Clean checkin of the 6.03 codeandroid-wear-o-preview-4android-wear-o-preview-3android-wear-8.1.0_r1android-vts-8.1_r9android-vts-8.1_r8android-vts-8.1_r7android-vts-8.1_r6android-vts-8.1_r5android-vts-8.1_r4android-vts-8.1_r3android-vts-8.1_r14android-vts-8.1_r13android-vts-8.1_r12android-vts-8.1_r11android-vts-8.1_r10android-vts-8.0_r9android-vts-8.0_r8android-vts-8.0_r7android-vts-8.0_r6android-vts-8.0_r2android-vts-8.0_r13android-vts-8.0_r12android-vts-8.0_r11android-vts-8.0_r10android-vts-8.0_r1android-security-8.1.0_r93android-security-8.1.0_r92android-security-8.1.0_r91android-security-8.1.0_r90android-security-8.1.0_r89android-security-8.1.0_r88android-security-8.1.0_r87android-security-8.1.0_r86android-security-8.1.0_r85android-security-8.1.0_r84android-security-8.1.0_r83android-security-8.1.0_r82android-security-8.0.0_r54android-security-8.0.0_r53android-security-8.0.0_r52android-o-preview-4android-o-preview-3android-o-preview-2android-o-mr1-preview-2android-o-mr1-preview-1android-o-mr1-iot-release-smart-display-r9android-o-mr1-iot-release-smart-display-r8android-o-mr1-iot-release-smart-display-r5android-o-mr1-iot-release-smart-display-r40.1Jandroid-o-mr1-iot-release-smart-display-r4android-o-mr1-iot-release-smart-display-r39android-o-mr1-iot-release-smart-display-r30android-o-mr1-iot-release-smart-display-r3android-o-mr1-iot-release-smart-display-r22android-o-mr1-iot-release-smart-display-r14android-o-mr1-iot-release-smart-clock-r6android-o-mr1-iot-release-smart-clock-r2android-o-mr1-iot-release-smart-clock-fsiandroid-o-mr1-iot-release-smart-clock-fcsandroid-o-mr1-iot-release-cube_r2android-o-mr1-iot-release-cube-fsiandroid-o-mr1-iot-release-cube-fcsandroid-o-mr1-iot-release-1.0.8android-o-mr1-iot-release-1.0.7android-o-mr1-iot-release-1.0.5android-o-mr1-iot-release-1.0.4android-o-mr1-iot-release-1.0.3android-o-mr1-iot-release-1.0.2android-o-mr1-iot-release-1.0.14android-o-mr1-iot-release-1.0.13android-o-mr1-iot-release-1.0.12android-o-mr1-iot-release-1.0.10android-o-mr1-iot-release-1.0.1android-o-mr1-iot-release-1.0.0android-o-mr1-iot-preview-8android-o-mr1-iot-preview-7android-o-mr1-iot-preview-6android-o-iot-preview-5android-cts-8.1_r9android-cts-8.1_r8android-cts-8.1_r7android-cts-8.1_r6android-cts-8.1_r5android-cts-8.1_r4android-cts-8.1_r3android-cts-8.1_r25android-cts-8.1_r24android-cts-8.1_r23android-cts-8.1_r22android-cts-8.1_r21android-cts-8.1_r20android-cts-8.1_r2android-cts-8.1_r19android-cts-8.1_r18android-cts-8.1_r17android-cts-8.1_r16android-cts-8.1_r15android-cts-8.1_r14android-cts-8.1_r13android-cts-8.1_r12android-cts-8.1_r11android-cts-8.1_r10android-cts-8.1_r1android-cts-8.0_r9android-cts-8.0_r8android-cts-8.0_r7android-cts-8.0_r6android-cts-8.0_r5android-cts-8.0_r4android-cts-8.0_r3android-cts-8.0_r26android-cts-8.0_r25android-cts-8.0_r24android-cts-8.0_r23android-cts-8.0_r22android-cts-8.0_r21android-cts-8.0_r20android-cts-8.0_r2android-cts-8.0_r19android-cts-8.0_r18android-cts-8.0_r17android-cts-8.0_r16android-cts-8.0_r15android-cts-8.0_r14android-cts-8.0_r13android-cts-8.0_r12android-cts-8.0_r11android-cts-8.0_r10android-cts-8.0_r1android-8.1.0_r9android-8.1.0_r81android-8.1.0_r80android-8.1.0_r8android-8.1.0_r79android-8.1.0_r78android-8.1.0_r77android-8.1.0_r76android-8.1.0_r75android-8.1.0_r74android-8.1.0_r73android-8.1.0_r72android-8.1.0