git/scalar.c

949 строки
23 KiB
C

/*
* The Scalar command-line interface.
*/
#include "git-compat-util.h"
#include "abspath.h"
#include "gettext.h"
#include "parse-options.h"
#include "config.h"
#include "run-command.h"
#include "simple-ipc.h"
#include "fsmonitor-ipc.h"
#include "fsmonitor-settings.h"
#include "refs.h"
#include "dir.h"
#include "packfile.h"
#include "help.h"
#include "setup.h"
#include "trace2.h"
static void setup_enlistment_directory(int argc, const char **argv,
const char * const *usagestr,
const struct option *options,
struct strbuf *enlistment_root)
{
struct strbuf path = STRBUF_INIT;
int enlistment_is_repo_parent = 0;
size_t len;
if (startup_info->have_repository)
BUG("gitdir already set up?!?");
if (argc > 1)
usage_with_options(usagestr, options);
/* find the worktree, determine its corresponding root */
if (argc == 1) {
strbuf_add_absolute_path(&path, argv[0]);
if (!is_directory(path.buf))
die(_("'%s' does not exist"), path.buf);
if (chdir(path.buf) < 0)
die_errno(_("could not switch to '%s'"), path.buf);
} else if (strbuf_getcwd(&path) < 0)
die(_("need a working directory"));
strbuf_trim_trailing_dir_sep(&path);
/* check if currently in enlistment root with src/ workdir */
len = path.len;
strbuf_addstr(&path, "/src");
if (is_nonbare_repository_dir(&path)) {
enlistment_is_repo_parent = 1;
if (chdir(path.buf) < 0)
die_errno(_("could not switch to '%s'"), path.buf);
}
strbuf_setlen(&path, len);
setup_git_directory();
if (!the_repository->worktree)
die(_("Scalar enlistments require a worktree"));
if (enlistment_root) {
if (enlistment_is_repo_parent)
strbuf_addbuf(enlistment_root, &path);
else
strbuf_addstr(enlistment_root, the_repository->worktree);
}
strbuf_release(&path);
}
static int run_git(const char *arg, ...)
{
struct child_process cmd = CHILD_PROCESS_INIT;
va_list args;
const char *p;
va_start(args, arg);
strvec_push(&cmd.args, arg);
while ((p = va_arg(args, const char *)))
strvec_push(&cmd.args, p);
va_end(args);
cmd.git_cmd = 1;
return run_command(&cmd);
}
struct scalar_config {
const char *key;
const char *value;
int overwrite_on_reconfigure;
};
static int set_scalar_config(const struct scalar_config *config, int reconfigure)
{
char *value = NULL;
int res;
if ((reconfigure && config->overwrite_on_reconfigure) ||
git_config_get_string(config->key, &value)) {
trace2_data_string("scalar", the_repository, config->key, "created");
res = git_config_set_gently(config->key, config->value);
} else {
trace2_data_string("scalar", the_repository, config->key, "exists");
res = 0;
}
free(value);
return res;
}
static int have_fsmonitor_support(void)
{
return fsmonitor_ipc__is_supported() &&
fsm_settings__get_reason(the_repository) == FSMONITOR_REASON_OK;
}
static int set_recommended_config(int reconfigure)
{
struct scalar_config config[] = {
/* Required */
{ "am.keepCR", "true", 1 },
{ "core.FSCache", "true", 1 },
{ "core.multiPackIndex", "true", 1 },
{ "core.preloadIndex", "true", 1 },
#ifndef WIN32
{ "core.untrackedCache", "true", 1 },
#else
/*
* Unfortunately, Scalar's Functional Tests demonstrated
* that the untracked cache feature is unreliable on Windows
* (which is a bummer because that platform would benefit the
* most from it). For some reason, freshly created files seem
* not to update the directory's `lastModified` time
* immediately, but the untracked cache would need to rely on
* that.
*
* Therefore, with a sad heart, we disable this very useful
* feature on Windows.
