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Mon, 29 Apr 2024 02:34:40 -0400 (EDT) Received: by localhost (OpenSMTPD) with ESMTPSA id bed9a6bd (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Mon, 29 Apr 2024 06:34:21 +0000 (UTC) Date: Mon, 29 Apr 2024 08:34:38 +0200 From: Patrick Steinhardt To: git@vger.kernel.org Cc: Junio C Hamano , "brian m. carlson" , Justin Tobler Subject: [PATCH v3 06/13] remote-curl: fix parsing of detached SHA256 heads Message-ID: <53439067a1e94075c3f432b6c2774b1cfb11e88c.1714371422.git.ps@pks.im> References: Precedence: bulk X-Mailing-List: git@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="C3an7qiP+h5x+o4H" Content-Disposition: inline In-Reply-To: --C3an7qiP+h5x+o4H Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable The dumb HTTP transport tries to read the remote HEAD reference by downloading the "HEAD" file and then parsing it via `http_fetch_ref()`. This function will either parse the file as an object ID in case it is exactly `the_hash_algo->hexsz` long, or otherwise it will check whether the reference starts with "ref :" and parse it as a symbolic ref. This is broken when parsing detached HEADs of a remote SHA256 repository because we never update `the_hash_algo` to the discovered remote object hash. Consequently, `the_hash_algo` will always be the fallback SHA1 hash algorithm, which will cause us to fail parsing HEAD altogteher when it contains a SHA256 object ID. Fix this issue by setting up `the_hash_algo` via `repo_set_hash_algo()`. While at it, let's make the expected SHA1 fallback explicit in our code, which also addresses an upcoming issue where we are going to remove the SHA1 fallback for `the_hash_algo`. Signed-off-by: Patrick Steinhardt --- remote-curl.c | 19 ++++++++++++++++++- t/t5550-http-fetch-dumb.sh | 15 +++++++++++++++ 2 files changed, 33 insertions(+), 1 deletion(-) diff --git a/remote-curl.c b/remote-curl.c index 0b6d7815fd..004b707fdf 100644 --- a/remote-curl.c +++ b/remote-curl.c @@ -266,12 +266,23 @@ static struct ref *parse_git_refs(struct discovery *h= eads, int for_push) return list; } =20 +/* + * Try to detect the hash algorithm used by the remote repository when usi= ng + * the dumb HTTP transport. As dumb transports cannot tell us the object h= ash + * directly have to derive it from the advertised ref lengths. + */ static const struct git_hash_algo *detect_hash_algo(struct discovery *head= s) { const char *p =3D memchr(heads->buf, '\t', heads->len); int algo; + + /* + * In case the remote has no refs we have no way to reliably determine + * the object hash used by that repository. In that case we simply fall + * back to SHA1, which may or may not be correct. + */ if (!p) - return the_hash_algo; + return &hash_algos[GIT_HASH_SHA1]; =20 algo =3D hash_algo_by_length((p - heads->buf) / 2); if (algo =3D=3D GIT_HASH_UNKNOWN) @@ -295,6 +306,12 @@ static struct ref *parse_info_refs(struct discovery *h= eads) "is this a git repository?", transport_anonymize_url(url.buf)); =20 + /* + * Set the repository's hash algo to whatever we have just detected. + * This ensures that we can correctly parse the remote references. + */ + repo_set_hash_algo(the_repository, hash_algo_by_ptr(options.hash_algo)); + data =3D heads->buf; start =3D NULL; mid =3D data; diff --git a/t/t5550-http-fetch-dumb.sh b/t/t5550-http-fetch-dumb.sh index 4c3b32785d..5f16cbc58d 100755 --- a/t/t5550-http-fetch-dumb.sh +++ b/t/t5550-http-fetch-dumb.sh @@ -55,6 +55,21 @@ test_expect_success 'list refs from outside any reposito= ry' ' test_cmp expect actual ' =20 + +test_expect_success 'list detached HEAD from outside any repository' ' + git clone --mirror "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" \ + "$HTTPD_DOCUMENT_ROOT_PATH/repo-detached.git" && + git -C "$HTTPD_DOCUMENT_ROOT_PATH/repo-detached.git" \ + update-ref --no-deref HEAD refs/heads/main && + git -C "$HTTPD_DOCUMENT_ROOT_PATH/repo-detached.git" update-server-info && + cat >expect <<-EOF && + $(git rev-parse main) HEAD + $(git rev-parse main) refs/heads/main + EOF + nongit git ls-remote "$HTTPD_URL/dumb/repo-detached.git" >actual && + test_cmp expect actual +' + test_expect_success 'create password-protected repository' ' mkdir -p "$HTTPD_DOCUMENT_ROOT_PATH/auth/dumb/" && cp -Rf "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" \ --=20 2.45.0-rc1 --C3an7qiP+h5x+o4H Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEF9hrgiFbCdvenl/rVbJhu7ckPpQFAmYvP30ACgkQVbJhu7ck PpS/yQ//YCVR14XY3Pxq7EpSLbcUvaCu9Acs2KwOKibZJqNLGoNI5G60Maq7mBaN AeN0ZK43axQCA0vu778eSEqV9/SvlLi51wpJWp1li8HmFT4p3CtncgWE9TEobUGC Nee04kXCr54ZYyOK4bg9zdH69hOmhgJ+DSmG01NeG0Te+yv4IZ1cCeZ274D7D7gm R4QMgAZftoWQhggCOGlQ0AxP2XQKoAMkZNfa+P1B+MemYY1vCu9odRBdXsbSHRPg wzNNeU3JbsZ/mj8fwkf88DJN4ndf9Q7Qax8Z1y9tmDY6OFbRyw3DE+hWxghSbijZ eujbvElcQkdPFoVtxvtnIH7f2JMxRF8XK5IWFaCJEbVhTjAHPJJBE+tJkPmifPoi isYpLTQNPawtv8jBqJJUWu593Y1I5L1sKNSvAvnUSv+J+XDrG77XMh8YXb/a7ivA mcix6+qJA7ge6Jy76sXYZbvQO8ZFImcCs3Vz3ocrUCUQk8HyJSOaSiaLd2CZyH0d 5M5w8XcGVMwvNhmyR5YH6WcIpauOs1NNFxEOkTKBz2qsbLfXZtVSwGRXSlMmlAS7 Z2wnAuIFzODbjMi98sxHirHBTVMNNHW3gmDbpLq8hJ8ioIOHKyuz5aSHu2Cmm8MO gCKui5zjkt88u2cBF4qD8fxHJ39tURGnR/sbpVl/N37Liky07xQ= =Vmdc -----END PGP SIGNATURE----- --C3an7qiP+h5x+o4H--