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Commit | Line | Data |
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1 | #include "cache.h" | |
2 | ||
3 | int copy_fd(int ifd, int ofd) | |
4 | { | |
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)); | |
16 | } | |
17 | while (len) { | |
18 | int written = xwrite(ofd, buf, len); | |
19 | if (written > 0) { | |
20 | buf += written; | |
21 | len -= written; | |
22 | } | |
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)); | |
31 | } | |
32 | } | |
33 | } | |
34 | close(ifd); | |
35 | return 0; | |
36 | } | |
37 | ||
38 | static int copy_times(const char *dst, const char *src) | |
39 | { | |
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, ×) < 0) | |
47 | return -1; | |
48 | return 0; | |
49 | } | |
50 | ||
51 | int copy_file(const char *dst, const char *src, int mode) | |
52 | { | |
53 | int fdi, fdo, status; | |
54 | ||
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; | |
61 | } | |
62 | status = copy_fd(fdi, fdo); | |
63 | if (close(fdo) != 0) | |
64 | return error("%s: close error: %s", dst, strerror(errno)); | |
65 | ||
66 | if (!status && adjust_shared_perm(dst)) | |
67 | return -1; | |
68 | ||
69 | return status; | |
70 | } | |
71 | ||
72 | int copy_file_with_time(const char *dst, const char *src, int mode) | |
73 | { | |
74 | int status = copy_file(dst, src, mode); | |
75 | if (!status) | |
76 | return copy_times(dst, src); | |
77 | return status; | |
78 | } |