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From: "Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>
To: git@vger.kernel.org
Cc: Johannes Schindelin <johannes.schindelin@gmx.de>,
	Johannes Schindelin <johannes.schindelin@gmx.de>
Subject: [PATCH 1/5] Implement `scalar diagnose`
Date: Wed, 26 Jan 2022 08:41:43 +0000	[thread overview]
Message-ID: <ce85506e7a4313a4ae21ef712b84d8396ac45cdc.1643186507.git.gitgitgadget@gmail.com> (raw)
In-Reply-To: <pull.1128.git.1643186507.gitgitgadget@gmail.com>

From: Johannes Schindelin <johannes.schindelin@gmx.de>

Over the course of Scalar's development, it became obvious that there is
a need for a command that can gather all kinds of useful information
that can help identify the most typical problems with large
worktrees/repositories.

The `diagnose` command is the culmination of this hard-won knowledge: it
gathers the installed hooks, the config, a couple statistics describing
the data shape, among other pieces of information, and then wraps
everything up in a tidy, neat `.zip` archive.

Note: originally, Scalar was implemented in C# using the .NET API, where
we had the luxury of a comprehensive standard library that includes
basic functionality such as writing a `.zip` file. In the C version, we
lack such a commodity. Rather than introducing a dependency on, say,
libzip, we slightly abuse Git's `archive` command: Instead of writing
the `.zip` file directly, we stage the file contents in a Git index of a
temporary, bare repository, only to let `git archive` have at it, and
finally removing the temporary repository.

Also note: Due to the frequently-spawned `git hash-object` processes,
this command is quite a bit slow on Windows. Should it turn out to be a
big problem, the lack of a batch mode of the `hash-object` command could
potentially be worked around via using `git fast-import` with a crafted
`stdin`.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 contrib/scalar/scalar.c          | 170 +++++++++++++++++++++++++++++++
 contrib/scalar/scalar.txt        |  12 +++
 contrib/scalar/t/t9099-scalar.sh |  13 +++
 3 files changed, 195 insertions(+)

diff --git a/contrib/scalar/scalar.c b/contrib/scalar/scalar.c
index 1ce9c2b00e8..13f2b0f4d5a 100644
--- a/contrib/scalar/scalar.c
+++ b/contrib/scalar/scalar.c
@@ -259,6 +259,108 @@ static int unregister_dir(void)
 	return res;
 }
 
