Only copy files which have changed

src/freedombone-base-email

     fi
 
     if [ -f /usr/local/bin/${PROJECT_NAME}-encrypt-mail ]; then
-        cp -u /usr/local/bin/${PROJECT_NAME}-encrypt-mail /usr/bin/encmaildir
+        if [ ! -f /usr/bin/encmaildir ]; then
+            cp /usr/local/bin/${PROJECT_NAME}-encrypt-mail /usr/bin/encmaildir
+        else
+            HASH1=$(sha256sum /usr/local/bin/${PROJECT_NAME}-encrypt-mail | awk -F ' ' '{print $1}')
+            HASH2=$(sha256sum /usr/bin/encmaildir | awk -F ' ' '{print $1}')
+            if [[ "$HASH1" != "$HASH2" ]]; then
+                cp /usr/local/bin/${PROJECT_NAME}-encrypt-mail /usr/bin/encmaildir
+            fi
+        fi
     else
-        cp -u /usr/bin/${PROJECT_NAME}-encrypt-mail /usr/bin/encmaildir
+        if [ ! -f /usr/bin/encmaildir ]; then
+            cp /usr/bin/${PROJECT_NAME}-encrypt-mail /usr/bin/encmaildir
+        else
+            HASH1=$(sha256sum /usr/bin/${PROJECT_NAME}-encrypt-mail | awk -F ' ' '{print $1}')
+            HASH2=$(sha256sum /usr/bin/encmaildir | awk -F ' ' '{print $1}')
+            if [[ "$HASH1" != "$HASH2" ]]; then
+                cp /usr/bin/${PROJECT_NAME}-encrypt-mail /usr/bin/encmaildir
+            fi
+        fi
     fi
 
     if [[ $(is_completed $FUNCNAME) == "1" ]]; then

src/freedombone-utils-firewall

 function global_rate_limit {
     if ! grep -q "tcp_challenge_ack_limit" /etc/sysctl.conf; then
         echo 'net.ipv4.tcp_challenge_ack_limit = 999999999' >> /etc/sysctl.conf
+        sysctl -p -q
     else
-        sed -i 's|net.ipv4.tcp_challenge_ack_limit.*|net.ipv4.tcp_challenge_ack_limit = 999999999|g' /etc/sysctl.conf
+        if ! grep -q "net.ipv4.tcp_challenge_ack_limit = 999999999" /etc/sysctl.conf; then
+            sed -i 's|net.ipv4.tcp_challenge_ack_limit.*|net.ipv4.tcp_challenge_ack_limit = 999999999|g' /etc/sysctl.conf
+            sysctl -p -q
+        fi
     fi
-    sysctl -p -q
 }
 
 function enable_ipv6 {

src/freedombone-utils-git

             chown -R www-data:www-data $repo_dir
         fi
         if [[ $repo_dir == *"gpgit" ]]; then
-            cp -u gpgit.pl /usr/bin/gpgit.pl
+            if [ ! -f /usr/bin/gpgit.pl ]; then
+                cp gpgit.pl /usr/bin/gpgit.pl
+            else
+                HASH1=$(sha256sum gpgit.pl | awk -F ' ' '{print $1}')
+                HASH2=$(sha256sum /usr/bin/gpgit.pl | awk -F ' ' '{print $1}')
+                if [[ "$HASH1" != "$HASH2" ]]; then
+                    cp gpgit.pl /usr/bin/gpgit.pl
+                fi
+            fi
         fi
         if [[ $repo_dir == *"cleanup-maildir" ]]; then
-            cp -u $INSTALL_DIR/cleanup-maildir/cleanup-maildir /usr/bin
+            if [ ! -f /usr/bin/cleanup-maildir ]; then
+                cp $INSTALL_DIR/cleanup-maildir/cleanup-maildir /usr/bin
+            else
+                HASH1=$(sha256sum $INSTALL_DIR/cleanup-maildir/cleanup-maildir | awk -F ' ' '{print $1}')
+                HASH2=$(sha256sum /usr/bin/cleanup-maildir | awk -F ' ' '{print $1}')
+                if [[ "$HASH1" != "$HASH2" ]]; then
+                    cp $INSTALL_DIR/cleanup-maildir/cleanup-maildir /usr/bin
+                fi
+            fi
         fi
         if [[ $repo_dir == *"nginx_ensite" ]]; then
-            make install
+            if [ ! -f /usr/local/bin/nginx_ensite ]; then
+                make install
+            fi
         fi
         if [[ $repo_dir == *"inadyn" ]]; then
             ./configure