Merge branch 'esr/maint-doc-fast-import'
[git.git] / copy.c
bloba7f58fd905b31b2634f74580090ec664a640e279
1 #include "cache.h"
3 int copy_fd(int ifd, int ofd)
5 while (1) {
6 char buffer[8192];
7 char *buf = buffer;
8 ssize_t len = xread(ifd, buffer, sizeof(buffer));
9 if (!len)
10 break;
11 if (len < 0) {
12 int read_error = errno;
13 close(ifd);
14 return error("copy-fd: read returned %s",
15 strerror(read_error));
17 while (len) {
18 int written = xwrite(ofd, buf, len);
19 if (written > 0) {
20 buf += written;
21 len -= written;
23 else if (!written) {
24 close(ifd);
25 return error("copy-fd: write returned 0");
26 } else {
27 int write_error = errno;
28 close(ifd);
29 return error("copy-fd: write returned %s",
30 strerror(write_error));
34 close(ifd);
35 return 0;
38 static int copy_times(const char *dst, const char *src)
40 struct stat st;
41 struct utimbuf times;
42 if (stat(src, &st) < 0)
43 return -1;
44 times.actime = st.st_atime;
45 times.modtime = st.st_mtime;
46 if (utime(dst, &times) < 0)
47 return -1;
48 return 0;
51 int copy_file(const char *dst, const char *src, int mode)
53 int fdi, fdo, status;
55 mode = (mode & 0111) ? 0777 : 0666;
56 if ((fdi = open(src, O_RDONLY)) < 0)
57 return fdi;
58 if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
59 close(fdi);
60 return fdo;
62 status = copy_fd(fdi, fdo);
63 if (close(fdo) != 0)
64 return error("%s: close error: %s", dst, strerror(errno));
66 if (!status && adjust_shared_perm(dst))
67 return -1;
69 return status;
72 int copy_file_with_time(const char *dst, const char *src, int mode)
74 int status = copy_file(dst, src, mode);
75 if (!status)
76 return copy_times(dst, src);
77 return status;