func pruneTaskCollectRetained(outRetainedObjects *tools.StringSet, retainChan chan string,
progressChan PruneProgressChan, retainwait *sync.WaitGroup) {
defer retainwait.Done()
for oid := range retainChan {
if outRetainedObjects.Add(oid) {
progressChan <- PruneProgress{PruneProgressTypeRetain, 1}
}
}
}
func pruneCheckVerified(prunableObjects []string, reachableObjects, verifiedObjects tools.StringSet) {
// There's no issue if an object is not reachable and missing, only if reachable & missing
var problems bytes.Buffer
for _, oid := range prunableObjects {
// Test verified first as most likely reachable
if !verifiedObjects.Contains(oid) {
if reachableObjects.Contains(oid) {
problems.WriteString(fmt.Sprintf(" * %v\n", oid))
} else {
// Just to indicate why it doesn't matter that we didn't verify
tracerx.Printf("UNREACHABLE: %v", oid)
}
}
}
// technically we could still prune the other oids, but this indicates a
// more serious issue because the local state implies that these can be
// deleted but that's incorrect; bad state has occurred somehow, might need
// push --all to resolve
if problems.Len() > 0 {
Exit("Abort: these objects to be pruned are missing on remote:\n%v", problems.String())
}
}
// Background task, must call waitg.Done() once at end
func pruneTaskGetReachableObjects(outObjectSet *tools.StringSet, errorChan chan error, waitg *sync.WaitGroup) {
defer waitg.Done()
// converts to `git rev-list --all`
// We only pick up objects in real commits and not the reflog
opts := lfs.NewScanRefsOptions()
opts.ScanMode = lfs.ScanAllMode
opts.SkipDeletedBlobs = false
pointerchan, err := lfs.ScanRefsToChan("", "", opts)
if err != nil {
errorChan <- fmt.Errorf("Error scanning for reachable objects: %v", err)
return
}
for p := range pointerchan.Results {
outObjectSet.Add(p.Oid)
}
err = pointerchan.Wait()
if err != nil {
errorChan <- err
}
}
func prune(fetchPruneConfig config.FetchPruneConfig, verifyRemote, dryRun, verbose bool) {
localObjects := make([]localstorage.Object, 0, 100)
retainedObjects := tools.NewStringSetWithCapacity(100)
var reachableObjects tools.StringSet
var taskwait sync.WaitGroup
// Add all the base funcs to the waitgroup before starting them, in case
// one completes really fast & hits 0 unexpectedly
// each main process can Add() to the wg itself if it subdivides the task
taskwait.Add(4) // 1..4: localObjects, current & recent refs, unpushed, worktree
if verifyRemote {
taskwait.Add(1) // 5
}
progressChan := make(PruneProgressChan, 100)
// Collect errors
errorChan := make(chan error, 10)
var errorwait sync.WaitGroup
errorwait.Add(1)
var taskErrors []error
go pruneTaskCollectErrors(&taskErrors, errorChan, &errorwait)
// Populate the single list of local objects
go pruneTaskGetLocalObjects(&localObjects, progressChan, &taskwait)
// Now find files to be retained from many sources
retainChan := make(chan string, 100)
go pruneTaskGetRetainedCurrentAndRecentRefs(fetchPruneConfig, retainChan, errorChan, &taskwait)
go pruneTaskGetRetainedUnpushed(fetchPruneConfig, retainChan, errorChan, &taskwait)
go pruneTaskGetRetainedWorktree(retainChan, errorChan, &taskwait)
if verifyRemote {
reachableObjects = tools.NewStringSetWithCapacity(100)
go pruneTaskGetReachableObjects(&reachableObjects, errorChan, &taskwait)
}
// Now collect all the retained objects, on separate wait
var retainwait sync.WaitGroup
retainwait.Add(1)
go pruneTaskCollectRetained(&retainedObjects, retainChan, progressChan, &retainwait)
// Report progress
var progresswait sync.WaitGroup
progresswait.Add(1)
go pruneTaskDisplayProgress(progressChan, &progresswait)
taskwait.Wait() // wait for subtasks
close(retainChan) // triggers retain collector to end now all tasks have
retainwait.Wait() // make sure all retained objects added
close(errorChan) // triggers error collector to end now all tasks have
errorwait.Wait() // make sure all errors have been processed
pruneCheckErrors(taskErrors)
prunableObjects := make([]string, 0, len(localObjects)/2)
// Build list of prunables (also queue for verify at same time if applicable)
var verifyQueue *lfs.TransferQueue
var verifiedObjects tools.StringSet
var totalSize int64
var verboseOutput bytes.Buffer
var verifyc chan string
if verifyRemote {
cfg.CurrentRemote = fetchPruneConfig.PruneRemoteName
// build queue now, no estimates or progress output
verifyQueue = lfs.NewDownloadCheckQueue(0, 0)
verifiedObjects = tools.NewStringSetWithCapacity(len(localObjects) / 2)
// this channel is filled with oids for which Check() succeeded & Transfer() was called
verifyc = verifyQueue.Watch()
}
for _, file := range localObjects {
if !retainedObjects.Contains(file.Oid) {
prunableObjects = append(prunableObjects, file.Oid)
totalSize += file.Size
if verbose {
// Save up verbose output for the end, spinner still going
verboseOutput.WriteString(fmt.Sprintf(" * %v (%v)\n", file.Oid, humanizeBytes(file.Size)))
}
if verifyRemote {
tracerx.Printf("VERIFYING: %v", file.Oid)
pointer := lfs.NewPointer(file.Oid, file.Size, nil)
verifyQueue.Add(lfs.NewDownloadable(&lfs.WrappedPointer{Pointer: pointer}))
}
}
}
if verifyRemote {
var verifywait sync.WaitGroup
verifywait.Add(1)
go func() {
for oid := range verifyc {
verifiedObjects.Add(oid)
tracerx.Printf("VERIFIED: %v", oid)
progressChan <- PruneProgress{PruneProgressTypeVerify, 1}
}
verifywait.Done()
}()
verifyQueue.Wait()
verifywait.Wait()
close(progressChan) // after verify (uses spinner) but before check
progresswait.Wait()
pruneCheckVerified(prunableObjects, reachableObjects, verifiedObjects)
} else {
close(progressChan)
progresswait.Wait()
}
if len(prunableObjects) == 0 {
Print("Nothing to prune")
return
}
if dryRun {
Print("%d files would be pruned (%v)", len(prunableObjects), humanizeBytes(totalSize))
if verbose {
Print(verboseOutput.String())
}
} else {
Print("Pruning %d files, (%v)", len(prunableObjects), humanizeBytes(totalSize))
if verbose {
Print(verboseOutput.String())
}
pruneDeleteFiles(prunableObjects)
}
}