136 lines
2.6 KiB
Go
136 lines
2.6 KiB
Go
/*
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Copyright (c) 2016 VMware, Inc. All Rights Reserved.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package datastore
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import (
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"context"
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"flag"
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"io"
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"os"
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"time"
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"github.com/vmware/govmomi/govc/cli"
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"github.com/vmware/govmomi/govc/flags"
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)
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type tail struct {
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*flags.DatastoreFlag
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*flags.HostSystemFlag
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count int64
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lines int
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follow bool
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}
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func init() {
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cli.Register("datastore.tail", &tail{})
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}
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func (cmd *tail) Register(ctx context.Context, f *flag.FlagSet) {
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cmd.DatastoreFlag, ctx = flags.NewDatastoreFlag(ctx)
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cmd.DatastoreFlag.Register(ctx, f)
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cmd.HostSystemFlag, ctx = flags.NewHostSystemFlag(ctx)
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cmd.HostSystemFlag.Register(ctx, f)
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f.Int64Var(&cmd.count, "c", -1, "Output the last NUM bytes")
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f.IntVar(&cmd.lines, "n", 10, "Output the last NUM lines")
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f.BoolVar(&cmd.follow, "f", false, "Output appended data as the file grows")
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}
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func (cmd *tail) Description() string {
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return `Output the last part of datastore files.
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Examples:
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govc datastore.tail -n 100 vm-name/vmware.log
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govc datastore.tail -n 0 -f vm-name/vmware.log`
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}
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func (cmd *tail) Process(ctx context.Context) error {
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if err := cmd.DatastoreFlag.Process(ctx); err != nil {
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return err
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}
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if err := cmd.HostSystemFlag.Process(ctx); err != nil {
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return err
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}
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return nil
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}
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func (cmd *tail) Usage() string {
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return "PATH"
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}
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func (cmd *tail) Run(ctx context.Context, f *flag.FlagSet) error {
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if f.NArg() != 1 {
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return flag.ErrHelp
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}
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ds, err := cmd.Datastore()
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if err != nil {
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return err
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}
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h, err := cmd.HostSystemIfSpecified()
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if err != nil {
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return err
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}
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if h != nil {
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ctx = ds.HostContext(ctx, h)
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}
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file, err := ds.Open(ctx, f.Arg(0))
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if err != nil {
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return err
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}
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var reader io.ReadCloser = file
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var offset int64
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if cmd.count >= 0 {
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info, serr := file.Stat()
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if serr != nil {
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return serr
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}
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if info.Size() > cmd.count {
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offset = info.Size() - cmd.count
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_, err = file.Seek(offset, io.SeekStart)
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if err != nil {
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return err
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}
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}
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} else if cmd.lines >= 0 {
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err = file.Tail(cmd.lines)
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if err != nil {
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return err
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}
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}
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if cmd.follow {
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reader = file.Follow(time.Second)
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}
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_, err = io.Copy(os.Stdout, reader)
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_ = reader.Close()
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return err
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}
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