mirror of https://github.com/harness/drone.git
92 lines
2.3 KiB
Go
92 lines
2.3 KiB
Go
// Copyright 2023 Harness, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package adapter
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import (
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"context"
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"fmt"
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"io"
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"github.com/harness/gitness/errors"
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"github.com/harness/gitness/git/types"
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"code.gitea.io/gitea/modules/git"
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)
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// GetBlob returns the blob for the given object sha.
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func (a Adapter) GetBlob(
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ctx context.Context,
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repoPath string,
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sha string,
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sizeLimit int64,
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) (*types.BlobReader, error) {
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stdIn, stdOut, cancel := git.CatFileBatch(ctx, repoPath)
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_, err := stdIn.Write([]byte(sha + "\n"))
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if err != nil {
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cancel()
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return nil, fmt.Errorf("failed to write blob sha to git stdin: %w", err)
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}
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objectSHA, objectType, objectSize, err := git.ReadBatchLine(stdOut)
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if err != nil {
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cancel()
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return nil, processGiteaErrorf(err, "failed to read cat-file batch line")
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}
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if string(objectSHA) != sha {
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cancel()
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return nil, fmt.Errorf("cat-file returned object sha '%s' but expected '%s'", objectSHA, sha)
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}
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if objectType != string(git.ObjectBlob) {
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cancel()
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return nil, errors.InvalidArgument(
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"cat-file returned object type '%s' but expected '%s'", objectType, git.ObjectBlob)
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}
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contentSize := objectSize
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if sizeLimit > 0 && sizeLimit < contentSize {
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contentSize = sizeLimit
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}
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return &types.BlobReader{
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SHA: sha,
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Size: objectSize,
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ContentSize: contentSize,
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Content: newLimitReaderCloser(stdOut, contentSize, cancel),
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}, nil
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}
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func newLimitReaderCloser(reader io.Reader, limit int64, stop func()) limitReaderCloser {
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return limitReaderCloser{
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reader: io.LimitReader(reader, limit),
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stop: stop,
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}
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}
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type limitReaderCloser struct {
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reader io.Reader
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stop func()
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}
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func (l limitReaderCloser) Read(p []byte) (n int, err error) {
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return l.reader.Read(p)
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}
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func (l limitReaderCloser) Close() error {
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l.stop()
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return nil
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}
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