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/*
* qemubuilder: pbuilder with qemu
* Basic file operations code.
*
* Copyright (C) 2009 Junichi Uekawa
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
/**
copy file contents to temporary filesystem, so that it can be used
inside qemu.
return -1
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <assert.h>
#include <alloca.h>
#include <errno.h>
#include "file.h"
#include "log.h"
/**
* Copy file from orig to dest.
*
* returns 0 on success, -1 on failure.
*/
int copy_file(const char *orig, const char *dest) {
const int buffer_size = 4096;
char *buf = malloc(buffer_size);
int ret = -1;
int fin = -1;
int fout = -1;
size_t count;
struct stat st;
if (!buf) {
log_printf(log_error, "Out of memory");
goto out;
}
if (-1 == (fin = open(orig, O_RDONLY))) {
log_perror("file copy: open for read");
goto out;
}
if (-1 == (fout = creat(dest, 0666))) {
log_perror("file copy: open for write");
goto out;
}
while ((count = read(fin, buf, buffer_size)) > 0) {
if (-1 == write(fout, buf, count)) { /* error */
log_perror("file copy: write");
log_printf(log_error, "%i", fin);
log_printf(log_error, "%i %i", fout, (int)count);
goto out;
}
}
if (count == -1) {
log_perror("file copy: read ");
goto out;
}
if (-1 == close(fin) || -1 == close(fout)) {
log_perror("file copy: close ");
goto out;
}
if (0 > stat(orig, &st)) {
log_printf(
log_error, "Error calling stat '%s': %s", orig, strerror(errno));
goto out;
}
if (chmod(dest, st.st_mode)) {
log_printf(log_error,
"Error calling chmod('%s' 0%llo): %s",
orig,
(unsigned long long)st.st_mode,
strerror(errno));
goto out;
}
ret = 0;
out:
free(buf);
return ret;
}
/**
Create sparse file of specified size.
returns 0 on success, 1 on fail.
*/
int create_sparse_file(const char *filename, unsigned long int size) {
int fd = creat(filename, 0660);
if (-1 == fd) {
log_perror("creat");
log_printf(log_error, "Could not create %s", filename);
return 1;
}
const off_t seeksize = 1 << 30; /* try with 30-bit seeks (1GB / seek) */
assert(size > 1);
size--;
if (-1 == lseek(fd, 0, SEEK_SET)) {
log_perror("initial lseek");
return 1;
}
while (size > seeksize) {
if (-1 == lseek(fd, seeksize, SEEK_CUR)) {
log_perror("intermediate lseek");
return 1;
}
size -= seeksize;
}
if (-1 == lseek(fd, size - 1, SEEK_CUR)) {
log_perror("final lseek");
return 1;
}
if (-1 ==
write(fd, "", 1)) /* A string consists of \0, write 0 to end of file */
{
log_perror("write");
return 1;
}
if (-1 == close(fd)) {
log_perror("close");
return 1;
}
return 0;
}
/* mknod with prepended pathname
return -1 on failure.
*/
int mknod_inside_chroot(const char *chroot,
const char *pathname,
mode_t mode,
dev_t dev) {
char *p = alloca(strlen(chroot) + strlen(pathname) + 2);
int ret;
if (!p) {
log_printf(log_error, "error on alloca");
return -1;
}
if (-1 == sprintf(p, "%s/%s", chroot, pathname)) {
log_printf(log_error, "error on sprintf");
return -1;
}
ret = mknod(p, mode, dev);
if (ret == -1) {
/* output the error message for debug, but ignore it here. */
log_perror(p);
}
return ret;
}
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