188 lines
4.9 KiB
188 lines
4.9 KiB
# --- SDE-COPYRIGHT-NOTE-BEGIN --- |
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# This copyright note is auto-generated by ./scripts/Create-CopyPatch. |
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# |
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# Filename: package/.../embutils/x-switch_root.patch |
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# Copyright (C) 2007 The OpenSDE Project |
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# Copyright (C) 2004 - 2006 The T2 SDE Project |
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# |
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# More information can be found in the files COPYING and README. |
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# |
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# This patch file is dual-licensed. It is available under the license the |
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# patched project is licensed under, as long as it is an OpenSource license |
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# as defined at http://www.opensource.org/ (e.g. BSD, X11) or under the terms |
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# of the GNU General Public License as published by the Free Software |
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# Foundation; either version 2 of the License, or (at your option) any later |
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# version. |
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# --- SDE-COPYRIGHT-NOTE-END --- |
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pivot_root'ing rootfs does uncover kernel inf. loops, thus I extraced some |
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bits form the Fedora Core's nash to trick around with moving the mount point |
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and chroot to move the real root device to / - yuck. |
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- Rene Rebe <rene@exactcode.de> |
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--- embutils-0.17/switch_root.c 1970-01-01 00:00:00.000000000 +0000 |
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+++ embutils-0.17-more/switch_root.c 2005-08-27 09:05:22.000000000 +0000 |
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@@ -0,0 +1,151 @@ |
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+ |
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+/* inspired by Fedora Core's mkinitrd/nash beast |
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+ - to pivot_root alike functionality with initramfs |
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+ |
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+ 2005 by Rene Rebe |
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+ */ |
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+ |
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+#include <sys/types.h> |
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+#include <sys/stat.h> |
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+#include <fcntl.h> |
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+#include <dirent.h> |
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+#include <stdio.h> |
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+#include <errno.h> |
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+ |
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+#ifndef MS_REMOUNT |
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+#define MS_REMOUNT 32 |
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+#endif |
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+ |
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+#ifndef MS_BIND |
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+#define MS_BIND 4096 |
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+#endif |
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+ |
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+#ifndef MS_MOVE |
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+#define MS_MOVE 8192 |
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+#endif |
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+ |
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+/* remove all files/directories below dirName -- don't cross mountpoints */ |
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+int recursiveRemove(char * dirName) { |
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+ struct stat sb,rb; |
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+ DIR * dir; |
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+ struct dirent * d; |
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+ char * strBuf = alloca(strlen(dirName) + 1024); |
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+ |
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+ if (!(dir = opendir(dirName))) { |
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+ fprintf(stderr, "error opening %s: %d\n", dirName, errno); |
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+ return 0; |
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+ } |
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+ |
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+ if (fstat(dirfd(dir),&rb)) { |
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+ fprintf(stderr, "unable to stat %s: %d\n", dirName, errno); |
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+ return 0; |
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+ } |
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+ |
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+ errno = 0; |
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+ while ((d = readdir(dir))) { |
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+ errno = 0; |
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+ |
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+ if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, "..")) { |
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+ errno = 0; |
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+ continue; |
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+ } |
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+ |
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+ strcpy(strBuf, dirName); |
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+ strcat(strBuf, "/"); |
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+ strcat(strBuf, d->d_name); |
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+ |
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+ if (lstat(strBuf, &sb)) { |
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+ fprintf(stderr, "failed to stat %s: %d\n", strBuf, errno); |
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+ errno = 0; |
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+ continue; |
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+ } |
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+ |
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+ /* only descend into subdirectories if device is same as dir */ |
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+ if (S_ISDIR(sb.st_mode)) { |
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+ if (sb.st_dev == rb.st_dev) { |
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+ recursiveRemove(strBuf); |
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+ if (rmdir(strBuf)) |
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+ fprintf(stderr, "failed to rmdir %s: %d\n", strBuf, errno); |
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+ } |
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+ errno = 0; |
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+ continue; |
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+ } |
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+ |
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+ if (unlink(strBuf)) { |
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+ fprintf(stderr, "failed to remove %s: %d\n", strBuf, errno); |
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+ errno = 0; |
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+ continue; |
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+ } |
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+ } |
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+ |
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+ if (errno) { |
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+ closedir(dir); |
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+ printf("error reading from %s: %d\n", dirName, errno); |
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+ return 1; |
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+ } |
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+ |
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+ closedir(dir); |
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+ |
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+ return 0; |
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+} |
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+ |
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+/* 2.6 magic not-pivot-root but kind of similar stuff. |
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+ * This is based on code from klibc/utils/run_init.c |
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+ */ |
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+int main (int argc, char* argv[]) { |
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+ char * new; |
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+ |
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+ if (!*++argv) { |
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+ printf("switch_root: new root mount point expected\n"); |
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+ return 1; |
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+ } |
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+ new = *argv; |
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+ |
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+ if (!*++argv) { |
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+ printf("switch_root: new init expected\n"); |
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+ return 1; |
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+ } |
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+ |
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+ int fd, i = 0; |
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+ |
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+ if (chdir(new)) { |
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+ printf("switch_root: chdir(%s) failed: %d\n", new, errno); |
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+ return 1; |
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+ } |
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+ |
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+ if ((fd = open("./dev/console", O_RDWR)) < 0) { |
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+ printf("ERROR opening /dev/console!!!!: %d\n", errno); |
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+ fd = 0; |
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+ } |
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+ |
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+ if (dup2(fd, 0) != 0) printf("error dup2'ing fd of %d to 0\n", fd); |
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+ if (dup2(fd, 1) != 1) printf("error dup2'ing fd of %d to 1\n", fd); |
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+ if (dup2(fd, 2) != 2) printf("error dup2'ing fd of %d to 2\n", fd); |
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+ if (fd > 2) |
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+ close(fd); |
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+ |
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+// recursiveRemove("/"); |
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+ |
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+ fd = open("/", O_RDONLY); |
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+ |
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+ if (mount(".", "/", NULL, MS_MOVE, NULL)) { |
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+ printf("switch_root: mount failed: %d\n", errno); |
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+ close(fd); |
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+ return 1; |
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+ } |
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+ |
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+ if (chroot(".") || chdir("/")) { |
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+ printf("switch_root: chroot() failed: %d\n", errno); |
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+ close(fd); |
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+ return 1; |
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+ } |
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+ |
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+ /* release the old "/" */ |
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+ close(fd); |
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+ |
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+ /* exec the init */ |
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+ fd = execvp (argv[0], argv); |
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+ printf ("switch_root: execvp failed: %d\n", fd); |
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+ return fd; |
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+} |
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+ |
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--- ./Makefile.orig 2007-03-28 00:46:09.000000000 -0400 |
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+++ ./Makefile 2007-03-28 00:46:49.000000000 -0400 |
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@@ -12,7 +12,7 @@ |
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domainname id ln mv cp yes which cat rm wc ls whoami mkfifo head install \ |
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sosrm soscp sosmv sosln soslns md5sum sleep2 allinone uniq tr mesg du \ |
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uuencode uudecode nohup nice cmp mktemp truncate strings test date \ |
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-printenv chrootuid renice free losetup |
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+printenv chrootuid renice free losetup switch_root |
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OS:=$(shell uname) |
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ifeq ($(OS),Linux)
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