diff --git a/utils/.gitignore b/utils/.gitignore
index 2f9143f2..c86a23ab 100644
--- a/utils/.gitignore
+++ b/utils/.gitignore
@@ -1,6 +1,7 @@
*.o
calc
cat
+chroot
chvideomode
clear
colormake
diff --git a/utils/Makefile b/utils/Makefile
index 66ff4919..edbb48e2 100644
--- a/utils/Makefile
+++ b/utils/Makefile
@@ -17,6 +17,7 @@ CXXFLAGS:=$(CXXFLAGS) -Wall -Wextra -fno-exceptions -fno-rtti
BINARIES:=\
calc \
cat \
+chroot \
chvideomode \
clear \
colormake \
diff --git a/utils/chroot.cpp b/utils/chroot.cpp
new file mode 100644
index 00000000..1ad7aafd
--- /dev/null
+++ b/utils/chroot.cpp
@@ -0,0 +1,116 @@
+/*******************************************************************************
+
+ Copyright(C) Jonas 'Sortie' Termansen 2013.
+
+ This program is free software: you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by the Free
+ Software Foundation, either version 3 of the License, or (at your option)
+ any later version.
+
+ This program is distributed in the hope that it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ more details.
+
+ You should have received a copy of the GNU General Public License along with
+ this program. If not, see .
+
+ chroot.cpp
+ Runs a process with another root directory.
+
+*******************************************************************************/
+
+#include
+#include
+#include
+#include
+#include
+#include
+
+#if !defined(VERSIONSTR)
+#define VERSIONSTR "unknown version"
+#endif
+
+void CompactArguments(int* argc, char*** argv)
+{
+ for ( int i = 0; i < *argc; i++ )
+ while ( i < *argc && !(*argv)[i] )
+ {
+ for ( int n = i; n < *argc; n++ )
+ (*argv)[n] = (*argv)[n+1];
+ (*argc)--;
+ }
+}
+
+void Usage(FILE* fp, const char* argv0)
+{
+ fprintf(fp, "Usage: %s [OPTION]... ROOT [CMD] [ARGUMENT...]\n", argv0);
+}
+
+void Help(FILE* fp, const char* argv0)
+{
+ Usage(fp, argv0);
+}
+
+void Version(FILE* fp, const char* argv0)
+{
+ fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
+ fprintf(fp, "License GPLv3+: GNU GPL version 3 or later .\n");
+ fprintf(fp, "This is free software: you are free to change and redistribute it.\n");
+ fprintf(fp, "There is NO WARRANTY, to the extent permitted by law.\n");
+}
+
+int main(int argc, char* argv[])
+{
+ const char* argv0 = argv[0];
+ for ( int i = 1; i < argc; i++ )
+ {
+ const char* arg = argv[i];
+ if ( arg[0] != '-' )
+ continue;
+ argv[i] = NULL;
+ if ( !strcmp(arg, "--") )
+ break;
+ if ( arg[1] != '-' )
+ {
+ while ( char c = *++arg ) switch ( c )
+ {
+ default:
+ fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
+ Usage(stderr, argv0);
+ exit(1);
+ }
+ }
+ else if ( !strcmp(arg, "--help") ) { Help(stdout, argv0); exit(0); }
+ else if ( !strcmp(arg, "--usage") ) { Usage(stdout, argv0); exit(0); }
+ else if ( !strcmp(arg, "--version") ) { Version(stdout, argv0); exit(0); }
+ else
+ {
+ fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
+ Usage(stderr, argv0);
+ exit(1);
+ }
+ }
+
+ CompactArguments(&argc, &argv);
+
+ if ( argc < 2 )
+ {
+ error(0, 0, "missing operand, expected new root directory");
+ Usage(stdout, argv0);
+ exit(0);
+ }
+
+ if ( chroot(argv[1]) != 0 )
+ error(1, errno, "`%s'", argv[1]);
+
+ if ( chdir("/.") != 0 )
+ error(1, errno, "chdir: `%s/.'", argv[1]);
+
+ char* default_argv[] = { (char*) "sh", (char*) NULL };
+
+ char** exec_argv = 3 <= argc ? argv + 2 : default_argv;
+ execvp(exec_argv[0], exec_argv);
+
+ error(127, errno, "`%s'", exec_argv[0]);
+}