61 lines
1.8 KiB
Go
61 lines
1.8 KiB
Go
// Copyright 2026 The gVisor Authors.
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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 log
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import (
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"fmt"
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"os"
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"path/filepath"
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)
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// FileOpts contains options for creating a log file.
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type FileOpts interface {
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// Build constructs the log file path based on the given pattern.
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Build(logPattern string) string
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}
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// DefaultFileOpts is the default implementation of FileOpts which supports no
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// variable substitution.
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type DefaultFileOpts struct{}
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// Build implements FileOpts.Build.
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func (f *DefaultFileOpts) Build(logPattern string) string {
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return logPattern
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}
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// OpenFile opens a log file using the specified flags. It uses `opts` to
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// construct the log file path based on the given `logPattern`.
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func OpenFile(logPattern string, flags int, opts FileOpts) (*os.File, error) {
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if len(logPattern) == 0 {
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return nil, nil
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}
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// Replace variables in the log pattern.
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logPath := opts.Build(logPattern)
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// Create parent directory if it doesn't exist.
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dir := filepath.Dir(logPath)
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if err := os.MkdirAll(dir, 0755); err != nil {
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return nil, fmt.Errorf("error creating dir %q: %v", dir, err)
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}
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// Open file with the specified flags.
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f, err := os.OpenFile(logPath, flags, 0644)
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if err != nil {
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return nil, fmt.Errorf("error opening file %q: %v", logPath, err)
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}
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return f, nil
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}
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