[Libguestfs] [PATCH supermin v2 2/4] init: Move init program into separate init directory.
Richard W.M. Jones
rjones at redhat.com
Wed Feb 17 14:22:32 UTC 2016
This is just code motion.
---
.gitignore | 6 +-
Makefile.am | 6 +-
configure.ac | 1 +
init/Makefile.am | 25 ++++
init/init.c | 428 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/Makefile.am | 12 +-
src/bin2s.pl | 11 +-
src/init.c | 428 -------------------------------------------------------
8 files changed, 466 insertions(+), 451 deletions(-)
create mode 100644 init/Makefile.am
create mode 100644 init/init.c
delete mode 100644 src/init.c
diff --git a/.gitignore b/.gitignore
index 2163b37..ff3680e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -29,12 +29,9 @@ pod2htm?.tmp
/depcomp
/examples/basic-full-appliance
/examples/basic-supermin.d
-/helper/ext2init.S
-/helper/supermin-helper
-/helper/supermin-helper.1
-/helper/init
/html/supermin-helper.1.html
/html/supermin.1.html
+/init/init
/local*
/INSTALL
/install-sh
@@ -43,7 +40,6 @@ pod2htm?.tmp
/src/.depend
/src/config.ml
/src/ext2init-bin.S
-/src/init
/src/supermin
/src/supermin.1
/src/supermin-link.sh
diff --git a/Makefile.am b/Makefile.am
index 9679da9..681c52a 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,5 +1,5 @@
# supermin Makefile.am
-# (C) Copyright 2009-2013 Red Hat Inc.
+# (C) Copyright 2009-2016 Red Hat Inc.
#
# 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
@@ -14,12 +14,10 @@
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-#
-# Written by Richard W.M. Jones <rjones at redhat.com>
ACLOCAL_AMFLAGS = -I m4
-SUBDIRS = lib src examples tests
+SUBDIRS = lib init src examples tests
EXTRA_DIST = \
.gitignore \
diff --git a/configure.ac b/configure.ac
index 0fe88c7..15f6537 100644
--- a/configure.ac
+++ b/configure.ac
@@ -192,6 +192,7 @@ AC_CONFIG_FILES([src/supermin-link.sh],
[chmod +x,-w src/supermin-link.sh])
AC_CONFIG_FILES([Makefile
examples/Makefile
+ init/Makefile
lib/Makefile
src/config.ml
src/Makefile
diff --git a/init/Makefile.am b/init/Makefile.am
new file mode 100644
index 0000000..075cf46
--- /dev/null
+++ b/init/Makefile.am
@@ -0,0 +1,25 @@
+# supermin Makefile.am
+# (C) Copyright 2009-2016 Red Hat Inc.
+#
+# 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, write to the Free Software
+# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+# init "script" used by ext2 initrd.
+
+CLEANFILES = *~
+
+noinst_PROGRAMS = init
+init_SOURCES = init.c
+init_CFLAGS = -static
+init_LDFLAGS = -static
diff --git a/init/init.c b/init/init.c
new file mode 100644
index 0000000..25d6bc6
--- /dev/null
+++ b/init/init.c
@@ -0,0 +1,428 @@
+/* supermin-helper reimplementation in C.
+ * Copyright (C) 2009-2014 Red Hat Inc.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/* This very minimal init "script" goes in the mini-initrd used to
+ * boot the ext2-based appliance. Note we have no shell, so we cannot
+ * use system(3) to run external commands. In fact, we don't have
+ * very much at all, except this program, and some kernel modules.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <inttypes.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <time.h>
+#include <termios.h>
+#include <sys/types.h>
+#include <sys/mount.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+
+#include <asm/unistd.h>
+
+/* Maximum time to wait for the root device to appear (seconds).
+ *
+ * On slow machines with lots of disks (Koji running the 255 disk test
+ * in libguestfs) this really can take several minutes.
+ *
+ * Note that the actual wait time is approximately double the number
+ * given here because there is a delay which doubles until it reaches
+ * this value.
+ */
+#define MAX_ROOT_WAIT 300
+
+extern long init_module (void *, unsigned long, const char *);
+
+/* translation taken from module-init-tools/insmod.c */
+static const char *moderror(int err)
+{
+ switch (err) {
+ case ENOEXEC:
+ return "Invalid module format";
+ case ENOENT:
+ return "Unknown symbol in module";
+ case ESRCH:
+ return "Module has wrong symbol version";
+ case EINVAL:
+ return "Invalid parameters";
+ default:
+ return strerror(err);
+ }
+}
+
+/* Leave this enabled for now. When we get more confident in the boot
+ * process we can turn this off or make it configurable.
