Pros of sshuttle

• sshuttle provides a simple and effective way to create a VPN-like tunnel without the need for a VPN server, making it a convenient solution for remote access.
• sshuttle supports a wide range of platforms, including Linux, macOS, and Windows, making it a versatile tool.
• sshuttle can be used to bypass firewalls and access resources that might otherwise be restricted.

Cons of sshuttle

• sshuttle requires the installation of Python and its dependencies, which may not be available on all systems.
• sshuttle's performance may be affected by network latency and bandwidth limitations, as it relies on a proxy-based approach.
• sshuttle may not provide the same level of security and encryption as a traditional VPN solution.

Code Comparison

su-exec:

int main(int argc, char *argv[]) {
    if (argc < 2) {
        fprintf(stderr, "usage: %s <user> [args...]\n", argv[0]);
        return 1;
    }

    const char *user = argv[1];
    char **args = argv + 2;

    if (setgid(getpwnam(user)->pw_gid) != 0) {
        fprintf(stderr, "setgid(%s): %s\n", user, strerror(errno));
        return 1;
    }
    if (setuid(getpwnam(user)->pw_uid) != 0) {
        fprintf(stderr, "setuid(%s): %s\n", user, strerror(errno));
        return 1;
    }

    execvp(args[0], args);
    fprintf(stderr, "exec(%s): %s\n", args[0], strerror(errno));
    return 1;
}

sshuttle:

def main():
    parser = OptionParser()
    parser.add_option("-r", "--remote", dest="remote", default=None,
                      help="Remote host to connect to (user@host:port)")
    parser.add_option("-H", "--auto-hosts", action="store_true",
                      dest="auto_hosts", default=False,
                      help="Automatically add new hosts to /etc/hosts")
    parser.add_option("-N", "--auto-nets", action="store_true",
                      dest="auto_nets", default=False,
                      help="Automatically add new routes")
    parser.add_option("-x", "--exclude", action="append", dest="exclude",
                      default=[], help="Exclude these networks")
    parser.add_option("-v", "--verbose", action="store_true", dest="verbose",
                      default=False, help="Verbose mode")
    (options, args) = parser.parse_args()

Pros of Tini

• Tini is a lightweight and simple init system that helps with signal forwarding and process management in Docker containers.
• Tini provides a simple and effective way to handle signals and ensure that all child processes are properly terminated when the main process exits.
• Tini is widely used and well-supported, with a large community and active development.

Cons of Tini

• Tini may have a slightly higher overhead compared to su-exec, as it is a separate process that runs alongside the main application.
• Tini may not be as lightweight as su-exec, which is a single-purpose utility.

Code Comparison

su-exec:

int main(int argc, char *argv[]) {
    if (argc < 3) {
        fprintf(stderr, "usage: %s user[:group] command [args...]\n", argv[0]);
        return 1;
    }

    const char *user = argv[1];
    char *command = argv[2];
    char **args = argv + 3;
    return su_exec(user, command, args);
}

Tini:

int main(int argc, char *argv[]) {
    if (argc < 2) {
        fprintf(stderr, "usage: %s [--] [COMMAND [ARG...]]\n", argv[0]);
        return 1;
    }

    int tini_argc = argc - 1;
    char **tini_argv = argv + 1;

    return tini_main(tini_argc, tini_argv);
}

Pros of Yelp/dumb-init

• Provides a simple and lightweight init system for Docker containers, ensuring proper signal handling and process management.
• Supports running multiple processes within a single container, making it easier to manage complex applications.
• Offers a straightforward and easy-to-use interface, with minimal configuration required.

Cons of Yelp/dumb-init

• May not provide the same level of flexibility and control as more feature-rich init systems like ncopa/su-exec.
• Lacks some of the advanced features and customization options available in ncopa/su-exec.
• May not be suitable for highly complex or specialized use cases that require more advanced process management capabilities.

