.PHONY: install clean archive rpm testimage test all check AUTHORS
-ifeq (1,${WITH_SWITCH_ROOT})
-targets = modules.d/99base/switch_root
-else
-targets =
-endif
-
-all: $(targets) $(manpages) dracut.html
+all: syncheck $(manpages) dracut.html
%: %.xml
xsltproc -o $@ -nonet http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl $<
--stringparam html.stylesheet http://docs.redhat.com/docs/en-US/Common_Content/css/default.css \
http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl dracut.xml
-modules.d/99base/switch_root: switch_root.c
- gcc -D _GNU_SOURCE -D 'PACKAGE_STRING="dracut"' -std=gnu99 -fsigned-char -g -O2 -o modules.d/99base/switch_root switch_root.c
-
install:
mkdir -p $(DESTDIR)$(pkglibdir)
mkdir -p $(DESTDIR)$(sbindir)
install -m 0755 dracut-catimages $(DESTDIR)$(sbindir)/dracut-catimages
install -m 0755 mkinitrd-dracut.sh $(DESTDIR)$(sbindir)/mkinitrd
install -m 0755 lsinitrd $(DESTDIR)$(sbindir)/lsinitrd
-ifeq (1,${WITH_SWITCH_ROOT})
- install -m 0755 modules.d/99base/switch_root $(DESTDIR)$(sbindir)/switch_root
-endif
install -m 0644 dracut.conf $(DESTDIR)$(sysconfdir)/dracut.conf
mkdir -p $(DESTDIR)$(sysconfdir)/dracut.conf.d
install -m 0755 dracut-functions $(DESTDIR)$(pkglibdir)/dracut-functions
install -m 0644 dracut-gencmdline.8 $(DESTDIR)$(mandir)/man8
install -m 0644 dracut.conf.5 $(DESTDIR)$(mandir)/man5
install -m 0644 dracut.kernel.7 $(DESTDIR)$(mandir)/man7
-ifeq (1,${WITH_SWITCH_ROOT})
- rm $(DESTDIR)$(pkglibdir)/modules.d/99base/switch_root
-endif
clean:
$(RM) *~
$(RM) */*~
$(RM) */*/*~
- $(RM) modules.d/99base/switch_root
$(RM) test-*.img
$(RM) dracut-*.rpm dracut-*.tar.bz2
$(RM) $(manpages) dracut.html
+++ /dev/null
-/*
- * switchroot.c - switch to new root directory and start init.
- *
- * Copyright 2002-2009 Red Hat, Inc. All rights reserved.
- *
- * 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 2 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 <http://www.gnu.org/licenses/>.
- *
- * Authors:
- * Peter Jones <pjones@redhat.com>
- * Jeremy Katz <katzj@redhat.com>
- */
-#include <sys/mount.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/param.h>
-#include <fcntl.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <string.h>
-#include <errno.h>
-#include <ctype.h>
-#include <dirent.h>
-#include <err.h>
-#include <libgen.h>
-
-#ifndef MS_MOVE
-#define MS_MOVE 8192
-#endif
-
-/* find the enclosing mount point of a path, by examining the backing device
- * of parent directories until we reach / or find a parent with a differing
- * device.
- * result must be freed.
- */
-static char *get_parent_mount(const char *path)
-{
- struct stat sb;
- char dir[PATH_MAX];
- char tmp[PATH_MAX];
- dev_t inner_dev;
- int r;
-
- r = stat(path, &sb);
- if (r != 0) {
- warn("failed to stat %s", path);
- return NULL;
- }
- inner_dev = sb.st_dev;
-
- /* dirname has some annoying properties of modifying the input... */
- strncpy(dir, path, PATH_MAX);
- dir[PATH_MAX - 1] = 0; /* for safety */
-
- while (1) {
- char *parent;
-
- strncpy(tmp, dir, PATH_MAX);
- tmp[PATH_MAX - 1] = 0;
- parent = dirname(tmp);
-
- r = stat(parent, &sb);
- if (r != 0) {
- warn("failed to stat %s", parent);
- return NULL;
- }
-
- /* if the parent directory's device differs then we have found a mount
- * point */
- if (sb.st_dev != inner_dev)
- return strdup(dir);
-
- strncpy(dir, parent, PATH_MAX);
- dir[PATH_MAX - 1] = 0;
-
- /* maybe we've reached / */
- if (strlen(dir) == 1)
- return strdup(dir);
- }
-}
-
-/* remove all files/directories below dirName -- don't cross mountpoints */
-static int recursiveRemove(char *dirName)
-{
- struct stat rb;
- DIR *dir;
- int rc = -1;
- int dfd;
-
- if (!(dir = opendir(dirName))) {
- warn("failed to open %s", dirName);
- goto done;
- }
-
