copy.c

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