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From: "Derrick Stolee via GitGitGadget" <gitgitgadget@gmail.com>
To: git@vger.kernel.org
Cc: git@jeffhostetler, Junio C Hamano <gitster@pobox.com>,
	Derrick Stolee <dstolee@microsoft.com>
Subject: [PATCH 1/3] fetch: add --[no-]show-forced-updates argument
Date: Tue, 18 Jun 2019 13:25:26 -0700 (PDT)	[thread overview]
Message-ID: <a4fe71618410bdb188b6850a61ec65e7b4da5897.1560889525.git.gitgitgadget@gmail.com> (raw)
In-Reply-To: <pull.273.git.gitgitgadget@gmail.com>

From: Derrick Stolee <dstolee@microsoft.com>

After updating a set of remove refs during a 'git fetch', we walk the
commits in the new ref value and not in the old ref value to discover
if the update was a forced update. This results in two things happening
during the command:

 1. The line including the ref update has an additional "(forced-update)"
    marker at the end.

 2. The ref log for that remote branch includes a bit saying that update
    is a forced update.

For many situations, this forced-update message happens infrequently, or
is a small bit of information among many ref updates. Many users ignore
these messages, but the calculation required here slows down their fetches
significantly. Keep in mind that they do not have the opportunity to
calculate a commit-graph file containing the newly-fetched commits, so
these comparisons can be very slow.

Add a '--[no-]show-forced-updates' option that allows a user to skip this
calculation. The only permanent result is dropping the forced-update bit
in the reflog.

Include a new fetch.showForcedUpdates config setting that allows this
behavior without including the argument in every command. The config
setting is overridden by the command-line arguments.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
---
 Documentation/config/fetch.txt  |  5 +++++
 Documentation/fetch-options.txt | 13 +++++++++++++
 builtin/fetch.c                 | 11 ++++++++++-
 t/t5510-fetch.sh                | 23 +++++++++++++++++++++++
 4 files changed, 51 insertions(+), 1 deletion(-)

diff --git a/Documentation/config/fetch.txt b/Documentation/config/fetch.txt
index cbfad6cdbb..ba890b5884 100644
--- a/Documentation/config/fetch.txt
+++ b/Documentation/config/fetch.txt
@@ -63,3 +63,8 @@ fetch.negotiationAlgorithm::
 	Unknown values will cause 'git fetch' to error out.
 +
 See also the `--negotiation-tip` option for linkgit:git-fetch[1].
+
+fetch.showForcedUpdates::
+	Set to false to enable `--no-show-forced-updates` in
+	linkgit:git-fetch[1] and linkgit:git-pull[1] commands.
+	Defaults to true.
diff --git a/Documentation/fetch-options.txt b/Documentation/fetch-options.txt
index 91c47752ec..5801d23ae4 100644
--- a/Documentation/fetch-options.txt
+++ b/Documentation/fetch-options.txt
@@ -221,6 +221,19 @@ endif::git-pull[]
 	When multiple `--server-option=<option>` are given, they are all
 	sent to the other side in the order listed on the command line.
 
+--show-forced-updates::
+	By default, git checks if a branch is force-updated during
+	fetch. This can be disabled through fetch.showForcedUpdates, but
+	the --show-forced-updates option guarantees this check occurs.
+	See linkgit:git-config[1].
+
+--no-show-forced-updates::
+	By default, git checks if a branch is force-updated during
+	fetch. Pass --no-show-forced-updates or set fetch.showForcedUpdates
+	to false to skip this check for performance reasons. If used during
+	'git-pull' the --ff-only option will still check for forced updates
+	before attempting a fast-forward update. See linkgit:git-config[1].
+
 -4::
 --ipv4::
 	Use IPv4 addresses only, ignoring IPv6 addresses.
diff --git a/builtin/fetch.c b/builtin/fetch.c
index 4ba63d5ac6..571c255218 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -39,6 +39,7 @@ enum {
 };
 
 static int fetch_prune_config = -1; /* unspecified */
+static int fetch_show_forced_updates = 1;
 static int prune = -1; /* unspecified */
 #define PRUNE_BY_DEFAULT 0 /* do we prune by default? */
 
@@ -79,6 +80,11 @@ static int git_fetch_config(const char *k, const char *v, void *cb)
 		return 0;
 	}
 
