[backupserver] Speed up statistics calculation

software/backupserver/software.cfg

@@ -67,7 +67,7 @@ mode = 0644
 [template-backup-script]
 recipe = slapos.recipe.template
 url = ${:_profile_base_location_}/template-backup-script.sh.in
-md5sum = 0d8fb8ea80966af7d67ad50d50547dce
+md5sum = 47b20031db3b575651d8515d5add23e6
 output = ${buildout:directory}/template-backup-script.sh.in
 mode = 0644
 

software/backupserver/template-backup-script.sh.in

@@ -29,7 +29,7 @@ if [ $RESULT -eq 0 ]
 then
   ${coreutils-output:echo} "`${coreutils-output:date} -u`,$${:statistic_log},$${:hostname} backup success" >> $${:status_log}
   ${coreutils-output:rm} -f $${:statistic_log}
-  ${findutils-output:find} rdiff-backup-data/ -name "session_statistic*" | ${coreutils-output:sort} | ${coreutils-output:tail} -n 1 | ${findutils-output:xargs} ${rdiff-backup-output:rdiff-backup} --calculate-average >> $${:statistic_log}
+  ${findutils-output:find} rdiff-backup-data/ -maxdepth 1 -name "session_statistic*" | ${coreutils-output:sort} | ${coreutils-output:tail} -n 1 | ${findutils-output:xargs} ${rdiff-backup-output:rdiff-backup} --calculate-average >> $${:statistic_log}
 else
   ${coreutils-output:echo} "`${coreutils-output:date} -u`,$${:statistic_log},$${:hostname} backup failed" >> $${:status_log}
 fi