+static int stage(const char *git_dir, struct strbuf *buf, const char *path)
+{
+	struct strbuf cacheinfo = STRBUF_INIT;
+	struct child_process cp = CHILD_PROCESS_INIT;
+	int res;
+
+	strbuf_addstr(&cacheinfo, "100644,");
+
+	cp.git_cmd = 1;
+	strvec_pushl(&cp.args, "--git-dir", git_dir,
+		     "hash-object", "-w", "--stdin", NULL);
+	res = pipe_command(&cp, buf->buf, buf->len, &cacheinfo, 256, NULL, 0);
+	if (!res) {
+		strbuf_rtrim(&cacheinfo);
+		strbuf_addch(&cacheinfo, ',');
+		/* We cannot stage `.git`, use `_git` instead. */
+		if (starts_with(path, ".git/"))
+			strbuf_addf(&cacheinfo, "_%s", path + 1);
+		else
+			strbuf_addstr(&cacheinfo, path);
+
+		child_process_init(&cp);
+		cp.git_cmd = 1;
+		strvec_pushl(&cp.args, "--git-dir", git_dir,
+			     "update-index", "--add", "--cacheinfo",
+			     cacheinfo.buf, NULL);
+		res = run_command(&cp);
+	}
+
+	strbuf_release(&cacheinfo);
+	return res;
+}
+
+static int stage_file(const char *git_dir, const char *path)
+{
+	struct strbuf buf = STRBUF_INIT;
+	int res;
+
+	if (strbuf_read_file(&buf, path, 0) < 0)
+		return error(_("could not read '%s'"), path);
+
+	res = stage(git_dir, &buf, path);
+
+	strbuf_release(&buf);
+	return res;
+}
+
+static int stage_directory(const char *git_dir, const char *path, int recurse)
+{
+	int at_root = !*path;
+	DIR *dir = opendir(at_root ? "." : path);
+	struct dirent *e;
+	struct strbuf buf = STRBUF_INIT;
+	size_t len;
+	int res = 0;
+
+	if (!dir)
+		return error(_("could not open directory '%s'"), path);
+
+	if (!at_root)
+		strbuf_addf(&buf, "%s/", path);
+	len = buf.len;
+
+	while (!res && (e = readdir(dir))) {
+		if (!strcmp(".", e->d_name) || !strcmp("..", e->d_name))
+			continue;
+
+		strbuf_setlen(&buf, len);
+		strbuf_addstr(&buf, e->d_name);
+
+		if ((e->d_type == DT_REG && stage_file(git_dir, buf.buf)) ||
+		    (e->d_type == DT_DIR && recurse &&
+		     stage_directory(git_dir, buf.buf, recurse)))
+			res = -1;
+	}
+
+	closedir(dir);
+	strbuf_release(&buf);
+	return res;
+}
+
+static int index_to_zip(const char *git_dir)
+{
+	struct child_process cp = CHILD_PROCESS_INIT;
+	struct strbuf oid = STRBUF_INIT;
+
+	cp.git_cmd = 1;
+	strvec_pushl(&cp.args, "--git-dir", git_dir, "write-tree", NULL);
+	if (pipe_command(&cp, NULL, 0, &oid, the_hash_algo->hexsz + 1,
+			 NULL, 0))
+		return error(_("could not write temporary tree object"));
+
+	strbuf_rtrim(&oid);
+	child_process_init(&cp);
+	cp.git_cmd = 1;
+	strvec_pushl(&cp.args, "--git-dir", git_dir, "archive", "-o", NULL);
+	strvec_pushf(&cp.args, "%s.zip", git_dir);
+	strvec_pushl(&cp.args, oid.buf, "--", NULL);
+	strbuf_release(&oid);
+	return run_command(&cp);
+}
+
 /* printf-style interface, expects `<key>=<value>` argument */
 static int set_config(const char *fmt, ...)
 {
@@ -499,6 +601,73 @@ cleanup:
 	return res;
 }
 
+static int cmd_diagnose(int argc, const char **argv)
+{
+	struct option options[] = {
+		OPT_END(),
+	};
+	const char * const usage[] = {
+		N_("scalar diagnose [<enlistment>]"),
+		NULL
+	};
+	struct strbuf tmp_dir = STRBUF_INIT;
+	time_t now = time(NULL);
+	struct tm tm;
+	struct strbuf path = STRBUF_INIT, buf = STRBUF_INIT;
+	int res = 0;
+
+	argc = parse_options(argc, argv, NULL, options,
+			     usage, 0);
+
+	setup_enlistment_directory(argc, argv, usage, options, &buf);
+
+	strbuf_addstr(&buf, "/.scalarDiagnostics/scalar_");
+	strbuf_addftime(&buf, "%Y%m%d_%H%M%S", localtime_r(&now, &tm), 0, 0);
+	if (run_git("init", "-q", "-b", "dummy", "--bare", buf.buf, NULL)) {
+		res = error(_("could not initialize temporary repository: %s"),
+			    buf.buf);
+		goto diagnose_cleanup;
+	}
+	strbuf_realpath(&tmp_dir, buf.buf, 1);
+
+	strbuf_reset(&buf);
+	strbuf_addf(&buf, "Collecting diagnostic info into temp folder %s\n\n",
+		    tmp_dir.buf);
+
+	get_version_info(&buf, 1);
+
+	strbuf_addf(&buf, "Enlistment root: %s\n", the_repository->worktree);
+	fwrite(buf.buf, buf.len, 1, stdout);
+
+	if ((res = stage(tmp_dir.buf, &buf, "diagnostics.log")))
+		goto diagnose_cleanup;
+
+	if ((res = stage_directory(tmp_dir.buf, ".git", 0)) ||
+	    (res = stage_directory(tmp_dir.buf, ".git/hooks", 0)) ||
+	    (res = stage_directory(tmp_dir.buf, ".git/info", 0)) ||
+	    (res = stage_directory(tmp_dir.buf, ".git/logs", 1)) ||
+	    (res = stage_directory(tmp_dir.buf, ".git/objects/info", 0)))
+		goto diagnose_cleanup;
+
+	res = index_to_zip(tmp_dir.buf);
+
+	if (!res)
+		res = remove_dir_recursively(&tmp_dir, 0);
+
+	if (!res)
+		printf("\n"
+		       "Diagnostics complete.\n"
+		       "All of the gathered info is captured in '%s.zip'\n",
+		       tmp_dir.buf);
+
+diagnose_cleanup:
+	strbuf_release(&tmp_dir);
+	strbuf_release(&path);
+	strbuf_release(&buf);
+
+	return res;
+}
+
 static int cmd_list(int argc, const char **argv)
 {
 	if (argc != 1)
@@ -800,6 +969,7 @@ static struct {
 	{ "reconfigure", cmd_reconfigure },
 	{ "delete", cmd_delete },
 	{ "version", cmd_version },
+	{ "diagnose", cmd_diagnose },
 	{ NULL, NULL},
 };
 
