limit_darwin.go (2363B)
1 // Copyright 2018 The Hugo Authors. All rights reserved.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 // http://www.apache.org/licenses/LICENSE-2.0
7 //
8 // Unless required by applicable law or agreed to in writing, software
9 // distributed under the License is distributed on an "AS IS" BASIS,
10 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
11 // See the License for the specific language governing permissions and
12 // limitations under the License.
13
14 package commands
15
16 import (
17 "syscall"
18
19 "github.com/spf13/cobra"
20 jww "github.com/spf13/jwalterweatherman"
21 )
22
23 var _ cmder = (*limitCmd)(nil)
24
25 type limitCmd struct {
26 *baseCmd
27 }
28
29 func newLimitCmd() *limitCmd {
30 ccmd := &cobra.Command{
31 Use: "ulimit",
32 Short: "Check system ulimit settings",
33 Long: `Hugo will inspect the current ulimit settings on the system.
34 This is primarily to ensure that Hugo can watch enough files on some OSs`,
35 RunE: func(cmd *cobra.Command, args []string) error {
36 var rLimit syscall.Rlimit
37 err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit)
38 if err != nil {
39 return newSystemError("Error Getting rlimit ", err)
40 }
41
42 jww.FEEDBACK.Println("Current rLimit:", rLimit)
43
44 if rLimit.Cur >= newRlimit {
45 return nil
46 }
47
48 jww.FEEDBACK.Println("Attempting to increase limit")
49 rLimit.Cur = newRlimit
50 err = syscall.Setrlimit(syscall.RLIMIT_NOFILE, &rLimit)
51 if err != nil {
52 return newSystemError("Error Setting rLimit ", err)
53 }
54 err = syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit)
55 if err != nil {
56 return newSystemError("Error Getting rLimit ", err)
57 }
58 jww.FEEDBACK.Println("rLimit after change:", rLimit)
59
60 return nil
61 },
62 }
63
64 return &limitCmd{baseCmd: newBaseCmd(ccmd)}
65 }
66
67 const newRlimit = 10240
68
69 func tweakLimit() {
70 var rLimit syscall.Rlimit
71 err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit)
72 if err != nil {
73 jww.WARN.Println("Unable to get rlimit:", err)
74 return
75 }
76 if rLimit.Cur < newRlimit {
77 rLimit.Cur = newRlimit
78 err = syscall.Setrlimit(syscall.RLIMIT_NOFILE, &rLimit)
79 if err != nil {
80 // This may not succeed, see https://github.com/golang/go/issues/30401
81 jww.INFO.Println("Unable to increase number of open files limit:", err)
82 }
83 }
84 }