Add U volume flag to chown source volumes

Signed-off-by: Eduardo Vega <edvegavalerio@gmail.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/docs/source/markdown/podman-run.1.md b/docs/source/markdown/podman-run.1.md
index 8c0b12e90..a633df94e 100644
--- a/docs/source/markdown/podman-run.1.md
+++ b/docs/source/markdown/podman-run.1.md
@@ -1111,6 +1111,7 @@ The _options_ is a comma delimited list and can be: <sup>[[1]](#Footnote1)</sup>
 * [**no**]**dev**
 * [**no**]**suid**
 * [**O**]
+* [**U**]
 
 The `CONTAINER-DIR` must be an absolute path such as `/src/docs`. The volume
 will be mounted into the container at this directory.
@@ -1139,6 +1140,14 @@ container.
 You can add **:ro** or **:rw** option to mount a volume in read-only or
 read-write mode, respectively. By default, the volumes are mounted read-write.
 
+  `Chowning Volume Mounts`
+
+By default, Podman does not change the owner and group of source volume directories mounted into containers. If a container is created in a new user namespace, the UID and GID in the container may correspond to another UID and GID on the host.
+
+The `:U` suffix tells Podman to use the correct host UID and GID based on the UID and GID within the container, to change recursively the owner and group of the source volume.
+
+**Warning** use with caution since this will modify the host filesystem.
+
   `Labeling Volume Mounts`
 
 Labeling systems like SELinux require that proper labels are placed on volume
@@ -1450,6 +1459,8 @@ $ podman run -v /var/db:/data1 -i -t fedora bash
 $ podman run -v data:/data2 -i -t fedora bash
 
 $ podman run -v /var/cache/dnf:/var/cache/dnf:O -ti fedora dnf -y update
+
+$ podman run -d -e MYSQL_ROOT_PASSWORD=root --user mysql --userns=keep-id -v ~/data:/var/lib/mysql:z,U mariadb
 ```
 
 Using **--mount** flags to mount a host directory as a container folder, specify