+ */
+#define verbose 1
+
+static void mount_proc (void);
+static void print_uptime (void);
+static void read_cmdline (void);
+static void insmod (const char *filename);
+static void show_directory (const char *dir);
+
+static char cmdline[1024];
+static char line[1024];
+
+int
+main ()
+{
+ mount_proc ();
+
+ print_uptime ();
+ fprintf (stderr, "supermin: ext2 mini initrd starting up: "
+ PACKAGE_VERSION
+ "\n");
+
+ read_cmdline ();
+
+ /* Create some fixed directories. */
+ mkdir ("/dev", 0755);
+ mkdir ("/root", 0755);
+ mkdir ("/sys", 0755);
+
+ /* Mount /sys. */
+ if (verbose)
+ fprintf (stderr, "supermin: mounting /sys\n");
+ if (mount ("sysfs", "/sys", "sysfs", 0, "") == -1) {
+ perror ("mount: /sys");
+ exit (EXIT_FAILURE);
+ }
+
+ FILE *fp = fopen ("/modules", "r");
+ if (fp == NULL) {
+ perror ("fopen: /modules");
+ exit (EXIT_FAILURE);
+ }
+ while (fgets (line, sizeof line, fp)) {
+ size_t n = strlen (line);
+ if (n > 0 && line[n-1] == '\n')
+ line[--n] = '\0';
+
+ /* XXX Because of the way we construct the module list, the
+ * "modules" file can contain non-existent modules. Ignore those
+ * for now. Really we should add them as missing dependencies.
+ * See ext2initrd.c:ext2_make_initrd().
+ */
+ if (access (line, R_OK) == 0)
+ insmod (line);
+ else
+ fprintf (stderr, "skipped %s, module is missing\n", line);
+ }
+ fclose (fp);
+
+ /* Look for the ext2 filesystem device. It's always the last one
+ * that was added. Modern versions of libguestfs supply the
+ * expected name of the root device on the command line
+ * ("root=/dev/..."). For virtio-scsi this is required, because we
+ * must wait for the device to appear after the module is loaded.
+ */
+ char *root, *path;
+ size_t len;
+ root = strstr (cmdline, "root=");
+ if (root) {
+ root += 5;
+ if (strncmp (root, "/dev/", 5) == 0)
+ root += 5;
+ len = strcspn (root, " ");
+ root[len] = '\0';
+
+ asprintf (&path, "/sys/block/%s/dev", root);
+
+ uint64_t delay_ns = 250000;
+ int virtio_message = 0;
+ while (delay_ns <= MAX_ROOT_WAIT * UINT64_C(1000000000)) {
+ fp = fopen (path, "r");
+ if (fp != NULL)
+ goto found;
+
+ if (delay_ns > 1000000000) {
+ fprintf (stderr,
+ "supermin: waiting another %" PRIu64 " ns for %s to appear\n",
+ delay_ns, path);
+ if (!virtio_message) {
+ fprintf (stderr,
+ "This usually means your kernel doesn't support virtio, or supermin was unable\n"
+ "to load some kernel modules (see module loading messages above).\n");
+ virtio_message = 1;
+ }
+ }
+
+ struct timespec t;
+ t.tv_sec = delay_ns / 1000000000;
+ t.tv_nsec = delay_ns % 1000000000;
+ nanosleep (&t, NULL);
+ delay_ns *= 2;
+ }
+ }
+ else {
+ path = strdup ("/sys/block/xdx/dev");
+
+ char class[3] = { 'v', 's', 'h' };
+ size_t i, j;
+ fp = NULL;
+ for (i = 0; i < sizeof class; ++i) {
+ for (j = 'z'; j >= 'a'; --j) {
+ path[11] = class[i];
+ path[13] = j;
+ fp = fopen (path, "r");
+ if (fp != NULL)
+ goto found;
+ }
+ }
+ }
+
+ fprintf (stderr,
+ "supermin: no ext2 root device found\n"
+ "Please include FULL verbose output in your bug report.\n");
+ exit (EXIT_FAILURE);
+
+ found:
+ if (verbose)
+ fprintf (stderr, "supermin: picked %s as root device\n", path);
+
+ fgets (line, sizeof line, fp);
+ int major = atoi (line);
