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main.go
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main.go
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// Copyright (c) 2019 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package main
import (
"fmt"
"io"
"log"
"os"
"strconv"
)
// Shards a list of files over a distribution defined by totalShards.
// Useful for splitting work and running tests in parallel.
var usage = fmt.Sprintf("Usage: %s shardNum totalShards args...", os.Args[0])
func main() {
if err := do(os.Args[1:], os.Stdout); err != nil {
log.Fatal(err)
}
}
func do(args []string, writer io.Writer) error {
if len(args) < 2 {
return fmt.Errorf(usage)
}
shardNum, err := strconv.Atoi(args[0])
if err != nil {
return fmt.Errorf("%v\n%s", err, usage)
}
totalShards, err := strconv.Atoi(args[1])
if err != nil {
return fmt.Errorf("%v\n%s", err, usage)
}
for i := 2; i < len(args); i++ {
if (((i - 2) % totalShards) + 1) == shardNum {
if i != 2 {
fmt.Fprint(writer, " ")
}
fmt.Fprint(writer, args[i])
}
}
return nil
}