[PATCH v3 1/6] you-still-use-that??: help deprecating commands for removal

[Junio C Hamano <gitster@pobox.com>]

A command slated for removal like "git pack-redundant" gains a
command line option "--i-still-use-this", and refuses to work when
the option is not given.  The message and the instruction upon
seeing what to do are both rather long, so before letting another
command to use the same mechanism, factor out the message+die part
into a small helper function, and use that.

The existing pack-redundant test lacked a test to make sure that we
require the --i-still-use-this option.  Add one while we are at it.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 builtin/pack-redundant.c  | 10 ++--------
 git-compat-util.h         |  2 ++
 t/t5323-pack-redundant.sh |  5 +++++
 usage.c                   | 12 ++++++++++++
 4 files changed, 21 insertions(+), 8 deletions(-)

diff --git a/builtin/pack-redundant.c b/builtin/pack-redundant.c
index 3febe732f8..6dc9e020c7 100644
--- a/builtin/pack-redundant.c
+++ b/builtin/pack-redundant.c
@@ -625,14 +625,8 @@ int cmd_pack_redundant(int argc, const char **argv, const char *prefix UNUSED, s
 			break;
 	}
 
-	if (!i_still_use_this) {
-		fputs(_("'git pack-redundant' is nominated for removal.\n"
-			"If you still use this command, please add an extra\n"
-			"option, '--i-still-use-this', on the command line\n"
-			"and let us know you still use it by sending an e-mail\n"
-			"to <git@vger.kernel.org>.  Thanks.\n"), stderr);
-		die(_("refusing to run without --i-still-use-this"));
-	}
+	if (!i_still_use_this)
+		you_still_use_that("git pack-redundant");
 
 	if (load_all_packs)
 		load_all();
diff --git a/git-compat-util.h b/git-compat-util.h
index e123288e8f..21cab99567 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -703,6 +703,8 @@ void warning_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 
 void show_usage_if_asked(int ac, const char **av, const char *err);
 
+NORETURN void you_still_use_that(const char *command_name);
+
 #ifndef NO_OPENSSL
 #ifdef APPLE_COMMON_CRYPTO
 #include "compat/apple-common-crypto.h"
diff --git a/t/t5323-pack-redundant.sh b/t/t5323-pack-redundant.sh
index 688cd9706c..f2f20cfa40 100755
--- a/t/t5323-pack-redundant.sh
+++ b/t/t5323-pack-redundant.sh
@@ -45,6 +45,11 @@ fi
 main_repo=main.git
 shared_repo=shared.git
 
+test_expect_success 'pack-redundant needs --i-still-use-this' '
+	test_must_fail git pack-redundant >message 2>&1 &&
+	test_grep "nominated for removal" message
+'
+
 git_pack_redundant='git pack-redundant --i-still-use-this'
 
 # Create commits in <repo> and assign each commit's oid to shell variables
diff --git a/usage.c b/usage.c
index 38b46bbbfe..4aaad2b553 100644
--- a/usage.c
+++ b/usage.c
@@ -372,3 +372,15 @@ void bug_fl(const char *file, int line, const char *fmt, ...)
 	trace2_cmd_error_va(fmt, ap);
 	va_end(ap);
 }
+
+NORETURN void you_still_use_that(const char *command_name)
+{
+	fprintf(stderr,
+		_("'%s' is nominated for removal.\n"
+		  "If you still use this command, please add an extra\n"
+		  "option, '--i-still-use-this', on the command line\n"
+		  "and let us know you still use it by sending an e-mail\n"
+		  "to <git@vger.kernel.org>.  Thanks.\n"),
+		command_name);
+	die(_("refusing to run without --i-still-use-this"));
+}
-- 
2.49.0-601-ga5925c3955