git/list[1] front-page[2] threads[3] people[4] search[5] about
 

[PATCH v3 06/21] read_packed_refs(): only check for a header at the top of the file

From
Michael Haggerty <mhagger@alum.mit.edu>
Date
Sep 25, 2017, 08:00 UTC
Message-ID
<c8e8df259b99e26a49a7bc03c4dc657c2b36d61d.1506325610.git.mhagger@alum.mit.edu>
In-Reply-To
<cover.1506325610.git.mhagger@alum.mit.edu>

This tightens up the parsing a bit; previously, stray header-looking lines would have been processed.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
---
 refs/packed-backend.c | 35 ++++++++++++++++++++++++-----------
 1 file changed, 24 insertions(+), 11 deletions(-)
diff --git a/refs/packed-backend.c b/refs/packed-backend.c
index 154abbd83a..141f02b9c8 100644
--- a/refs/packed-backend.c
+++ b/refs/packed-backend.c
@@ -255,11 +255,34 @@ static struct packed_ref_cache *read_packed_refs(struct packed_ref_store *refs)
 	pos = buf;
 	eof = buf + size;
 
+	/* If the file has a header line, process it: */
+	if (pos < eof && *pos == '#') {
+		const char *traits;
+
+		eol = memchr(pos, '\n', eof - pos);
+		if (!eol)
+			die_unterminated_line(refs->path, pos, eof - pos);
+
+		strbuf_add(&line, pos, eol + 1 - pos);
+
+		if (!skip_prefix(line.buf, "# pack-refs with:", &traits))
+			die_invalid_line(refs->path, pos, eof - pos);
+
+		if (strstr(traits, " fully-peeled "))
+			peeled = PEELED_FULLY;
+		else if (strstr(traits, " peeled "))
+			peeled = PEELED_TAGS;
+		/* perhaps other traits later as well */
+
+		/* The "+ 1" is for the LF character. */
+		pos = eol + 1;
+		strbuf_reset(&line);
+	}
+
 	dir = get_ref_dir(packed_refs->cache->root);
 	while (pos < eof) {
 		struct object_id oid;
 		const char *refname;
-		const char *traits;
 
 		eol = memchr(pos, '\n', eof - pos);
 		if (!eol)
@@ -267,15 +290,6 @@ static struct packed_ref_cache *read_packed_refs(struct packed_ref_store *refs)
 
 		strbuf_add(&line, pos, eol + 1 - pos);
 
-		if (skip_prefix(line.buf, "# pack-refs with:", &traits)) {
-			if (strstr(traits, " fully-peeled "))
-				peeled = PEELED_FULLY;
-			else if (strstr(traits, " peeled "))
-				peeled = PEELED_TAGS;
-			/* perhaps other traits later as well */
-			goto next_line;
-		}
-
 		refname = parse_ref_line(&line, &oid);
 		if (refname) {
 			int flag = REF_ISPACKED;
@@ -307,7 +321,6 @@ static struct packed_ref_cache *read_packed_refs(struct packed_ref_store *refs)
 			die_invalid_line(refs->path, line.buf, line.len);
 		}
 
-	next_line:
 		/* The "+ 1" is for the LF character. */
 		pos = eol + 1;
 		strbuf_reset(&line);

-- 
2.14.1
Previous: Michael HaggertyNext: Michael Haggerty
Message 7 of 24 in “Read `packed-refs` using mmap()”
  1. 00/21 Read `packed-refs` using mmap()Michael Haggerty, Sep 25, 2017
  2. 01/21 ref_iterator: keep track of whether the iterator output is orderedMichael Haggerty, Sep 25, 2017
  3. 02/21 prefix_ref_iterator: break when we leave the prefixMichael Haggerty, Sep 25, 2017
  4. 03/21 packed_ref_cache: add a backlink to the associated `packed_ref_store`Michael Haggerty, Sep 25, 2017
  5. 04/21 die_unterminated_line(), die_invalid_line(): new functionsMichael Haggerty, Sep 25, 2017
  6. 05/21 read_packed_refs(): use mmap to read the `packed-refs` fileMichael Haggerty, Sep 25, 2017
  7. 06/21 read_packed_refs(): only check for a header at the top of the fileMichael Haggerty, Sep 25, 2017
  8. 07/21 read_packed_refs(): make parsing of the header line more robustMichael Haggerty, Sep 25, 2017
  9. 09/21 packed_ref_cache: remember the file-wide peeling stateMichael Haggerty, Sep 25, 2017
  10. 08/21 read_packed_refs(): read references with minimal copyingMichael Haggerty, Sep 25, 2017
  11. 10/21 mmapped_ref_iterator: add iterator over a packed-refs fileMichael Haggerty, Sep 25, 2017
  12. 12/21 packed-backend.c: reorder some definitionsMichael Haggerty, Sep 25, 2017
  13. 13/21 packed_ref_cache: keep the `packed-refs` file mmapped if possibleMichael Haggerty, Sep 25, 2017
  14. 14/21 read_packed_refs(): ensure that references are ordered when readMichael Haggerty, Sep 25, 2017
  15. 11/21 mmapped_ref_iterator_advance(): no peeled value for broken refsMichael Haggerty, Sep 25, 2017
  16. 15/21 packed_ref_iterator_begin(): iterate using `mmapped_ref_iterator`Michael Haggerty, Sep 25, 2017
  17. 16/21 packed_read_raw_ref(): read the reference from the mmapped bufferMichael Haggerty, Sep 25, 2017
  18. 17/21 ref_store: implement `refs_peel_ref()` genericallyMichael Haggerty, Sep 25, 2017
  19. 18/21 packed_ref_store: get rid of the `ref_cache` entirelyMichael Haggerty, Sep 25, 2017
  20. 20/21 mmapped_ref_iterator: inline into `packed_ref_iterator`Michael Haggerty, Sep 25, 2017
  21. 19/21 ref_cache: remove support for storing peeled valuesMichael Haggerty, Sep 25, 2017
  22. 21/21 packed-backend.c: rename a bunch of things and update commentsMichael Haggerty, Sep 25, 2017
  23. Jeff KingSep 25, 2017
  24. Junio C HamanoSep 29, 2017

Read the whole thread, see it on lore, or plain text.

$ cat FOOTERMessages come from the public archive at lore.kernel.org/git, fetched every hour. The front page is chosen and written each morning by an AI editor and can be wrong; the threads themselves are the record. About and API. For agents: an MCP server at https://gitlist.dev/mcp, and any thread, story or person page as Markdown by adding .md to its URL (or sending Accept: text/markdown). Details in /llms.txt.