Friday, 2021-09-17

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CroftonDoes anyone have state of the art for using an overlayfs to add r/w to a root mounted as read only?18:27
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smurrayCrofton: there was an overlayfs feature added to oe-core recently, but I wasn't paying attention enough to know if it covers that exact usecase18:40
Croftonah right18:40
Croftonthanks for reminding me18:41
CroftonI've switched from a qspi based root to an overlay based off emmc (entirely( but now want to preserve existing root filesytem as the  lower18:41
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Croftonseems based off systemd ...18:46
Croftonalso seems to not be setup to replace the rootfs, just a directory18:48
Croftonand thanks for the reminder18:51
mrumounting an overlay directly on the root seems like a weird thing to do18:52
Croftonsay you want to install a package update, this will touch things in a couple of top level directories18:52
mrupackages, ugh18:53
Croftonderailed your line of thought :)18:54
mruanyway, you normally have bunch of special filesystems mounted18:55
mruproc, sys, dev, tmp, ...18:55
mruyou really wouldn't want an overlay to intercept /sys18:55
mruor /dev18:55
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JPEWCrofton: You're best bet is probably to have an initrd do that before booting /init on the main rootfs19:40
JPEWWe overlay read-only / in our initrd, but only as a developer aid so that devs can test rootfs changes live; we don't do it in production19:42
smurrayonly overlaying configuration related things seems more common from what I've heard from other folks that have told me they ship something using it19:43
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