Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/lib/file-copy.c @ 9532:00cd9aacd03c HEAD

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Updated copyright notices to include year 2010.
author Timo Sirainen <tss@iki.fi>
date Mon, 25 Jan 2010 01:18:58 +0200
parents b9faf4db2a9f
children
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9532
00cd9aacd03c Updated copyright notices to include year 2010.
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1 /* Copyright (c) 2006-2010 Dovecot authors, see the included COPYING file */
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2
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3 #include "lib.h"
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4 #include "istream.h"
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5 #include "ostream.h"
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6 #include "file-copy.h"
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7
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8 #include <stdio.h>
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9 #include <unistd.h>
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10 #include <fcntl.h>
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11 #include <sys/stat.h>
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12
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13 static int file_copy_to_tmp(const char *srcpath, const char *tmppath,
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14 bool try_hardlink)
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15 {
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16 struct istream *input;
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17 struct ostream *output;
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18 struct stat st;
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19 mode_t old_umask;
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20 int fd_in, fd_out;
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21 off_t ret;
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22
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23 if (try_hardlink) {
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24 /* see if hardlinking works */
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25 if (link(srcpath, tmppath) == 0)
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26 return 1;
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27 if (errno == EEXIST) {
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28 if (unlink(tmppath) < 0 && errno != ENOENT) {
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29 i_error("unlink(%s) failed: %m", tmppath);
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30 return -1;
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31 }
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32 if (link(srcpath, tmppath) == 0)
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33 return 1;
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34 }
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35 if (errno == ENOENT)
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36 return 0;
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37 if (!ECANTLINK(errno)) {
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38 i_error("link(%s, %s) failed: %m", srcpath, tmppath);
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39 return -1;
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40 }
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41
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42 /* fallback to manual copying */
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43 }
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44
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45 fd_in = open(srcpath, O_RDONLY);
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46 if (fd_in == -1) {
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47 if (errno == ENOENT)
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48 return 0;
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49 i_error("open(%s) failed: %m", srcpath);
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50 return -1;
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51 }
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52
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53 if (fstat(fd_in, &st) < 0) {
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54 i_error("fstat(%s) failed: %m", srcpath);
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55 (void)close(fd_in);
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56 return -1;
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57 }
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58
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59 old_umask = umask(0);
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60 fd_out = open(tmppath, O_WRONLY | O_CREAT | O_TRUNC, st.st_mode);
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61 umask(old_umask);
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62 if (fd_out == -1) {
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63 i_error("open(%s, O_CREAT) failed: %m", tmppath);
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64 (void)close(fd_in);
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65 return -1;
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66 }
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67
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68 /* try to change the group, don't really care if it fails */
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69 if (fchown(fd_out, (uid_t)-1, st.st_gid) < 0 && errno != EPERM)
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70 i_error("fchown(%s) failed: %m", tmppath);
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71
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72 input = i_stream_create_fd(fd_in, 0, FALSE);
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73 output = o_stream_create_fd_file(fd_out, 0, FALSE);
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74
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75 while ((ret = o_stream_send_istream(output, input)) > 0) ;
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76
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77 if (ret < 0)
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78 i_error("write(%s) failed: %m", tmppath);
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79
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80 i_stream_destroy(&input);
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81 o_stream_destroy(&output);
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82
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83 if (close(fd_in) < 0) {
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84 i_error("close(%s) failed: %m", srcpath);
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85 ret = -1;
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86 }
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87 if (close(fd_out) < 0) {
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88 i_error("close(%s) failed: %m", tmppath);
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89 ret = -1;
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90 }
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91 return ret < 0 ? -1 : 1;
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92 }
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93
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94 int file_copy(const char *srcpath, const char *destpath, bool try_hardlink)
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95 {
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96 int ret;
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97
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98 T_BEGIN {
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99 const char *tmppath;
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100
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101 tmppath = t_strconcat(destpath, ".tmp", NULL);
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102
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103 ret = file_copy_to_tmp(srcpath, tmppath, try_hardlink);
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104 if (ret > 0) {
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105 if (rename(tmppath, destpath) < 0) {
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106 i_error("rename(%s, %s) failed: %m",
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107 tmppath, destpath);
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108 ret = -1;
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109 }
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110 }
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111 if (ret < 0)
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112 (void)unlink(tmppath);
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113 } T_END;
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114 return ret;
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115 }