+ char *p = line + strcspn (line, ":") + 1;
+ int minor = atoi (p);
+
+ fclose (fp);
+ if (umount ("/sys") == -1) {
+ perror ("umount: /sys");
+ exit (EXIT_FAILURE);
+ }
+
+ /* Make current process the controlling process of the tty. */
+ setsid ();
+#ifdef TIOCSCTTY
+ if (ioctl (0, TIOCSCTTY, 1) == -1)
+ perror ("ioctl: TIOCSCTTY");
+#endif
+
+ if (verbose)
+ fprintf (stderr, "supermin: creating /dev/root as block special %d:%d\n",
+ major, minor);
+
+ if (mknod ("/dev/root", S_IFBLK|0700, makedev (major, minor)) == -1) {
+ perror ("mknod: /dev/root");
+ exit (EXIT_FAILURE);
+ }
+
+ /* Mount new root and chroot to it. */
+ if (verbose)
+ fprintf (stderr, "supermin: mounting new root on /root\n");
+ if (mount ("/dev/root", "/root", "ext2", MS_NOATIME, "") == -1) {
+ perror ("mount: /root");
+ exit (EXIT_FAILURE);
+ }
+
+ /* Note that pivot_root won't work. See the note in
+ * Documentation/filesystems/ramfs-rootfs-initramfs.txt
+ * We could remove the old initramfs files, but let's not bother.
+ */
+ if (verbose)
+ fprintf (stderr, "supermin: chroot\n");
+
+ if (chroot ("/root") == -1) {
+ perror ("chroot: /root");
+ exit (EXIT_FAILURE);
+ }
+
+ chdir ("/");
+
+ /* Run /init from ext2 filesystem. */
+ execl ("/init", "init", NULL);
+ perror ("execl: /init");
+
+ /* /init failed to execute, but why? Before we ditch, print some
+ * debug. Although we have a full appliance, the fact that /init
+ * failed to run means we may not be able to run any commands.
+ */
+ show_directory ("/");
+ show_directory ("/bin");
+ show_directory ("/lib");
+ show_directory ("/lib64");
+ fflush (stderr);
+
+ exit (EXIT_FAILURE);
+}
+
+static void
+insmod (const char *filename)
+{
+ size_t size;
+
+ if (verbose)
+ fprintf (stderr, "supermin: internal insmod %s\n", filename);
+
+ int fd = open (filename, O_RDONLY);
+ if (fd == -1) {
+ fprintf (stderr, "insmod: open: %s: %m\n", filename);
+ exit (EXIT_FAILURE);
+ }
+ struct stat st;
+ if (fstat (fd, &st) == -1) {
+ perror ("insmod: fstat");
+ exit (EXIT_FAILURE);
+ }
+ size = st.st_size;
+ char buf[size];
+ size_t offset = 0;
+ do {
+ ssize_t rc = read (fd, buf + offset, size - offset);
+ if (rc == -1) {
+ perror ("insmod: read");
+ exit (EXIT_FAILURE);
+ }
+ offset += rc;
+ } while (offset < size);
+ close (fd);
+
+ if (init_module (buf, size, "") != 0) {
+ fprintf (stderr, "insmod: init_module: %s: %s\n", filename, moderror (errno));
+ /* However ignore the error because this can just happen because
+ * of a missing device.
+ */
+ }
+}
+
+/* Mount /proc unless it's mounted already. */
+static void
+mount_proc (void)
+{
+ if (access ("/proc/uptime", R_OK) == -1) {
+ mkdir ("/proc", 0755);
+
+ if (verbose)
+ fprintf (stderr, "supermin: mounting /proc\n");
+
+ if (mount ("proc", "/proc", "proc", 0, "") == -1) {
+ perror ("mount: /proc");
+ /* Non-fatal. */
+ }
+ }
+}
+
+/* Print contents of /proc/uptime. */
+static void
+print_uptime (void)
+{
+ FILE *fp = fopen ("/proc/uptime", "r");
+ if (fp == NULL) {
+ perror ("/proc/uptime");
+ return;
+ }
+
+ fgets (line, sizeof line, fp);
+ fclose (fp);
+
+ fprintf (stderr, "supermin: uptime: %s", line);
+}
+
+/* Read /proc/cmdline into cmdline global (or at least the first 1024
+ * bytes of it).
