3 import "github.com/git-lfs/git-lfs/tools"
6 // blobSizeCutoff is used to determine which files to scan for Git LFS
7 // pointers. Any file with a size below this cutoff will be scanned.
10 // stdoutBufSize is the size of the buffers given to a sub-process stdout
13 // chanBufSize is the size of the channels used to pass data from one
14 // sub-process to another.
18 // WrappedPointer wraps a pointer.Pointer and provides the git sha1
19 // and the file name associated with the object, taken from the
21 type WrappedPointer struct {
29 // catFileBatchCheck uses git cat-file --batch-check to get the type
30 // and size of a git object. Any object that isn't of type blob and
31 // under the blobSizeCutoff will be ignored. revs is a channel over
32 // which strings containing git sha1s will be sent. It returns a channel
33 // from which sha1 strings can be read.
34 func catFileBatchCheck(revs *StringChannelWrapper, lockableSet *lockableNameSet) (*StringChannelWrapper, chan string, error) {
35 smallRevCh := make(chan string, chanBufSize)
36 lockableCh := make(chan string, chanBufSize)
37 errCh := make(chan error, 2) // up to 2 errors, one from each goroutine
38 if err := runCatFileBatchCheck(smallRevCh, lockableCh, lockableSet, revs, errCh); err != nil {
41 return NewStringChannelWrapper(smallRevCh, errCh), lockableCh, nil
44 // catFileBatch uses git cat-file --batch to get the object contents
45 // of a git object, given its sha1. The contents will be decoded into
46 // a Git LFS pointer. revs is a channel over which strings containing Git SHA1s
47 // will be sent. It returns a channel from which point.Pointers can be read.
48 func catFileBatch(revs *StringChannelWrapper, lockableSet *lockableNameSet) (*PointerChannelWrapper, chan string, error) {
49 pointerCh := make(chan *WrappedPointer, chanBufSize)
50 lockableCh := make(chan string, chanBufSize)
51 errCh := make(chan error, 5) // shared by 2 goroutines & may add more detail errors?
52 if err := runCatFileBatch(pointerCh, lockableCh, lockableSet, revs, errCh); err != nil {
55 return NewPointerChannelWrapper(pointerCh, errCh), lockableCh, nil
58 // ChannelWrapper for pointer Scan* functions to more easily return async error data via Wait()
59 // See NewPointerChannelWrapper for construction / use
60 type PointerChannelWrapper struct {
61 *tools.BaseChannelWrapper
62 Results <-chan *WrappedPointer
65 // Construct a new channel wrapper for WrappedPointer
66 // Caller can use s.Results directly for normal processing then call Wait() to finish & check for errors
67 // Scan function is required to create error channel large enough not to block (usually 1 is ok)
68 func NewPointerChannelWrapper(pointerChan <-chan *WrappedPointer, errorChan <-chan error) *PointerChannelWrapper {
69 return &PointerChannelWrapper{tools.NewBaseChannelWrapper(errorChan), pointerChan}
72 // ChannelWrapper for string channel functions to more easily return async error data via Wait()
73 // Caller can use s.Results directly for normal processing then call Wait() to finish & check for errors
74 // See NewStringChannelWrapper for construction / use
75 type StringChannelWrapper struct {
76 *tools.BaseChannelWrapper
80 // Construct a new channel wrapper for string
81 // Caller can use s.Results directly for normal processing then call Wait() to finish & check for errors
82 func NewStringChannelWrapper(stringChan <-chan string, errorChan <-chan error) *StringChannelWrapper {
83 return &StringChannelWrapper{tools.NewBaseChannelWrapper(errorChan), stringChan}
86 // ChannelWrapper for TreeBlob channel functions to more easily return async error data via Wait()
87 // See NewTreeBlobChannelWrapper for construction / use
88 type TreeBlobChannelWrapper struct {
89 *tools.BaseChannelWrapper
90 Results <-chan TreeBlob
93 // Construct a new channel wrapper for TreeBlob
94 // Caller can use s.Results directly for normal processing then call Wait() to finish & check for errors
95 func NewTreeBlobChannelWrapper(treeBlobChan <-chan TreeBlob, errorChan <-chan error) *TreeBlobChannelWrapper {
96 return &TreeBlobChannelWrapper{tools.NewBaseChannelWrapper(errorChan), treeBlobChan}