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shallow: add setup_temporary_shallow()

This function is like setup_alternate_shallow() except that it does
not lock $GIT_DIR/shallow.  It is supposed to be used when a program
generates temporary shallow for use by another program, then throw
the shallow file away.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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1 parent 6a3bbb4 commit 08ea65ad13faaf24f57732cdc8af3d830d4b367f @pclouds pclouds committed with gitster Aug 16, 2013
Showing with 24 additions and 0 deletions.
  1. +1 −0 commit.h
  2. +23 −0 shallow.c
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@@ -201,6 +201,7 @@ extern void set_alternate_shallow_file(const char *path);
extern int write_shallow_commits(struct strbuf *out, int use_pack_protocol);
extern void setup_alternate_shallow(struct lock_file *shallow_lock,
const char **alternate_shallow_file);
+extern char *setup_temporary_shallow(void);
int is_descendant_of(struct commit *, struct commit_list *);
int in_merge_bases(struct commit *, struct commit *);
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@@ -175,6 +175,29 @@ int write_shallow_commits(struct strbuf *out, int use_pack_protocol)
return data.count;
}
+char *setup_temporary_shallow(void)
+{
+ struct strbuf sb = STRBUF_INIT;
+ int fd;
+
+ if (write_shallow_commits(&sb, 0)) {
+ struct strbuf path = STRBUF_INIT;
+ strbuf_addstr(&path, git_path("shallow_XXXXXX"));
+ fd = xmkstemp(path.buf);
+ if (write_in_full(fd, sb.buf, sb.len) != sb.len)
+ die_errno("failed to write to %s",
+ path.buf);
+ close(fd);
+ strbuf_release(&sb);
+ return strbuf_detach(&path, NULL);
+ }
+ /*
+ * is_repository_shallow() sees empty string as "no shallow
+ * file".
+ */
+ return xstrdup("");
+}
+
void setup_alternate_shallow(struct lock_file *shallow_lock,
const char **alternate_shallow_file)
{

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