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fix(terminal): plain bash as bfkiosk, no sudo/root + journal via group

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Mitchell R 2026-05-22 23:35:40 +02:00
parent 16412d5ad6
commit 750ff1eab2
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2 changed files with 7 additions and 43 deletions
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6
deploy/pi-gen/stage-betterframe-client/01-install-kiosk/01-run-chroot.sh
View file

@ -7,16 +7,12 @@
if ! id -u bfkiosk >/dev/null 2>&1; then
useradd -m -s /usr/sbin/nologin bfkiosk
fi
for grp in video render input audio; do
for grp in video render input audio systemd-journal; do
if getent group "$grp" >/dev/null; then
usermod -a -G "$grp" bfkiosk
fi
done
# --- Passwordless sudo for bfkiosk (remote terminal runs as root) ---
echo 'bfkiosk ALL=(ALL) NOPASSWD: ALL' > /etc/sudoers.d/betterframe-kiosk
chmod 440 /etc/sudoers.d/betterframe-kiosk
# --- Binary ---
install -d -o bfkiosk -g bfkiosk -m 755 /opt/betterframe/kiosk
install -m 755 /tmp/bf-files/betterframe-kiosk /opt/betterframe/kiosk/betterframe-kiosk

44
kiosk/src/remote_debug.rs
View file

@ -121,21 +121,11 @@ impl JournalStream {
let kill_clone = kill.clone();
std::thread::spawn(move || {
// Use systemd-run to escape NoNewPrivileges and read journal as root.
let mut child = match Command::new("systemd-run")
.args([
"--pipe", "--quiet", "--service-type=exec",
"--property=User=root",
"journalctl", "-u", "betterframe-kiosk", "-f", "--no-pager", "-o", "short-iso", "-n", "50",
])
let mut child = match Command::new("journalctl")
.args(["-f", "--no-pager", "-o", "short-iso", "-n", "50"])
.stdout(Stdio::piped())
.stderr(Stdio::piped())
.spawn()
.or_else(|_| Command::new("journalctl")
.args(["-f", "--no-pager", "-o", "short-iso", "-n", "50"])
.stdout(Stdio::piped())
.stderr(Stdio::piped())
.spawn())
{
Ok(c) => c,
Err(e) => {
@ -223,36 +213,14 @@ pub struct TerminalSession {
impl TerminalSession {
pub fn spawn() -> Result<(Self, std::process::ChildStdout, std::process::ChildStderr), String> {
// The kiosk runs under NoNewPrivileges=yes (WebKit bwrap needs
// it), which blocks sudo/nsenter from this process tree. Use
// systemd-run to spawn a SEPARATE service unit that runs bash
// as root in its own process tree — not a child of the kiosk.
// The --pipe flag connects stdin/stdout/stderr to our process.
let mut child = Command::new("systemd-run")
.args([
"--pipe", // connect stdio to us
"--quiet", // suppress service info on stderr
"--service-type=exec",
"--property=User=root",
"-E", "TERM=xterm-256color",
"-E", "HOME=/root",
"bash", "--login",
])
let mut child = Command::new("bash")
.args(["--login"])
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.stderr(Stdio::piped())
.env("TERM", "xterm-256color")
.spawn()
.or_else(|_| {
// Fallback: plain bash as bfkiosk (limited but something).
Command::new("bash")
.args(["--login"])
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.stderr(Stdio::piped())
.env("TERM", "xterm-256color")
.spawn()
})
.map_err(|e| format!("shell spawn: {e}"))?;
.map_err(|e| format!("bash spawn: {e}"))?;
let stdout = child.stdout.take().ok_or("no stdout")?;
let stderr = child.stderr.take().ok_or("no stderr")?;