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Add chroot(1).
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d2aab888d1
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3 changed files with 118 additions and 0 deletions
1
utils/.gitignore
vendored
1
utils/.gitignore
vendored
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@ -1,6 +1,7 @@
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*.o
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calc
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cat
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chroot
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chvideomode
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clear
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colormake
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@ -17,6 +17,7 @@ CXXFLAGS:=$(CXXFLAGS) -Wall -Wextra -fno-exceptions -fno-rtti
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BINARIES:=\
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calc \
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cat \
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chroot \
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chvideomode \
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clear \
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colormake \
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116
utils/chroot.cpp
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116
utils/chroot.cpp
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/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2013.
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This program is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see <http://www.gnu.org/licenses/>.
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chroot.cpp
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Runs a process with another root directory.
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*******************************************************************************/
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#include <errno.h>
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#include <error.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#if !defined(VERSIONSTR)
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#define VERSIONSTR "unknown version"
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#endif
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void CompactArguments(int* argc, char*** argv)
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{
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for ( int i = 0; i < *argc; i++ )
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while ( i < *argc && !(*argv)[i] )
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{
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for ( int n = i; n < *argc; n++ )
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(*argv)[n] = (*argv)[n+1];
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(*argc)--;
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}
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}
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void Usage(FILE* fp, const char* argv0)
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{
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fprintf(fp, "Usage: %s [OPTION]... ROOT [CMD] [ARGUMENT...]\n", argv0);
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}
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void Help(FILE* fp, const char* argv0)
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{
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Usage(fp, argv0);
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}
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void Version(FILE* fp, const char* argv0)
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{
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fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
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fprintf(fp, "License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.\n");
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fprintf(fp, "This is free software: you are free to change and redistribute it.\n");
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fprintf(fp, "There is NO WARRANTY, to the extent permitted by law.\n");
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}
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int main(int argc, char* argv[])
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{
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const char* argv0 = argv[0];
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for ( int i = 1; i < argc; i++ )
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{
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const char* arg = argv[i];
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if ( arg[0] != '-' )
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continue;
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argv[i] = NULL;
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if ( !strcmp(arg, "--") )
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break;
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if ( arg[1] != '-' )
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{
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while ( char c = *++arg ) switch ( c )
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{
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default:
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fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
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Usage(stderr, argv0);
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exit(1);
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}
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}
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else if ( !strcmp(arg, "--help") ) { Help(stdout, argv0); exit(0); }
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else if ( !strcmp(arg, "--usage") ) { Usage(stdout, argv0); exit(0); }
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else if ( !strcmp(arg, "--version") ) { Version(stdout, argv0); exit(0); }
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else
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{
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fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
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Usage(stderr, argv0);
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exit(1);
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}
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}
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CompactArguments(&argc, &argv);
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if ( argc < 2 )
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{
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error(0, 0, "missing operand, expected new root directory");
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Usage(stdout, argv0);
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exit(0);
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}
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if ( chroot(argv[1]) != 0 )
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error(1, errno, "`%s'", argv[1]);
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if ( chdir("/.") != 0 )
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error(1, errno, "chdir: `%s/.'", argv[1]);
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char* default_argv[] = { (char*) "sh", (char*) NULL };
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char** exec_argv = 3 <= argc ? argv + 2 : default_argv;
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execvp(exec_argv[0], exec_argv);
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error(127, errno, "`%s'", exec_argv[0]);
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}
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