Dotfiles

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Playground for random utilities, mostly unprivileged single-user linux namespaces

Binaries

chome

Bind mount a different directory on top of $HOME to (partially) isolate a process

fakensudo

Pretend to be root (uid 0) by running in a single-user namespace mapping one's own UID to 0

keepassxc-print

Retrieve passwords from KeePassXC on the commandline via the browser interface.

overlayns

Run a command in a custom mount namespace. Like unshare -mUc with the added possibility of setting up custom mounts in the namespace before running the target application

ssh-overlay-kiosk

Create an emphemeral home directory for each invocation.

steamns

Isolate steam (and other 32-bit apps) in an unprivileged single-user-namespace "chroot"

Libraries

keepassxc-browser.hpp

Very simple library for interacting with KeePassXC's browser interface from native code

Depends on libsodium, jsoncpp, ko::proc

ko::fd

Convenient wrapper around Linux APIs with dirfd support

kofd_pipe.hpp adds a class for working with pairs of uni-directional pipes

Depends on ko::fs

ko::fs

Misc. filesystem utilities

cpath: Type that is trivially convertible to const char* and from std::string and std::filesystem::path
dir_ptr: Convenient iterator-based wrapper around the dirent API

ko::ns

Utilities for working with Linux Namespaces (unshare, clone, setns)

Depends on ko::util, ko::fd, ko::os

ko::ns::idmap: Functions for writing /proc/$$/Xidmap
ko::ns::mount: Functions for setting up mount namespaces
ko::ns::clone: Helpers for spawning processes in new namespaces (kons_clone.hpp, requires ko::proc)

ko::os

Misc. OS helpers

Depends on ko:: fs

get_home()
is_mountpoint()

ko::proc

Utilities for spawning and managing child processes

Depends on pthread, ko::fd

popen[p]: Spawn subprocess and communicate via pipes
sync::semapair: Synchronization across processes
child_ref: Child process reference with cleanup
[s]vclone: Wrappers around linux clone(CLONE_VM)
simple_spawn: Trivial fork(); execvp() primitive

ko::util

Misc. utilities

str: Type-safe-ly concatenate all arguments
cvshort: Short-circuit continuation using C-Style return codes

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