diff --git a/contrib/scalar/scalar.txt b/contrib/scalar/scalar.txt
index f416d637289..22583fe046e 100644
--- a/contrib/scalar/scalar.txt
+++ b/contrib/scalar/scalar.txt
@@ -14,6 +14,7 @@ scalar register [<enlistment>]
 scalar unregister [<enlistment>]
 scalar run ( all | config | commit-graph | fetch | loose-objects | pack-files ) [<enlistment>]
 scalar reconfigure [ --all | <enlistment> ]
+scalar diagnose [<enlistment>]
 scalar delete <enlistment>
 
 DESCRIPTION
@@ -129,6 +130,17 @@ reconfigure the enlistment.
 With the `--all` option, all enlistments currently registered with Scalar
 will be reconfigured. Use this option after each Scalar upgrade.
 
+Diagnose
+~~~~~~~~
+
+diagnose [<enlistment>]::
+    When reporting issues with Scalar, it is often helpful to provide the
+    information gathered by this command, including logs and certain
+    statistics describing the data shape of the current enlistment.
++
+The output of this command is a `.zip` file that is written into
+a directory adjacent to the worktree in the `src` directory.
+
 Delete
 ~~~~~~
 
diff --git a/contrib/scalar/t/t9099-scalar.sh b/contrib/scalar/t/t9099-scalar.sh
index 2e1502ad45e..ecd06e207c2 100755
--- a/contrib/scalar/t/t9099-scalar.sh
+++ b/contrib/scalar/t/t9099-scalar.sh
@@ -65,6 +65,19 @@ test_expect_success 'scalar clone' '
 	)
 '
 
+SQ="'"
+test_expect_success UNZIP 'scalar diagnose' '
+	scalar diagnose cloned >out &&
+	sed -n "s/.*$SQ\\(.*\\.zip\\)$SQ.*/\\1/p" <out >zip_path &&
+	zip_path=$(cat zip_path) &&
+	test -n "$zip_path" &&
+	unzip -v "$zip_path" &&
+	folder=${zip_path%.zip} &&
+	test_path_is_missing "$folder" &&
+	unzip -p "$zip_path" diagnostics.log >out &&
+	test_file_not_empty out
+'
+
 test_expect_success 'scalar reconfigure' '
 	git init one/src &&
 	scalar register one &&
-- 
gitgitgadget


  reply	other threads:[~2022-01-26  8:41 UTC|newest]

Thread overview: 140+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-26  8:41 [PATCH 0/5] scalar: implement the subcommand "diagnose" Johannes Schindelin via GitGitGadget
2022-01-26  8:41 ` Johannes Schindelin via GitGitGadget [this message]
2022-01-26  9:34   ` [PATCH 1/5] Implement `scalar diagnose` René Scharfe
2022-01-26 22:20     ` Taylor Blau
2022-02-06 21:34       ` Johannes Schindelin
2022-01-27 19:38   ` Elijah Newren
2022-01-26  8:41 ` [PATCH 2/5] scalar diagnose: include disk space information Johannes Schindelin via GitGitGadget
2022-01-26  8:41 ` [PATCH 3/5] scalar: teach `diagnose` to gather packfile info Matthew John Cheetham via GitGitGadget
2022-01-26 22:43   ` Taylor Blau
2022-01-27 15:14     ` Derrick Stolee
2022-02-06 21:38       ` Johannes Schindelin
2022-01-26  8:41 ` [PATCH 4/5] scalar: teach `diagnose` to gather loose objects information Matthew John Cheetham via GitGitGadget
2022-01-26 22:50   ` Taylor Blau
2022-01-27 15:17     ` Derrick Stolee
2022-01-27 18:59   ` Elijah Newren
2022-02-06 21:25     ` Johannes Schindelin
2022-01-26  8:41 ` [PATCH 5/5] scalar diagnose: show a spinner while staging content Johannes Schindelin via GitGitGadget
2022-01-27 15:19 ` [PATCH 0/5] scalar: implement the subcommand "diagnose" Derrick Stolee
2022-02-06 21:13   ` Johannes Schindelin
