copy.c

   1 #include "git-compat-util.h"
   2 #include "copy.h"
   3 #include "path.h"
   4 #include "gettext.h"
   5 #include "strbuf.h"
   6 #include "abspath.h"
   7
   8 int copy_fd(int ifd, int ofd)
   9 {
  10         while (1) {
  11                 char buffer[8192];
  12                 ssize_t len = xread(ifd, buffer, sizeof(buffer));
  13                 if (!len)
  14                         break;
  15                 if (len < 0)
  16                         return COPY_READ_ERROR;
  17                 if (write_in_full(ofd, buffer, len) < 0)
  18                         return COPY_WRITE_ERROR;
  19         }
  20         return 0;
  21 }
  22
  23 static int copy_times(const char *dst, const char *src)
  24 {
  25         struct stat st;
  26         struct utimbuf times;
  27         if (stat(src, &st) < 0)
  28                 return -1;
  29         times.actime = st.st_atime;
  30         times.modtime = st.st_mtime;
  31         if (utime(dst, &times) < 0)
  32                 return -1;
  33         return 0;
  34 }
  35
  36 int copy_file(const char *dst, const char *src, int mode)
  37 {
  38         int fdi, fdo, status;
  39
  40         mode = (mode & 0111) ? 0777 : 0666;
  41         if ((fdi = open(src, O_RDONLY)) < 0)
  42                 return fdi;
  43         if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
  44                 close(fdi);
  45                 return fdo;
  46         }
  47         status = copy_fd(fdi, fdo);
  48         switch (status) {
  49         case COPY_READ_ERROR:
  50                 error_errno("copy-fd: read returned");
  51                 break;
  52         case COPY_WRITE_ERROR:
  53                 error_errno("copy-fd: write returned");
  54                 break;
  55         }
  56         close(fdi);
  57         if (close(fdo) != 0)
  58                 return error_errno("%s: close error", dst);
  59
  60         if (!status && adjust_shared_perm(dst))
  61                 return -1;
  62
  63         return status;
  64 }
  65
  66 int copy_file_with_time(const char *dst, const char *src, int mode)
  67 {
  68         int status = copy_file(dst, src, mode);
  69         if (!status)
  70                 return copy_times(dst, src);
  71         return status;
  72 }