Documentation/git-gc: explain --auto in description

diff --git a/builtin-archive.c b/builtin-archive.c
index 187491bc172571b783a0be4f4dfa3d94d58bb0fe..04385dea05110053db72e30a77e6d4a10bc7875b 100644 (file)
--- a/builtin-archive.c
+++ b/builtin-archive.c
@@ -10,6 +10,7 @@
 #include "exec_cmd.h"
 #include "pkt-line.h"
 #include "sideband.h"
+#include "attr.h"
 
 static const char archive_usage[] = \
 "git-archive --format=<fmt> [--prefix=<prefix>/] [--verbose] [<extra>] <tree-ish> [path...]";
@@ -80,6 +81,84 @@ static int run_remote_archiver(const char *remote, int argc,
        return !!rv;
 }
 
+static void format_subst(const struct commit *commit,
+                         const char *src, size_t len,
+                         struct strbuf *buf)
+{
+       char *to_free = NULL;
+       struct strbuf fmt;
+
+       if (src == buf->buf)
+               to_free = strbuf_detach(buf, NULL);
+       strbuf_init(&fmt, 0);
+       for (;;) {
+               const char *b, *c;
+
+               b = memmem(src, len, "$Format:", 8);
+               if (!b || src + len < b + 9)
+                       break;
+               c = memchr(b + 8, '$', len - 8);
+               if (!c)
+                       break;
+
+               strbuf_reset(&fmt);
+               strbuf_add(&fmt, b + 8, c - b - 8);
+
+               strbuf_add(buf, src, b - src);
+               format_commit_message(commit, fmt.buf, buf);
+               len -= c + 1 - src;
+               src  = c + 1;
+       }
+       strbuf_add(buf, src, len);
+       strbuf_release(&fmt);
+       free(to_free);
+}
+
+static int convert_to_archive(const char *path,
+                              const void *src, size_t len,
+                              struct strbuf *buf,
+                              const struct commit *commit)
+{
+       static struct git_attr *attr_export_subst;
+       struct git_attr_check check[1];
+
+       if (!commit)
+               return 0;
+
+       if (!attr_export_subst)
+               attr_export_subst = git_attr("export-subst", 12);
+
+       check[0].attr = attr_export_subst;
+       if (git_checkattr(path, ARRAY_SIZE(check), check))
+               return 0;
+       if (!ATTR_TRUE(check[0].value))
+               return 0;
+
+       format_subst(commit, src, len, buf);
+       return 1;
+}
+
+void *sha1_file_to_archive(const char *path, const unsigned char *sha1,
+                           unsigned int mode, enum object_type *type,
+                           unsigned long *sizep,
+                           const struct commit *commit)
+{
+       void *buffer;
+
+       buffer = read_sha1_file(sha1, type, sizep);
+       if (buffer && S_ISREG(mode)) {
+               struct strbuf buf;
+
+               strbuf_init(&buf, 0);
+               strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
+               convert_to_working_tree(path, buf.buf, buf.len, &buf);
+               convert_to_archive(path, buf.buf, buf.len, &buf, commit);
+               buffer = strbuf_detach(&buf, sizep);
+       }
+
+       return buffer;
+}
+
 static int init_archiver(const char *name, struct archiver *ar)
 {
        int rv = -1, i;
@@ -109,7 +188,7 @@ void parse_treeish_arg(const char **argv, struct archiver_args *ar_args,
        const unsigned char *commit_sha1;
        time_t archive_time;
        struct tree *tree;
-       struct commit *commit;
+       const struct commit *commit;
        unsigned char sha1[20];
 
        if (get_sha1(name, sha1))
@@ -142,6 +221,7 @@ void parse_treeish_arg(const char **argv, struct archiver_args *ar_args,
        }
        ar_args->tree = tree;
        ar_args->commit_sha1 = commit_sha1;
+       ar_args->commit = commit;
        ar_args->time = archive_time;
 }