Setting symlinks and restarting services

diff --git a/bin/update-minecraft-server-jar b/bin/update-minecraft-server-jar
index 692ad2f16c16c317078a78e1b3a6285f779213a0..062aeab8f2e96e26c798af42ebcaa150db474dd4 100755 (executable)
--- a/bin/update-minecraft-server-jar
+++ b/bin/update-minecraft-server-jar
@@ -34,6 +34,7 @@ UPSTREAM_VERSION=
 DOWNLOAD_URL=
 SHA1_SUM=
 TARGET_JAR=
+NEED_RESTART='n'
 
 DESCRIPTION=$( cat <<-EOF
        Update Micraft server .jar file.
@@ -232,6 +233,7 @@ do_download() {
         eval ${cmd}
     fi
     CHOWN "${MC_USER}:${MC_GROUP}" "${TARGET_JAR}"
+    NEED_RESTART='y'
 
 }
 
@@ -252,6 +254,76 @@ check_sha1() {
 
 }
 
+#------------------------------------------------------------------------------
+fix_symlinks() {
+
+    info "Checking symlink in '${CYAN}${MC_BACKUP_DIR}${NORMAL}' ..."
+
+    if [[ -e "${MC_SERVER_CUR_LINK_BASE}" ]] ; then
+        if [[ ! -h "${MC_SERVER_CUR_LINK_BASE}" ]] ; then
+            error "Path '${RED}/${MC_SERVER_CUR_LINK_BASE}${NORMAL}' exists, but is not a symlink."
+            exit 7
+        fi
+        if [[ ! -f "${MC_SERVER_CUR_LINK_BASE}" ]] ; then
+            error "Symlink '${RED}/${MC_SERVER_CUR_LINK_BASE}${NORMAL}' exists, but shows not to a regular file."
+            exit 7
+        fi
+
+        local link_target=$( readlink -e "${MC_SERVER_CUR_LINK_BASE}" )
+        debug "Current symlink points to '${CYAN}${link_target}${NORMAL}'."
+        local canon_path_target_jar=$( readlink -e "${TARGET_JAR}" )
+        debug "Absolute path of target jar file: '${CYAN}${canon_path_target_jar}${NORMAL}'."
+
+        if [[ "${link_target}" != "${canon_path_target_jar}" ]] ; then
+            info "Symlink '${CYAN}${MC_SERVER_CUR_LINK_BASE}${NORMAL}' must be corrected."
+            LN -sf "${TARGET_JAR}" "${MC_SERVER_CUR_LINK_BASE}"
+            NEED_RESTART='y'
+        fi
+
+    else
+
+        info "Symlink '${CYAN}${MC_SERVER_CUR_LINK_BASE}${NORMAL}' does not exists, will be created."
+        LN -sf "${TARGET_JAR}" "${MC_SERVER_CUR_LINK_BASE}"
+        NEED_RESTART='y'
+
+    fi
+
+}
+
+#------------------------------------------------------------------------------
+restart_service() {
+
+    local -a services=()
+    local service=
+
+    for service in $( systemctl --plain --type=service --state=running --no-legend --no-pager | \
+            grep '^minecraft' | awk '{print $1}' ) ; do
+        services+=( "${service}" )
+    done
+
+    if [[ "${#services[*]}" == 0 ]] ; then
+        info "No services found to restart."
+        return
+    fi
+
+    empty_line
+    for service in "${ervices[@]}" ; do
+        info "Restarting '${CYAN}${service}${NORMAL}' ..."
+        if [[ "${SIMULATE}" != "y" ]] ; then
+            systemctl restart "${service}"
+        fi
+    done
+
+    sleep 15
+
+    for service in "${ervices[@]}" ; do
+        empty_line
+        info "Status of '${CYAN}${service}${NORMAL}':"
+        systemctl status "${service}"
+    done
+
+}
+
 #------------------------------------------------------------------------------
 main() {
 
@@ -261,15 +333,19 @@ main() {
     check_preferences
     detecting_cur_version
     get_upstream_info
-    if [[ -f "${TARGET_JAR}" ]] ; then
-        check_sha1
-    fi
-    if [[ "${UPSTREAM_VERSION}" == "${CURRENT_VERSION}" ]] ; then
-        info "Version '${GREEN}${UPSTREAM_VERSION}${NORMAL}' not changed, no update."
-        exit 0
+    if [[ ! -f "${TARGET_JAR}" ]] ; then
+        do_download
     fi
-    do_download
+    # if [[ "${UPSTREAM_VERSION}" == "${CURRENT_VERSION}" ]] ; then
+    #     info "Version '${GREEN}${UPSTREAM_VERSION}${NORMAL}' not changed, no update."
+    #     exit 0
+    # fi
     check_sha1
+    fix_symlinks
+
+    if [[ "${NEED_RESTART}" == "y" ]] ; then
+        restart_service
+    fi
 
 }