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podman: new option --preserve-fd

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add a new option --preserve-fd that allows to specify a list of FDs to
pass down to the container.

It is similar to --preserve-fds but it allows to specify a list of FDs
instead of the maximum FD number to preserve.

--preserve-fd and --preserve-fds are mutually exclusive.

It requires crun since runc would complain if any fd below
--preserve-fds is not preserved.

Closes: https://github.com/containers/podman/issues/20844

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
This commit is contained in:
Giuseppe Scrivano
2023-12-01 11:49:29 +01:00
parent 6b9221d852
commit 01d397a658
19 changed files with 172 additions and 23 deletions
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4
libpod/container_exec.go
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@ -66,6 +66,9 @@ type ExecConfig struct {
// given is the number that will be passed into the exec session,
// starting at 3.
PreserveFDs uint `json:"preserveFds,omitempty"`
// PreserveFD is a list of additional file descriptors (in addition
// to 0, 1, 2) that will be passed to the executed process.
PreserveFD []uint `json:"preserveFd,omitempty"`
// ExitCommand is the exec session's exit command.
// This command will be executed when the exec session exits.
// If unset, no command will be executed.
@ -1092,6 +1095,7 @@ func prepareForExec(c *Container, session *ExecSession) (*ExecOptions, error) {
opts.Cwd = session.Config.WorkDir
opts.User = session.Config.User
opts.PreserveFDs = session.Config.PreserveFDs
opts.PreserveFD = session.Config.PreserveFD
opts.DetachKeys = session.Config.DetachKeys
opts.ExitCommand = session.Config.ExitCommand
opts.ExitCommandDelay = session.Config.ExitCommandDelay