Bug 11283

Summary:	wic: allow wic to update a kernel or bootloader in a disk image
Product:	[Build System, Metadata & Runtime] OE-Core	Reporter:	Stephano Cetola <stephano>
Component:	Scripts and Tools	Assignee:	Ed Bartosh <eduard.bartosh>
Status:	RESOLVED FIXED	QA Contact:
Severity:	enhancement
Priority:	Medium+	CC:	brian.avery, california.l.sullivan, ross.burton, sgw, stephano
Version:	2.2
Target Milestone:	2.4 M1
Hardware:	x86
OS:	Multiple
Whiteboard:
OS type for building Yocto:	---	Type of Regression:	---
Verified:		Documentation change:	Don't know

Description Stephano Cetola 2017-03-31 18:47:42 UTC

Often, especially when doing board bring-up, modifications to the kernel must happen at a fast pace. This often requires burning the disk image to some medium (uSD card) and booting the board numerous times.

Wic should be able to update an existing image with a new bootloader and/or kernel without having to rebuild the entire rootfs.

We can assume that the user has sudo, however if you can find a way to do this without sudo, Brian will buy you a round confectionery present.

e.g.
wic --update-kernel <kernel_path>  image.wic
wic --update-bootloader <bootloader_path> image.wic

Comment 1 Ed Bartosh 2017-05-10 11:26:40 UTC

As boot partition is usually msdos/vfat type it should be possible to use mtools https://www.gnu.org/software/mtools/manual/mtools.html for this task.
This would allow users to update files on boot vfat partition without mounting the image.

Comment 2 Ed Bartosh 2017-05-11 15:43:17 UTC

here is a list of new wic commands I ended up with:

1. copy files or directories to/from vfat partition of the image:

wic copy <src> <dst>

   - copy file or directory to the image:
     wic cp [-r] <local path> <image path>:<partition number>/<path>

   - copy file or directory from the image:
     wic cp [-r] <image path>:<partition number>/<path> <local path>

2. list partitions:
wic ls <image path>

3. list files on vfat partition:
wic ls <image path>:<partition number>/<path>

4. remove files/directories from vfat partition:

wic rm [-r] <image path>:<partition number>/<path>

Thoughts?

Comment 3 Ed Bartosh 2017-05-15 14:22:02 UTC

Implemented 'wic ls': http://lists.openembedded.org/pipermail/openembedded-core/2017-May/136678.html

Comment 4 Ed Bartosh 2017-05-26 09:22:59 UTC

implemented 'wic cp': http://lists.openembedded.org/pipermail/openembedded-core/2017-May/137118.html

Comment 5 Ed Bartosh 2017-06-02 17:22:40 UTC

implemented 'wic rm': http://lists.openembedded.org/pipermail/openembedded-core/2017-June/137500.html

Comment 6 Ed Bartosh 2017-06-14 09:51:02 UTC

merged to poky master. commit id: 1de1a34a64d2e34d438f6d24adbd70a62366dab7