+ */
+static void
+read_cmdline (void)
+{
+ FILE *fp;
+ size_t len;
+
+ fp = fopen ("/proc/cmdline", "r");
+ if (fp == NULL) {
+ perror ("/proc/cmdline");
+ return;
+ }
+
+ fgets (cmdline, sizeof cmdline, fp);
+ fclose (fp);
+
+ len = strlen (cmdline);
+ if (len >= 1 && cmdline[len-1] == '\n')
+ cmdline[len-1] = '\0';
+
+ fprintf (stderr, "supermin: cmdline: %s\n", cmdline);
+}
+
+/* Display a directory on stderr. This is used for debugging only. */
+static char
+dirtype (int dt)
+{
+ switch (dt) {
+ case DT_BLK: return 'b';
+ case DT_CHR: return 'c';
+ case DT_DIR: return 'd';
+ case DT_FIFO: return 'p';
+ case DT_LNK: return 'l';
+ case DT_REG: return '-';
+ case DT_SOCK: return 's';
+ case DT_UNKNOWN: return 'u';
+ default: return '?';
+ }
+}
+
+static void
+show_directory (const char *dirname)
+{
+ DIR *dir;
+ struct dirent *d;
+ struct stat statbuf;
+ char link[PATH_MAX+1];
+ ssize_t n;
+
+ fprintf (stderr, "supermin: debug: listing directory %s\n", dirname);
+
+ if (chdir (dirname) == -1) {
+ perror (dirname);
+ return;
+ }
+
+ dir = opendir (".");
+ if (!dir) {
+ perror (dirname);
+ chdir ("/");
+ return;
+ }
+
+ while ((d = readdir (dir)) != NULL) {
+ fprintf (stderr, "%5lu %c %-16s", d->d_ino, dirtype (d->d_type), d->d_name);
+ if (lstat (d->d_name, &statbuf) >= 0) {
+ fprintf (stderr, " %06o %ld %d:%d",
+ statbuf.st_mode, statbuf.st_size,
+ statbuf.st_uid, statbuf.st_gid);
+ if (S_ISLNK (statbuf.st_mode)) {
+ n = readlink (d->d_name, link, PATH_MAX);
+ if (n >= 0) {
+ link[n] = '\0';
+ fprintf (stderr, " -> %s", link);
+ }
+ }
+ }
+ fprintf (stderr, "\n");
+ }
+
+ closedir (dir);
+ chdir ("/");
+}
diff --git a/src/Makefile.am b/src/Makefile.am
index 5a601fe..443e25d 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,5 +1,5 @@
# supermin Makefile.am
-# (C) Copyright 2009-2014 Red Hat Inc.
+# (C) Copyright 2009-2016 Red Hat Inc.
#
# 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
@@ -14,8 +14,6 @@
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-#
-# Written by Richard W.M. Jones <rjones at redhat.com>
EXTRA_DIST = \
.depend \
@@ -138,18 +136,12 @@ supermin_LINK = \
.ml.cmx:
$(OCAMLFIND) ocamlopt $(OCAMLFLAGS) $(OCAMLPACKAGES) -c $< -o $@
-# init "script" used by ext2 initrd.
