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From: "brian m. carlson" <sandals@crustytoothpaste.net>
To: <git@vger.kernel.org>
Subject: [RFC PATCH 03/22] repository: require a build flag to use SHA-256
Date: Mon, 13 Jan 2020 12:47:10 +0000
Message-ID: <20200113124729.3684846-4-sandals@crustytoothpaste.net> (raw)
In-Reply-To: <20200113124729.3684846-1-sandals@crustytoothpaste.net>

At this point, SHA-256 support is experimental and some behavior may
change. To avoid surprising unsuspecting users, require a build flag,
ENABLE_SHA256, to allow use of a non-SHA-1 algorithm. Enable this flag
by default when the DEVELOPER make flag is set so that contributors can
test this case adequately.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 config.mak.dev | 2 ++
 repository.c   | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/config.mak.dev b/config.mak.dev
index bf1f3fcdee..2e19435915 100644
--- a/config.mak.dev
+++ b/config.mak.dev
@@ -17,6 +17,8 @@ DEVELOPER_CFLAGS += -Wstrict-prototypes
 DEVELOPER_CFLAGS += -Wunused
 DEVELOPER_CFLAGS += -Wvla
 
+DEVELOPER_CFLAGS += -DENABLE_SHA256
+
 ifndef COMPILER_FEATURES
 COMPILER_FEATURES := $(shell ./detect-compiler $(CC))
 endif
diff --git a/repository.c b/repository.c
index a4174ddb06..6f7f6f002b 100644
--- a/repository.c
+++ b/repository.c
@@ -89,6 +89,10 @@ void repo_set_gitdir(struct repository *repo,
 void repo_set_hash_algo(struct repository *repo, int hash_algo)
 {
 	repo->hash_algo = &hash_algos[hash_algo];
+#ifndef ENABLE_SHA256
+	if (hash_algo != GIT_HASH_SHA1)
+		die(_("The hash algorithm %s is not supported in this build."), repo->hash_algo->name);
+#endif
 }
 
 /*

  parent reply index

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-13 12:47 [RFC PATCH 00/22] SHA-256 stage 4 implementation, part 1/3 brian m. carlson
2020-01-13 12:47 ` [RFC PATCH 01/22] hex: introduce parsing variants taking hash algorithms brian m. carlson
2020-01-13 12:47 ` [RFC PATCH 02/22] hex: add functions to parse hex object IDs in any algorithm brian m. carlson
2020-01-15 21:40   ` Junio C Hamano
2020-01-16  0:22     ` brian m. carlson
2020-01-13 12:47 ` brian m. carlson [this message]
2020-01-13 12:47 ` [RFC PATCH 04/22] t: use hash-specific lookup tables to define test constants brian m. carlson
2020-01-13 12:47 ` [RFC PATCH 05/22] t6300: abstract away SHA-1-specific constants brian m. carlson
2020-01-13 12:47 ` [RFC PATCH 06/22] t6300: make hash algorithm independent brian m. carlson
2020-01-13 12:47 ` [RFC PATCH 07/22] t/helper/test-dump-split-index: initialize git repository brian m. carlson
2020-01-13 12:47 ` [RFC PATCH 08/22] t/helper: initialize repository if necessary brian m. carlson
2020-01-13 12:47 ` [RFC PATCH 09/22] t/helper: make repository tests hash independent brian m. carlson
2020-01-13 12:47 ` [RFC PATCH 10/22] setup: allow check_repository_format to read repository format brian m. carlson
2020-01-13 12:47 ` [RFC PATCH 11/22] builtin/init-db: allow specifying hash algorithm on command line brian m. carlson
2020-01-13 12:47 ` [RFC PATCH 12/22] builtin/init-db: add environment variable for new repo hash brian m. carlson
2020-01-13 12:47 ` [RFC PATCH 13/22] init-db: move writing repo version into a function brian m. carlson
2020-01-13 12:47 ` [RFC PATCH 14/22] worktree: allow repository version 1 brian m. carlson
2020-01-13 12:47 ` [RFC PATCH 15/22] commit: use expected signature header for SHA-256 brian m. carlson
2020-01-13 12:47 ` [RFC PATCH 16/22] gpg-interface: improve interface for parsing tags brian m. carlson
2020-01-13 12:47 ` [RFC PATCH 17/22] tag: store SHA-256 signatures in a header brian m. carlson
2020-01-13 12:47 ` [RFC PATCH 18/22] fast-import: permit reading multiple marks files brian m. carlson
2020-01-13 12:47 ` [RFC PATCH 19/22] fast-import: add helper function for inserting mark object entries brian m. carlson
2020-01-13 12:47 ` [RFC PATCH 20/22] fast-import: make find_marks work on any mark set brian m. carlson
2020-01-13 12:47 ` [RFC PATCH 21/22] fast-import: add a generic function to iterate over marks brian m. carlson
2020-01-13 12:47 ` [RFC PATCH 22/22] fast-import: add options for rewriting submodules brian m. carlson

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