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https://github.com/coreos/mantle.git
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f13fb5a397
cobra's PersistentPreRun's are designed such that each new one overrides all parent ones. We're using a PersistentPreRun to setup logging though, and clearly want that to cascade all the way. This adds a small helper function so each override is done by pushing a new function onto a stack rather than by replacing the previous one.
123 lines
3.5 KiB
Go
123 lines
3.5 KiB
Go
// Copyright 2014 CoreOS, Inc.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package cli
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import (
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"os"
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"github.com/coreos/pkg/capnslog"
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"github.com/spf13/cobra"
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"github.com/coreos/mantle/system/exec"
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"github.com/coreos/mantle/version"
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)
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var (
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versionCmd = &cobra.Command{
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Use: "version",
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Short: "Print the version number and exit.",
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Run: func(cmd *cobra.Command, args []string) {
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cmd.Printf("mantle/%s version %s\n",
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cmd.Root().Name(), version.Version)
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},
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}
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logDebug bool
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logVerbose bool
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logLevel = capnslog.NOTICE
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plog = capnslog.NewPackageLogger("github.com/coreos/mantle", "cli")
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)
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// Execute sets up common features that all mantle commands should share
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// and then executes the command. It does not return.
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func Execute(main *cobra.Command) {
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// If we were invoked via a multicall entrypoint run it instead.
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// TODO(marineam): should we figure out a way to initialize logging?
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exec.MaybeExec()
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main.AddCommand(versionCmd)
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// TODO(marineam): pflags defines the Value interface differently,
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// update capnslog accordingly...
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main.PersistentFlags().Var(&logLevel, "log-level",
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"Set global log level.")
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main.PersistentFlags().BoolVarP(&logVerbose, "verbose", "v", false,
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"Alias for --log-level=INFO")
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main.PersistentFlags().BoolVarP(&logDebug, "debug", "d", false,
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"Alias for --log-level=DEBUG")
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WrapPreRun(main, func(cmd *cobra.Command, args []string) error {
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startLogging(cmd)
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return nil
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})
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if err := main.Execute(); err != nil {
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plog.Fatal(err)
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}
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os.Exit(0)
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}
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func setRepoLogLevel(repo string, l capnslog.LogLevel) {
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r, err := capnslog.GetRepoLogger(repo)
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if err != nil {
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return // don't care if it isn't linked in
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}
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r.SetRepoLogLevel(l)
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}
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func startLogging(cmd *cobra.Command) {
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switch {
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case logDebug:
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logLevel = capnslog.DEBUG
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case logVerbose:
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logLevel = capnslog.INFO
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}
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capnslog.SetFormatter(capnslog.NewStringFormatter(cmd.Out()))
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capnslog.SetGlobalLogLevel(logLevel)
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// In the context of the internally linked etcd, the NOTICE messages
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// aren't really interesting, so translate NOTICE to WARNING instead.
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if logLevel == capnslog.NOTICE {
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// etcd sure has a lot of repos in its repo
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setRepoLogLevel("github.com/coreos/etcd", capnslog.WARNING)
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setRepoLogLevel("github.com/coreos/etcd/etcdserver", capnslog.WARNING)
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setRepoLogLevel("github.com/coreos/etcd/etcdserver/etcdhttp", capnslog.WARNING)
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setRepoLogLevel("github.com/coreos/etcd/pkg", capnslog.WARNING)
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}
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plog.Infof("Started logging at level %s", logLevel)
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}
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type PreRunEFunc func(cmd *cobra.Command, args []string) error
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func WrapPreRun(root *cobra.Command, f PreRunEFunc) {
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preRun, preRunE := root.PersistentPreRun, root.PersistentPreRunE
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root.PersistentPreRun, root.PersistentPreRunE = nil, nil
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root.PersistentPreRunE = func(cmd *cobra.Command, args []string) error {
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if err := f(cmd, args); err != nil {
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return err
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}
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if preRun != nil {
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preRun(cmd, args)
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} else if preRunE != nil {
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return preRunE(cmd, args)
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}
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return nil
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}
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}
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