While poking around some things in brave and gnome-calculator I noticed this:
$ snap run --shell gnome-calculator
main.go:224: cannot change mount namespace of snap "gnome-calculator" according to change mount (/snap/gtk-common-themes/816/share/icons/Suru /snap/gnome-calculator/260/data-dir/icons/Suru none bind,ro 0 0): cannot use "/snap/gtk-common-themes/816/share/icons/Suru" as bind-mount source: not a directory
main.go:224: cannot change mount namespace of snap "gnome-calculator" according to change mount (/snap/gtk-common-themes/816/share/sounds/Yaru /snap/gnome-calculator/260/data-dir/sounds/Yaru none bind,ro 0 0): cannot write to "/snap/gtk-common-themes/816/share/sounds/Yaru" because it would affect the host in "/snap/"
main.go:224: cannot change mount namespace of snap "gnome-calculator" according to change mount (/snap/gtk-common-themes/816/share/sounds/communitheme /snap/gnome-calculator/260/data-dir/sounds/communitheme none bind,ro 0 0): cannot write to "/snap/gtk-common-themes/816/share/sounds/communitheme" because it would affect the host in "/snap/"
# brave
$ snap run --shell brave
main.go:224: cannot change mount namespace of snap "brave" according to change mount (/snap/gtk-common-themes/816/share/icons/Suru /snap/brave/44/data-dir/icons/Suru none bind,ro 0 0): cannot use "/snap/gtk-common-themes/816/share/icons/Suru" as bind-mount source: not a directory
main.go:224: cannot change mount namespace of snap "brave" according to change mount (/snap/gtk-common-themes/816/share/sounds/Yaru /snap/brave/44/data-dir/sounds/Yaru none bind,ro 0 0): cannot write to "/snap/gtk-common-themes/816/share/sounds/Yaru" because it would affect the host in "/snap/"
main.go:224: cannot change mount namespace of snap "brave" according to change mount (/snap/gtk-common-themes/816/share/sounds/communitheme /snap/brave/44/data-dir/sounds/communitheme none bind,ro 0 0): cannot write to "/snap/gtk-common-themes/816/share/sounds/communitheme" because it would affect the host in "/snap/"
Looks like the Suru icon theme is actually a symlink to communitheme:
$ ls -l /snap/gtk-common-themes/current/share/icons/Suru
lrwxrwxrwx 1 root root 12 11-08 17:56 /snap/gtk-common-themes/current/share/icons/Suru -> communitheme
gtk-common-themes snap declares this slot:
sound-themes:
interface: content
source:
read:
- $SNAP/share/sounds/communitheme
- $SNAP/share/sounds/Yaru
but $SNAP/share/sounds does not exist in the snap.