_r71android-8.1.0_r70android-8.1.0_r7android-8.1.0_r69android-8.1.0_r68android-8.1.0_r67android-8.1.0_r66android-8.1.0_r65android-8.1.0_r64android-8.1.0_r63android-8.1.0_r62android-8.1.0_r61android-8.1.0_r60android-8.1.0_r6android-8.1.0_r53android-8.1.0_r52android-8.1.0_r51android-8.1.0_r50android-8.1.0_r5android-8.1.0_r48android-8.1.0_r47android-8.1.0_r46android-8.1.0_r45android-8.1.0_r43android-8.1.0_r42android-8.1.0_r41android-8.1.0_r40android-8.1.0_r4android-8.1.0_r39android-8.1.0_r38android-8.1.0_r37android-8.1.0_r36android-8.1.0_r35android-8.1.0_r33android-8.1.0_r32android-8.1.0_r31android-8.1.0_r30android-8.1.0_r3android-8.1.0_r29android-8.1.0_r28android-8.1.0_r27android-8.1.0_r26android-8.1.0_r25android-8.1.0_r23android-8.1.0_r22android-8.1.0_r21android-8.1.0_r20android-8.1.0_r2android-8.1.0_r19android-8.1.0_r18android-8.1.0_r17android-8.1.0_r16android-8.1.0_r15android-8.1.0_r14android-8.1.0_r13android-8.1.0_r12android-8.1.0_r11android-8.1.0_r10android-8.1.0_r1android-8.0.0_r9android-8.0.0_r7android-8.0.0_r51android-8.0.0_r50android-8.0.0_r49android-8.0.0_r48android-8.0.0_r47android-8.0.0_r46android-8.0.0_r45android-8.0.0_r44android-8.0.0_r43android-8.0.0_r42android-8.0.0_r41android-8.0.0_r40android-8.0.0_r4android-8.0.0_r39android-8.0.0_r38android-8.0.0_r37android-8.0.0_r36android-8.0.0_r35android-8.0.0_r34android-8.0.0_r33android-8.0.0_r32android-8.0.0_r31android-8.0.0_r30android-8.0.0_r3android-8.0.0_r29android-8.0.0_r28android-8.0.0_r27android-8.0.0_r26android-8.0.0_r25android-8.0.0_r24android-8.0.0_r23android-8.0.0_r22android-8.0.0_r21android-8.0.0_r2android-8.0.0_r17android-8.0.0_r16android-8.0.0_r15android-8.0.0_r13android-8.0.0_r12android-8.0.0_r11android-8.0.0_r10android-8.0.0_r1security-oc-releasesecurity-oc-mr1-releaseoreo-vts-releaseoreo-security-releaseoreo-releaseoreo-r6-releaseoreo-r5-releaseoreo-r4-releaseoreo-r3-releaseoreo-r2-releaseoreo-mr1-wear-releaseoreo-mr1-vts-releaseoreo-mr1-security-releaseoreo-mr1-s1-releaseoreo-mr1-releaseoreo-mr1-iot-releaseoreo-mr1-devoreo-mr1-cuttlefish-testingoreo-mr1-cts-releaseoreo-mr1-1.2-iot-releaseoreo-m8-releaseoreo-m7-releaseoreo-m6-s4-releaseoreo-m6-s3-releaseoreo-m6-s2-releaseoreo-m5-releaseoreo-m4-s9-releaseoreo-m4-s8-releaseoreo-m4-s7-releaseoreo-m4-s6-releaseoreo-m4-s5-releaseoreo-m4-s4-releaseoreo-m4-s3-releaseoreo-m4-s2-releaseoreo-m4-s12-releaseoreo-m4-s11-releaseoreo-m4-s10-releaseoreo-m4-s1-releaseoreo-m3-releaseoreo-m2-s5-releaseoreo-m2-s4-releaseoreo-m2-s3-releaseoreo-m2-s2-releaseoreo-m2-s1-releaseoreo-m2-releaseoreo-dr3-releaseoreo-dr2-releaseoreo-dr1-releaseoreo-dr1-devoreo-devoreo-cts-releaseo-preview-4o-preview-3o-preview-2o-mr1-iot-preview-8o-mr1-iot-preview-7o-mr1-iot-preview-6o-iot-preview-5

BUG: 32495852
Change-Id: I5038a3bb41e217380c1188463daec07b1e9b6b48

2 files changed, 604 insertions, 0 deletions

diff --git a/linux/Makefile b/linux/Makefile
new file mode 100644
index 0000000..11667e1
--- /dev/null
+++ b/linux/Makefile
@@ -0,0 +1,69 @@
+## -----------------------------------------------------------------------
+##
+##   Copyright 2001-2008 H. Peter Anvin - 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, Inc., 53 Temple Place Ste 330,
+##   Boston MA 02111-1307, USA; either version 2 of the License, or
+##   (at your option) any later version; incorporated herein by reference.
