copy.c: copy_fd - correctly report write errors
[git/git.git] / archive.c
CommitLineData
18125644
LH
1#include "cache.h"
2#include "commit.h"
3#include "attr.h"
4
5static void format_subst(const struct commit *commit,
6 const char *src, size_t len,
7 struct strbuf *buf)
8{
9 char *to_free = NULL;
10 struct strbuf fmt;
11
12 if (src == buf->buf)
13 to_free = strbuf_detach(buf, NULL);
14 strbuf_init(&fmt, 0);
15 for (;;) {
16 const char *b, *c;
17
18 b = memmem(src, len, "$Format:", 8);
19 if (!b || src + len < b + 9)
20 break;
21 c = memchr(b + 8, '$', len - 8);
22 if (!c)
23 break;
24
25 strbuf_reset(&fmt);
26 strbuf_add(&fmt, b + 8, c - b - 8);
27
28 strbuf_add(buf, src, b - src);
29 format_commit_message(commit, fmt.buf, buf);
30 len -= c + 1 - src;
31 src = c + 1;
32 }
33 strbuf_add(buf, src, len);
34 strbuf_release(&fmt);
35 free(to_free);
36}
37
38static int convert_to_archive(const char *path,
39 const void *src, size_t len,
40 struct strbuf *buf,
41 const struct commit *commit)
42{
43 static struct git_attr *attr_export_subst;
44 struct git_attr_check check[1];
45
46 if (!commit)
47 return 0;
48
49 if (!attr_export_subst)
50 attr_export_subst = git_attr("export-subst", 12);
51
52 check[0].attr = attr_export_subst;
53 if (git_checkattr(path, ARRAY_SIZE(check), check))
54 return 0;
55 if (!ATTR_TRUE(check[0].value))
56 return 0;
57
58 format_subst(commit, src, len, buf);
59 return 1;
60}
61
62void *sha1_file_to_archive(const char *path, const unsigned char *sha1,
63 unsigned int mode, enum object_type *type,
64 unsigned long *sizep,
65 const struct commit *commit)
66{
67 void *buffer;
68
69 buffer = read_sha1_file(sha1, type, sizep);
70 if (buffer && S_ISREG(mode)) {
71 struct strbuf buf;
72 size_t size = 0;
73
74 strbuf_init(&buf, 0);
75 strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
76 convert_to_working_tree(path, buf.buf, buf.len, &buf);
77 convert_to_archive(path, buf.buf, buf.len, &buf, commit);
78 buffer = strbuf_detach(&buf, &size);
79 *sizep = size;
80 }
81
82 return buffer;
83}
84