*/
{ "core.untrackedCache", "false", 1 },
#endif
{ "core.logAllRefUpdates", "true", 1 },
{ "credential.https://dev.azure.com.useHttpPath", "true", 1 },
{ "credential.validate", "false", 1 }, /* GCM4W-only */
{ "gc.auto", "0", 1 },
{ "gui.GCWarning", "false", 1 },
{ "index.skipHash", "false", 1 },
{ "index.threads", "true", 1 },
{ "index.version", "4", 1 },
{ "merge.stat", "false", 1 },
{ "merge.renames", "true", 1 },
{ "pack.useBitmaps", "false", 1 },
{ "pack.useSparse", "true", 1 },
{ "receive.autoGC", "false", 1 },
{ "feature.manyFiles", "false", 1 },
{ "feature.experimental", "false", 1 },
{ "fetch.unpackLimit", "1", 1 },
{ "fetch.writeCommitGraph", "false", 1 },
#ifdef WIN32
{ "http.sslBackend", "schannel", 1 },
#endif
/* Optional */
{ "status.aheadBehind", "false" },
{ "commitGraph.generationVersion", "1" },
{ "core.autoCRLF", "false" },
{ "core.safeCRLF", "false" },
{ "fetch.showForcedUpdates", "false" },
{ NULL, NULL },
};
int i;
char *value;
for (i = 0; config[i].key; i++) {
if (set_scalar_config(config + i, reconfigure))
return error(_("could not configure %s=%s"),
config[i].key, config[i].value);
}
if (have_fsmonitor_support()) {
struct scalar_config fsmonitor = { "core.fsmonitor", "true" };
if (set_scalar_config(&fsmonitor, reconfigure))
return error(_("could not configure %s=%s"),
fsmonitor.key, fsmonitor.value);
}
/*
* The `log.excludeDecoration` setting is special because it allows
* for multiple values.
*/
if (git_config_get_string("log.excludeDecoration", &value)) {
trace2_data_string("scalar", the_repository,
"log.excludeDecoration", "created");
if (git_config_set_multivar_gently("log.excludeDecoration",
"refs/prefetch/*",
CONFIG_REGEX_NONE, 0))
return error(_("could not configure "
"log.excludeDecoration"));
} else {
trace2_data_string("scalar", the_repository,
"log.excludeDecoration", "exists");
free(value);
}
return 0;
}
static int toggle_maintenance(int enable)
{
return run_git("maintenance",
enable ? "start" : "unregister",
enable ? NULL : "--force",
NULL);
}
static int add_or_remove_enlistment(int add)
{
int res;
if (!the_repository->worktree)
die(_("Scalar enlistments require a worktree"));
res = run_git("config", "--global", "--get", "--fixed-value",
"scalar.repo", the_repository->worktree, NULL);
/*
* If we want to add and the setting is already there, then do nothing.
* If we want to remove and the setting is not there, then do nothing.
*/
if ((add && !res) || (!add && res))
return 0;
return run_git("config", "--global", add ? "--add" : "--unset",
add ? "--no-fixed-value" : "--fixed-value",
"scalar.repo", the_repository->worktree, NULL);
}
static int start_fsmonitor_daemon(void)
{
assert(have_fsmonitor_support());
if (fsmonitor_ipc__get_state() != IPC_STATE__LISTENING)
return run_git("fsmonitor--daemon", "start", NULL);
return 0;
}
static int stop_fsmonitor_daemon(void)
{
assert(have_fsmonitor_support());
if (fsmonitor_ipc__get_state() == IPC_STATE__LISTENING)
return run_git("fsmonitor--daemon", "stop", NULL);
return 0;
}
static int register_dir(void)
{
if (add_or_remove_enlistment(1))
return error(_("could not add enlistment"));
if (set_recommended_config(0))
return error(_("could not set recommended config"));
if (toggle_maintenance(1))
warning(_("could not turn on maintenance"));
if (have_fsmonitor_support() && start_fsmonitor_daemon()) {
return error(_("could not start the FSMonitor daemon"));
}
return 0;
}
static int unregister_dir(void)
{
int res = 0;
if (toggle_maintenance(0))
res = error(_("could not turn off maintenance"));
if (add_or_remove_enlistment(0))
res = error(_("could not remove enlistment"));
return res;
}
/* printf-style interface, expects `<key>=<value>` argument */
static int set_config(const char *fmt, ...)
