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Ensure only a single instance of the script runs #5

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16 changes: 13 additions & 3 deletions safe-eject.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -15,12 +15,22 @@
# udisksctl → kernel unmount syscall directly
# → GVfs/Nautilus handles still live → EBUSY
#
# REQUIRES: zenity, udisks2, lsof, glib2-tools (gio)
# Install: sudo apt install zenity udisks2 lsof libglib2.0-bin
# REQUIRES: zenity, udisks2, lsof, glib2-tools (gio), flock
# Install: sudo apt install zenity udisks2 lsof libglib2.0-bin util-linux
#================================================================================

set -uo pipefail

# =============================================================================
# Preflight: Ensure the script is not already running
# =============================================================================
LOCKFILE="/tmp/safe-eject-linux.lock"
exec 9>"${LOCKFILE}"

if ! flock -n 9; then
exit 1
fi

# =============================================================================
# Preflight: verify required tools are present
# =============================================================================
Expand All @@ -30,7 +40,7 @@ for TOOL in zenity udisksctl lsof lsblk findmnt gio; do
done

if [[ ${#MISSING[@]} -gt 0 ]]; then
MSG="Required tools are not installed: ${MISSING[*]}\n\nInstall with:\n sudo apt install zenity udisks2 lsof libglib2.0-bin"
MSG="Required tools are not installed: ${MISSING[*]}\n\nInstall with:\n sudo apt install zenity udisks2 lsof libglib2.0-bin util-linux"
if command -v zenity &>/dev/null; then
zenity --error --title="Missing Dependencies" --text="$MSG" --width=400
else
Expand Down