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Re: [PATCH 1/1] rebase: really just passthru the `git am` options




Hi Johannes

Thanks for looking at this. Unfortunately using OPT_PASSTHRU_ARGV seems to break the error reporting

Running
  bin/wrappers/git rebase --onto @^^^^ @^^ -Cbad

Gives
  git encountered an error while preparing the patches to replay
  these revisions:


67f673aa4a580b9e407b1ca505abf1f50510ec47...7c3e01a708856885e60bf4051586970e65dd326c

  As a result, git cannot rebase them.

If I do

  bin/wrappers/git rebase @^^ -Cbad

I get no error, it just tells me that it does not need to rebase (which is true)

Best Wishes

Phillip


On 13/11/2018 12:38, Johannes Schindelin via GitGitGadget wrote:
From: Johannes Schindelin <johannes.schindelin@xxxxxx>

Currently, we parse the options intended for `git am` as if we wanted to
handle them in `git rebase`, and then reconstruct them painstakingly to
define the `git_am_opt` variable.

However, there is a much better way (that I was unaware of, at the time
when I mentored Pratik to implement these options): OPT_PASSTHRU_ARGV.
It is intended for exactly this use case, where command-line options
want to be parsed into a separate `argv_array`.

Let's use this feature.

Incidentally, this also allows us to address a bug discovered by Phillip
Wood, where the built-in rebase failed to understand that the `-C`
option takes an optional argument.

Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
  builtin/rebase.c | 98 +++++++++++++++++-------------------------------
  1 file changed, 35 insertions(+), 63 deletions(-)