+##
+## -----------------------------------------------------------------------
+
+##
+## Linux FAT/NTFS installer
+##
+
+include $(MAKEDIR)/syslinux.mk
+
+OPTFLAGS = -g -Os
+INCLUDES = -I$(SRC) -I$(objdir) -I$(SRC)/../libinstaller
+CFLAGS	 = $(GCCWARN) -D_FILE_OFFSET_BITS=64 $(OPTFLAGS) $(INCLUDES)
+LDFLAGS	 = 
+
+SRCS     = syslinux.c \
+	   ../libinstaller/syslxopt.c \
+	   ../libinstaller/syslxcom.c \
+	   ../libinstaller/setadv.c \
+	   ../libinstaller/advio.c \
+           ../libinstaller/fs.c \
+           ../libinstaller/syslxmod.c \
+	   ../libinstaller/bootsect_bin.c \
+	   ../libinstaller/ldlinuxc32_bin.c \
+	   ../libinstaller/ldlinux_bin.c
+OBJS	 = $(patsubst %.c,%.o,$(notdir $(SRCS)))
+
+.SUFFIXES: .c .o .i .s .S
+
+VPATH = $(SRC):$(SRC)/../libinstaller:$(OBJ)/../libinstaller
+
+all: installer
+
+tidy dist:
+	-rm -f *.o *.i *.s *.a .*.d *.tmp
+
+clean: tidy
+	-rm -f syslinux syslinux-nomtools
+
+spotless: clean
+	-rm -f *~
+
+installer: syslinux syslinux-nomtools
+
+syslinux: $(OBJS)
+	$(CC) $(LDFLAGS) -o $@ $^
+
+syslinux-nomtools: syslinux
+	ln -f $< $@
+
+strip:
+	$(STRIP) syslinux syslinux-nomtools
+
+%.o: %.c
+	$(CC) $(UMAKEDEPS) $(CFLAGS) -c -o $@ $<
+%.i: %.c
+	$(CC) $(UMAKEDEPS) $(CFLAGS) -E -o $@ $<
+%.s: %.c
+	$(CC) $(UMAKEDEPS) $(CFLAGS) -S -o $@ $<
+
+-include .*.d
diff --git a/linux/syslinux.c b/linux/syslinux.c
new file mode 100755
index 0000000..912de71
--- /dev/null
+++ b/linux/syslinux.c
@@ -0,0 +1,535 @@
+/* ----------------------------------------------------------------------- *
+ *
+ *   Copyright 1998-2008 H. Peter Anvin - All Rights Reserved
+ *   Copyright 2009-2010 Intel Corporation; author: H. Peter Anvin
+ *
+ *   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, Inc., 53 Temple Place Ste 330,
+ *   Boston MA 02111-1307, USA; either version 2 of the License, or
+ *   (at your option) any later version; incorporated herein by reference.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * syslinux.c - Linux installer program for SYSLINUX
+ *
+ * This is Linux-specific by now.
