Mercurial > dovecot > core-2.2

annotate src/lib/file-copy.c @ 22664:fea53c2725c0

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director: Fix director_max_parallel_moves/kicks type Should be uint, not time.
author Timo Sirainen <timo.sirainen@dovecot.fi>
date Thu, 09 Nov 2017 12:24:16 +0200
parents 2e2563132d5f
children cb108f786fb4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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2e2563132d5f Updated copyright notices to include the year 2017.
Stephan Bosch <stephan.bosch@dovecot.fi>
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1 /* Copyright (c) 2006-2017 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 (i_unlink_if_exists(tmppath) < 0)
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29 return -1;
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30 if (link(srcpath, tmppath) == 0)
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31 return 1;
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32 }
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33 if (errno == ENOENT)
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34 return 0;
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35 if (!ECANTLINK(errno)) {
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36 i_error("link(%s, %s) failed: %m", srcpath, tmppath);
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37 return -1;
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38 }
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39
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40 /* fallback to manual copying */
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41 }
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42
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43 fd_in = open(srcpath, O_RDONLY);
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44 if (fd_in == -1) {
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45 if (errno == ENOENT)
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46 return 0;
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47 i_error("open(%s) failed: %m", srcpath);
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48 return -1;
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49 }
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50
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51 if (fstat(fd_in, &st) < 0) {
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52 i_error("fstat(%s) failed: %m", srcpath);
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53 i_close_fd(&fd_in);
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54 return -1;
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55 }
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56
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57 old_umask = umask(0);
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58 fd_out = open(tmppath, O_WRONLY | O_CREAT | O_TRUNC, st.st_mode);
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59 umask(old_umask);
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60 if (fd_out == -1) {
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61 i_error("open(%s, O_CREAT) failed: %m", tmppath);
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62 i_close_fd(&fd_in);
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63 return -1;
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64 }
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65
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66 /* try to change the group, don't really care if it fails */
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67 if (fchown(fd_out, (uid_t)-1, st.st_gid) < 0 && errno != EPERM)
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68 i_error("fchown(%s) failed: %m", tmppath);
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69
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70 input = i_stream_create_fd(fd_in, IO_BLOCK_SIZE, FALSE);
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71 output = o_stream_create_fd_file(fd_out, 0, FALSE);
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72
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73 while ((ret = o_stream_send_istream(output, input)) > 0) ;
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74
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75 if (ret < 0)
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76 i_error("write(%s) failed: %m", tmppath);
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77
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78 i_stream_destroy(&input);
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79 o_stream_destroy(&output);
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80
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81 if (close(fd_in) < 0) {
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82 i_error("close(%s) failed: %m", srcpath);
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83 ret = -1;
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84 }
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85 if (close(fd_out) < 0) {
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86 i_error("close(%s) failed: %m", tmppath);
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87 ret = -1;
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88 }
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89 return ret < 0 ? -1 : 1;
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90 }
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91
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92 int file_copy(const char *srcpath, const char *destpath, bool try_hardlink)
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93 {
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94 int ret;
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95
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96 T_BEGIN {
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97 const char *tmppath;
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98
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99 tmppath = t_strconcat(destpath, ".tmp", NULL);
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100
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101 ret = file_copy_to_tmp(srcpath, tmppath, try_hardlink);
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102 if (ret > 0) {
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103 if (rename(tmppath, destpath) < 0) {
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104 i_error("rename(%s, %s) failed: %m",
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105 tmppath, destpath);
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106 ret = -1;
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107 }
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108 }
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109 if (ret < 0)
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110 i_unlink(tmppath);
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111 } T_END;
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112 return ret;
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113 }