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, 35 insertions, 32 deletions

diff --git a/third_party/git/parse-options.c b/third_party/git/parse-options.c
index 87b26a1d92..f0507432ee 100644
--- a/third_party/git/parse-options.c
+++ b/third_party/git/parse-options.c
@@ -61,7 +61,7 @@ static enum parse_opt_result opt_command_mode_error(
 	 */
 	for (that = all_opts; that->type != OPTION_END; that++) {
 		if (that == opt ||
-		    that->type != OPTION_CMDMODE ||
+		    !(that->flags & PARSE_OPT_CMDMODE) ||
 		    that->value != opt->value ||
 		    that->defval != *(int *)opt->value)
 			continue;
@@ -95,6 +95,14 @@ static enum parse_opt_result get_value(struct parse_opt_ctx_t *p,
 	if (!(flags & OPT_SHORT) && p->opt && (opt->flags & PARSE_OPT_NOARG))
 		return error(_("%s takes no value"), optname(opt, flags));
 
+	/*
+	 * Giving the same mode option twice, although unnecessary,
+	 * is not a grave error, so let it pass.
+	 */
+	if ((opt->flags & PARSE_OPT_CMDMODE) &&
+	    *(int *)opt->value && *(int *)opt->value != opt->defval)
+		return opt_command_mode_error(opt, all_opts, flags);
+
 	switch (opt->type) {
 	case OPTION_LOWLEVEL_CALLBACK:
 		return opt->ll_callback(p, opt, NULL, unset);
@@ -130,16 +138,6 @@ static enum parse_opt_result get_value(struct parse_opt_ctx_t *p,
 		*(int *)opt->value = unset ? 0 : opt->defval;
 		return 0;
 
-	case OPTION_CMDMODE:
-		/*
-		 * Giving the same mode option twice, although is unnecessary,
-		 * is not a grave error, so let it pass.
-		 */
-		if (*(int *)opt->value && *(int *)opt->value != opt->defval)
-			return opt_command_mode_error(opt, all_opts, flags);
-		*(int *)opt->value = opt->defval;
-		return 0;
-
 	case OPTION_STRING:
 		if (unset)
 			*(const char **)opt->value = NULL;
@@ -357,8 +355,7 @@ is_abbreviated:
 			}
 			/* negated? */
 			if (!starts_with(arg, "no-")) {
-				if (starts_with(long_name, "no-")) {
-					long_name += 3;
+				if (skip_prefix(long_name, "no-", &long_name)) {
 					opt_flags |= OPT_UNSET;
 					goto again;
 				}
@@ -420,7 +417,7 @@ static void check_typos(const char *arg, const struct option *options)
 		return;
 
 	if (starts_with(arg, "no-")) {
-		error(_("did you mean `--%s` (with two dashes ?)"), arg);
+		error(_("did you mean `--%s` (with two dashes)?"), arg);
 		exit(129);
 	}
 
@@ -428,7 +425,7 @@ static void check_typos(const char *arg, const struct option *options)
 		if (!options->long_name)
 			continue;
 		if (starts_with(options->long_name, arg)) {
-			error(_("did you mean `--%s` (with two dashes ?)"), arg);
+			error(_("did you mean `--%s` (with two dashes)?"), arg);
 			exit(129);
 		}
 	}
@@ -528,7 +525,8 @@ void parse_options_start(struct parse_opt_ctx_t *ctx,
 	parse_options_start_1(ctx, argc, argv, prefix, options, flags);
 }
 
-static void show_negated_gitcomp(const struct option *opts, int nr_noopts)
+static void show_negated_gitcomp(const struct option *opts, int show_all,
+				 int nr_noopts)
 {
 	int printed_dashdash = 0;
 
@@ -538,7 +536,8 @@ static void show_negated_gitcomp(const struct option *opts, int nr_noopts)
 
 		if (!opts->long_name)
 			continue;
-		if (opts->flags & (PARSE_OPT_HIDDEN | PARSE_OPT_NOCOMPLETE))
+		if (!show_all &&
+			(opts->flags & (PARSE_OPT_HIDDEN | PARSE_OPT_NOCOMPLETE)))
 			continue;
 		if (opts->flags & PARSE_OPT_NONEG)
 			continue;
@@ -575,7 +574,7 @@ static void show_negated_gitcomp(const struct option *opts, int nr_noopts)
 	}
 }
 
