From 92bc6f43c8f625c0374dd4ecae2a28263da9c225 Mon Sep 17 00:00:00 2001
From: Ryan Cavicchioni <ryan@cavi.cc>
Date: Mon, 20 Apr 2020 22:29:43 -0500
Subject: [PATCH] add craftbukkit restic hook

---
 roles/restic/files/hooks/craftbukkit.sh | 116 ++++++++++++++++++++++++
 1 file changed, 116 insertions(+)
 create mode 100644 roles/restic/files/hooks/craftbukkit.sh

diff --git a/roles/restic/files/hooks/craftbukkit.sh b/roles/restic/files/hooks/craftbukkit.sh
new file mode 100644
index 0000000..c9e0771
--- /dev/null
+++ b/roles/restic/files/hooks/craftbukkit.sh
@@ -0,0 +1,116 @@
+#!/bin/bash
+
+set -e
+
+SERVICE=craftbukkit.service
+VAR_DIR=/var/opt/craftbukkit
+WAIT=30
+VERBOSE=${VERBOSE:-4}
+
+prereq() {
+    local service=$1
+    if ! systemctl list-units --full --all | grep -Fq "$service"; then
+        printf "%s unit does not exit\n" "$service"
+        exit 1
+    fi
+}
+
+error_exit() {
+    printf "%s\n" "$1" >&2
+    exit 1
+}
+
+stop_server() {
+    local unit="${1:-$SERVICE}"
+    local attempts="${2:-$WAIT}"
+
+    if ! systemctl -q is-enabled "$unit"; then
+        printf "%s is not enabled, skipping.\n" "$unit"
+        return 0
+    fi
+
+    if ! systemctl -q is-active "$unit"; then
+        printf "%s is already stopped\n" "$unit"
+        return 0
+    fi
+
+    systemctl -q stop "$unit"
+
+    while systemctl -q is-active "$unit"; do
+        printf "waiting for %s to stop ... (%s)\n" "$unit" "$attempts"
+        ((attempts--))
+        if ((attempts == 0)); then
+            return 1
+        fi
+        sleep 1
+    done
+
+    return 0
+}
+
+start_server() {
+    local unit="${1:-$SERVICE}"
+    local attempts="${2:-$WAIT}"
+
+    if ! systemctl -q is-enabled "$unit"; then
+        printf "%s is not enabled, skipping.\n" "$unit"
+        return 0
+    fi
+
+    if systemctl -q is-active "$unit"; then
+        printf "%s is already started\n" "$unit"
+        return 0
+    fi
+
+    systemctl -q start "$unit"
+
+    while ! systemctl -q is-active "$unit"; do
+        printf "waiting for %s to start ... (%d)\n" "$unit" "$attempts"
+        ((attempts--))
+        if ((attempts == 0)); then
+            return 1
+        fi
+        sleep 1
+    done
+
+    return 0
+}
+
+
+open_files() {
+    local dir=${1-$VAR_DIR}
+    local attempts="${2:-$WAIT}"
+
+    while (($(lsof +D "$dir" | wc -l) > 0)); do
+        printf "waiting for open files ... (%d)\n" "$attempts"
+        ((attempts--))
+        if ((attempts == 0)); then
+            return 1
+        fi
+        sleep 1
+    done
+
+    return 0
+}
+
+
+main() {
+
+    if [ "$1" == "pre" ]; then
+        if ! stop_server $SERVICE; then
+            error_exit "Failed to stop $SERVICE"
+        fi
+
+        printf "checking for open files\n"
+
+        if ! open_files $VAR_DIR; then
+            error_exit "Open files exist in $VAR_DIR"
+        fi
+    elif [ "$1" == "post" ]; then
+        if ! start_server $SERVICE; then
+            error_exit "Failed to start $SERVICE"
+        fi
+    fi
+}
+
+main "$@"