2022-02-06 22:39 ` [PATCH v2 0/6] " Johannes Schindelin via GitGitGadget
2022-02-06 22:39   ` [PATCH v2 1/6] archive: optionally add "virtual" files Johannes Schindelin via GitGitGadget
2022-02-07 19:55     ` René Scharfe
2022-02-07 23:30       ` Junio C Hamano
2022-02-08 13:12         ` Johannes Schindelin
2022-02-08 17:44           ` Junio C Hamano
2022-02-08 20:58             ` René Scharfe
2022-02-09 22:48               ` Junio C Hamano
2022-02-10 19:10                 ` René Scharfe
2022-02-10 19:23                   ` Junio C Hamano
2022-02-11 19:16                     ` René Scharfe
2022-02-11 21:27                       ` Junio C Hamano
2022-02-12  9:12                         ` René Scharfe
2022-02-13  6:25                           ` Junio C Hamano
2022-02-13  9:02                             ` René Scharfe
2022-02-14 17:22                               ` Junio C Hamano
2022-02-08 12:54       ` Johannes Schindelin
2022-02-06 22:39   ` [PATCH v2 2/6] scalar: validate the optional enlistment argument Johannes Schindelin via GitGitGadget
2022-02-06 22:39   ` [PATCH v2 3/6] Implement `scalar diagnose` Johannes Schindelin via GitGitGadget
2022-02-07 19:55     ` René Scharfe
2022-02-08 12:08       ` Johannes Schindelin
2022-02-06 22:39   ` [PATCH v2 4/6] scalar diagnose: include disk space information Johannes Schindelin via GitGitGadget
2022-02-06 22:39   ` [PATCH v2 5/6] scalar: teach `diagnose` to gather packfile info Matthew John Cheetham via GitGitGadget
2022-02-06 22:39   ` [PATCH v2 6/6] scalar: teach `diagnose` to gather loose objects information Matthew John Cheetham via GitGitGadget
2022-05-04 15:25   ` [PATCH v3 0/7] scalar: implement the subcommand "diagnose" Johannes Schindelin via GitGitGadget
2022-05-04 15:25     ` [PATCH v3 1/7] archive: optionally add "virtual" files Johannes Schindelin via GitGitGadget
2022-05-04 15:25     ` [PATCH v3 2/7] archive --add-file-with-contents: allow paths containing colons Johannes Schindelin via GitGitGadget
2022-05-07  2:06       ` Elijah Newren
2022-05-09 21:04         ` Johannes Schindelin
2022-05-04 15:25     ` [PATCH v3 3/7] scalar: validate the optional enlistment argument Johannes Schindelin via GitGitGadget
2022-05-04 15:25     ` [PATCH v3 4/7] Implement `scalar diagnose` Johannes Schindelin via GitGitGadget
2022-05-04 15:25     ` [PATCH v3 5/7] scalar diagnose: include disk space information Johannes Schindelin via GitGitGadget
2022-05-04 15:25     ` [PATCH v3 6/7] scalar: teach `diagnose` to gather packfile info Matthew John Cheetham via GitGitGadget
2022-05-04 15:25     ` [PATCH v3 7/7] scalar: teach `diagnose` to gather loose objects information Matthew John Cheetham via GitGitGadget
2022-05-07  2:23     ` [PATCH v3 0/7] scalar: implement the subcommand "diagnose" Elijah Newren
2022-05-10 19:26     ` [PATCH v4 " Johannes Schindelin via GitGitGadget
2022-05-10 19:26       ` [PATCH v4 1/7] archive: optionally add "virtual" files Johannes Schindelin via GitGitGadget
2022-05-10 21:48         ` Junio C Hamano
2022-05-10 22:06           ` rsbecker
2022-05-10 23:21             ` Junio C Hamano
2022-05-11 16:14               ` René Scharfe