Code Comparison

Here's a brief comparison of the code for ncopa/su-exec and Yelp/dumb-init:

ncopa/su-exec:

int main(int argc, char *argv[]) {
    if (argc < 2) {
        fprintf(stderr, "usage: %s <user[:group]> command [args...]\n", argv[0]);
        return 1;
    }

    char *user = argv[1];
    char *cmd = argv[2];
    char **args = argv + 2;

    return su_exec(user, cmd, args);
}

Yelp/dumb-init:

def run_child(args):
    try:
        os.execvp(args[0], args)
    except OSError as e:
        sys.stderr.write('dumb-init: exec() failed: {}\n'.format(e))
        sys.exit(1)

def main():
    args = sys.argv[1:]
    if not args:
        sys.stderr.write('dumb-init: no command given\n')
        sys.exit(1)

    try:
        signal.signal(signal.SIGTERM, handle_signal)
        signal.signal(signal.SIGINT, handle_signal)
        run_child(args)
    except KeyboardInterrupt:
        pass

Pros of FPM

• FPM supports a wide range of package formats, including RPM, DEB, Solaris, and more, making it a versatile tool for packaging applications.
• FPM provides a simple and intuitive command-line interface, allowing users to quickly create packages without complex configuration.
• FPM includes features like dependency management, package versioning, and metadata customization, which can simplify the packaging process.

Cons of FPM

• FPM may have a steeper learning curve compared to su-exec, as it offers more advanced features and configuration options.
• FPM's flexibility can also lead to increased complexity, which may be a drawback for users who require a more streamlined packaging solution.

Code Comparison

su-exec:

int main(int argc, char *argv[]) {
    if (argc < 2) {
        fprintf(stderr, "usage: %s <user[:group]> <command> [args...]\n", argv[0]);
        return 1;
    }

    char *user = argv[1];
    char *cmd = argv[2];
    char **args = argv + 3;

FPM:

def input(name)
  @inputs[name.to_sym] || @inputs[name.to_s]
end

def output(name)
  @outputs[name.to_sym] || @outputs[name.to_s]
end

def filter(name)
  @filters[name.to_sym] || @filters[name.to_s]
end

Pros of wait-for-it

• Flexibility: wait-for-it provides a flexible and customizable way to wait for a TCP host/port to become available, making it suitable for a variety of use cases.
• Portability: The script is written in POSIX-compliant Bash, ensuring it can be used on a wide range of Unix-like systems.
• Timeout Handling: wait-for-it includes a built-in timeout mechanism, allowing you to specify a maximum wait time before the script exits.

Cons of wait-for-it

• Limited Functionality: wait-for-it is primarily focused on waiting for a TCP host/port, and may not provide the same level of functionality as su-exec for tasks like user switching or privilege escalation.
• Dependency on Bash: The script requires Bash, which may not be available on all systems, particularly Windows environments.
• Lack of Active Maintenance: The wait-for-it project appears to have less active maintenance compared to su-exec, with the last commit being over a year ago.

Code Comparison

su-exec:

int main(int argc, char *argv[]) {
    if (argc < 3) {
        fprintf(stderr, "usage: %s user[:group] command [args...]\n", argv[0]);
        return 1;
    }

    const char *user = argv[1];
    char *cmd = argv[2];
    char **args = argv + 2;

wait-for-it:

#!/usr/bin/env bash
# Use this script to test if a given TCP host/port are available

WAITFORIT_cmdname=${0##*/}

echoerr() { if [[ $WAITFORIT_QUIET -ne 1 ]]; then echo "$@" 1>&2; fi }

Pros of jwilder/dockerize

• Provides a more comprehensive set of features, including support for environment variable substitution, template rendering, and command execution.
• Allows for more complex configuration and customization of the container environment.
• Offers a wider range of use cases beyond just switching user IDs.

Cons of jwilder/dockerize

• May have a larger footprint and dependencies compared to the more lightweight ncopa/su-exec.
• Can be more complex to configure and use, especially for simpler use cases.
• May have a steeper learning curve compared to the more straightforward ncopa/su-exec.

Code Comparison

ncopa/su-exec:

int main(int argc, char *argv[]) {
    if (argc < 2) {
        fprintf(stderr, "usage: %s <uid> [<gid>] [--] <program> [args...]\n", argv[0]);
        return 1;
    }

    uid_t uid = atoi(argv[1]);

jwilder/dockerize:

func main() {
    flag.Parse()

    if *version {
        fmt.Printf("dockerize version %s\n", Version)
        os.Exit(0)
    }

    if len(flag.Args()) < 1 {
        fmt.Fprintf(os.Stderr, "Usage: dockerize [options] <command> [args ...]\n")
        os.Exit(1)
    }