-noinst_PROGRAMS = init
-init_SOURCES = init.c
-init_CFLAGS = -static
-init_LDFLAGS = -static
-
CLEANFILES += ext2init-bin.S
ext2init-bin.o: ext2init-bin.S
$(CC) -o $@ -c $<
-ext2init-bin.S: init $(srcdir)/bin2s.pl
+ext2init-bin.S: ../init/init $(srcdir)/bin2s.pl
strip --strip-all $<
@file $< | grep -isq static || \
(echo "*** error: init is not statically linked"; exit 1)
diff --git a/src/bin2s.pl b/src/bin2s.pl
index 8558126..6c70446 100755
--- a/src/bin2s.pl
+++ b/src/bin2s.pl
@@ -30,6 +30,9 @@ my ($buf, $i, $sz);
open my $ifh, '<', $infile or die "open $infile: $!";
open my $ofh, '>', $outfile or die "open $outfile: $!";
+my $infile_basename = $infile;
+$infile_basename =~ s{.*/}{};
+
print $ofh <<"EOF";
/* This file has been automatically generated from $infile by $0 */
@@ -37,11 +40,11 @@ print $ofh <<"EOF";
\t.section .note.GNU-stack,"",%progbits
\t.previous
-\t.globl\t_binary_${infile}_start
-\t.globl\t_binary_${infile}_end
+\t.globl\t_binary_${infile_basename}_start
+\t.globl\t_binary_${infile_basename}_end
\t.section\t.rodata
-_binary_${infile}_start:
+_binary_${infile_basename}_start:
EOF
$sz = 0;
@@ -54,7 +57,7 @@ die "read $infile (at offset $sz): $!\n" if not defined $i;
close $ifh;
print $ofh <<"EOF";
-_binary_${infile}_end:
+_binary_${infile_basename}_end:
EOF
close $ofh;
diff --git a/src/init.c b/src/init.c
deleted file mode 100644
index 25d6bc6..0000000
--- a/src/init.c
+++ /dev/null
@@ -1,428 +0,0 @@
-/* supermin-helper reimplementation in C.
- * Copyright (C) 2009-2014 Red Hat Inc.
- *
- * 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, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-/* This very minimal init "script" goes in the mini-initrd used to
- * boot the ext2-based appliance. Note we have no shell, so we cannot
- * use system(3) to run external commands. In fact, we don't have
- * very much at all, except this program, and some kernel modules.
- */
-
-#include <config.h>
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdint.h>
-#include <string.h>
-#include <inttypes.h>
-#include <unistd.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <dirent.h>
-#include <time.h>
-#include <termios.h>
-#include <sys/types.h>
-#include <sys/mount.h>
-#include <sys/stat.h>
-#include <sys/wait.h>
-
-#include <asm/unistd.h>
-
-/* Maximum time to wait for the root device to appear (seconds).
- *
- * On slow machines with lots of disks (Koji running the 255 disk test
- * in libguestfs) this really can take several minutes.
- *
- * Note that the actual wait time is approximately double the number
- * given here because there is a delay which doubles until it reaches
- * this value.
- */
-#define MAX_ROOT_WAIT 300
-
-extern long init_module (void *, unsigned long, const char *);
-
-/* translation taken from module-init-tools/insmod.c */
-static const char *moderror(int err)
-{
- switch (err) {
- case ENOEXEC:
- return "Invalid module format";
- case ENOENT:
- return "Unknown symbol in module";
- case ESRCH:
- return "Module has wrong symbol version";
- case EINVAL:
- return "Invalid parameters";
- default:
- return strerror(err);
- }
-}
-
-/* Leave this enabled for now. When we get more confident in the boot
- * process we can turn this off or make it configurable.
- */
-#define verbose 1
-
-static void mount_proc (void);
-static void print_uptime (void);
-static void read_cmdline (void);
-static void insmod (const char *filename);
-static void show_directory (const char *dir);
-
-static char cmdline[1024];
-static char line[1024];
-
-int
-main ()
-{
- mount_proc ();
-
- print_uptime ();
- fprintf (stderr, "supermin: ext2 mini initrd starting up: "
- PACKAGE_VERSION
- "\n");
-
- read_cmdline ();
-
- /* Create some fixed directories. */
- mkdir ("/dev", 0755);
- mkdir ("/root", 0755);
- mkdir ("/sys", 0755);
-
- /* Mount /sys. */
- if (verbose)
- fprintf (stderr, "supermin: mounting /sys\n");
- if (mount ("sysfs", "/sys", "sysfs", 0, "") == -1) {
- perror ("mount: /sys");
- exit (EXIT_FAILURE);
- }
-
- FILE *fp = fopen ("/modules", "r");
- if (fp == NULL) {
- perror ("fopen: /modules");
- exit (EXIT_FAILURE);
- }
- while (fgets (line, sizeof line, fp)) {
- size_t n = strlen (line);
- if (n > 0 && line[n-1] == '\n')
- line[--n] = '\0';
-
- /* XXX Because of the way we construct the module list, the
- * "modules" file can contain non-existent modules. Ignore those
- * for now. Really we should add them as missing dependencies.
- * See ext2initrd.c:ext2_make_initrd().