+ *
+ * This is an alternate version of the installer which doesn't require
+ * mtools, but requires root privilege.
+ */
+
+/*
+ * If DO_DIRECT_MOUNT is 0, call mount(8)
+ * If DO_DIRECT_MOUNT is 1, call mount(2)
+ */
+#ifdef __KLIBC__
+# define DO_DIRECT_MOUNT 1
+#else
+# define DO_DIRECT_MOUNT 0	/* glibc has broken losetup ioctls */
+#endif
+
+#define _GNU_SOURCE
+#define _XOPEN_SOURCE 500	/* For pread() pwrite() */
+#define _FILE_OFFSET_BITS 64
+#include <alloca.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <paths.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <inttypes.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/mount.h>
+
+#include "linuxioctl.h"
+
+#include <paths.h>
+#ifndef _PATH_MOUNT
+# define _PATH_MOUNT "/bin/mount"
+#endif
+#ifndef _PATH_UMOUNT
+# define _PATH_UMOUNT "/bin/umount"
+#endif
+#ifndef _PATH_TMP
+# define _PATH_TMP "/tmp/"
+#endif
+
+#include "syslinux.h"
+
+#if DO_DIRECT_MOUNT
+# include <linux/loop.h>
+#endif
+
+#include <getopt.h>
+#include <sysexits.h>
+#include "syslxcom.h"
+#include "syslxfs.h"
+#include "setadv.h"
+#include "syslxopt.h" /* unified options */
+
+extern const char *program;	/* Name of program */
+
+pid_t mypid;
+char *mntpath = NULL;		/* Path on which to mount */
+
+#if DO_DIRECT_MOUNT
+int loop_fd = -1;		/* Loop device */
+#endif
+
+void __attribute__ ((noreturn)) die(const char *msg)
+{
+    fprintf(stderr, "%s: %s\n", program, msg);
+
+#if DO_DIRECT_MOUNT
+    if (loop_fd != -1) {
+	ioctl(loop_fd, LOOP_CLR_FD, 0);	/* Free loop device */
+	close(loop_fd);
+	loop_fd = -1;
+    }
+#endif
+
+    if (mntpath)
+	unlink(mntpath);
+
+    exit(1);
+}
+
+/*
+ * Mount routine
+ */
+int do_mount(int dev_fd, int *cookie, const char *mntpath, const char *fstype)
+{
+    struct stat st;
+
+    (void)cookie;
+
+    if (fstat(dev_fd, &st) < 0)
+	return errno;
+
+#if DO_DIRECT_MOUNT
+    {
+	if (!S_ISBLK(st.st_mode)) {
+	    /* It's file, need to mount it loopback */
+	    unsigned int n = 0;
+	    struct loop_info64 loopinfo;
+	    int loop_fd;
+
+	    for (n = 0; loop_fd < 0; n++) {
+		snprintf(devfdname, sizeof devfdname, "/dev/loop%u", n);
+		loop_fd = open(devfdname, O_RDWR);
+		if (loop_fd < 0 && errno == ENOENT) {
+		    die("no available loopback device!");
+		}
+		if (ioctl(loop_fd, LOOP_SET_FD, (void *)dev_fd)) {
+		    close(loop_fd);
+		    loop_fd = -1;
+		    if (errno != EBUSY)
+			die("cannot set up loopback device");
+		    else
+			continue;
+		}
+
+		if (ioctl(loop_fd, LOOP_GET_STATUS64, &loopinfo) ||
+		    (loopinfo.lo_offset = opt.offset,
+		     ioctl(loop_fd, LOOP_SET_STATUS64, &loopinfo)))
+		    die("cannot set up loopback device");
+	    }
+
+	    *cookie = loop_fd;
+	} else {
+	    snprintf(devfdname, sizeof devfdname, "/proc/%lu/fd/%d",
+		     (unsigned long)mypid, dev_fd);
+	    *cookie = -1;
+	}
+
+	return mount(devfdname, mntpath, fstype,
+		     MS_NOEXEC | MS_NOSUID, "umask=077,quiet");
+    }
+#else
+    {
+	char devfdname[128], mnt_opts[128];
+	pid_t f, w;
+	int status;
+
+	snprintf(devfdname, sizeof devfdname, "/proc/%lu/fd/%d",