+	if (!strcmp(k, "fetch.showforcedupdates")) {
+		fetch_show_forced_updates = git_config_bool(k, v);
+		return 0;
+	}
+
 	if (!strcmp(k, "submodule.recurse")) {
 		int r = git_config_bool(k, v) ?
 			RECURSE_SUBMODULES_ON : RECURSE_SUBMODULES_OFF;
@@ -169,6 +175,8 @@ static struct option builtin_fetch_options[] = {
 	OPT_STRING_LIST(0, "negotiation-tip", &negotiation_tip, N_("revision"),
 			N_("report that we have only objects reachable from this object")),
 	OPT_PARSE_LIST_OBJECTS_FILTER(&filter_options),
+	OPT_BOOL(0, "show-forced-updates", &fetch_show_forced_updates,
+		 N_("check for forced-updates on all updated branches")),
 	OPT_END()
 };
 
@@ -773,9 +781,10 @@ static int update_local_ref(struct ref *ref,
 		return r;
 	}
 
-	if (in_merge_bases(current, updated)) {
+	if (!fetch_show_forced_updates || in_merge_bases(current, updated)) {
 		struct strbuf quickref = STRBUF_INIT;
 		int r;
+
 		strbuf_add_unique_abbrev(&quickref, &current->object.oid, DEFAULT_ABBREV);
 		strbuf_addstr(&quickref, "..");
 		strbuf_add_unique_abbrev(&quickref, &ref->new_oid, DEFAULT_ABBREV);
diff --git a/t/t5510-fetch.sh b/t/t5510-fetch.sh
index e98d90dd9b..139f7106f7 100755
--- a/t/t5510-fetch.sh
+++ b/t/t5510-fetch.sh
@@ -978,4 +978,27 @@ test_expect_success '--negotiation-tip limits "have" lines sent with HTTP protoc
 	check_negotiation_tip
 '
 
+test_expect_success '--no-show-forced-updates' '
+	mkdir forced-updates &&
+	(
+		cd forced-updates &&
+		git init &&
+		test_commit 1 &&
+		test_commit 2
+	) &&
+	git clone forced-updates forced-update-clone &&
+	git clone forced-updates no-forced-update-clone &&
+	git -C forced-updates reset --hard HEAD~1 &&
+	(
+		cd forced-update-clone &&
+		git fetch --show-forced-updates origin 2>output &&
+		test_i18ngrep "(forced update)" output
+	) &&
+	(
+		cd no-forced-update-clone &&
+		git fetch --no-show-forced-updates origin 2>output &&
+		! test_i18ngrep "(forced update)" output
+	)
+'
+
 test_done
-- 
gitgitgadget


  reply	other threads:[~2019-06-18 20:25 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-18 20:25 [PATCH 0/3] fetch: add --[no-]show-forced-updates Derrick Stolee via GitGitGadget
2019-06-18 20:25 ` Derrick Stolee via GitGitGadget [this message]
2019-07-30 21:29   ` [PATCH] t5510-fetch: fix negated 'test_i18ngrep' invocation SZEDER Gábor
2019-07-30 21:40     ` SZEDER Gábor
2019-07-31 10:35       ` Derrick Stolee
2019-08-01 15:53       ` [PATCH 0/3] tests: run non-httpd-specific tests before sourcing 'lib-httpd.sh' SZEDER Gábor
2019-08-01 15:53         ` [PATCH 1/3] t5510-fetch: run non-httpd-specific test " SZEDER Gábor
2019-08-01 17:51           ` Derrick Stolee
2019-08-01 15:53         ` [PATCH 2/3] t5703: run all non-httpd-specific tests " SZEDER Gábor
2019-08-01 15:53         ` [PATCH 3/3] tests: warn against appending non-httpd-specific tests at the end SZEDER Gábor
2019-08-01 17:41           ` SZEDER Gábor
2019-08-01 18:18             ` Junio C Hamano
2019-08-02 10:09               ` SZEDER Gábor
2019-08-02 16:37                 ` Junio C Hamano
2019-06-18 20:25 ` [PATCH 2/3] fetch: warn about forced updates in branch listing Derrick Stolee via GitGitGadget
2019-06-18 20:25 ` [PATCH 3/3] pull: add --[no-]show-forced-updates passthrough Derrick Stolee via GitGitGadget

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