How can I supply a heredoc to podman run?

Question

When I run buildah, I typically use a heredoc,

ctr=$(buildah from alpine:3);

buildah run $ctr sh -- <<EOF
  apk update;
  apk add git;
EOF

buildah commit $ctr heredoc_demo;

However, when I try to do the same thing with podman, I get an error like this,

WARN[0000] The input device is not a TTY. The --tty and --interactive flags might not work properly

Which you can get with,

❯ podman run -ti alpine:3 sh -- <<EOF
  echo 42
EOF
WARN[0000] The input device is not a TTY. The `--tty` and `--interactive` flags might not work properly

Or nothing happens as with

podman run alpine:3 sh <<EOF

What is the right invocation here?

Answer 1

You have two options, note:

• do not use -t (--tty)
• do use an -i (--interactive)

This looks like this,

podman run -i heredoc_demo sh -- <<EOF
    echo "Hello world";
EOF

Or,

cat <<EOF | podman run -i heredoc_demo sh -
    echo "Hello world";
EOF