+		 (unsigned long)mypid, dev_fd);
+
+	f = fork();
+	if (f < 0) {
+	    return -1;
+	} else if (f == 0) {
+	    if (!S_ISBLK(st.st_mode)) {
+		snprintf(mnt_opts, sizeof mnt_opts,
+			 "rw,nodev,noexec,loop,offset=%llu,umask=077,quiet",
+			 (unsigned long long)opt.offset);
+	    } else {
+		snprintf(mnt_opts, sizeof mnt_opts,
+			 "rw,nodev,noexec,umask=077,quiet");
+	    }
+	    execl(_PATH_MOUNT, _PATH_MOUNT, "-t", fstype, "-o", mnt_opts,
+		  devfdname, mntpath, NULL);
+	    _exit(255);		/* execl failed */
+	}
+
+	w = waitpid(f, &status, 0);
+	return (w != f || status) ? -1 : 0;
+    }
+#endif
+}
+
+/*
+ * umount routine
+ */
+void do_umount(const char *mntpath, int cookie)
+{
+#if DO_DIRECT_MOUNT
+    int loop_fd = cookie;
+
+    if (umount2(mntpath, 0))
+	die("could not umount path");
+
+    if (loop_fd != -1) {
+	ioctl(loop_fd, LOOP_CLR_FD, 0);	/* Free loop device */
+	close(loop_fd);
+	loop_fd = -1;
+    }
+#else
+    pid_t f = fork();
+    pid_t w;
+    int status;
+    (void)cookie;
+
+    if (f < 0) {
+	perror("fork");
+	exit(1);
+    } else if (f == 0) {
+	execl(_PATH_UMOUNT, _PATH_UMOUNT, mntpath, NULL);
+    }
+
+    w = waitpid(f, &status, 0);
+    if (w != f || status) {
+	exit(1);
+    }
+#endif
+}
+
+/*
+ * Modify the ADV of an existing installation
+ */
+int modify_existing_adv(const char *path)
+{
+    if (opt.reset_adv)
+	syslinux_reset_adv(syslinux_adv);
+    else if (read_adv(path, "ldlinux.sys") < 0)
+	return 1;
+
+    if (modify_adv() < 0)
+	return 1;
+
+    if (write_adv(path, "ldlinux.sys") < 0)
+	return 1;
+
+    return 0;
+}
+
+int do_open_file(char *name)
+{
+    int fd;
+
+    if ((fd = open(name, O_RDONLY)) >= 0) {
+	uint32_t zero_attr = 0;
+	ioctl(fd, FAT_IOCTL_SET_ATTRIBUTES, &zero_attr);
+	close(fd);
+    }
+
+    unlink(name);
+    fd = open(name, O_WRONLY | O_CREAT | O_TRUNC, 0444);
+    if (fd < 0)
+	perror(name);
+
+    return fd;
+}
+
+int main(int argc, char *argv[])
+{
+    static unsigned char sectbuf[SECTOR_SIZE];
+    int dev_fd, fd;
+    struct stat st;
+    int err = 0;
+    char mntname[128];
+    char *ldlinux_name;
+    char *ldlinux_path;
+    char *subdir;
+    sector_t *sectors = NULL;
+    int ldlinux_sectors = (boot_image_len + SECTOR_SIZE - 1) >> SECTOR_SHIFT;
+    const char *errmsg;
+    int mnt_cookie;
+    int patch_sectors;
+    int i, rv;
+
+    mypid = getpid();
+    umask(077);
+    parse_options(argc, argv, MODE_SYSLINUX);
+
+    /* Note: subdir is guaranteed to start and end in / */
+    if (opt.directory && opt.directory[0]) {
+	int len = strlen(opt.directory);
+	int rv = asprintf(&subdir, "%s%s%s",
+			  opt.directory[0] == '/' ? "" : "/",
+			  opt.directory,
+			  opt.directory[len-1] == '/' ? "" : "/");
+	if (rv < 0 || !subdir) {
+	    perror(program);
+	    exit(1);
+	}
+    } else {
+	subdir = "/";
+    }
+
+    if (!opt.device || opt.install_mbr || opt.activate_partition)
+	usage(EX_USAGE, MODE_SYSLINUX);
+
+    /*
+     * First make sure we can open the device at all, and that we have
+     * read/write permission.
