On-the-fly gzip compression

Reduces backup time, free space requirement and disk writes.

bin/v-backup-user

@@ -205,10 +205,7 @@ if [ ! -z "$WEB_SYSTEM" ] && [ "$WEB" != '*' ]; then
 
         # Backup files
         cd $HOMEDIR/$user/web/$domain
-        tar -cpf $tmpdir/web/$domain/domain_data.tar * ${fargs[@]}
-
-        # Compress archive
-        gzip -$BACKUP_GZIP $tmpdir/web/$domain/domain_data.tar
+        tar -cpf- * ${fargs[@]} |gzip -$BACKUP_GZIP - > $tmpdir/web/$domain/domain_data.tar.gz
     done
 
     # Print total
@@ -307,16 +304,14 @@ if [ ! -z "$MAIL_SYSTEM" ] && [ "$MAIL" != '*' ]; then
 
         # Backup emails
         cd $HOMEDIR/$user/mail/$domain_idn
+        accounts=()
         for account in $(ls); do
             exclusion=$(echo "$MAIL" |tr ',' '\n' |grep "$domain:")
             exclusion=$(echo "$exclusion" |tr ':' '\n' |grep "^$account$")
 
             # Checking exlusions
             if [ -z "$exclusion" ] && [[ "$MAIL_SYSTEM" =~ exim ]]; then
-                echo "$(date "+%F %T") + $account@$domain" |\
-                    tee -a $BACKUP/$user.log
-                touch $tmpdir/mail/$domain/accounts.tar
-                tar -rpf $tmpdir/mail/$domain/accounts.tar $account
+                accounts+=($account)
             else
                 echo "$(date "+%F %T") excluding mail account $account" |\
                     tee -a $BACKUP/$user.log
@@ -324,8 +319,8 @@ if [ ! -z "$MAIL_SYSTEM" ] && [ "$MAIL" != '*' ]; then
         done
 
         # Compress archive
-        if [ -e "$tmpdir/mail/$domain/accounts.tar" ]; then
-            gzip -$BACKUP_GZIP $tmpdir/mail/$domain/accounts.tar
+        if [ ${#accounts[@]} -gt 0 ]; then
+            tar -cpf- ${accounts[@]} |gzip -$BACKUP_GZIP - > $tmpdir/mail/$domain/accounts.tar.gz
         fi
     done
 
@@ -445,10 +440,7 @@ if [ "$USER" != '*' ]; then
             echo -e "$(date "+%F %T") adding $udir" |tee -a $BACKUP/$user.log
 
             # Backup files and dirs
-            tar -cpf $tmpdir/user_dir/$udir.tar $udir
-
-            # Compress arhive
-            gzip -$BACKUP_GZIP $tmpdir/user_dir/$udir.tar
+            tar -cpf- $udir |gzip -$BACKUP_GZIP - > $tmpdir/user_dir/$udir.tar.gz
         fi
     done
     set +f