コード例 #1
0
ファイル: command_checkout.go プロジェクト: hoolio/git-lfs
// Populate the working copy with the real content of objects where the file is
// either missing, or contains a matching pointer placeholder, from a list of pointers.
// If the file exists but has other content it is left alone
func checkoutWithChan(in <-chan *lfs.WrappedPointer) {
	// Fire up the update-index command
	cmd := exec.Command("git", "update-index", "-q", "--refresh", "--stdin")
	updateIdxStdin, err := cmd.StdinPipe()
	if err != nil {
		Panic(err, "Could not update the index")
	}

	if err := cmd.Start(); err != nil {
		Panic(err, "Could not update the index")
	}

	// Get a converter from repo-relative to cwd-relative
	// Since writing data & calling git update-index must be relative to cwd
	repopathchan := make(chan string, 1)
	cwdpathchan, err := lfs.ConvertRepoFilesRelativeToCwd(repopathchan)
	if err != nil {
		Panic(err, "Could not convert file paths")
	}

	// As files come in, write them to the wd and update the index
	for pointer := range in {

		// Check the content - either missing or still this pointer (not exist is ok)
		filepointer, err := lfs.DecodePointerFromFile(pointer.Name)
		if err != nil && !os.IsNotExist(err) {
			if err == lfs.NotAPointerError {
				// File has non-pointer content, leave it alone
				continue
			}
			Panic(err, "Problem accessing %v", pointer.Name)
		}
		if filepointer != nil && filepointer.Oid != pointer.Oid {
			// User has probably manually reset a file to another commit
			// while leaving it a pointer; don't mess with this
			continue
		}
		// OK now we can (over)write the file content
		repopathchan <- pointer.Name
		cwdfilepath := <-cwdpathchan
		err = lfs.PointerSmudgeToFile(cwdfilepath, pointer.Pointer, nil)
		if err != nil {
			Panic(err, "Could not checkout file")
		}

		updateIdxStdin.Write([]byte(cwdfilepath + "\n"))
	}
	close(repopathchan)

	updateIdxStdin.Close()
	if err := cmd.Wait(); err != nil {
		Panic(err, "Error updating the git index")
	}

}
コード例 #2
0
// Populate the working copy with the real content of objects where the file is
// either missing, or contains a matching pointer placeholder, from a list of pointers.
// If the file exists but has other content it is left alone
// Callers of this function MUST NOT Panic or otherwise exit the process
// without waiting for this function to shut down.  If the process exits while
// update-index is in the middle of processing a file the git index can be left
// in a locked state.
func checkoutWithChan(in <-chan *lfs.WrappedPointer) {
	// Get a converter from repo-relative to cwd-relative
	// Since writing data & calling git update-index must be relative to cwd
	repopathchan := make(chan string, 1)
	cwdpathchan, err := lfs.ConvertRepoFilesRelativeToCwd(repopathchan)
	if err != nil {
		Panic(err, "Could not convert file paths")
	}

	// Don't fire up the update-index command until we have at least one file to
	// give it. Otherwise git interprets the lack of arguments to mean param-less update-index
	// which can trigger entire working copy to be re-examined, which triggers clean filters
	// and which has unexpected side effects (e.g. downloading filtered-out files)
	var cmd *exec.Cmd
	var updateIdxStdin io.WriteCloser

	// From this point on, git update-index is running. Code in this loop MUST
	// NOT Panic() or otherwise cause the process to exit. If the process exits
	// while update-index is in the middle of updating, the index can remain in a
	// locked state.

	// As files come in, write them to the wd and update the index
	for pointer := range in {

		// Check the content - either missing or still this pointer (not exist is ok)
		filepointer, err := lfs.DecodePointerFromFile(pointer.Name)
		if err != nil && !os.IsNotExist(err) {
			if err == lfs.NotAPointerError {
				// File has non-pointer content, leave it alone
				continue
			}
			LoggedError(err, "Problem accessing %v", pointer.Name)
			continue
		}

		if filepointer != nil && filepointer.Oid != pointer.Oid {
			// User has probably manually reset a file to another commit
			// while leaving it a pointer; don't mess with this
			continue
		}

		repopathchan <- pointer.Name
		cwdfilepath := <-cwdpathchan

		err = lfs.PointerSmudgeToFile(cwdfilepath, pointer.Pointer, false, nil)
		if err != nil {
			if err == lfs.DownloadDeclinedError {
				// acceptable error, data not local (fetch not run or include/exclude)
				LoggedError(err, "Skipped checkout for %v, content not local. Use fetch to download.", pointer.Name)
			} else {
				LoggedError(err, "Could not checkout file")
				continue
			}
		}

		if cmd == nil {
			// Fire up the update-index command
			cmd = exec.Command("git", "update-index", "-q", "--refresh", "--stdin")
			updateIdxStdin, err = cmd.StdinPipe()
			if err != nil {
				Panic(err, "Could not update the index")
			}

			if err := cmd.Start(); err != nil {
				Panic(err, "Could not update the index")
			}

		}

		updateIdxStdin.Write([]byte(cwdfilepath + "\n"))
	}
	close(repopathchan)

	if cmd != nil && updateIdxStdin != nil {
		updateIdxStdin.Close()
		if err := cmd.Wait(); err != nil {
			Panic(err, "Error updating the git index")
		}
	}
}