- dfd = dirfd(dir);
-
- if (fstat(dfd, &rb)) {
- warn("failed to stat %s", dirName);
- goto done;
- }
-
- while(1) {
- struct dirent *d;
-
- errno = 0;
- if (!(d = readdir(dir))) {
- if (errno) {
- warn("failed to read %s", dirName);
- goto done;
- }
- break; /* end of directory */
- }
-
- if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
- continue;
-
- if (d->d_type == DT_DIR) {
- struct stat sb;
-
- if (fstatat(dfd, d->d_name, &sb, AT_SYMLINK_NOFOLLOW)) {
- warn("failed to stat %s/%s", dirName, d->d_name);
- continue;
- }
-
- /* remove subdirectories if device is same as dir */
- if (sb.st_dev == rb.st_dev) {
- char subdir[ strlen(dirName) +
- strlen(d->d_name) + 2 ];
-
- sprintf(subdir, "%s/%s", dirName, d->d_name);
- recursiveRemove(subdir);
- } else
- continue;
- }
-
- if (unlinkat(dfd, d->d_name,
- d->d_type == DT_DIR ? AT_REMOVEDIR : 0))
- warn("failed to unlink %s/%s", dirName, d->d_name);
- }
-
- rc = 0; /* success */
-
-done:
- if (dir)
- closedir(dir);
- return rc;
-}
-
-static int switchroot(const char *newroot)
-{
- /* Don't try to unmount the old "/", there's no way to do it. */
- const char *umounts[] = { "/dev", "/proc", "/sys", NULL };
- char *newroot_mnt;
- const char *chroot_path = NULL;
- int i;
- int r = -1;
-
- for (i = 0; umounts[i] != NULL; i++) {
- char newmount[PATH_MAX];
-
- snprintf(newmount, sizeof(newmount), "%s%s", newroot, umounts[i]);
-
- if (mount(umounts[i], newmount, NULL, MS_MOVE, NULL) < 0) {
- warn("failed to mount moving %s to %s",
- umounts[i], newmount);
- warnx("forcing unmount of %s", umounts[i]);
- umount2(umounts[i], MNT_FORCE);
- }
- }
-
- if (chdir(newroot)) {
- warn("failed to change directory to %s", newroot);
- return -1;
- }
-
- recursiveRemove("/");
-
- newroot_mnt = get_parent_mount(newroot);
- if (newroot_mnt && strcmp(newroot, newroot_mnt)) {
- /* newroot is not a mount point, so we have to MS_MOVE the parent
- * mount point and then chroot in to the "subroot" */
- chroot_path = newroot + strlen(newroot_mnt);
- newroot = newroot_mnt;
-
- if (chdir(newroot)) {
- warn("failed to chdir to newroot mount %s", newroot);
- goto err;
- }
- }
-
- if (mount(newroot, "/", NULL, MS_MOVE, NULL) < 0) {
- warn("failed to mount moving %s to /", newroot);
- goto err;
- }
-
- if (chroot(".")) {
- warn("failed to change root");
- goto err;
- }
-
- if (chroot_path) {
- if (chdir(chroot_path)) {
- warn("failed to chdir to subroot %s", chroot_path);
- goto err;
- }
-
- if (chroot(".")) {
- warn("failed to change root to subroot");
- goto err;
- }
- }
-
- r = 0;
-err:
- if (newroot_mnt)
- free(newroot_mnt);
- return r;
-}
-
-static void usage(FILE *output)
-{
- fprintf(output, "usage: %s <newrootdir> <init> <args to init>\n",
- program_invocation_short_name);
- exit(output == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
-}
-
-static void version(void)
-{
- fprintf(stdout, "%s from %s\n", program_invocation_short_name,
- PACKAGE_STRING);
- exit(EXIT_SUCCESS);
-}
-
-int main(int argc, char *argv[])
-{
- char *newroot, *init, **initargs;
-
- if (argv[1] && (!strcmp(argv[1], "--help") || !strcmp(argv[1], "-h")))
- usage(stdout);
- if (argv[1] && (!strcmp(argv[1], "--version") || !strcmp(argv[1], "-V")))
- version();
- if (argc < 3)
- usage(stderr);
-
- newroot = argv[1];
- init = argv[2];
- initargs = &argv[2];
-
- if (!*newroot || !*init)
- usage(stderr);
-
- if (switchroot(newroot))
- errx(EXIT_FAILURE, "failed. Sorry.");
-
- if (access(init, X_OK))
- warn("cannot access %s", init);
-
- /* get session leader */
- setsid();
-
- /* set controlling terminal */
- if (ioctl (0, TIOCSCTTY, 1))
- warn("failed to TIOCSCTTY");
-
- execv(init, initargs);
- err(EXIT_FAILURE, "failed to execute %s", init);
-}
-
projects / platform / upstream / dracut.git / commitdiff