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auto-update: add --dry-run

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Add a --dry-run flag to `podman auto-update` which will look for new
images but won't perform any pull or restart any service or container.

The "UPDATED" column will now indicate the availability of a newer image
via "pending".

```
$ podman auto-update --dry-run
UNIT                    CONTAINER            IMAGE                   POLICY      UPDATED
container-test.service  08fd34e533fd (test)  localhost:5000/busybox  registry    false
```

Fixes: #9949
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
This commit is contained in:
Valentin Rothberg
2021-07-15 11:27:25 +02:00
parent 1568247ec8
commit 59f31d86ac
6 changed files with 45 additions and 23 deletions
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2
cmd/podman/auto-update.go
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@@ -53,6 +53,8 @@ func init() {
flags.StringVar(&autoUpdateOptions.Authfile, authfileFlagName, auth.GetDefaultAuthFile(), "Path to the authentication file. Use REGISTRY_AUTH_FILE environment variable to override")
_ = autoUpdateCommand.RegisterFlagCompletionFunc(authfileFlagName, completion.AutocompleteDefault)
flags.BoolVar(&autoUpdateOptions.DryRun, "dry-run", false, "Check for pending updates")
flags.StringVar(&autoUpdateOptions.format, "format", "", "Change the output format to JSON or a Go template")
_ = autoUpdateCommand.RegisterFlagCompletionFunc("format", common.AutocompleteFormat(autoUpdateOutput{}))
}