- */
- if (access (line, R_OK) == 0)
- insmod (line);
- else
- fprintf (stderr, "skipped %s, module is missing\n", line);
- }
- fclose (fp);
-
- /* Look for the ext2 filesystem device. It's always the last one
- * that was added. Modern versions of libguestfs supply the
- * expected name of the root device on the command line
- * ("root=/dev/..."). For virtio-scsi this is required, because we
- * must wait for the device to appear after the module is loaded.
- */
- char *root, *path;
- size_t len;
- root = strstr (cmdline, "root=");
- if (root) {
- root += 5;
- if (strncmp (root, "/dev/", 5) == 0)
- root += 5;
- len = strcspn (root, " ");
- root[len] = '\0';
-
- asprintf (&path, "/sys/block/%s/dev", root);
-
- uint64_t delay_ns = 250000;
- int virtio_message = 0;
- while (delay_ns <= MAX_ROOT_WAIT * UINT64_C(1000000000)) {
- fp = fopen (path, "r");
- if (fp != NULL)
- goto found;
-
- if (delay_ns > 1000000000) {
- fprintf (stderr,
- "supermin: waiting another %" PRIu64 " ns for %s to appear\n",
- delay_ns, path);
- if (!virtio_message) {
- fprintf (stderr,
- "This usually means your kernel doesn't support virtio, or supermin was unable\n"
- "to load some kernel modules (see module loading messages above).\n");
- virtio_message = 1;
- }
- }
-
- struct timespec t;
- t.tv_sec = delay_ns / 1000000000;
- t.tv_nsec = delay_ns % 1000000000;
- nanosleep (&t, NULL);
- delay_ns *= 2;
- }
- }
- else {
- path = strdup ("/sys/block/xdx/dev");
-
- char class[3] = { 'v', 's', 'h' };
- size_t i, j;
- fp = NULL;
- for (i = 0; i < sizeof class; ++i) {
- for (j = 'z'; j >= 'a'; --j) {
- path[11] = class[i];
- path[13] = j;
- fp = fopen (path, "r");
- if (fp != NULL)
- goto found;
- }
- }
- }
-
- fprintf (stderr,
- "supermin: no ext2 root device found\n"
- "Please include FULL verbose output in your bug report.\n");
- exit (EXIT_FAILURE);
-
- found:
- if (verbose)
- fprintf (stderr, "supermin: picked %s as root device\n", path);
-
- fgets (line, sizeof line, fp);
- int major = atoi (line);
- char *p = line + strcspn (line, ":") + 1;
- int minor = atoi (p);
-
- fclose (fp);
- if (umount ("/sys") == -1) {
- perror ("umount: /sys");
- exit (EXIT_FAILURE);
- }
-
- /* Make current process the controlling process of the tty. */
- setsid ();
-#ifdef TIOCSCTTY
- if (ioctl (0, TIOCSCTTY, 1) == -1)
- perror ("ioctl: TIOCSCTTY");
-#endif
-
- if (verbose)
- fprintf (stderr, "supermin: creating /dev/root as block special %d:%d\n",
- major, minor);
-
- if (mknod ("/dev/root", S_IFBLK|0700, makedev (major, minor)) == -1) {
- perror ("mknod: /dev/root");
- exit (EXIT_FAILURE);
- }
-
- /* Mount new root and chroot to it. */
- if (verbose)
- fprintf (stderr, "supermin: mounting new root on /root\n");
- if (mount ("/dev/root", "/root", "ext2", MS_NOATIME, "") == -1) {
- perror ("mount: /root");
- exit (EXIT_FAILURE);
- }
-
- /* Note that pivot_root won't work. See the note in
- * Documentation/filesystems/ramfs-rootfs-initramfs.txt
- * We could remove the old initramfs files, but let's not bother.
- */
- if (verbose)
- fprintf (stderr, "supermin: chroot\n");
-
- if (chroot ("/root") == -1) {
- perror ("chroot: /root");
- exit (EXIT_FAILURE);
- }
-
- chdir ("/");
-
- /* Run /init from ext2 filesystem. */
- execl ("/init", "init", NULL);
- perror ("execl: /init");
-
- /* /init failed to execute, but why? Before we ditch, print some
- * debug. Although we have a full appliance, the fact that /init
- * failed to run means we may not be able to run any commands.