{
struct strbuf buf = STRBUF_INIT;
char *value;
int res;
va_list args;
va_start(args, fmt);
strbuf_vaddf(&buf, fmt, args);
va_end(args);
value = strchr(buf.buf, '=');
if (value)
*(value++) = '\0';
res = git_config_set_gently(buf.buf, value);
strbuf_release(&buf);
return res;
}
static char *remote_default_branch(const char *url)
{
struct child_process cp = CHILD_PROCESS_INIT;
struct strbuf out = STRBUF_INIT;
cp.git_cmd = 1;
strvec_pushl(&cp.args, "ls-remote", "--symref", url, "HEAD", NULL);
if (!pipe_command(&cp, NULL, 0, &out, 0, NULL, 0)) {
const char *line = out.buf;
while (*line) {
const char *eol = strchrnul(line, '\n'), *p;
size_t len = eol - line;
char *branch;
if (!skip_prefix(line, "ref: ", &p) ||
!strip_suffix_mem(line, &len, "\tHEAD")) {
line = eol + (*eol == '\n');
continue;
}
eol = line + len;
if (skip_prefix(p, "refs/heads/", &p)) {
branch = xstrndup(p, eol - p);
strbuf_release(&out);
return branch;
}
error(_("remote HEAD is not a branch: '%.*s'"),
(int)(eol - p), p);
strbuf_release(&out);
return NULL;
}
}
warning(_("failed to get default branch name from remote; "
"using local default"));
strbuf_reset(&out);
child_process_init(&cp);
cp.git_cmd = 1;
strvec_pushl(&cp.args, "symbolic-ref", "--short", "HEAD", NULL);
if (!pipe_command(&cp, NULL, 0, &out, 0, NULL, 0)) {
strbuf_trim(&out);
return strbuf_detach(&out, NULL);
}
strbuf_release(&out);
error(_("failed to get default branch name"));
return NULL;
}
static int delete_enlistment(struct strbuf *enlistment)
{
#ifdef WIN32
struct strbuf parent = STRBUF_INIT;
size_t offset;
char *path_sep;
#endif
if (unregister_dir())
return error(_("failed to unregister repository"));
#ifdef WIN32
/*
* Change the current directory to one outside of the enlistment so
* that we may delete everything underneath it.
*/
offset = offset_1st_component(enlistment->buf);
path_sep = find_last_dir_sep(enlistment->buf + offset);
strbuf_add(&parent, enlistment->buf,
path_sep ? path_sep - enlistment->buf : offset);
if (chdir(parent.buf) < 0) {
int res = error_errno(_("could not switch to '%s'"), parent.buf);
strbuf_release(&parent);
return res;
}
strbuf_release(&parent);
#endif
if (have_fsmonitor_support() && stop_fsmonitor_daemon())
return error(_("failed to stop the FSMonitor daemon"));
if (remove_dir_recursively(enlistment, 0))
return error(_("failed to delete enlistment directory"));
return 0;
}
/*
* Dummy implementation; Using `get_version_info()` would cause a link error
* without this.
