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From: David Turner <dturner@twopensource.com>
To: git@vger.kernel.org, mhagger@alum.mit.edu
Cc: Ronnie Sahlberg <sahlberg@google.com>,
	David Turner <dturner@twopensource.com>
Subject: [PATCH v5 03/27] refs: add a backend method structure with transaction functions
Date: Thu, 18 Feb 2016 00:17:26 -0500	[thread overview]
Message-ID: <1455772670-21142-4-git-send-email-dturner@twopensource.com> (raw)
In-Reply-To: <1455772670-21142-1-git-send-email-dturner@twopensource.com>

From: Ronnie Sahlberg <sahlberg@google.com>

Add a ref structure for storage backend methods. Start by adding a
method pointer for the transaction commit function.

Add a function set_refs_backend to switch between storage
backends. The files based storage backend is the default.

Signed-off-by: Ronnie Sahlberg <sahlberg@google.com>
Signed-off-by: David Turner <dturner@twopensource.com>
---
 refs.c               | 40 ++++++++++++++++++++++++++++++++++++++++
 refs.h               |  7 +++++++
 refs/files-backend.c | 10 ++++++++--
 refs/refs-internal.h | 14 +++++++++++++-
 4 files changed, 68 insertions(+), 3 deletions(-)

diff --git a/refs.c b/refs.c
index c38311b..ac885cb 100644
--- a/refs.c
+++ b/refs.c
@@ -10,6 +10,39 @@
 #include "tag.h"
 
 /*
+ * We always have a files backend and it is the default.
+ */
+static struct ref_storage_be *the_refs_backend = &refs_be_files;
+/*
+ * List of all available backends
+ */
+static struct ref_storage_be *refs_backends = &refs_be_files;
+
+int set_ref_storage_backend(const char *name)
+{
+	struct ref_storage_be *be;
+
+	for (be = refs_backends; be; be = be->next)
+		if (!strcmp(be->name, name)) {
+			the_refs_backend = be;
+			return 0;
+		}
+	return 1;
+}
+
+int ref_storage_backend_exists(const char *name)
+{
+	struct ref_storage_be *be;
+
+	for (be = refs_backends; be; be = be->next)
+		if (!strcmp(be->name, name)) {
+			the_refs_backend = be;
+			return 1;
+		}
+	return 0;
+}
+
+/*
  * How to handle various characters in refnames:
  * 0: An acceptable character for refs
  * 1: End-of-component
@@ -1157,3 +1190,10 @@ int for_each_rawref(each_ref_fn fn, void *cb_data)
 	return do_for_each_ref(NULL, "", fn, 0,
 			       DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
 }
+
+/* backend functions */
+int ref_transaction_commit(struct ref_transaction *transaction,
+			   struct strbuf *err)
+{
+	return the_refs_backend->transaction_commit(transaction, err);
+}
diff --git a/refs.h b/refs.h
index 3c3da29..5bc3fbc 100644
--- a/refs.h
+++ b/refs.h
@@ -508,4 +508,11 @@ extern int reflog_expire(const char *refname, const unsigned char *sha1,
 			 reflog_expiry_cleanup_fn cleanup_fn,
 			 void *policy_cb_data);
 
+/*
+ * Switch to an alternate ref storage backend.
+ */
+int set_ref_storage_backend(const char *name);
+
+int ref_storage_backend_exists(const char *name);
+
 #endif /* REFS_H */
diff --git a/refs/files-backend.c b/refs/files-backend.c
index fd664d6..caeb478 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -3066,8 +3066,8 @@ static int ref_update_reject_duplicates(struct string_list *refnames,
 	return 0;
 }
 
-int ref_transaction_commit(struct ref_transaction *transaction,
-			   struct strbuf *err)
+static int files_transaction_commit(struct ref_transaction *transaction,
+				    struct strbuf *err)
 {
 	int ret = 0, i;
 	int n = transaction->nr;
@@ -3453,3 +3453,9 @@ int reflog_expire(const char *refname, const unsigned char *sha1,
 	unlock_ref(lock);
 	return -1;
 }
+
+struct ref_storage_be refs_be_files = {
+	NULL,
+	"files",
+	files_transaction_commit,
+};
diff --git a/refs/refs-internal.h b/refs/refs-internal.h
index 92aae80..c240ca6 100644
--- a/refs/refs-internal.h
+++ b/refs/refs-internal.h
@@ -197,7 +197,6 @@ const char *find_descendant_ref(const char *dirname,
 
 int rename_ref_available(const char *oldname, const char *newname);
 
-
 /* Include broken references in a do_for_each_ref*() iteration: */
 #define DO_FOR_EACH_INCLUDE_BROKEN 0x01
 