- */
- show_directory ("/");
- show_directory ("/bin");
- show_directory ("/lib");
- show_directory ("/lib64");
- fflush (stderr);
-
- exit (EXIT_FAILURE);
-}
-
-static void
-insmod (const char *filename)
-{
- size_t size;
-
- if (verbose)
- fprintf (stderr, "supermin: internal insmod %s\n", filename);
-
- int fd = open (filename, O_RDONLY);
- if (fd == -1) {
- fprintf (stderr, "insmod: open: %s: %m\n", filename);
- exit (EXIT_FAILURE);
- }
- struct stat st;
- if (fstat (fd, &st) == -1) {
- perror ("insmod: fstat");
- exit (EXIT_FAILURE);
- }
- size = st.st_size;
- char buf[size];
- size_t offset = 0;
- do {
- ssize_t rc = read (fd, buf + offset, size - offset);
- if (rc == -1) {
- perror ("insmod: read");
- exit (EXIT_FAILURE);
- }
- offset += rc;
- } while (offset < size);
- close (fd);
-
- if (init_module (buf, size, "") != 0) {
- fprintf (stderr, "insmod: init_module: %s: %s\n", filename, moderror (errno));
- /* However ignore the error because this can just happen because
- * of a missing device.
- */
- }
-}
-
-/* Mount /proc unless it's mounted already. */
-static void
-mount_proc (void)
-{
- if (access ("/proc/uptime", R_OK) == -1) {
- mkdir ("/proc", 0755);
-
- if (verbose)
- fprintf (stderr, "supermin: mounting /proc\n");
-
- if (mount ("proc", "/proc", "proc", 0, "") == -1) {
- perror ("mount: /proc");
- /* Non-fatal. */
- }
- }
-}
-
-/* Print contents of /proc/uptime. */
-static void
-print_uptime (void)
-{
- FILE *fp = fopen ("/proc/uptime", "r");
- if (fp == NULL) {
- perror ("/proc/uptime");
- return;
- }
-
- fgets (line, sizeof line, fp);
- fclose (fp);
-
- fprintf (stderr, "supermin: uptime: %s", line);
-}
-
-/* Read /proc/cmdline into cmdline global (or at least the first 1024
- * bytes of it).
- */
-static void
-read_cmdline (void)
-{
- FILE *fp;
- size_t len;
-
- fp = fopen ("/proc/cmdline", "r");
- if (fp == NULL) {
- perror ("/proc/cmdline");
- return;
- }
-
- fgets (cmdline, sizeof cmdline, fp);
- fclose (fp);
-
- len = strlen (cmdline);
- if (len >= 1 && cmdline[len-1] == '\n')
- cmdline[len-1] = '\0';
-
- fprintf (stderr, "supermin: cmdline: %s\n", cmdline);
-}
-
-/* Display a directory on stderr. This is used for debugging only. */
-static char
-dirtype (int dt)
-{
- switch (dt) {
- case DT_BLK: return 'b';
- case DT_CHR: return 'c';
- case DT_DIR: return 'd';
- case DT_FIFO: return 'p';
- case DT_LNK: return 'l';
- case DT_REG: return '-';
- case DT_SOCK: return 's';
- case DT_UNKNOWN: return 'u';
- default: return '?';
- }
-}
-
-static void
-show_directory (const char *dirname)
-{
- DIR *dir;
- struct dirent *d;
- struct stat statbuf;
- char link[PATH_MAX+1];
- ssize_t n;
-
- fprintf (stderr, "supermin: debug: listing directory %s\n", dirname);
-
- if (chdir (dirname) == -1) {
- perror (dirname);
- return;
- }
-
- dir = opendir (".");
- if (!dir) {
- perror (dirname);
- chdir ("/");
- return;
- }
-
- while ((d = readdir (dir)) != NULL) {
- fprintf (stderr, "%5lu %c %-16s", d->d_ino, dirtype (d->d_type), d->d_name);
- if (lstat (d->d_name, &statbuf) >= 0) {
- fprintf (stderr, " %06o %ld %d:%d",
- statbuf.st_mode, statbuf.st_size,
- statbuf.st_uid, statbuf.st_gid);
- if (S_ISLNK (statbuf.st_mode)) {
- n = readlink (d->d_name, link, PATH_MAX);
- if (n >= 0) {
- link[n] = '\0';
- fprintf (stderr, " -> %s", link);
- }
- }
- }
- fprintf (stderr, "\n");
- }
-
- closedir (dir);
- chdir ("/");
-}
--
2.5.0
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