diff options
Diffstat (limited to 'dot_local/bin/executable_zellij-inhibit-watcher')
| -rwxr-xr-x | dot_local/bin/executable_zellij-inhibit-watcher | 41 |
1 files changed, 30 insertions, 11 deletions
diff --git a/dot_local/bin/executable_zellij-inhibit-watcher b/dot_local/bin/executable_zellij-inhibit-watcher index 0af20dd..6af7032 100755 --- a/dot_local/bin/executable_zellij-inhibit-watcher +++ b/dot_local/bin/executable_zellij-inhibit-watcher @@ -1,20 +1,39 @@ #!/bin/sh -# Block until no zellij sessions remain. +# Block while at least one zellij server process was spawned from an +# SSH context, exit cleanly once none remain. # -# Used as the ExecStart payload of zellij-inhibit-suspend.service: the -# service wraps this script with `systemd-inhibit`, so the inhibit lock -# is held for exactly the lifetime of this process. When the last zellij -# session ends, this script exits 0, the service stops, and the lock is -# released. +# Rationale: a zellij session started locally (e.g. from a sway terminal) +# is the user actively sitting in front of the laptop — that should NOT +# inhibit suspend. Only zellij sessions started while SSH'd in deserve +# the lock, so the host stays awake across detach + disconnect but +# normal local-attended suspend still works. # -# A user-level `.path` unit re-activates the service whenever the zellij -# socket directory becomes non-empty again, so the lock is automatically -# reacquired on the next `zellij` invocation. +# Detection: zellij's daemonised server is exec'd by the client and +# inherits the client's environment. Linux preserves that exec-time +# environment in /proc/<pid>/environ for the life of the process, even +# after the original SSH session is gone. So an "ssh-spawned" zellij is +# one whose environ contains SSH_CONNECTION=. +# +# This script is the ExecStart payload of zellij-inhibit-suspend.service, +# which wraps it in systemd-inhibit. When this script exits, the lock is +# released. The .path unit re-fires the service on the next zellij socket +# transition. set -eu poll=${ZELLIJ_INHIBIT_POLL:-15} -while sessions=$(zellij list-sessions --short 2>/dev/null) && - [ -n "$sessions" ]; do +has_ssh_zellij() { + pids=$(pgrep -x zellij 2>/dev/null) || return 1 + for pid in $pids; do + [ -r "/proc/$pid/environ" ] || continue + if tr '\0' '\n' <"/proc/$pid/environ" 2>/dev/null | + grep -q '^SSH_CONNECTION='; then + return 0 + fi + done + return 1 +} + +while has_ssh_zellij; do sleep "$poll" done |