*/
void load_builtin_commands(const char *prefix, struct cmdnames *cmds)
{
die("not implemented");
}
static int cmd_clone(int argc, const char **argv)
{
const char *branch = NULL;
int full_clone = 0, single_branch = 0, show_progress = isatty(2);
struct option clone_options[] = {
OPT_STRING('b', "branch", &branch, N_("<branch>"),
N_("branch to checkout after clone")),
OPT_BOOL(0, "full-clone", &full_clone,
N_("when cloning, create full working directory")),
OPT_BOOL(0, "single-branch", &single_branch,
N_("only download metadata for the branch that will "
"be checked out")),
OPT_END(),
};
const char * const clone_usage[] = {
N_("scalar clone [<options>] [--] <repo> [<dir>]"),
NULL
};
const char *url;
char *enlistment = NULL, *dir = NULL;
struct strbuf buf = STRBUF_INIT;
int res;
argc = parse_options(argc, argv, NULL, clone_options, clone_usage, 0);
if (argc == 2) {
url = argv[0];
enlistment = xstrdup(argv[1]);
} else if (argc == 1) {
url = argv[0];
strbuf_addstr(&buf, url);
/* Strip trailing slashes, if any */
while (buf.len > 0 && is_dir_sep(buf.buf[buf.len - 1]))
strbuf_setlen(&buf, buf.len - 1);
/* Strip suffix `.git`, if any */
strbuf_strip_suffix(&buf, ".git");
enlistment = find_last_dir_sep(buf.buf);
if (!enlistment) {
die(_("cannot deduce worktree name from '%s'"), url);
}
enlistment = xstrdup(enlistment + 1);
} else {
usage_msg_opt(_("You must specify a repository to clone."),
clone_usage, clone_options);
}
if (is_directory(enlistment))
die(_("directory '%s' exists already"), enlistment);
dir = xstrfmt("%s/src", enlistment);
strbuf_reset(&buf);
if (branch)
strbuf_addf(&buf, "init.defaultBranch=%s", branch);
else {
char *b = repo_default_branch_name(the_repository, 1);
strbuf_addf(&buf, "init.defaultBranch=%s", b);
free(b);
}
if ((res = run_git("-c", buf.buf, "init", "--", dir, NULL)))
goto cleanup;
if (chdir(dir) < 0) {
res = error_errno(_("could not switch to '%s'"), dir);
goto cleanup;
}
setup_git_directory();
/* common-main already logs `argv` */
trace2_def_repo(the_repository);
if (!branch && !(branch = remote_default_branch(url))) {
res = error(_("failed to get default branch for '%s'"), url);
goto cleanup;
}
if (set_config("remote.origin.url=%s", url) ||
set_config("remote.origin.fetch="
"+refs/heads/%s:refs/remotes/origin/%s",
single_branch ? branch : "*",
single_branch ? branch : "*") ||
set_config("remote.origin.promisor=true") ||
set_config("remote.origin.partialCloneFilter=blob:none")) {
res = error(_("could not configure remote in '%s'"), dir);
goto cleanup;
}
if (!full_clone &&
(res = run_git("sparse-checkout", "init", "--cone", NULL)))
goto cleanup;
if (set_recommended_config(0))
return error(_("could not configure '%s'"), dir);
if ((res = run_git("fetch", "--quiet",
show_progress ? "--progress" : "--no-progress",
"origin", NULL))) {
warning(_("partial clone failed; attempting full clone"));
if (set_config("remote.origin.promisor") ||
set_config("remote.origin.partialCloneFilter")) {
res = error(_("could not configure for full clone"));
goto cleanup;
}
if ((res = run_git("fetch", "--quiet",
show_progress ? "--progress" : "--no-progress",
"origin", NULL)))
goto cleanup;
}
if ((res = set_config("branch.%s.remote=origin", branch)))
goto cleanup;
if ((res = set_config("branch.%s.merge=refs/heads/%s",
branch, branch)))
goto cleanup;
strbuf_reset(&buf);
strbuf_addf(&buf, "origin/%s", branch);
res = run_git("checkout", "-f", "-t", buf.buf, NULL);
if (res)
goto cleanup;
res = register_dir();
cleanup:
free(enlistment);
free(dir);
strbuf_release(&buf);
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 diagnostics_root = STRBUF_INIT;
int res = 0;
argc = parse_options(argc, argv, NULL, options,
usage, 0);
setup_enlistment_directory(argc, argv, usage, options, &diagnostics_root);
strbuf_addstr(&diagnostics_root, "/.scalarDiagnostics");
res = run_git("diagnose", "--mode=all", "-s", "%Y%m%d_%H%M%S",
"-o", diagnostics_root.buf, NULL);
strbuf_release(&diagnostics_root);
return res;
}
static int cmd_list(int argc, const char **argv)
{
if (argc != 1)
die(_("`scalar list` does not take arguments"));
if (run_git("config", "--global", "--get-all", "scalar.repo", NULL) < 0)
return -1;
return 0;
}