@@ -206,4 +205,17 @@ int rename_ref_available(const char *oldname, const char *newname);
  */
 int do_for_each_ref(const char *submodule, const char *base,
 		    each_ref_fn fn, int trim, int flags, void *cb_data);
+
+/* refs backends */
+typedef int ref_transaction_commit_fn(struct ref_transaction *transaction,
+				      struct strbuf *err);
+
+struct ref_storage_be {
+	struct ref_storage_be *next;
+	const char *name;
+	ref_transaction_commit_fn *transaction_commit;
+};
+
+extern struct ref_storage_be refs_be_files;
+
 #endif /* REFS_REFS_INTERNAL_H */
-- 
2.4.2.767.g62658d5-twtrsrc

  parent reply	other threads:[~2016-02-18  5:20 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-02-18  5:17 [PATCH v5 00/27] refs backends David Turner
2016-02-18  5:17 ` [PATCH v5 01/27] refs: Move head_ref{,_submodule} to the common code David Turner
2016-02-18  5:17 ` [PATCH v5 02/27] refs: move for_each_*ref* functions into " David Turner
2016-02-18  5:17 ` David Turner [this message]
2016-02-18  5:17 ` [PATCH v5 04/27] refs: add methods for misc ref operations David Turner
2016-02-18  5:17 ` [PATCH v5 05/27] refs: add method for do_for_each_ref David Turner
2016-02-18  5:17 ` [PATCH v5 06/27] refs: add do_for_each_per_worktree_ref David Turner
2016-02-18  5:17 ` [PATCH v5 07/27] refs: add methods for reflog David Turner
2016-02-18  5:17 ` [PATCH v5 08/27] refs: add method for initial ref transaction commit David Turner
2016-02-18  5:17 ` [PATCH v5 09/27] refs: add method for delete_refs David Turner
2016-02-18  5:17 ` [PATCH v5 10/27] refs: add methods to init refs db David Turner
2016-02-18  5:17 ` [PATCH v5 11/27] refs: add method to rename refs David Turner
2016-02-18  5:17 ` [PATCH v5 12/27] refs: forbid cross-backend ref renames David Turner
2016-02-20  4:30   ` Duy Nguyen
2016-02-24 20:48     ` David Turner
2016-02-18  5:17 ` [PATCH v5 13/27] refs: make lock generic David Turner
2016-02-18  5:17 ` [PATCH v5 14/27] refs: move duplicate check to common code David Turner
2016-02-18  5:17 ` [PATCH v5 15/27] refs: allow log-only updates David Turner
2016-02-18  5:17 ` [PATCH v5 16/27] refs: don't dereference on rename David Turner
2016-02-18  5:17 ` [PATCH v5 17/27] refs: on symref reflog expire, lock symref not referrent David Turner
2016-02-18  5:17 ` [PATCH v5 18/27] refs: resolve symbolic refs first David Turner
2016-02-18  5:17 ` [PATCH v5 19/27] refs: always handle non-normal refs in files backend David Turner
2016-02-18  5:17 ` [PATCH v5 20/27] init: allow alternate ref strorage to be set for new repos David Turner
2016-02-18  5:17 ` [PATCH v5 21/27] refs: check submodules' ref storage config David Turner
2016-02-18  5:17 ` [PATCH v5 22/27] clone: allow ref storage backend to be set for clone David Turner
2016-02-18  5:17 ` [PATCH v5 23/27] svn: learn ref-storage argument David Turner
2016-02-20 23:55   ` Eric Wong
2016-02-23 18:08     ` David Turner
2016-02-18  5:17 ` [PATCH v5 24/27] refs: add register_ref_storage_backends() David Turner
2016-02-18  5:17 ` [PATCH v5 25/27] refs: add LMDB refs storage backend David Turner
2016-02-18  8:50   ` Duy Nguyen
2016-02-18 20:23     ` David Turner
2016-02-18 21:15       ` Junio C Hamano
2016-02-19  2:54       ` Duy Nguyen
2016-02-19 19:10         ` David Turner
2016-02-20 13:14       ` Duy Nguyen
2016-02-24 20:41         ` David Turner
2016-02-20 21:32       ` Junio C Hamano
2016-02-19 22:49     ` David Turner
2016-02-19 23:08       ` Junio C Hamano
2016-02-20  2:58       ` Duy Nguyen
2016-02-24 20:43         ` David Turner
2016-02-25 10:07           ` Duy Nguyen
2016-02-20  8:59   ` Duy Nguyen
2016-02-24 20:37     ` David Turner
2016-02-25 10:12       ` Duy Nguyen
2016-02-25 20:05         ` [PATCH] refs: document transaction semantics David Turner
2016-02-25 20:10           ` David Turner
2016-02-25 20:34             ` Junio C Hamano
2016-02-25 20:50               ` David Turner
2016-02-18  5:17 ` [PATCH v5 26/27] refs: tests for lmdb backend David Turner
2016-02-18  5:17 ` [PATCH v5 27/27] tests: add ref-storage argument David Turner

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