diff --git a/builtin/rebase.c b/builtin/rebase.c
index 0ee06aa363..96ffa80b71 100644
--- a/builtin/rebase.c
+++ b/builtin/rebase.c
@@ -87,7 +87,7 @@ struct rebase_options {
  		REBASE_FORCE = 1<<3,
  		REBASE_INTERACTIVE_EXPLICIT = 1<<4,
  	} flags;
-	struct strbuf git_am_opt;
+	struct argv_array git_am_opts;
  	const char *action;
  	int signoff;
  	int allow_rerere_autoupdate;
@@ -339,7 +339,7 @@ N_("Resolve all conflicts manually, mark them as resolved with\n"
  static int run_specific_rebase(struct rebase_options *opts)
  {
  	const char *argv[] = { NULL, NULL };
-	struct strbuf script_snippet = STRBUF_INIT;
+	struct strbuf script_snippet = STRBUF_INIT, buf = STRBUF_INIT;
  	int status;
  	const char *backend, *backend_func;
@@ -433,7 +433,9 @@ static int run_specific_rebase(struct rebase_options *opts)
  		oid_to_hex(&opts->restrict_revision->object.oid) : NULL);
  	add_var(&script_snippet, "GIT_QUIET",
  		opts->flags & REBASE_NO_QUIET ? "" : "t");
-	add_var(&script_snippet, "git_am_opt", opts->git_am_opt.buf);
+	sq_quote_argv_pretty(&buf, opts->git_am_opts.argv);
+	add_var(&script_snippet, "git_am_opt", buf.buf);
+	strbuf_release(&buf);
  	add_var(&script_snippet, "verbose",
  		opts->flags & REBASE_VERBOSE ? "t" : "");
  	add_var(&script_snippet, "diffstat",
@@ -756,7 +758,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
  	struct rebase_options options = {
  		.type = REBASE_UNSPECIFIED,
  		.flags = REBASE_NO_QUIET,
-		.git_am_opt = STRBUF_INIT,
+		.git_am_opts = ARGV_ARRAY_INIT,
  		.allow_rerere_autoupdate  = -1,
  		.allow_empty_message = 1,
  		.git_format_patch_opt = STRBUF_INIT,
@@ -777,12 +779,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
  		ACTION_EDIT_TODO,
  		ACTION_SHOW_CURRENT_PATCH,
  	} action = NO_ACTION;
-	int committer_date_is_author_date = 0;
-	int ignore_date = 0;
-	int ignore_whitespace = 0;
  	const char *gpg_sign = NULL;
-	int opt_c = -1;
-	struct string_list whitespace = STRING_LIST_INIT_NODUP;
  	struct string_list exec = STRING_LIST_INIT_NODUP;
  	const char *rebase_merges = NULL;
  	int fork_point = -1;
@@ -804,15 +801,20 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
  		{OPTION_NEGBIT, 'n', "no-stat", &options.flags, NULL,
  			N_("do not show diffstat of what changed upstream"),
  			PARSE_OPT_NOARG, NULL, REBASE_DIFFSTAT },
-		OPT_BOOL(0, "ignore-whitespace", &ignore_whitespace,
-			 N_("passed to 'git apply'")),
  		OPT_BOOL(0, "signoff", &options.signoff,
  			 N_("add a Signed-off-by: line to each commit")),
-		OPT_BOOL(0, "committer-date-is-author-date",
-			 &committer_date_is_author_date,
-			 N_("passed to 'git am'")),
-		OPT_BOOL(0, "ignore-date", &ignore_date,
-			 N_("passed to 'git am'")),
+		OPT_PASSTHRU_ARGV(0, "ignore-whitespace", &options.git_am_opts,
+				  NULL, N_("passed to 'git am'"),
+				  PARSE_OPT_NOARG),
+		OPT_PASSTHRU_ARGV(0, "committer-date-is-author-date",
+				  &options.git_am_opts, NULL,
+				  N_("passed to 'git am'"), PARSE_OPT_NOARG),
+		OPT_PASSTHRU_ARGV(0, "ignore-date", &options.git_am_opts, NULL,
+				  N_("passed to 'git am'"), PARSE_OPT_NOARG),
+		OPT_PASSTHRU_ARGV('C', NULL, &options.git_am_opts, N_("n"),
+				  N_("passed to 'git apply'"), 0),
+		OPT_PASSTHRU_ARGV(0, "whitespace", &options.git_am_opts,
+				  N_("action"), N_("passed to 'git apply'"), 0),
  		OPT_BIT('f', "force-rebase", &options.flags,
  			N_("cherry-pick all commits, even if unchanged"),
  			REBASE_FORCE),
@@ -856,10 +858,6 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
  		{ OPTION_STRING, 'S', "gpg-sign", &gpg_sign, N_("key-id"),
  			N_("GPG-sign commits"),
  			PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
-		OPT_STRING_LIST(0, "whitespace", &whitespace,
-				N_("whitespace"), N_("passed to 'git apply'")),
-		OPT_SET_INT('C', NULL, &opt_c, N_("passed to 'git apply'"),
-			    REBASE_AM),
  		OPT_BOOL(0, "autostash", &options.autostash,
  			 N_("automatically stash/stash pop before and after")),
  		OPT_STRING_LIST('x', "exec", &exec, N_("exec"),
@@ -884,6 +882,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
  			 N_("rebase all reachable commits up to the root(s)")),
  		OPT_END(),
  	};
+	int i;
/*
  	 * NEEDSWORK: Once the builtin rebase has been tested enough
@@ -1064,22 +1063,17 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
  		    state_dir_base, cmd_live_rebase, buf.buf);
  	}
- if (!(options.flags & REBASE_NO_QUIET))
-		strbuf_addstr(&options.git_am_opt, " -q");
-
-	if (committer_date_is_author_date) {
-		strbuf_addstr(&options.git_am_opt,
-			      " --committer-date-is-author-date");
-		options.flags |= REBASE_FORCE;
+	for (i = 0; i < options.git_am_opts.argc; i++) {
+		const char *option = options.git_am_opts.argv[i];
+		if (!strcmp(option, "--committer-date-is-author-date") ||
+		    !strcmp(option, "--ignore-date") ||
+		    !strcmp(option, "--whitespace=fix") ||
+		    !strcmp(option, "--whitespace=strip"))
+			options.flags |= REBASE_FORCE;
  	}
- if (ignore_whitespace)
-		strbuf_addstr(&options.git_am_opt, " --ignore-whitespace");
-
-	if (ignore_date) {
-		strbuf_addstr(&options.git_am_opt, " --ignore-date");
-		options.flags |= REBASE_FORCE;
-	}
+	if (!(options.flags & REBASE_NO_QUIET))
+		argv_array_push(&options.git_am_opts, "-q");
if (options.keep_empty)
  		imply_interactive(&options, "--keep-empty");
@@ -1089,23 +1083,6 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
  		options.gpg_sign_opt = xstrfmt("-S%s", gpg_sign);
  	}
- if (opt_c >= 0)
-		strbuf_addf(&options.git_am_opt, " -C%d", opt_c);
-
-	if (whitespace.nr) {
-		int i;
-
-		for (i = 0; i < whitespace.nr; i++) {
-			const char *item = whitespace.items[i].string;
-
-			strbuf_addf(&options.git_am_opt, " --whitespace=%s",
-				    item);
-
-			if ((!strcmp(item, "fix")) || (!strcmp(item, "strip")))
-				options.flags |= REBASE_FORCE;
-		}
-	}
-
  	if (exec.nr) {
  		int i;
@@ -1181,23 +1158,18 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
  		break;
  	}
- if (options.git_am_opt.len) {
-		const char *p;
-
+	if (options.git_am_opts.argc) {
  		/* all am options except -q are compatible only with --am */
-		strbuf_reset(&buf);
-		strbuf_addbuf(&buf, &options.git_am_opt);
-		strbuf_addch(&buf, ' ');
-		while ((p = strstr(buf.buf, " -q ")))
-			strbuf_splice(&buf, p - buf.buf, 4, " ", 1);
-		strbuf_trim(&buf);
+		for (i = options.git_am_opts.argc - 1; i >= 0; i--)
+			if (strcmp(options.git_am_opts.argv[i], "-q"))
+				break;
- if (is_interactive(&options) && buf.len)
+		if (is_interactive(&options) && i >= 0)
  			die(_("error: cannot combine interactive options "
  			      "(--interactive, --exec, --rebase-merges, "
  			      "--preserve-merges, --keep-empty, --root + "
  			      "--onto) with am options (%s)"), buf.buf);
-		if (options.type == REBASE_MERGE && buf.len)
+		if (options.type == REBASE_MERGE && i >= 0)
  			die(_("error: cannot combine merge options (--merge, "
  			      "--strategy, --strategy-option) with am options "
  			      "(%s)"), buf.buf);
@@ -1207,7 +1179,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
  		if (options.type == REBASE_PRESERVE_MERGES)
  			die("cannot combine '--signoff' with "
  			    "'--preserve-merges'");
-		strbuf_addstr(&options.git_am_opt, " --signoff");
+		argv_array_push(&options.git_am_opts, "--signoff");
  		options.flags |= REBASE_FORCE;
  	}