static int cmd_register(int argc, const char **argv)
{
struct option options[] = {
OPT_END(),
};
const char * const usage[] = {
N_("scalar register [<enlistment>]"),
NULL
};
argc = parse_options(argc, argv, NULL, options,
usage, 0);
setup_enlistment_directory(argc, argv, usage, options, NULL);
return register_dir();
}
static int get_scalar_repos(const char *key, const char *value, void *data)
{
struct string_list *list = data;
if (!strcmp(key, "scalar.repo"))
string_list_append(list, value);
return 0;
}
static int remove_deleted_enlistment(struct strbuf *path)
{
int res = 0;
strbuf_realpath_forgiving(path, path->buf, 1);
if (run_git("config", "--global",
"--unset", "--fixed-value",
"scalar.repo", path->buf, NULL) < 0)
res = -1;
if (run_git("config", "--global",
"--unset", "--fixed-value",
"maintenance.repo", path->buf, NULL) < 0)
res = -1;
return res;
}
static int cmd_reconfigure(int argc, const char **argv)
{
int all = 0;
struct option options[] = {
OPT_BOOL('a', "all", &all,
N_("reconfigure all registered enlistments")),
OPT_END(),
};
const char * const usage[] = {
N_("scalar reconfigure [--all | <enlistment>]"),
NULL
};
struct string_list scalar_repos = STRING_LIST_INIT_DUP;
int i, res = 0;
struct repository r = { NULL };
struct strbuf commondir = STRBUF_INIT, gitdir = STRBUF_INIT;
argc = parse_options(argc, argv, NULL, options,
usage, 0);
if (!all) {
setup_enlistment_directory(argc, argv, usage, options, NULL);
return set_recommended_config(1);
}
if (argc > 0)
usage_msg_opt(_("--all or <enlistment>, but not both"),
usage, options);
git_config(get_scalar_repos, &scalar_repos);
for (i = 0; i < scalar_repos.nr; i++) {
const char *dir = scalar_repos.items[i].string;
strbuf_reset(&commondir);
strbuf_reset(&gitdir);
if (chdir(dir) < 0) {
struct strbuf buf = STRBUF_INIT;
if (errno != ENOENT) {
warning_errno(_("could not switch to '%s'"), dir);
res = -1;
continue;
}
strbuf_addstr(&buf, dir);
if (remove_deleted_enlistment(&buf))
res = error(_("could not remove stale "
"scalar.repo '%s'"), dir);
else
warning(_("removing stale scalar.repo '%s'"),
dir);
strbuf_release(&buf);
} else if (discover_git_directory(&commondir, &gitdir) < 0) {
warning_errno(_("git repository gone in '%s'"), dir);
res = -1;
} else {
git_config_clear();
the_repository = &r;
r.commondir = commondir.buf;
r.gitdir = gitdir.buf;
if (set_recommended_config(1) < 0)
res = -1;
}
}
string_list_clear(&scalar_repos, 1);
strbuf_release(&commondir);
strbuf_release(&gitdir);
return res;
}
static int cmd_run(int argc, const char **argv)
{
struct option options[] = {
OPT_END(),
};
struct {
const char *arg, *task;
} tasks[] = {
{ "config", NULL },
{ "commit-graph", "commit-graph" },
{ "fetch", "prefetch" },
{ "loose-objects", "loose-objects" },
{ "pack-files", "incremental-repack" },
{ NULL, NULL }
};
struct strbuf buf = STRBUF_INIT;
const char *usagestr[] = { NULL, NULL };
int i;
strbuf_addstr(&buf, N_("scalar run <task> [<enlistment>]\nTasks:\n"));
for (i = 0; tasks[i].arg; i++)
strbuf_addf(&buf, "\t%s\n", tasks[i].arg);
usagestr[0] = buf.buf;
argc = parse_options(argc, argv, NULL, options,
usagestr, 0);
if (!argc)
usage_with_options(usagestr, options);
if (!strcmp("all", argv[0])) {
i = -1;
} else {
for (i = 0; tasks[i].arg && strcmp(tasks[i].arg, argv[0]); i++)
; /* keep looking for the task */
if (i > 0 && !tasks[i].arg) {
error(_("no such task: '%s'"), argv[0]);
usage_with_options(usagestr, options);
}
}
argc--;
argv++;
setup_enlistment_directory(argc, argv, usagestr, options, NULL);
strbuf_release(&buf);
if (i == 0)
return register_dir();
if (i > 0)
return run_git("maintenance", "run",
"--task", tasks[i].task, NULL);
if (register_dir())
return -1;
for (i = 1; tasks[i].arg; i++)
if (run_git("maintenance", "run",
"--task", tasks[i].task, NULL))
return -1;
return 0;
}
static int cmd_unregister(int argc, const char **argv)
{
struct option options[] = {
OPT_END(),
};
const char * const usage[] = {
N_("scalar unregister [<enlistment>]"),
NULL
};
argc = parse_options(argc, argv, NULL, options,
usage, 0);
/*
* Be forgiving when the enlistment or worktree does not even exist any
* longer; This can be the case if a user deleted the worktree by
* mistake and _still_ wants to unregister the thing.
