Usage messages: deduplicate '(default true)' et al

Remove hardcoded '(default: true)' strings from bool flags,
and '(default this-or-that)' from string flags.

First because it's unmaintainable duplication that would cause
confusion should someone ever change the default and not notice
the message.

Second, because cobra[1] already prints '(default XXXX)' for
all options with non-false non-nil default. So in each of
these cases, current podman help behavior is:

    $ podman login --help
    ...
       --tls-verify  Require HTTPS ... (default: true) (default true)

This PR eliminates that duplication.

 [1] actually spf13/pflag/flag.go

The only nontrivial one of these is start.go, where the default
for sigProxy depends on the --attach flag. Solution: change
the command-line default to false, and implement the new
conditional default in logic. Bonus: removed unnecessary
check, because now if sigProxy is set without --attach,
we can guarantee that it was done by the user. But please
pay close scrutiny to this particular section in case
there's something I missed.

Signed-off-by: Ed Santiago <santiago@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/cmd/podman/export.go b/cmd/podman/export.go
index e5dc410a7..881215e88 100644
--- a/cmd/podman/export.go
+++ b/cmd/podman/export.go
@@ -36,7 +36,7 @@ func init() {
 	exportCommand.SetHelpTemplate(HelpTemplate())
 	exportCommand.SetUsageTemplate(UsageTemplate())
 	flags := exportCommand.Flags()
-	flags.StringVarP(&exportCommand.Output, "output", "o", "/dev/stdout", "Write to a file, default is STDOUT")
+	flags.StringVarP(&exportCommand.Output, "output", "o", "/dev/stdout", "Write to a file instead of terminal")
 }
 
 // exportCmd saves a container to a tarball on disk