Merge branch 'ds/background-maintenance-with-credential'

Background tasks "git maintenance" runs may need to use credential
information when going over the network, but a credential helper
may work only in an interactive environment, and end up blocking a
scheduled task waiting for UI.  Credential helpers can now behave
differently when they are not running interactively.

* ds/background-maintenance-with-credential:
  scalar: configure maintenance during 'reconfigure'
  maintenance: add custom config to background jobs
  credential: add new interactive config option

Documentation/config/credential.txt

@@ -9,6 +9,14 @@ credential.helper::
 Note that multiple helpers may be defined. See linkgit:gitcredentials[7]
 for details and examples.
 
+credential.interactive::
+	By default, Git and any configured credential helpers will ask for
+	user input when new credentials are required. Many of these helpers
+	will succeed based on stored credentials if those credentials are
+	still valid. To avoid the possibility of user interactivity from
+	Git, set `credential.interactive=false`. Some credential helpers
+	respect this option as well.
+
 credential.useHttpPath::
 	When acquiring credentials, consider the "path" component of an http
 	or https URL to be important. Defaults to false. See

builtin/gc.c

@@ -1768,6 +1768,42 @@ static const char *get_frequency(enum schedule_priority schedule)
 	}
 }
 
+static const char *extraconfig[] = {
+	"credential.interactive=false",
+	"core.askPass=true", /* 'true' returns success, but no output. */
+	NULL
+};
+
+static const char *get_extra_config_parameters(void) {
+	static const char *result = NULL;
+	struct strbuf builder = STRBUF_INIT;
+
+	if (result)
+		return result;
+
+	for (const char **s = extraconfig; s && *s; s++)
+		strbuf_addf(&builder, "-c %s ", *s);
+
+	result = strbuf_detach(&builder, NULL);
+	return result;
+}
+
+static const char *get_extra_launchctl_strings(void) {
+	static const char *result = NULL;
+	struct strbuf builder = STRBUF_INIT;
+
+	if (result)
+		return result;
+
+	for (const char **s = extraconfig; s && *s; s++) {
+		strbuf_addstr(&builder, "<string>-c</string>\n");
+		strbuf_addf(&builder, "<string>%s</string>\n", *s);
+	}
+
+	result = strbuf_detach(&builder, NULL);
+	return result;
+}
+
 /*
  * get_schedule_cmd` reads the GIT_TEST_MAINT_SCHEDULER environment variable
  * to mock the schedulers that `git maintenance start` rely on.
@@ -1974,6 +2010,7 @@ static int launchctl_schedule_plist(const char *exec_path, enum schedule_priorit
 		   "<array>\n"
 		   "<string>%s/git</string>\n"
 		   "<string>--exec-path=%s</string>\n"
+		   "%s" /* For extra config parameters. */
 		   "<string>for-each-repo</string>\n"
 		   "<string>--keep-going</string>\n"
 		   "<string>--config=maintenance.repo</string>\n"
@@ -1983,7 +2020,8 @@ static int launchctl_schedule_plist(const char *exec_path, enum schedule_priorit
 		   "</array>\n"
 		   "<key>StartCalendarInterval</key>\n"
 		   "<array>\n";
-	strbuf_addf(&plist, preamble, name, exec_path, exec_path, frequency);
+	strbuf_addf(&plist, preamble, name, exec_path, exec_path,
+		    get_extra_launchctl_strings(), frequency);
 
