qubes-snappy-fix.sh

#!/bin/bash -e
if [ "$1" = "install" ]; then
    echo "binds+=( '/var/lib/snapd' '/snap' )" >/etc/qubes-bind-dirs.d/50_snapd.conf
    cat >/etc/systemd/system/qubes-snappy-fix.service <<EOF
[Unit]
Description=Rebuild the non-persistent snappy systemd mounts
After=qubes-mount-dirs.service
DefaultDependencies=no
Before=snapd.service

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/opt/qubes-snappy-fix.sh mount

[Install]
WantedBy=multi-user.target
EOF
    systemctl -q enable qubes-snappy-fix.service
    echo "Before using snap, restart the VM to activate the bind-mounts"
elif [ "$1" = "mount" ]; then
    if [ ! -e /usr/bin/snap ]; then
        echo "snappy is not installed on this system" >&2
        exit 1
    fi
    cd /var/lib/snapd/snaps/
    while read app revision; do
        if [ ! -e /etc/systemd/system/snap-$app-$revision.mount ]; then
            cat >/etc/systemd/system/snap-$app-$revision.mount <<EOF
[Unit]
Description=Mount unit for ${app}, revision ${revision}
After=qubes-snappy-fix.service
Before=snapd.service

[Mount]
What=/var/lib/snapd/snaps/${app}_${revision}.snap
Where=/snap/${app}/${revision}
Type=squashfs
Options=nodev,ro,x-gdu.hide

[Install]
WantedBy=multi-user.target
EOF
            systemctl -q enable snap-$app-$revision.mount
            systemctl -q start snap-$app-$revision.mount
        fi
    done < <(ls *.snap | cut -d'.' -f1 | sed 's/_/ /')
else
    echo "Usage: $0 <install|mount>" >&2
    exit 1
fi