > I’m actually experimenting with this today. > > > > Per the Development Manual, my first attempt was to use wic. While I > was able to create an image with multiple partitions, there appears to > be no way to split up the rootfs image that is created amongst the > multiple partitions. Below is the wks file I created for my test: > > > > part /boot --source bootimg-pcbios --ondisk sda --label boot --active > --align 1024 > > part / --source rootfs --ondisk sda --fstype=ext3 --label platform > --align 1024 > > part /var --source rootfs --ondisk sda --fstype=ext3 --label data > --align 1024 > > > > bootloader --timeout=0 --append="rootwait rootfstype=ext3 > video=vesafb vga=0x318 console=tty0" > > > > After running wic, I was able to examine the resulting image and there > were three partitions. However, the second and third partitions (/ > and /var) both contained the entire rootfs. In this case, I was hoping > that wic would realize that I only wanted the contents /var in the > third partition and to also not be included in the second partition. > > > > While it may be possible to create a new plugin for wic to achieve my > desired result, I’m not sure if it would be possible for the instance > of the plugin creating the / partition to be aware of the other > partitions and their mount points to be able to exclude those folders > from the / partition. Does anyone have any thoughts on this? > > > > Thanks, > > > > Thomas Moore > > > > > From:yocto-boun...@yoctoproject.org > [mailto:yocto-boun...@yoctoproject.org] On Behalf Of Andre Marschalek > Sent: Monday, January 05, 2015 5:50 PM > To: yocto@yoctoproject.org > Subject: [yocto] separate partition support > > > > > hi, > > > > splitting the root file filesystem into different partitions is a > common task and supported from every operating system during install > and should be also supported from yocto’s build system > > based on the current available documentation it seems impossible to > accomplish this task, the only available result is one full blown > image containing the root partition > > > > currently the only idea i had is to run bitbake which will generate > the root image containing everything > > create afterwards my own images with the desired size (also a new root > image because in this case IMAGE_ROOTFS_SIZE does not reflect the > ending image size) > > mount every image and move the directories from the bitbake produced > image into this new images > > and finally flash that images to my devices > > > > what do you mean? > > should this basic core functionality part of yocto’s build process > without an overhead for everyone to create isolated solutions? > > do you see a better workaround as to create new images and movements > after the build process? > > > > thank you in advance > > > > br > > Andre > > -- _______________________________________________ yocto mailing list yocto@yoctoproject.org https://lists.yoctoproject.org/listinfo/yocto