 	switch (schedule) {
 	case SCHEDULE_HOURLY:
@@ -2218,11 +2256,12 @@ static int schtasks_schedule_task(const char *exec_path, enum schedule_priority
 	      "<Actions Context=\"Author\">\n"
 	      "<Exec>\n"
 	      "<Command>\"%s\\headless-git.exe\"</Command>\n"
-	      "<Arguments>--exec-path=\"%s\" for-each-repo --keep-going --config=maintenance.repo maintenance run --schedule=%s</Arguments>\n"
+	      "<Arguments>--exec-path=\"%s\" %s for-each-repo --keep-going --config=maintenance.repo maintenance run --schedule=%s</Arguments>\n"
 	      "</Exec>\n"
 	      "</Actions>\n"
 	      "</Task>\n";
-	fprintf(tfile->fp, xml, exec_path, exec_path, frequency);
+	fprintf(tfile->fp, xml, exec_path, exec_path,
+		get_extra_config_parameters(), frequency);
 	strvec_split(&child.args, cmd);
 	strvec_pushl(&child.args, "/create", "/tn", name, "/f", "/xml",
 				  get_tempfile_path(tfile), NULL);
@@ -2363,8 +2402,8 @@ static int crontab_update_schedule(int run_maintenance, int fd)
 			"# replaced in the future by a Git command.\n\n");
 
 		strbuf_addf(&line_format,
-			    "%%d %%s * * %%s \"%s/git\" --exec-path=\"%s\" for-each-repo --keep-going --config=maintenance.repo maintenance run --schedule=%%s\n",
-			    exec_path, exec_path);
+			    "%%d %%s * * %%s \"%s/git\" --exec-path=\"%s\" %s for-each-repo --keep-going --config=maintenance.repo maintenance run --schedule=%%s\n",
+			    exec_path, exec_path, get_extra_config_parameters());
 		fprintf(cron_in, line_format.buf, minute, "1-23", "*", "hourly");
 		fprintf(cron_in, line_format.buf, minute, "0", "1-6", "daily");
 		fprintf(cron_in, line_format.buf, minute, "0", "0", "weekly");
@@ -2564,7 +2603,7 @@ static int systemd_timer_write_service_template(const char *exec_path)
 	       "\n"
 	       "[Service]\n"
 	       "Type=oneshot\n"
-	       "ExecStart=\"%s/git\" --exec-path=\"%s\" for-each-repo --keep-going --config=maintenance.repo maintenance run --schedule=%%i\n"
+	       "ExecStart=\"%s/git\" --exec-path=\"%s\" %s for-each-repo --keep-going --config=maintenance.repo maintenance run --schedule=%%i\n"
 	       "LockPersonality=yes\n"
 	       "MemoryDenyWriteExecute=yes\n"
 	       "NoNewPrivileges=yes\n"
@@ -2574,7 +2613,7 @@ static int systemd_timer_write_service_template(const char *exec_path)
 	       "RestrictSUIDSGID=yes\n"
 	       "SystemCallArchitectures=native\n"
 	       "SystemCallFilter=@system-service\n";
-	if (fprintf(file, unit, exec_path, exec_path) < 0) {
+	if (fprintf(file, unit, exec_path, exec_path, get_extra_config_parameters()) < 0) {
 		error(_("failed to write to '%s'"), filename);
 		fclose(file);
 		goto error;

credential.c

@@ -13,6 +13,8 @@
 #include "strbuf.h"
 #include "urlmatch.h"
 #include "git-compat-util.h"
+#include "trace2.h"
+#include "repository.h"
 
 void credential_init(struct credential *c)
 {
@@ -251,14 +253,36 @@ static char *credential_ask_one(const char *what, struct credential *c,
 	return xstrdup(r);
 }
 
-static void credential_getpass(struct credential *c)
+static int credential_getpass(struct credential *c)
 {
+	int interactive;
+	char *value;
+	if (!git_config_get_maybe_bool("credential.interactive", &interactive) &&
+	    !interactive) {
+		trace2_data_intmax("credential", the_repository,
+				   "interactive/skipped", 1);
+		return -1;
+	}
+	if (!git_config_get_string("credential.interactive", &value)) {
+		int same = !strcmp(value, "never");
+		free(value);
+		if (same) {
+			trace2_data_intmax("credential", the_repository,
+					   "interactive/skipped", 1);
+			return -1;
+		}
+	}
+
+	trace2_region_enter("credential", "interactive", the_repository);
 	if (!c->username)
 		c->username = credential_ask_one("Username", c,
 						 PROMPT_ASKPASS|PROMPT_ECHO);
 	if (!c->password)
 		c->password = credential_ask_one("Password", c,
 						 PROMPT_ASKPASS);
+	trace2_region_leave("credential", "interactive", the_repository);
+
+	return 0;
 }
 
 int credential_has_capability(const struct credential_capability *capa,
@@ -501,8 +525,8 @@ void credential_fill(struct credential *c, int all_capabilities)
 			    c->helpers.items[i].string);
 	}
 
