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package io.github.jshipit;
import com.sun.jna.Platform;
import java.io.File;
/*
* A class for running system commands
*/
public class SysUtils {
/*
* Untar a tarball to a directory
*
* @param in The tarball to untar
* @param out The directory to untar to
*/
public void untar(String in, String out) {
// We do not use the Java tar library because it does not care about unix permissions. Common Java L
new File(out).mkdirs();
ProcessBuilder pb = new ProcessBuilder("tar", "-xf", in, "-C", out);
pb.inheritIO();
try {
Process p = pb.start();
p.waitFor();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
/*
* Execute a command in a bwrap sandbox
*
* @param args The arguments to pass to bwrap
* @param execute Whether to execute the command or just return the command
*
* @return The command that was executed. Empty string if execute is true
*/
public String execInBwrap(String[] args, boolean execute) {
if (!execute) {
return "bwrap "+String.join(" ", args);
}
// ProcessBuilder wraps the args in quotes, since all args are passed at once, they are all quoted together
// This breaks bwrap (and many other commands), so we use bash -c to execute the command with the entire command as the arg
ProcessBuilder pb = new ProcessBuilder("bash", "-c", "bwrap "+String.join(" ", args));
pb.inheritIO();
try {
Process p = pb.start();
p.waitFor();
} catch (Exception e) {
throw new RuntimeException(e);
}
return "";
}
/*
* Creates an overlay mount
*
* @param lower The lower directories to use
* @param upper The upper directory to use
* @param target The target directory to mount to
* @param work The work directory to use
* @param execute Whether to execute the command or just return the command
*
* @return The command that was executed. Empty string if execute is true
*/
public String overlayMount(String[] lower, String upper, String target, String work, boolean execute) {
if (!execute) {
return "mount -t overlay overlay -o lowerdir="+String.join(":", lower)+",upperdir="+upper+",workdir="+work+" "+target;
}
if (Platform.isLinux()) {
// unshare creates a new user namespace, so we can mount without root
// This only works on Linux version 5.11 and above, which everyone should have by now
ProcessBuilder pb = new ProcessBuilder("unshare", "--user", "--map-root-user", "--mount", "mount", "-t", "overlay", "overlay", "-o", "lowerdir="+String.join(":", lower)+",upperdir="+upper+",workdir="+work, target);
pb.inheritIO();
try {
Process p = pb.start();
p.waitFor();
} catch (Exception e) {
throw new RuntimeException(e);
}
} else {
// Since other *nix systems do not have overlayfs or unshare, we just print an error
// I would be surprised if you even got this far on Windows
System.out.println("Platform not supported.");
}
return "";
}
}
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