Another Admin job Hudson: ensure that there are not too many old builds …

Especially if you have a large number of jobs and they are running more often, you’ll come to a point, where your disk is full of old builds.

Hudson provides a configuration parameter for that: „discard old builds“. This will delete old builds according to the specified number of days or number of builds.

For Apache I wrote a script which ensures, that all jobs have „discard“ setting and that existing values are not higher than a defined maximum value.

/** Default-Setting for the "number of old builds" */
numberOfOldBuilds  = 10

/** Maximum of "number of days" */
maxDaysOfOldBuilds = 14

/** Should we override existing values? */
overrideExistingValues = true

/** Closures for setting default 'max number' */
setMaxNum = { job ->
   job.logRotator = new hudson.tasks.LogRotator(-1, numberOfOldBuilds)
}

/** Closures for setting default 'max number' */
setMaxDays = { job ->
 job.logRotator = new hudson.tasks.LogRotator(maxDaysOfOldBuilds, -1)
}

// ----- Do the work. -----

// Access to the Hudson Singleton
hudsonInstance = hudson.model.Hudson.instance

// Retrieve all active Jobs
allItems = hudsonInstance.items
activeJobs = allItems.findAll{job -> job.isBuildable()}

// Table header
col1 = "Old".center(10)
col2 = "New".center(10)
col3 = "Job".center(50)
col4 = "Action".center(14)
header = "$col1 | $col2 | $col3 | $col4"
line = header.replaceAll("[^|]", "-").replaceAll("\\|", "+")
title = "Set 'Discard old builds'".center(line.size())

println title
println line
println header
println line

// Do work and create the result table
activeJobs.each { job ->

 // Does the job have a discard setting?
 discardActive = job.logRotator != null

 // Enforce the settings
 action   = ""
 newValue = ""
 oldValue = ""
 if (!discardActive) {
 // No discard settings, so set the default
 setMaxNum.call(job)
 action   = "established"
 newValue = "$numberOfOldBuilds jobs"
 } else {
 // What are the current settings?
 oldDays = job.logRotator.daysToKeep
 oldNums    = job.logRotator.numToKeep

 if (oldNums > 0) {
 // We have a set value for 'numbers'
 if (oldNums > numberOfOldBuilds && overrideExistingValues) {
 // value is too large so set a new one
 setMaxNum.call(job)
 action   = "updated"
 newValue = "$numberOfOldBuilds jobs"
 oldValue = "$oldNums jobs"
 } else {
 // Correct value or we arent allowed to override.
 oldValue = "$oldNums jobs"
 }
 } else {
 // we have a value for 'days'
 if (oldDays > maxDaysOfOldBuilds && overrideExistingValues) {
 // value is too large so set a new one
 setMaxDays.call(job)
 action   = "updated"
 newValue = "$maxDaysOfOldBuilds days"
 oldValue = "$oldDays days"
 } else {
 // Correct value or we aren't allowed to override.
 oldValue = "$oldDays days"
 }
 }
 }

 // String preparation for table output
 oldValue = oldValue.padLeft(10)
 newValue = newValue.padLeft(10)
 jobname  = job.name.padRight(50)

 // Table output
 println "$oldValue | $newValue | $jobname | $action"
}
println line

// Meaningful output on the Groovy console
// (the console will output the result of the last statement)
printout = "Number of Jobs: $activeJobs.size"

In the first section I define the „constants“ (line 001-008). After that I define two closures which update a given Hudson job (line 010-018).
The basic structure is the one I used in earlier scripts …
The work here is in lines 053-088. But that’s pretty easy: check the given values and eventually set new values using the pre defined closures.
New is the last line: I dont use a >x = „“< instruction for suppressing the output. I use a more meaningful message: the number of jobs.

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