Man pages: refactor common options: authfile

Refactor the --authfile option.

My suggestion for review:
  1) run hack/markdown-preprocess-review and immediately Ctrl-Q to
     quit out of diffuse, which is completely unusable for this
     many files; then
  2) cd /tmp/markdown-preprocess-review.diffs/authfile
     - this is the directory created by the review script
  3) rm podman-image-sign* podman-log* podman-search.1.md.in
     - because they're essentially identical to podman-create
  4) rm podman-manifest-* podman-push.*
     - because they're 100% identical to podman-kube-play
  5) rm podman-kube-play*
     - because it's apart-from-whitespace identical to podman-build
       (use "wdiff" to confirm)
  6) rm podman-auto-update*
     - because that's the one I chose (hence == zzz-chosen.md)

(You should obviously run your own diff/cmp before rm, to confirm
my assertions about which files are identical).

After all that, you have a manageable number of files which
you can scan, read, diff against zzz-chosen.md, even run diffuse.

This option is IMHO the poster child for why we need this kind
of man page refactoring.

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

1 files changed, 55 insertions, 0 deletions

diff --git a/docs/source/markdown/podman-logout.1.md.in b/docs/source/markdown/podman-logout.1.md.in
new file mode 100644
index 000000000..6997bb36e
--- /dev/null
+++ b/docs/source/markdown/podman-logout.1.md.in
@@ -0,0 +1,55 @@
+% podman-logout(1)
+
+## NAME
+podman\-logout - Logout of a container registry
+
+## SYNOPSIS
+**podman logout** [*options*] *registry*
+
+## DESCRIPTION
+**podman logout** logs out of a specified registry server by deleting the cached credentials
+stored in the **auth.json** file. If the registry is not specified, the first registry under [registries.search]
+from registries.conf will be used. The path of the authentication file can be overridden by the user by setting the **authfile** flag.
+The default path used is **${XDG\_RUNTIME\_DIR}/containers/auth.json**. For more details about format and configurations of the auth,json file, please refer to containers-auth.json(5)
+All the cached credentials can be removed by setting the **all** flag.
+
+**podman [GLOBAL OPTIONS]**
+
+**podman logout [GLOBAL OPTIONS]**
+
+**podman logout [OPTIONS] REGISTRY [GLOBAL OPTIONS]**
+
+## OPTIONS
+
+#### **--all**, **-a**
+
+Remove the cached credentials for all registries in the auth file
+
+@@option authfile
+
+#### **--help**, **-h**
+
+Print usage statement
+
+## EXAMPLES
+
+```
+$ podman logout docker.io
+Remove login credentials for https://registry-1.docker.io/v2/
+```
+
+```
+$ podman logout --authfile authdir/myauths.json docker.io
+Remove login credentials for https://registry-1.docker.io/v2/
+```
+
+```
+$ podman logout --all
+Remove login credentials for all registries
+```
+
+## SEE ALSO
+**[podman(1)](podman.1.md)**, **[podman-login(1)](podman-login.1.md)**, **[containers-auth.json(5)](https://github.com/containers/image/blob/main/docs/containers-auth.json.5.md)**
+
+## HISTORY
+August 2017, Originally compiled by Urvashi Mohnani <umohnani@redhat.com>