make niri-session POSIX compatible

Author: z-erica

resources/niri-session

@@ -5,14 +5,14 @@ if [ -n "$SHELL" ] &&
    ! (echo "$SHELL" | grep -q "false") &&
    ! (echo "$SHELL" | grep -q "nologin"); then
   if [ "$1" != '-l' ]; then
-    exec bash -c "exec -l '$SHELL' -c '$0 -l $*'"
+    exec sh -c "exec -l '$SHELL' -c '$0 -l $*'"
   else
     shift
   fi
 fi
 
 # Try to detect the service manager that is being used
-if hash systemctl &> /dev/null; then
+if hash systemctl >/dev/null 2>&1; then
     # Make sure there's no already running session.
     if systemctl --user -q is-active niri.service; then
       echo 'A niri session is already running.'
@@ -41,15 +41,15 @@ if hash systemctl &> /dev/null; then
 
     # Unset environment that we've set.
     systemctl --user unset-environment WAYLAND_DISPLAY XDG_SESSION_TYPE XDG_CURRENT_DESKTOP NIRI_SOCKET
-elif hash dinitctl &> /dev/null; then
+elif hash dinitctl >/dev/null 2>&1; then
     # Check that the user dinit daemon is running
-    if ! pgrep -u $(id -u) dinit &> /dev/null; then
+    if ! pgrep -u "$(id -u)" dinit >/dev/null 2>&1; then
       echo "dinit user daemon is not running."
       exit 1
     fi
 
     # Make sure there's no already running session.
-    if dinitctl --user is-started niri &> /dev/null; then
+    if dinitctl --user is-started niri >/dev/null 2>&1; then
       echo 'A niri session is already running.'
       exit 1
     fi