Fixes: #26588
For use cases like HPC, where `podman exec` is called in rapid succession, the standard exec process can become a bottleneck due to container locking and database I/O for session tracking.
This commit introduces a new `--no-session` flag to `podman exec`. When used, this flag invokes a new, lightweight backend implementation that:
- Skips container locking, reducing lock contention
- Bypasses the creation, tracking, and removal of exec sessions in the database
- Executes the command directly and retrieves the exit code without persisting session state
- Maintains consistency with regular exec for container lookup, TTY handling, and environment setup
- Shares implementation with health check execution to avoid code duplication
The implementation addresses all performance bottlenecks while preserving compatibility with existing exec functionality including --latest flag support and proper exit code handling.
Changes include:
- Add --no-session flag to cmd/podman/containers/exec.go
- Implement lightweight execution path in libpod/container_exec.go
- Ensure consistent container validation and environment setup
- Add comprehensive exit code testing including signal handling (exit 137)
- Optimize configuration to skip unnecessary exit command setup
Signed-off-by: Ryan McCann <ryan_mccann@student.uml.edu>
Signed-off-by: ryanmccann1024 <ryan_mccann@student.uml.edu>
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>
Refactored among all files that mentioned it.
DANGER WILL ROBINSON! REVIEW CAREFULLY! Here are two major
decisions I made:
1) Look at the text for podman-run, in particular the "" text.
It currently says "will use the default". As best I can
tell this is not true, so I changed it to "will disable"
which matches all the other commands.
2) The "containers.conf" text, I decided, applies to all
commands, not just podman-run (it was only present in
podman-run). If this is not the case, please yell.
Other changes are cosmetic formatting stuff, asterisks end newlines.
Hard to review with hack/markdown-preprocess-review, because all
the text is one horrible long line instead of 80-char breaks.
Signed-off-by: Ed Santiago <santiago@redhat.com>
Another easy one. Option is only present in these three man pages.
I took the liberty of changing the "See note" text, making it
the same as --env. I also took the liberty of hyphenating
"line-delimited" because that's the correct thing to do.
Signed-off-by: Ed Santiago <santiago@redhat.com>
Only among podman create, exec, run. The same option in
podman build, generate-systemd, and secret-create is too
different.
Should be a trivial one to review, the only difference is
a period at the end of one sentence. And, of course, the
"See Environment note" applies only to podman-create and
run, not exec, so it can't be deduplicated.
Signed-off-by: Ed Santiago <santiago@redhat.com>
Three simple options shared among podman-create, exec, run.
I mostly went with the podman-run versions. For --tty, this
means that create and exec get the long stdout/stderr note.
(The example, though, remains only in podman-run). For -i,
mostly boldspace changes.
For --preserve-fds, podman-exec now has the "not with remote"
note (which it didn't until now)
Signed-off-by: Ed Santiago <santiago@redhat.com>
I chose the version from podman-run because it is the most
up-to-date, and most correct wrt current syntax guidelines.
Differences are in arg description, language, and asterisks.
Signed-off-by: Ed Santiago <santiago@redhat.com>