-static int show_gitcomp(const struct option *opts)
+static int show_gitcomp(const struct option *opts, int show_all)
 {
 	const struct option *original_opts = opts;
 	int nr_noopts = 0;
@@ -585,7 +584,8 @@ static int show_gitcomp(const struct option *opts)
 
 		if (!opts->long_name)
 			continue;
-		if (opts->flags & (PARSE_OPT_HIDDEN | PARSE_OPT_NOCOMPLETE))
+		if (!show_all &&
+			(opts->flags & (PARSE_OPT_HIDDEN | PARSE_OPT_NOCOMPLETE)))
 			continue;
 
 		switch (opts->type) {
@@ -613,8 +613,8 @@ static int show_gitcomp(const struct option *opts)
 			nr_noopts++;
 		printf(" --%s%s", opts->long_name, suffix);
 	}
-	show_negated_gitcomp(original_opts, -1);
-	show_negated_gitcomp(original_opts, nr_noopts);
+	show_negated_gitcomp(original_opts, show_all, -1);
+	show_negated_gitcomp(original_opts, show_all, nr_noopts);
 	fputc('\n', stdout);
 	return PARSE_OPT_COMPLETE;
 }
@@ -623,7 +623,7 @@ static int show_gitcomp(const struct option *opts)
  * Scan and may produce a new option[] array, which should be used
  * instead of the original 'options'.
  *
- * Right now this is only used to preprocess and substitue
+ * Right now this is only used to preprocess and substitute
  * OPTION_ALIAS.
  */
 static struct option *preprocess_options(struct parse_opt_ctx_t *ctx,
@@ -651,6 +651,7 @@ static struct option *preprocess_options(struct parse_opt_ctx_t *ctx,
 		int short_name;
 		const char *long_name;
 		const char *source;
+		struct strbuf help = STRBUF_INIT;
 		int j;
 
 		if (newopt[i].type != OPTION_ALIAS)
@@ -662,6 +663,7 @@ static struct option *preprocess_options(struct parse_opt_ctx_t *ctx,
 
 		if (!long_name)
 			BUG("An alias must have long option name");
+		strbuf_addf(&help, _("alias of --%s"), source);
 
 		for (j = 0; j < nr; j++) {
 			const char *name = options[j].long_name;
@@ -672,15 +674,10 @@ static struct option *preprocess_options(struct parse_opt_ctx_t *ctx,
 			if (options[j].type == OPTION_ALIAS)
 				BUG("No please. Nested aliases are not supported.");
 
-			/*
-			 * NEEDSWORK: this is a bit inconsistent because
-			 * usage_with_options() on the original options[] will print
-			 * help string as "alias of %s" but "git cmd -h" will
-			 * print the original help string.
-			 */
 			memcpy(newopt + i, options + j, sizeof(*newopt));
 			newopt[i].short_name = short_name;
 			newopt[i].long_name = long_name;
+			newopt[i].help = strbuf_detach(&help, NULL);
 			break;
 		}
 
@@ -729,9 +726,14 @@ int parse_options_step(struct parse_opt_ctx_t *ctx,
 		if (internal_help && ctx->total == 1 && !strcmp(arg + 1, "h"))
 			goto show_usage;
 
-		/* lone --git-completion-helper is asked by git-completion.bash */
-		if (ctx->total == 1 && !strcmp(arg + 1, "-git-completion-helper"))
-			return show_gitcomp(options);
+		/*
+		 * lone --git-completion-helper and --git-completion-helper-all
+		 * are asked by git-completion.bash
+		 */
+		if (ctx->total == 1 && !strcmp(arg, "--git-completion-helper"))
+			return show_gitcomp(options, 0);
+		if (ctx->total == 1 && !strcmp(arg, "--git-completion-helper-all"))
+			return show_gitcomp(options, 1);
 
 		if (arg[1] != '-') {
 			ctx->opt = arg + 1;
@@ -780,7 +782,8 @@ int parse_options_step(struct parse_opt_ctx_t *ctx,
 			continue;
 		}
 
-		if (!arg[2]) { /* "--" */
+		if (!arg[2] /* "--" */ ||
+		    !strcmp(arg + 2, "end-of-options")) {
 			if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
 				ctx->argc--;
 				ctx->argv++;