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/* Copyright (C) 2005 J.F.Dockes
* 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "autoconfig.h"
#include "copyfile.h"
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include "safeunistd.h"
#ifndef _WIN32
#include <sys/time.h>
#include <utime.h>
#include <sys/stat.h>
#endif
#include <cstring>
#include "pathut.h"
#include "log.h"
using namespace std;
#define CPBSIZ 8192
bool copyfile(const char *src, const char *dst, string &reason, int flags)
{
int sfd = -1;
int dfd = -1;
bool ret = false;
char buf[CPBSIZ];
int oflags = O_WRONLY|O_CREAT|O_TRUNC|O_BINARY;
LOGDEB("copyfile: " << (src) << " to " << (dst) << "\n" );
if ((sfd = ::open(src, O_RDONLY, 0)) < 0) {
reason += string("open ") + src + ": " + strerror(errno);
goto out;
}
if (flags & COPYFILE_EXCL) {
oflags |= O_EXCL;
}
if ((dfd = ::open(dst, oflags, 0644)) < 0) {
reason += string("open/creat ") + dst + ": " + strerror(errno);
// If we fail because of an open/truncate error, we do not
// want to unlink the file, we might succeed...
flags |= COPYFILE_NOERRUNLINK;
goto out;
}
for (;;) {
auto didread = sys_read(sfd, buf, CPBSIZ);
if (didread < 0) {
reason += string("read src ") + src + ": " + strerror(errno);
goto out;
}
if (didread == 0)
break;
if (sys_write(dfd, buf, didread) != didread) {
reason += string("write dst ") + src + ": " + strerror(errno);
goto out;
}
}
ret = true;
out:
if (ret == false && !(flags©FILE_NOERRUNLINK))
path_unlink(dst);
if (sfd >= 0)
::close(sfd);
if (dfd >= 0)
::close(dfd);
return ret;
}
bool stringtofile(const string& dt, const char *dst, string& reason,
int flags)
{
LOGDEB("stringtofile:\n" );
int dfd = -1;
bool ret = false;
int oflags = O_WRONLY|O_CREAT|O_TRUNC|O_BINARY;
LOGDEB("stringtofile: " << ((unsigned int)dt.size()) << " bytes to " << (dst) << "\n" );
if (flags & COPYFILE_EXCL) {
oflags |= O_EXCL;
}
if ((dfd = ::open(dst, oflags, 0644)) < 0) {
reason += string("open/creat ") + dst + ": " + strerror(errno);
// If we fail because of an open/truncate error, we do not
// want to unlink the file, we might succeed...
flags |= COPYFILE_NOERRUNLINK;
goto out;
}
if (sys_write(dfd, dt.c_str(), dt.size()) != static_cast<ssize_t>(dt.size())) {
reason += string("write dst ") + ": " + strerror(errno);
goto out;
}
ret = true;
out:
if (ret == false && !(flags©FILE_NOERRUNLINK))
path_unlink(dst);
if (dfd >= 0)
::close(dfd);
return ret;
}
bool renameormove(const char *src, const char *dst, string &reason)
{
#ifdef _WIN32
// Windows refuses to rename to an existing file. It appears that
// there are workarounds (See MoveFile, MoveFileTransacted), but
// anyway we are not expecting atomicity here.
path_unlink(dst);
#endif
// First try rename(2). If this succeeds we're done. If this fails
// with EXDEV, try to copy. Unix really should have a library function
// for this.
if (rename(src, dst) == 0) {
return true;
}
if (errno != EXDEV) {
reason += string("rename(2) failed: ") + strerror(errno);
return false;
}
if (!copyfile(src, dst, reason))
return false;
#ifndef _WIN32
struct stat st;
if (stat(src, &st) < 0) {
reason += string("Can't stat ") + src + " : " + strerror(errno);
return false;
}
struct stat st1;
if (stat(dst, &st1) < 0) {
reason += string("Can't stat ") + dst + " : " + strerror(errno);
return false;
}
// Try to preserve modes, owner, times. This may fail for a number
// of reasons
if ((st1.st_mode & 0777) != (st.st_mode & 0777)) {
if (chmod(dst, st.st_mode&0777) != 0) {
reason += string("Chmod ") + dst + "Error : " + strerror(errno);
}
}
if (st.st_uid != st1.st_uid || st.st_gid != st1.st_gid) {
if (chown(dst, st.st_uid, st.st_gid) != 0) {
reason += string("Chown ") + dst + "Error : " + strerror(errno);
}
}
#endif
struct PathStat pst;
path_fileprops(src, &pst);
struct path_timeval times[2];
times[0].tv_sec = time(0);
times[0].tv_usec = 0;
times[1].tv_sec = pst.pst_mtime;
times[1].tv_usec = 0;
path_utimes(dst, times);
// All ok, get rid of origin
if (!path_unlink(src)) {
reason += string("Can't unlink ") + src + "Error : " + strerror(errno);
}
return true;
}
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