Re: [yocto] Make one directory writeable
As for the particular case of /mnt, on most images, /mnt is a symlink to /media, and /media is (on) a filesystem in RAM, so it's already writeable. If the write does not need to persist across reboots, use a tmpfs mount. If your real problem is that you cannot create anything in /mnt (or /media for modern users), the issue is that someone broke something in your image, because that should work out of the box. On 13-02-19 09:27, Josef Holzmayr wrote: > Hi Bhupendra, > > On Wed, Feb 13, 2019 at 12:51:17PM +0530, Bhupendra Singh wrote: >> Hello >> >> I have built core-image-minimal with read only rootfs then now I want to >> make one directory (like /mnt) writable. >> >> Is it possible to make one directory writeable in read only rootfs if yes >> ,please tell me how can I do same. > > This is not exactly yocto specific, general linux concepts apply. You > can use a secondary, tertiary, ... partition or starage device and then > mount that as read-write. But it always has to be a seperate filesystem. > There is no way to make only one path of a given filesystem RW, it > always means that the whole filesystem is writeable. > > Greetz > -- ___ yocto mailing list yocto@yoctoproject.org https://lists.yoctoproject.org/listinfo/yocto
Re: [yocto] Make one directory writeable
Hi Bhupendra, On Wed, Feb 13, 2019 at 12:51:17PM +0530, Bhupendra Singh wrote: > Hello > > I have built core-image-minimal with read only rootfs then now I want to > make one directory (like /mnt) writable. > > Is it possible to make one directory writeable in read only rootfs if yes > ,please tell me how can I do same. This is not exactly yocto specific, general linux concepts apply. You can use a secondary, tertiary, ... partition or starage device and then mount that as read-write. But it always has to be a seperate filesystem. There is no way to make only one path of a given filesystem RW, it always means that the whole filesystem is writeable. Greetz -- ——— Josef Holzmayr Software Developer Embedded Systems Tel: +49 8444 9204-48 Fax: +49 8444 9204-50 R-S-I Elektrotechnik GmbH & Co. KG Woelkestrasse 11 D-85301 Schweitenkirchen www.rsi-elektrotechnik.de ——— Amtsgericht Ingolstadt – GmbH: HRB 191328 – KG: HRA 170393 Geschäftsführer: Dr.-Ing. Michael Sorg, Dipl.-Ing. Franz Sorg Ust-IdNr: DE 128592548 _ Amtsgericht Ingolstadt - GmbH: HRB 191328 - KG: HRA 170363 Geschäftsführer: Dr.-Ing. Michael Sorg, Dipl.-Ing. Franz Sorg USt-IdNr.: DE 128592548 -- ___ yocto mailing list yocto@yoctoproject.org https://lists.yoctoproject.org/listinfo/yocto
Re: [yocto] Make one directory writeable
You can use overlayfs for this. You mount the overlayfs on top of your rootfs and then it appear like you have a writeable file system. In reality all the new stuff is written to another (writeable) file system. If you dismount the overlayfs, the rootfs reverts back to its original state. If you again mount the overlayfs, you get your modifications back. Best Regards, Ulf Samuelsson +46 722 427 437 > 13 feb. 2019 kl. 08:21 skrev Bhupendra Singh > : > > Hello > I have built core-image-minimal with read only rootfs then now I want to > make one directory (like /mnt) writable. > Is it possible to make one directory writeable in read only rootfs if yes > ,please tell me how can I do same. > > Bhupendra Singh > > -- > ___ > yocto mailing list > yocto@yoctoproject.org > https://lists.yoctoproject.org/listinfo/yocto -- ___ yocto mailing list yocto@yoctoproject.org https://lists.yoctoproject.org/listinfo/yocto
[yocto] Make one directory writeable
Hello I have built core-image-minimal with read only rootfs then now I want to make one directory (like /mnt) writable. Is it possible to make one directory writeable in read only rootfs if yes ,please tell me how can I do same. Bhupendra Singh -- ___ yocto mailing list yocto@yoctoproject.org https://lists.yoctoproject.org/listinfo/yocto