2022-05-11 19:27                 ` Junio C Hamano
2022-05-12 16:16                   ` René Scharfe
2022-05-12 18:15                     ` Junio C Hamano
2022-05-12 21:31                       ` Junio C Hamano
2022-05-14  7:06                         ` René Scharfe
2022-05-12 22:31           ` [PATCH] fixup! " Junio C Hamano
2022-05-10 19:26       ` [PATCH v4 2/7] archive --add-file-with-contents: allow paths containing colons Johannes Schindelin via GitGitGadget
2022-05-10 21:56         ` Junio C Hamano
2022-05-10 22:23           ` rsbecker
2022-05-19 18:12             ` Johannes Schindelin
2022-05-19 18:09           ` Johannes Schindelin
2022-05-19 18:44             ` Junio C Hamano
2022-05-10 19:27       ` [PATCH v4 3/7] scalar: validate the optional enlistment argument Johannes Schindelin via GitGitGadget
2022-05-17 14:51         ` Ævar Arnfjörð Bjarmason
2022-05-18 17:35           ` Junio C Hamano
2022-05-20  7:30             ` Ævar Arnfjörð Bjarmason
2022-05-20 15:55               ` Johannes Schindelin
2022-05-21  9:54                 ` Ævar Arnfjörð Bjarmason
2022-05-22  5:50                   ` Junio C Hamano
2022-05-24 12:25                     ` Johannes Schindelin
2022-05-24 18:11                       ` Ævar Arnfjörð Bjarmason
2022-05-24 19:29                         ` Junio C Hamano
2022-05-25 10:31                           ` Johannes Schindelin
2022-05-10 19:27       ` [PATCH v4 4/7] Implement `scalar diagnose` Johannes Schindelin via GitGitGadget
2022-05-17 14:53         ` Ævar Arnfjörð Bjarmason
2022-05-10 19:27       ` [PATCH v4 5/7] scalar diagnose: include disk space information Johannes Schindelin via GitGitGadget
2022-05-10 19:27       ` [PATCH v4 6/7] scalar: teach `diagnose` to gather packfile info Matthew John Cheetham via GitGitGadget
2022-05-10 19:27       ` [PATCH v4 7/7] scalar: teach `diagnose` to gather loose objects information Matthew John Cheetham via GitGitGadget
2022-05-17 15:03       ` [PATCH v4 0/7] scalar: implement the subcommand "diagnose" Ævar Arnfjörð Bjarmason
2022-05-17 15:28         ` rsbecker
2022-05-19 18:17           ` Johannes Schindelin
2022-05-19 18:17       ` [PATCH v5 " Johannes Schindelin via GitGitGadget
2022-05-19 18:17         ` [PATCH v5 1/7] archive: optionally add "virtual" files Johannes Schindelin via GitGitGadget
2022-05-20 14:41           ` René Scharfe
2022-05-20 16:21             ` Junio C Hamano
2022-05-19 18:17         ` [PATCH v5 2/7] archive --add-file-with-contents: allow paths containing colons Johannes Schindelin via GitGitGadget
2022-05-19 18:17         ` [PATCH v5 3/7] scalar: validate the optional enlistment argument Johannes Schindelin via GitGitGadget
2022-05-19 18:18         ` [PATCH v5 4/7] Implement `scalar diagnose` Johannes Schindelin via GitGitGadget
2022-05-19 18:18         ` [PATCH v5 5/7] scalar diagnose: include disk space information Johannes Schindelin via GitGitGadget
2022-05-19 18:18         ` [PATCH v5 6/7] scalar: teach `diagnose` to gather packfile info Matthew John Cheetham via GitGitGadget
2022-05-19 18:18         ` [PATCH v5 7/7] scalar: teach `diagnose` to gather loose objects information Matthew John Cheetham via GitGitGadget