+     */
+    dev_fd = open(opt.device, O_RDWR);
+    if (dev_fd < 0 || fstat(dev_fd, &st) < 0) {
+	perror(opt.device);
+	exit(1);
+    }
+
+    if (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode)) {
+	die("not a device or regular file");
+    }
+
+    if (opt.offset && S_ISBLK(st.st_mode)) {
+	die("can't combine an offset with a block device");
+    }
+
+    xpread(dev_fd, sectbuf, SECTOR_SIZE, opt.offset);
+    fsync(dev_fd);
+
+    /*
+     * Check to see that what we got was indeed an FAT/NTFS
+     * boot sector/superblock
+     */
+    if ((errmsg = syslinux_check_bootsect(sectbuf, &fs_type))) {
+	fprintf(stderr, "%s: %s\n", opt.device, errmsg);
+	exit(1);
+    }
+
+    /*
+     * Now mount the device.
+     */
+    if (geteuid()) {
+	die("This program needs root privilege");
+    } else {
+	int i = 0;
+	struct stat dst;
+	int rv;
+
+	/* We're root or at least setuid.
+	   Make a temp dir and pass all the gunky options to mount. */
+
+	if (chdir(_PATH_TMP)) {
+	    fprintf(stderr, "%s: Cannot access the %s directory.\n",
+		    program, _PATH_TMP);
+	    exit(1);
+	}
+#define TMP_MODE (S_IXUSR|S_IWUSR|S_IXGRP|S_IWGRP|S_IWOTH|S_IXOTH|S_ISVTX)
+
+	if (stat(".", &dst) || !S_ISDIR(dst.st_mode) ||
+	    (dst.st_mode & TMP_MODE) != TMP_MODE) {
+	    die("possibly unsafe " _PATH_TMP " permissions");
+	}
+
+	for (i = 0;; i++) {
+	    snprintf(mntname, sizeof mntname, "syslinux.mnt.%lu.%d",
+		     (unsigned long)mypid, i);
+
+	    if (lstat(mntname, &dst) != -1 || errno != ENOENT)
+		continue;
+
+	    rv = mkdir(mntname, 0000);
+
+	    if (rv == -1) {
+		if (errno == EEXIST || errno == EINTR)
+		    continue;
+		perror(program);
+		exit(1);
+	    }
+
+	    if (lstat(mntname, &dst) || dst.st_mode != (S_IFDIR | 0000) ||
+		dst.st_uid != 0) {
+		die("someone is trying to symlink race us!");
+	    }
+	    break;		/* OK, got something... */
+	}
+
+	mntpath = mntname;
+    }
+
+    if (fs_type == VFAT) {
+        if (do_mount(dev_fd, &mnt_cookie, mntpath, "vfat") &&
+            do_mount(dev_fd, &mnt_cookie, mntpath, "msdos")) {
+            rmdir(mntpath);
+            die("failed on mounting fat volume");
+        }
+    } else if (fs_type == NTFS) {
+        if (do_mount(dev_fd, &mnt_cookie, mntpath, "ntfs-3g")) {
+            rmdir(mntpath);
+            die("failed on mounting ntfs volume");
+        }
+    }
+
+    ldlinux_path = alloca(strlen(mntpath) + strlen(subdir) + 1);
+    sprintf(ldlinux_path, "%s%s", mntpath, subdir);
+
+    ldlinux_name = alloca(strlen(ldlinux_path) + 14);
+    if (!ldlinux_name) {
+	perror(program);
+	err = 1;
+	goto umount;
+    }
+    sprintf(ldlinux_name, "%sldlinux.sys", ldlinux_path);
+
+    /* update ADV only ? */
+    if (opt.update_only == -1) {
+	if (opt.reset_adv || opt.set_once) {
+	    modify_existing_adv(ldlinux_path);
+	    do_umount(mntpath, mnt_cookie);
+	    sync();
+	    rmdir(mntpath);
+	    exit(0);
+    } else if (opt.update_only && !syslinux_already_installed(dev_fd)) {
