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Introduce debug tags and debug breaks

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The environment variable DEBUG_TAGS can be used to control what is
printed on stderr. Example:

    DEBUG_TAGS="+all,-Archiver.*" ./restic backup foo

The variable DEBUG_BREAK can be used to set a breakpoint (implemented
using SIGSTOP):

    DEBUG_BREAK=Archiver.Snapshot ./restic backup foo
This commit is contained in:
Alexander Neumann
2015-01-11 14:09:44 +01:00
parent 203a911de9
commit 48751e1935
5 changed files with 134 additions and 32 deletions
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archiver.go
+11 -9
View File
@@ -64,12 +64,12 @@ func (arch *Archiver) Save(t backend.Type, data []byte) (Blob, error) {
// compute plaintext hash
id := backend.Hash(data)
debug("Save(%v, %v)\n", t, id.Str())
debug("Archiver.Save", "Save(%v, %v)\n", t, id.Str())
// test if this blob is already known
blob, err := arch.m.FindID(id)
if err == nil {
debug("Save(%v, %v): reusing %v\n", t, id.Str(), blob.Storage.Str())
debug("Archiver.Save", "Save(%v, %v): reusing %v\n", t, id.Str(), blob.Storage.Str())
id.Free()
return blob, nil
}
@@ -84,7 +84,7 @@ func (arch *Archiver) Save(t backend.Type, data []byte) (Blob, error) {
// one and remove the other. This happens if the same plaintext blob was
// stored concurrently and finished earlier than this blob.
if blob.Storage.Compare(smapblob.Storage) != 0 {
debug("using other block, removing %v\n", blob.Storage.Str())
debug("Archiver.Save", "using other block, removing %v\n", blob.Storage.Str())
// remove the blob again
// TODO: implement a list of blobs in transport, so this doesn't happen so often
@@ -94,7 +94,7 @@ func (arch *Archiver) Save(t backend.Type, data []byte) (Blob, error) {
}
}
debug(": Save(%v, %v): new blob %v\n", t, id.Str(), blob)
debug("Archiver.Save", "Save(%v, %v): new blob %v\n", t, id.Str(), blob)
return smapblob, nil
}
@@ -262,7 +262,7 @@ func (arch *Archiver) SaveFile(node *Node) (Blobs, error) {
}
func (arch *Archiver) saveTree(t *Tree) (Blob, error) {
debug("saveTree(%v)\n", t)
debug("Archiver.saveTree", "saveTree(%v)\n", t)
var wg sync.WaitGroup
// add all blobs to global map
@@ -286,7 +286,7 @@ func (arch *Archiver) saveTree(t *Tree) (Blob, error) {
for _, id := range node.Content {
blob, err := t.Map.FindID(id)
if err != nil {
debug("unable to find storage id for data blob %v", id.Str())
debug("Archiver.saveTree", "unable to find storage id for data blob %v", id.Str())
arch.Error(node.path, nil, fmt.Errorf("unable to find storage id for data blob %v", id.Str()))
removeContent = true
t.Map.DeleteID(id)
@@ -295,7 +295,7 @@ func (arch *Archiver) saveTree(t *Tree) (Blob, error) {
}
if ok, err := arch.s.Test(backend.Data, blob.Storage); !ok || err != nil {
debug("blob %v not in repository (error is %v)", blob, err)
debug("Archiver.saveTree", "blob %v not in repository (error is %v)", blob, err)
arch.Error(node.path, nil, fmt.Errorf("blob %v not in repository (error is %v)", blob.Storage.Str(), err))
removeContent = true
t.Map.DeleteID(id)
@@ -304,7 +304,7 @@ func (arch *Archiver) saveTree(t *Tree) (Blob, error) {
}
if removeContent {
debug("removing content for %s", node.path)
debug("Archiver.saveTree", "removing content for %s", node.path)
node.Content = node.Content[:0]
}
}
@@ -370,7 +370,7 @@ func (arch *Archiver) saveTree(t *Tree) (Blob, error) {
after := len(t.Map.IDs())
if before != after {
debug("pruned %d ids from map for tree %v\n", before-after, t)
debug("Archiver.saveTree", "pruned %d ids from map for tree %v\n", before-after, t)
}
blob, err := arch.SaveTreeJSON(t)
@@ -382,6 +382,8 @@ func (arch *Archiver) saveTree(t *Tree) (Blob, error) {
}
func (arch *Archiver) Snapshot(dir string, t *Tree, parentSnapshot backend.ID) (*Snapshot, backend.ID, error) {
debug_break("Archiver.Snapshot")
arch.p.Start()
defer arch.p.Done()