98 lines
4.2 KiB
Go
98 lines
4.2 KiB
Go
package lfs
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import "github.com/git-lfs/git-lfs/tools"
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const (
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// blobSizeCutoff is used to determine which files to scan for Git LFS
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// pointers. Any file with a size below this cutoff will be scanned.
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blobSizeCutoff = 1024
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// stdoutBufSize is the size of the buffers given to a sub-process stdout
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stdoutBufSize = 16384
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// chanBufSize is the size of the channels used to pass data from one
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// sub-process to another.
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chanBufSize = 100
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)
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// WrappedPointer wraps a pointer.Pointer and provides the git sha1
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// and the file name associated with the object, taken from the
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// rev-list output.
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type WrappedPointer struct {
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Sha1 string
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Name string
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SrcName string
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Status string
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*Pointer
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}
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// catFileBatchCheck uses git cat-file --batch-check to get the type
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// and size of a git object. Any object that isn't of type blob and
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// under the blobSizeCutoff will be ignored. revs is a channel over
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// which strings containing git sha1s will be sent. It returns a channel
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// from which sha1 strings can be read.
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func catFileBatchCheck(revs *StringChannelWrapper, lockableSet *lockableNameSet) (*StringChannelWrapper, chan string, error) {
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smallRevCh := make(chan string, chanBufSize)
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lockableCh := make(chan string, chanBufSize)
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errCh := make(chan error, 2) // up to 2 errors, one from each goroutine
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if err := runCatFileBatchCheck(smallRevCh, lockableCh, lockableSet, revs, errCh); err != nil {
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return nil, nil, err
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}
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return NewStringChannelWrapper(smallRevCh, errCh), lockableCh, nil
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}
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// catFileBatch uses git cat-file --batch to get the object contents
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// of a git object, given its sha1. The contents will be decoded into
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// a Git LFS pointer. revs is a channel over which strings containing Git SHA1s
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// will be sent. It returns a channel from which point.Pointers can be read.
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func catFileBatch(revs *StringChannelWrapper, lockableSet *lockableNameSet) (*PointerChannelWrapper, chan string, error) {
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pointerCh := make(chan *WrappedPointer, chanBufSize)
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lockableCh := make(chan string, chanBufSize)
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errCh := make(chan error, 5) // shared by 2 goroutines & may add more detail errors?
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if err := runCatFileBatch(pointerCh, lockableCh, lockableSet, revs, errCh); err != nil {
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return nil, nil, err
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}
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return NewPointerChannelWrapper(pointerCh, errCh), lockableCh, nil
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}
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// ChannelWrapper for pointer Scan* functions to more easily return async error data via Wait()
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// See NewPointerChannelWrapper for construction / use
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type PointerChannelWrapper struct {
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*tools.BaseChannelWrapper
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Results <-chan *WrappedPointer
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}
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// Construct a new channel wrapper for WrappedPointer
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// Caller can use s.Results directly for normal processing then call Wait() to finish & check for errors
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// Scan function is required to create error channel large enough not to block (usually 1 is ok)
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func NewPointerChannelWrapper(pointerChan <-chan *WrappedPointer, errorChan <-chan error) *PointerChannelWrapper {
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return &PointerChannelWrapper{tools.NewBaseChannelWrapper(errorChan), pointerChan}
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}
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// ChannelWrapper for string channel functions to more easily return async error data via Wait()
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// Caller can use s.Results directly for normal processing then call Wait() to finish & check for errors
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// See NewStringChannelWrapper for construction / use
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type StringChannelWrapper struct {
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*tools.BaseChannelWrapper
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Results <-chan string
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}
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// Construct a new channel wrapper for string
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// Caller can use s.Results directly for normal processing then call Wait() to finish & check for errors
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func NewStringChannelWrapper(stringChan <-chan string, errorChan <-chan error) *StringChannelWrapper {
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return &StringChannelWrapper{tools.NewBaseChannelWrapper(errorChan), stringChan}
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}
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// ChannelWrapper for TreeBlob channel functions to more easily return async error data via Wait()
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// See NewTreeBlobChannelWrapper for construction / use
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type TreeBlobChannelWrapper struct {
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*tools.BaseChannelWrapper
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Results <-chan TreeBlob
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}
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// Construct a new channel wrapper for TreeBlob
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// Caller can use s.Results directly for normal processing then call Wait() to finish & check for errors
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func NewTreeBlobChannelWrapper(treeBlobChan <-chan TreeBlob, errorChan <-chan error) *TreeBlobChannelWrapper {
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return &TreeBlobChannelWrapper{tools.NewBaseChannelWrapper(errorChan), treeBlobChan}
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}
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