ujust update recipe fails with new stable and testing ISOs

[inffy]

After installation on a first boot, if you try to run ujust update it will fails:

jq: parse error: Invalid numeric literal at line 1, column 6
error: recipe `update` failed with exit code 5

I noticed that after install in the first boot, if i run sudo bootc status

mount: (hint) your fstab has been modified, but systemd still uses
       the old version; use 'systemctl daemon-reload' to reload.
● Booted image: ghcr.io/ublue-os/aurora:stable
        Digest: sha256:06329495185ee898d861bb967ababb55dff58ddd8fdbe28cad625a307ea6a7e2 (amd64)
       Version: 44.20260902.1 (2026-09-02T03:57:54Z)

so it seems to trip itself here

common/system_files/shared/usr/share/ublue-os/just/update.just

Lines 38 to 42 in 1a1d640

	elif [[ "${IS_OSTREE}" == "true" ]]; then
	# Without password would be nice
	# https://github.com/bootc-dev/bootc/issues/409
	STATUS=$(sudo bootc status --json | jq ".status")

which was part of the #256

So we probably need to parse out the mount.... stuff from the status so jq gets a clean json

sudo bootc status --json

mount: (hint) your fstab has been modified, but systemd still uses
       the old version; use 'systemctl daemon-reload' to reload.
{"apiVersion":"org.containers.bootc/v1","kind":"BootcHost","metadata":{"name":"host"},"spec":{"bootOrder":"default","image":{"image":"ghcr.io/ublue-os/aurora:stable","signature":"containerPolicy","transport":"registry"}},"status":{"booted":{"cachedUpdate":null,"composefs":null,"downloadOnly":false,"image":{"architecture":"amd64","image":{"image":"ghcr.io/ublue-os/aurora:stable","signature":"containerPolicy","transport":"registry"},"imageDigest":"sha256:06329495185ee898d861bb967ababb55dff58ddd8fdbe28cad625a307ea6a7e2","timestamp":"2026-09-02T03:57:54Z","version":"44.20260902.1"},"incompatible":false,"ostree":{"checksum":"48ab73bb3af6cbfe502003caf92810937699d2760e35f166cc30a95ccf2ecfeb","deploySerial":0,"stateroot":"default"},"pinned":false,"softRebootCapable":true,"store":"ostreeContainer"},"readOnly":false,"rollback":null,"rollbackQueued":false,"staged":null,"type":"bootcHost","usrOverlay":null}}

This error goes away if you reboot the machine a second time after install.

ISOs that are in the dl-test bucket are affected, not the production iso on the website

[renner0e]

so what seems to happen here is that bootc-fstab-edit.service appends ro

# /run/systemd/generator/-.mount
# Automatically generated by systemd-fstab-generator
 
[Unit]
Documentation=man:fstab(5) man:systemd-fstab-generator(8)
SourcePath=/etc/fstab
Before=local-fs.target
After=blockdev@dev-disk-by\x2duuid-573d6364\x2db867\x2d4842\x2d9943\x2df0d017db2d7c.target
 
[Mount]
What=/dev/disk/by-uuid/573d6364-b867-4842-9943-f0d017db2d7c
Where=/
Type=btrfs
Options=subvol=root,compress=zstd:1

--- old.txt     2026-09-03 15:36:51.718036855 +0200
+++ new.txt     2026-09-03 15:37:02.532315869 +0200
@@ -11,4 +11,4 @@
What=/dev/disk/by-uuid/573d6364-b867-4842-9943-f0d017db2d7c
Where=/
Type=btrfs
-Options=subvol=root,compress=zstd:1
+Options=subvol=root,compress=zstd:1,ro

Updated /etc/fstab to add `ro` for `/`