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From: "Han-Wen Nienhuys via GitGitGadget" <gitgitgadget@gmail.com>
To: git@vger.kernel.org
Cc: Han-Wen Nienhuys <hanwenn@gmail.com>,
	Han-Wen Nienhuys <hanwen@google.com>
Subject: [PATCH v2 4/4] refs: read FETCH_HEAD and MERGE_HEAD generically
Date: Wed, 19 Aug 2020 14:27:58 +0000	[thread overview]
Message-ID: <a3e903e4c0b29a3c37a43b0e76060aa3bb250cfa.1597847278.git.gitgitgadget@gmail.com> (raw)
In-Reply-To: <pull.705.v2.git.1597847278.gitgitgadget@gmail.com>

From: Han-Wen Nienhuys <hanwen@google.com>

The FETCH_HEAD and MERGE_HEAD refs must be stored in a file, regardless of the
type of ref backend. This is because they can hold more than just a single ref.

To accomodate them for alternate ref backends, read them from a file generically
in refs_read_raw_ref()

Signed-off-by: Han-Wen Nienhuys <hanwen@google.com>
---
 refs.c | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/refs.c b/refs.c
index cf91711968..3ee3afaf41 100644
--- a/refs.c
+++ b/refs.c
@@ -1527,11 +1527,37 @@ int for_each_rawref(each_ref_fn fn, void *cb_data)
 	return refs_for_each_rawref(get_main_ref_store(the_repository), fn, cb_data);
 }
 
+static int refs_read_special_head(struct ref_store *ref_store,
+				  const char *refname, struct object_id *oid,
+				  struct strbuf *referent, unsigned int *type)
+{
+	struct strbuf full_path = STRBUF_INIT;
+	struct strbuf content = STRBUF_INIT;
+	int result = -1;
+	strbuf_addf(&full_path, "%s/%s", ref_store->gitdir, refname);
+
+	if (strbuf_read_file(&content, full_path.buf, 0) < 0)
+		goto done;
+
+	result = parse_loose_ref_contents(content.buf, oid, referent, type);
+
+done:
+	strbuf_release(&full_path);
+	strbuf_release(&content);
+	return result;
+}
+
 int refs_read_raw_ref(struct ref_store *ref_store,
 		      const char *refname, struct object_id *oid,
 		      struct strbuf *referent, unsigned int *type)
 {
-	return ref_store->be->read_raw_ref(ref_store, refname, oid, referent, type);
+	if (!strcmp(refname, "FETCH_HEAD") || !strcmp(refname, "MERGE_HEAD")) {
+		return refs_read_special_head(ref_store, refname, oid, referent,
+					      type);
+	}
+
+	return ref_store->be->read_raw_ref(ref_store, refname, oid, referent,
+					   type);
 }
 
 /* This function needs to return a meaningful errno on failure */
-- 
gitgitgadget

  parent reply	other threads:[~2020-08-19 14:28 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-17 15:39 [PATCH 0/4] Handle FETCH_HEAD generically Han-Wen Nienhuys via GitGitGadget
2020-08-17 15:39 ` [PATCH 1/4] Split off reading loose ref data in separate function Han-Wen Nienhuys via GitGitGadget
2020-08-17 15:39 ` [PATCH 2/4] refs: fix comment about submodule ref_stores Han-Wen Nienhuys via GitGitGadget
2020-08-17 15:39 ` [PATCH 3/4] refs: move gitdir into base ref_store Han-Wen Nienhuys via GitGitGadget
2020-08-17 15:39 ` [PATCH 4/4] refs: read FETCH_HEAD generically Han-Wen Nienhuys via GitGitGadget
2020-08-17 19:40 ` [PATCH 0/4] Handle " Junio C Hamano
2020-08-19 14:27 ` [PATCH v2 0/4] Handle FETCH_HEAD and MERGE_HEAD generically Han-Wen Nienhuys via GitGitGadget
2020-08-19 14:27   ` [PATCH v2 1/4] refs: split off reading loose ref data in separate function Han-Wen Nienhuys via GitGitGadget
2020-08-19 14:27   ` [PATCH v2 2/4] refs: fix comment about submodule ref_stores Han-Wen Nienhuys via GitGitGadget
2020-08-19 14:27   ` [PATCH v2 3/4] refs: move gitdir into base ref_store Han-Wen Nienhuys via GitGitGadget
2020-08-19 14:27   ` Han-Wen Nienhuys via GitGitGadget [this message]
2020-08-19 21:09   ` [PATCH v2 0/4] Handle FETCH_HEAD and MERGE_HEAD generically Junio C Hamano

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