+        fprintf(stderr, "%s: no previous syslinux boot sector found\n",
+                argv[0]);
+        exit(1);
+	} else {
+	    fprintf(stderr, "%s: please specify --install or --update for the future\n", argv[0]);
+	    opt.update_only = 0;
+	}
+    }
+
+    /* Read a pre-existing ADV, if already installed */
+    if (opt.reset_adv)
+	syslinux_reset_adv(syslinux_adv);
+    else if (read_adv(ldlinux_path, "ldlinux.sys") < 0)
+	syslinux_reset_adv(syslinux_adv);
+    if (modify_adv() < 0)
+	exit(1);
+
+    fd = do_open_file(ldlinux_name);
+    if (fd < 0) {
+	err = 1;
+	goto umount;
+    }
+
+    /* Write it the first time */
+    if (xpwrite(fd, (const char _force *)boot_image, boot_image_len, 0)
+	!= (int)boot_image_len ||
+	xpwrite(fd, syslinux_adv, 2 * ADV_SIZE,
+		boot_image_len) != 2 * ADV_SIZE) {
+	fprintf(stderr, "%s: write failure on %s\n", program, ldlinux_name);
+	exit(1);
+    }
+
+    fsync(fd);
+    /*
+     * Set the attributes
+     */
+    {
+	uint32_t attr = 0x07;	/* Hidden+System+Readonly */
+	ioctl(fd, FAT_IOCTL_SET_ATTRIBUTES, &attr);
+    }
+
+    /*
+     * Create a block map.
+     */
+    ldlinux_sectors += 2; /* 2 ADV sectors */
+    sectors = calloc(ldlinux_sectors, sizeof *sectors);
+    if (sectmap(fd, sectors, ldlinux_sectors)) {
+	perror("bmap");
+	exit(1);
+    }
+    close(fd);
+    sync();
+
+    sprintf(ldlinux_name, "%sldlinux.c32", ldlinux_path);
+    fd = do_open_file(ldlinux_name);
+    if (fd < 0) {
+	err = 1;
+	goto umount;
+    }
+
+    rv = xpwrite(fd, (const char _force *)syslinux_ldlinuxc32,
+		 syslinux_ldlinuxc32_len, 0);
+    if (rv != (int)syslinux_ldlinuxc32_len) {
+	fprintf(stderr, "%s: write failure on %s\n", program, ldlinux_name);
+	exit(1);
+    }
+
+    fsync(fd);
+    /*
+     * Set the attributes
+     */
+    {
+	uint32_t attr = 0x07;	/* Hidden+System+Readonly */
+	ioctl(fd, FAT_IOCTL_SET_ATTRIBUTES, &attr);
+    }
+
+    close(fd);
+    sync();
+
+umount:
+    do_umount(mntpath, mnt_cookie);
+    sync();
+    rmdir(mntpath);
+
+    if (err)
+	exit(err);
+
+    /*
+     * Patch ldlinux.sys and the boot sector
+     */
+    i = syslinux_patch(sectors, ldlinux_sectors, opt.stupid_mode,
+		       opt.raid_mode, subdir, NULL);
+    patch_sectors = (i + SECTOR_SIZE - 1) >> SECTOR_SHIFT;
+
+    /*
+     * Write the now-patched first sectors of ldlinux.sys
+     */
+    for (i = 0; i < patch_sectors; i++) {
+	xpwrite(dev_fd,
+		(const char _force *)boot_image + i * SECTOR_SIZE,
+		SECTOR_SIZE,
+		opt.offset + ((off_t) sectors[i] << SECTOR_SHIFT));
+    }
+
+    /*
+     * To finish up, write the boot sector
+     */
+
+    /* Read the superblock again since it might have changed while mounted */
+    xpread(dev_fd, sectbuf, SECTOR_SIZE, opt.offset);
+
+    /* Copy the syslinux code into the boot sector */
+    syslinux_make_bootsect(sectbuf, fs_type);
+
+    /* Write new boot sector */
+    xpwrite(dev_fd, sectbuf, SECTOR_SIZE, opt.offset);
+
+    close(dev_fd);
+    sync();
+
+    /* Done! */
+
+    return 0;
+}