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, 46 insertions, 1 deletions

diff --git a/third_party/git/strbuf.h b/third_party/git/strbuf.h
index f62278a0be59..223ee2094af8 100644
--- a/third_party/git/strbuf.h
+++ b/third_party/git/strbuf.h
@@ -245,6 +245,18 @@ void strbuf_addchars(struct strbuf *sb, int c, size_t n);
 void strbuf_insert(struct strbuf *sb, size_t pos, const void *, size_t);
 
 /**
+ * Insert a NUL-terminated string to the given position of the buffer.
+ * The remaining contents will be shifted, not overwritten.  It's an
+ * inline function to allow the compiler to resolve strlen() calls on
+ * constants at compile time.
+ */
+static inline void strbuf_insertstr(struct strbuf *sb, size_t pos,
+				    const char *s)
+{
+	strbuf_insert(sb, pos, s, strlen(s));
+}
+
+/**
  * Insert data to the given position of the buffer giving a printf format
  * string. The contents will be shifted, not overwritten.
  */
@@ -366,6 +378,17 @@ size_t strbuf_expand_dict_cb(struct strbuf *sb,
  */
 void strbuf_addbuf_percentquote(struct strbuf *dst, const struct strbuf *src);
 
+#define STRBUF_ENCODE_SLASH 1
+
+/**
+ * Append the contents of a string to a strbuf, percent-encoding any characters
+ * that are needed to be encoded for a URL.
+ *
+ * If STRBUF_ENCODE_SLASH is set in flags, percent-encode slashes.  Otherwise,
+ * slashes are not percent-encoded.
+ */
+void strbuf_add_percentencode(struct strbuf *dst, const char *src, int flags);
+
 /**
  * Append the given byte size as a human-readable string (i.e. 12.23 KiB,
  * 3.50 MiB).
@@ -485,6 +508,12 @@ int strbuf_getline(struct strbuf *sb, FILE *file);
 int strbuf_getwholeline(struct strbuf *sb, FILE *file, int term);
 
 /**
+ * Like `strbuf_getwholeline`, but appends the line instead of
+ * resetting the buffer first.
+ */
+int strbuf_appendwholeline(struct strbuf *sb, FILE *file, int term);
+
+/**
  * Like `strbuf_getwholeline`, but operates on a file descriptor.
  * It reads one character at a time, so it is very slow.  Do not
  * use it unless you need the correct position in the file
@@ -621,6 +650,17 @@ int launch_editor(const char *path, struct strbuf *buffer,
 int launch_sequence_editor(const char *path, struct strbuf *buffer,
 			   const char *const *env);
 
+/*
+ * In contrast to `launch_editor()`, this function writes out the contents
+ * of the specified file first, then clears the `buffer`, then launches
+ * the editor and reads back in the file contents into the `buffer`.
+ * Finally, it deletes the temporary file.
+ *
+ * If `path` is relative, it refers to a file in the `.git` directory.
+ */
+int strbuf_edit_interactively(struct strbuf *buffer, const char *path,
+			      const char *const *env);
+
 void strbuf_add_lines(struct strbuf *sb,
 		      const char *prefix,
 		      const char *buf,
@@ -672,8 +712,13 @@ void strbuf_branchname(struct strbuf *sb, const char *name,
  */
 int strbuf_check_branch_ref(struct strbuf *sb, const char *name);
 
+typedef int (*char_predicate)(char ch);
+
+int is_rfc3986_unreserved(char ch);
+int is_rfc3986_reserved_or_unreserved(char ch);
+
 void strbuf_addstr_urlencode(struct strbuf *sb, const char *name,
-			     int reserved);
+			     char_predicate allow_unencoded_fn);
 
 __attribute__((format (printf,1,2)))
 int printf_ln(const char *fmt, ...);