merge(3p/git): Merge git subtree at v2.29.2 r/1890

This also bumps the stable nixpkgs to 20.09 as of 2020-11-21, because
there is some breakage in the git build related to the netrc
credentials helper which someone has taken care of in nixpkgs.

The stable channel is not used for anything other than git, so this
should be fine.

Change-Id: I3575a19dab09e1e9556cf8231d717de9890484fb

1 files changed, 15 insertions, 1 deletions

diff --git a/third_party/git/pkt-line.h b/third_party/git/pkt-line.h
index 5c62015db4df..8c90daa59ef0 100644
--- a/third_party/git/pkt-line.h
+++ b/third_party/git/pkt-line.h
@@ -22,6 +22,7 @@
  */
 void packet_flush(int fd);
 void packet_delim(int fd);
+void packet_response_end(int fd);
 void packet_write_fmt(int fd, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
 void packet_buf_flush(struct strbuf *buf);
 void packet_buf_delim(struct strbuf *buf);
@@ -75,9 +76,18 @@ int packet_read(int fd, char **src_buffer, size_t *src_len, char
 		*buffer, unsigned size, int options);
 
 /*
+ * Convert a four hex digit packet line length header into its numeric
+ * representation.
+ *
+ * If lenbuf_hex contains non-hex characters, return -1. Otherwise, return the
+ * numeric value of the length header.
+ */
+int packet_length(const char lenbuf_hex[4]);
+
+/*
  * Read a packetized line into a buffer like the 'packet_read()' function but
  * returns an 'enum packet_read_status' which indicates the status of the read.
- * The number of bytes read will be assigined to *pktlen if the status of the
+ * The number of bytes read will be assigned to *pktlen if the status of the
  * read was 'PACKET_READ_NORMAL'.
  */
 enum packet_read_status {
@@ -85,6 +95,7 @@ enum packet_read_status {
 	PACKET_READ_NORMAL,
 	PACKET_READ_FLUSH,
 	PACKET_READ_DELIM,
+	PACKET_READ_RESPONSE_END,
 };
 enum packet_read_status packet_read_with_status(int fd, char **src_buffer,
 						size_t *src_len, char *buffer,
@@ -166,6 +177,9 @@ struct packet_reader {
 
 	unsigned use_sideband : 1;
 	const char *me;
+
+	/* hash algorithm in use */
+	const struct git_hash_algo *hash_algo;
 };
 
 /*