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// Copyright 2020 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package task
import (
"context"
"fmt"
"strings"
"github.com/pingcap/errors"
"github.com/pingcap/tiup/pkg/cluster/ctxt"
)
var (
limitsFilePath = "/etc/security/limits.conf"
)
// Limit set a system limit on host
type Limit struct {
host string
domain string // user or group
limit string // limit type
item string
value string
sudo bool
}
// Execute implements the Task interface
func (l *Limit) Execute(ctx context.Context) error {
e, ok := ctxt.GetInner(ctx).GetExecutor(l.host)
if !ok {
return ErrNoExecutor
}
cmd := strings.Join([]string{
fmt.Sprintf("cp %s{,.bak} 2>/dev/null", limitsFilePath),
fmt.Sprintf("sed -i '/%s\\s*%s\\s*%s/d' %s 2>/dev/null",
l.domain, l.limit, l.item, limitsFilePath),
fmt.Sprintf("echo '%s %s %s %s' >> %s",
l.domain, l.limit, l.item, l.value, limitsFilePath),
}, " && ")
stdout, stderr, err := e.Execute(ctx, cmd, l.sudo)
ctxt.GetInner(ctx).SetOutputs(l.host, stdout, stderr)
if err != nil {
return errors.Trace(err)
}
return nil
}
// Rollback implements the Task interface
func (l *Limit) Rollback(ctx context.Context) error {
return ErrUnsupportedRollback
}
// String implements the fmt.Stringer interface
func (l *Limit) String() string {
return fmt.Sprintf("Limit: host=%s %s %s %s %s", l.host, l.domain, l.limit, l.item, l.value)
}
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