-	credential_getpass(c);
-	if (!c->username && !c->password && !c->credential)
+	if (credential_getpass(c) ||
+	    (!c->username && !c->password && !c->credential))
 		die("unable to get password from user");
 }
 

scalar.c

@@ -733,6 +733,9 @@ static int cmd_reconfigure(int argc, const char **argv)
 
 		the_repository = old_repo;
 
+		if (toggle_maintenance(1) >= 0)
+			succeeded = 1;
+
 loop_end:
 		if (!succeeded) {
 			res = -1;

t/t5551-http-fetch-smart.sh

@@ -186,6 +186,28 @@ test_expect_success 'clone from password-protected repository' '
 	test_cmp expect actual
 '
 
+test_expect_success 'credential.interactive=false skips askpass' '
+	set_askpass bogus nonsense &&
+	(
+		GIT_TRACE2_EVENT="$(pwd)/interactive-true" &&
+		export GIT_TRACE2_EVENT &&
+		test_must_fail git clone --bare "$HTTPD_URL/auth/smart/repo.git" interactive-true-dir &&
+		test_region credential interactive interactive-true &&
+
+		GIT_TRACE2_EVENT="$(pwd)/interactive-false" &&
+		export GIT_TRACE2_EVENT &&
+		test_must_fail git -c credential.interactive=false \
+			clone --bare "$HTTPD_URL/auth/smart/repo.git" interactive-false-dir &&
+		test_region ! credential interactive interactive-false &&
+
+		GIT_TRACE2_EVENT="$(pwd)/interactive-never" &&
+		export GIT_TRACE2_EVENT &&
+		test_must_fail git -c credential.interactive=never \
+			clone --bare "$HTTPD_URL/auth/smart/repo.git" interactive-never-dir &&
+		test_region ! credential interactive interactive-never
+	)
+'
+
 test_expect_success 'clone from auth-only-for-push repository' '
 	echo two >expect &&
 	set_askpass wrong &&

t/t7900-maintenance.sh

@@ -825,6 +825,9 @@ test_expect_success 'start and stop Linux/systemd maintenance' '
 	test_systemd_analyze_verify "systemd/user/git-maintenance@daily.service" &&
 	test_systemd_analyze_verify "systemd/user/git-maintenance@weekly.service" &&
 
+	grep "core.askPass=true" "systemd/user/git-maintenance@.service" &&
+	grep "credential.interactive=false" "systemd/user/git-maintenance@.service" &&
+
 	printf -- "--user enable --now git-maintenance@%s.timer\n" hourly daily weekly >expect &&
 	test_cmp expect args &&
 

t/t9210-scalar.sh

@@ -194,8 +194,11 @@ test_expect_success 'scalar reconfigure' '
 	scalar reconfigure one &&
 	test true = "$(git -C one/src config core.preloadIndex)" &&
 	git -C one/src config core.preloadIndex false &&
-	scalar reconfigure -a &&
-	test true = "$(git -C one/src config core.preloadIndex)"
+	rm one/src/cron.txt &&
+	GIT_TRACE2_EVENT="$(pwd)/reconfigure" scalar reconfigure -a &&
+	test_path_is_file one/src/cron.txt &&
+	test true = "$(git -C one/src config core.preloadIndex)" &&
+	test_subcommand git maintenance start <reconfigure
 '
 
 test_expect_success 'scalar reconfigure --all with includeIf.onbranch' '