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

6 files changed, 11 insertions, 6 deletions

diff --git a/third_party/git/compat/regex/regcomp.c b/third_party/git/compat/regex/regcomp.c
index c0d838834a..d1bc09e49b 100644
--- a/third_party/git/compat/regex/regcomp.c
+++ b/third_party/git/compat/regex/regcomp.c
@@ -3462,7 +3462,7 @@ build_equiv_class (bitset_t sbcset, const unsigned char *name)
 	/* This isn't a valid character.  */
 	return REG_ECOLLATE;
 
-      /* Build single byte matcing table for this equivalence class.  */
+      /* Build single byte matching table for this equivalence class.  */
       char_buf[1] = (unsigned char) '\0';
       len = weights[idx1 & 0xffffff];
       for (ch = 0; ch < SBC_MAX; ++ch)
diff --git a/third_party/git/compat/regex/regex.c b/third_party/git/compat/regex/regex.c
index f3e03a9eab..e6f4a5d177 100644
--- a/third_party/git/compat/regex/regex.c
+++ b/third_party/git/compat/regex/regex.c
@@ -60,6 +60,7 @@
    #undefs RE_DUP_MAX and sets it to the right value.  */
 #include <limits.h>
 #include <stdint.h>
+#include <stdlib.h>
 
 #ifdef GAWK
 #undef alloca
diff --git a/third_party/git/compat/regex/regex.h b/third_party/git/compat/regex/regex.h
index 4d81358a83..2d3412860d 100644
--- a/third_party/git/compat/regex/regex.h
+++ b/third_party/git/compat/regex/regex.h
@@ -41,6 +41,11 @@
 extern "C" {
 #endif
 
+#define regcomp git_regcomp
+#define regexec git_regexec
+#define regerror git_regerror
+#define regfree git_regfree
+
 /* The following two types have to be signed and unsigned integer type
    wide enough to hold a value of a pointer.  For most ANSI compilers
    ptrdiff_t and size_t should be likely OK.  Still size of these two
@@ -322,7 +327,7 @@ typedef enum
   /* POSIX regcomp return error codes.  (In the order listed in the
      standard.)  */
   REG_BADPAT,		/* Invalid pattern.  */
-  REG_ECOLLATE,		/* Inalid collating element.  */
+  REG_ECOLLATE,		/* Invalid collating element.  */
   REG_ECTYPE,		/* Invalid character class name.  */
   REG_EESCAPE,		/* Trailing backslash.  */
   REG_ESUBREG,		/* Invalid back reference.  */
diff --git a/third_party/git/compat/regex/regex_internal.c b/third_party/git/compat/regex/regex_internal.c
index 59bf151336..ec51cf3446 100644
--- a/third_party/git/compat/regex/regex_internal.c
+++ b/third_party/git/compat/regex/regex_internal.c
@@ -1616,7 +1616,7 @@ free_state (re_dfastate_t *state)
   re_free (state);
 }
 
-/* Create the new state which is independ of contexts.
+/* Create the new state which is independent of contexts.
    Return the new state if succeeded, otherwise return NULL.  */
 
 static re_dfastate_t *
diff --git a/third_party/git/compat/regex/regex_internal.h b/third_party/git/compat/regex/regex_internal.h
index 3ee8aae59d..0bad8b841e 100644
--- a/third_party/git/compat/regex/regex_internal.h
+++ b/third_party/git/compat/regex/regex_internal.h
@@ -23,7 +23,6 @@
 #include <assert.h>
 #include <ctype.h>
 #include <stdio.h>
-#include <stdlib.h>
 #include <string.h>
 
 #if defined HAVE_LANGINFO_H || defined HAVE_LANGINFO_CODESET || defined _LIBC
diff --git a/third_party/git/compat/regex/regexec.c b/third_party/git/compat/regex/regexec.c
index 1b5d89fd5e..49358ae475 100644
--- a/third_party/git/compat/regex/regexec.c
+++ b/third_party/git/compat/regex/regexec.c
@@ -2420,7 +2420,7 @@ find_recover_state (reg_errcode_t *err, re_match_context_t *mctx)
 /* From the node set CUR_NODES, pick up the nodes whose types are
    OP_OPEN_SUBEXP and which have corresponding back references in the regular
    expression. And register them to use them later for evaluating the
-   correspoding back references.  */
+   corresponding back references.  */
 
 static reg_errcode_t
 internal_function
@@ -3347,7 +3347,7 @@ build_trtable (const re_dfa_t *dfa, re_dfastate_t *state)
   dests_node = dests_alloc->dests_node;
   dests_ch = dests_alloc->dests_ch;
 
-  /* Initialize transiton table.  */
+  /* Initialize transition table.  */
   state->word_trtable = state->trtable = NULL;
 
   /* At first, group all nodes belonging to `state' into several