From aa9512d232e611ccbba46b17349168e501e2bd78 Mon Sep 17 00:00:00 2001
From: kit <kit@linuxposting.xyz>
Date: Mon, 18 May 2026 16:11:59 -0400
Subject: [PATCH] initial

---
 Makefile            | 18 ++++++++++++++++++
 exec-in-chroot.c    | 31 +++++++++++++++++++++++++++++++
 exec-in-chroot.conf |  5 +++++
 3 files changed, 54 insertions(+)
 create mode 100755 Makefile
 create mode 100644 exec-in-chroot.c
 create mode 100644 exec-in-chroot.conf

diff --git a/Makefile b/Makefile
new file mode 100755
index 0000000..46cb9f8
--- /dev/null
+++ b/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
diff --git a/exec-in-chroot.c b/exec-in-chroot.c
new file mode 100644
index 0000000..138977c
--- /dev/null
+++ b/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;
+}
diff --git a/exec-in-chroot.conf b/exec-in-chroot.conf
new file mode 100644
index 0000000..807c52e
--- /dev/null
+++ b/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