Op 28-03-2020 om 21:06 schreef Konrad Weihmann:
AFAIK there is no way to mount something without root credentials.
You can loop mount the image file using udisksctl as an ordinary user,
which mounts the image under /media/<user name>.
fakeroot/pseudo is intercepting some calls before they will reach the
kernel, but mounting isn't a supported option - it just makes all child
processes think they running under uid 0.
What you could do is try to find an option
(https://btrfs.wiki.kernel.org/index.php/Manpage/mkfs.btrfs) which does
what you want directly while creating the image.
These options should go then to a variable called EXTRA_IMAGECMD.
On 28.03.20 16:30, Edson Seabra wrote:
Hi all.
I'm trying to compress a btrfs rootfs
I wanted to take a snap shot, see this thread:
"How to create a btrfs snapshot in the rootfs image (during build)?"
I found you need to be owner of the root directory of the image, but
there is no option to mkfs that with btrfs.
The only route for that I found was create and ext4 image with
'-E root_owner' then btrfs-convert.
But then I found there is no way to 'btrfs send' without becoming root...
See also "Howto take a snapshot from an image as ordinary user?" on lkml.
I added in "image_types.bbclass:IMAGE_CMD_btrfs ()" two commands:
1) mount the btrfs image after mkfs.btrfs
2) btrfs filesystem defrag + compress option
But the command mount fails:
mount:
/home/edson/ng-trunk/nodegrid/tmp/work/genericx86_64-poky-linux/nodegrid/1.0-r0/deploy-nodegrid-image-complete/temp_btrfs:
failed to setup loop device for
/home/edson/ng-trunk/nodegrid/tmp/work/genericx86_64-poky-linux/nodegrid/1.0-r0/deploy-nodegrid-image-complete/nodegrid-genericx86-64-20200328134151.rootfs.btrfs.
I saw in image.bbclass the creation of do_image_btrfs task with flag
'fakeroot'.
====== image.bbclass ====
task = "do_image_%s" % t.replace("-", "_").replace(".", "_")
d.setVar(task, '\n'.join(cmds))
d.setVarFlag(task, 'func', '1')
d.setVarFlag(task, 'fakeroot', '1')
=======================
would the fakeroot flag allow do_image_btrfs execute commands that
requires root privilege ?
If not what would be the way to execute the mount command ?
I tried "pseudo mount" but it failed same way...
Thanks in advance.
Edson.
*Edson Seabra*
Principal Engineer
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