archive.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "attr.h"
   4
   5 static 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, "$Format:", 8);
  19                 if (!b)
  20                         break;
  21                 c = memchr(b + 8, '$', (src + len) - b - 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
  38 static 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
  62 void *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