initial

Makefile

@@ -0,0 +1,18 @@
+#!/bin/make
+
+CFLAGS ?= -Ofast -march=native -mtune=native -static -Wall -Wextra -Wpedantic
+
+./exec-in-chroot: ./exec-in-chroot.c
+
+.PHONY: install uninstall clean
+install: ./exec-in-chroot
+	cp "$<" "${PREFIX}/bin/exec-in-chroot"
+	chmod 4555 "${PREFIX}/bin/exec-in-chroot"
+	cp -n "./exec-in-chroot.conf" "/etc/exec-in-chroot.conf"
+
+uninstall:
+	rm "${PREFIX}/bin/exec-in-chroot"
+	rm "/etc/exec-in-chroot.conf"
+
+clean:
+	rm ./exec-in-chroot

exec-in-chroot.c

@@ -0,0 +1,31 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdlib.h>
+
+const char *chroot_path = "/mnt/nfs/chroots/ff-build";
+
+int main (int argc, char **argv) {
+	uid_t user = getuid ();
+	char *cwd = getcwd (NULL, 0);
+	if (chroot (chroot_path) != 0) {
+		perror ("chroot");
+		return errno;
+	}
+
+	if (seteuid (user) != 0) {
+		perror ("seteuid");
+		return errno;
+	}
+
+	if (chdir (cwd) != 0) {
+		perror ("chdir");
+		chdir ("/");
+	}
+
+	free (cwd);
+
+	execvp (argv [0], &argv [0]);
+	perror ("execvp");
+	return errno;
+}

exec-in-chroot.conf

@@ -0,0 +1,5 @@
+# invoked_name chroot_path binary
+inv1 /path/1 bin1
+inv2 /path/2
+inv3
+inv4 /path/3 bin2