2022-05-19 19:23         ` [PATCH v5 0/7] scalar: implement the subcommand "diagnose" Junio C Hamano
2022-05-21 15:08         ` [PATCH v6 " Johannes Schindelin via GitGitGadget
2022-05-21 15:08           ` [PATCH v6 1/7] archive: optionally add "virtual" files Johannes Schindelin via GitGitGadget
2022-05-25 21:11             ` Junio C Hamano
2022-05-26  9:09               ` René Scharfe
2022-05-26 17:10                 ` Junio C Hamano
2022-05-26 18:57                   ` René Scharfe
2022-05-26 20:16                     ` Junio C Hamano
2022-05-27 17:02                       ` René Scharfe
2022-05-27 19:01                         ` Junio C Hamano
2022-05-28  6:57                           ` René Scharfe
2022-05-21 15:08           ` [PATCH v6 2/7] archive --add-virtual-file: allow paths containing colons Johannes Schindelin via GitGitGadget
2022-05-25 20:22             ` Junio C Hamano
2022-05-25 21:42               ` Junio C Hamano
2022-05-25 22:34                 ` Junio C Hamano
2022-05-21 15:08           ` [PATCH v6 3/7] scalar: validate the optional enlistment argument Johannes Schindelin via GitGitGadget
2022-05-21 15:08           ` [PATCH v6 4/7] Implement `scalar diagnose` Johannes Schindelin via GitGitGadget
2022-05-21 15:08           ` [PATCH v6 5/7] scalar diagnose: include disk space information Johannes Schindelin via GitGitGadget
2022-05-21 15:08           ` [PATCH v6 6/7] scalar: teach `diagnose` to gather packfile info Matthew John Cheetham via GitGitGadget
2022-05-21 15:08           ` [PATCH v6 7/7] scalar: teach `diagnose` to gather loose objects information Matthew John Cheetham via GitGitGadget
2022-05-28 23:11           ` [PATCH v6+ 0/7] js/scalar-diagnose rebased Junio C Hamano
2022-05-28 23:11             ` [PATCH v6+ 1/7] archive: optionally add "virtual" files Junio C Hamano
2022-05-28 23:11             ` [PATCH v6+ 2/7] archive --add-virtual-file: allow paths containing colons Junio C Hamano
2022-06-15 18:16               ` Adam Dinwoodie
2022-06-15 20:00                 ` Junio C Hamano
2022-06-15 21:36                   ` Adam Dinwoodie
2022-06-18 20:19                     ` Johannes Schindelin
2022-06-18 22:05                       ` Junio C Hamano
2022-06-20  9:41                       ` Adam Dinwoodie
2022-05-28 23:11             ` [PATCH v6+ 3/7] scalar: validate the optional enlistment argument Junio C Hamano
2022-05-28 23:11             ` [PATCH v6+ 4/7] scalar: implement `scalar diagnose` Junio C Hamano
2022-06-10  2:08               ` Ævar Arnfjörð Bjarmason
2022-06-10 16:44                 ` Junio C Hamano
2022-06-10 17:35                   ` Ævar Arnfjörð Bjarmason
2022-05-28 23:11             ` [PATCH v6+ 5/7] scalar diagnose: include disk space information Junio C Hamano
2022-05-28 23:11             ` [PATCH v6+ 6/7] scalar: teach `diagnose` to gather packfile info Junio C Hamano
2022-05-28 23:11             ` [PATCH v6+ 7/7] scalar: teach `diagnose` to gather loose objects information Junio C Hamano
2022-05-30 10:12             ` [PATCH v6+ 0/7] js/scalar-diagnose rebased Johannes Schindelin
2022-05-30 17:37               ` Junio C Hamano

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