// Copyright 2019 The Prometheus Authors // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. package util import ( "io" "os" ) // ReadFileNoStat uses io.ReadAll to read contents of entire file. // This is similar to os.ReadFile but without the call to os.Stat, because // many files in /proc and /sys report incorrect file sizes (either 0 or 4096). // Reads a max file size of 1024kB. For files larger than this, a scanner // should be used. func ReadFileNoStat(filename string) ([]byte, error) { const maxBufferSize = 1024 * 1024 f, err := os.Open(filename) if err != nil { return nil, err } defer f.Close() reader := io.LimitReader(f, maxBufferSize) return io.ReadAll(reader) }