*/
if (argc == 1) {
struct strbuf src_path = STRBUF_INIT, workdir_path = STRBUF_INIT;
strbuf_addf(&src_path, "%s/src/.git", argv[0]);
strbuf_addf(&workdir_path, "%s/.git", argv[0]);
if (!is_directory(src_path.buf) && !is_directory(workdir_path.buf)) {
/* remove possible matching registrations */
int res = -1;
strbuf_strip_suffix(&src_path, "/.git");
res = remove_deleted_enlistment(&src_path) && res;
strbuf_strip_suffix(&workdir_path, "/.git");
res = remove_deleted_enlistment(&workdir_path) && res;
strbuf_release(&src_path);
strbuf_release(&workdir_path);
return res;
}
strbuf_release(&src_path);
strbuf_release(&workdir_path);
}
setup_enlistment_directory(argc, argv, usage, options, NULL);
return unregister_dir();
}
static int cmd_delete(int argc, const char **argv)
{
char *cwd = xgetcwd();
struct option options[] = {
OPT_END(),
};
const char * const usage[] = {
N_("scalar delete <enlistment>"),
NULL
};
struct strbuf enlistment = STRBUF_INIT;
int res = 0;
argc = parse_options(argc, argv, NULL, options,
usage, 0);
if (argc != 1)
usage_with_options(usage, options);
setup_enlistment_directory(argc, argv, usage, options, &enlistment);
if (dir_inside_of(cwd, enlistment.buf) >= 0)
res = error(_("refusing to delete current working directory"));
else {
close_object_store(the_repository->objects);
res = delete_enlistment(&enlistment);
}
strbuf_release(&enlistment);
free(cwd);
return res;
}
static int cmd_help(int argc, const char **argv)
{
struct option options[] = {
OPT_END(),
};
const char * const usage[] = {
"scalar help",
NULL
};
argc = parse_options(argc, argv, NULL, options,
usage, 0);
if (argc != 0)
usage_with_options(usage, options);
return run_git("help", "scalar", NULL);
}
static int cmd_version(int argc, const char **argv)
{
int verbose = 0, build_options = 0;
struct option options[] = {
OPT__VERBOSE(&verbose, N_("include Git version")),
OPT_BOOL(0, "build-options", &build_options,
N_("include Git's build options")),
OPT_END(),
};
const char * const usage[] = {
N_("scalar verbose [-v | --verbose] [--build-options]"),
NULL
};
struct strbuf buf = STRBUF_INIT;
argc = parse_options(argc, argv, NULL, options,
usage, 0);
if (argc != 0)
usage_with_options(usage, options);
get_version_info(&buf, build_options);
fprintf(stderr, "%s\n", buf.buf);
strbuf_release(&buf);
return 0;
}
static struct {
const char *name;
int (*fn)(int, const char **);
} builtins[] = {
{ "clone", cmd_clone },
{ "list", cmd_list },
{ "register", cmd_register },
{ "unregister", cmd_unregister },
{ "run", cmd_run },
{ "reconfigure", cmd_reconfigure },
{ "delete", cmd_delete },
{ "help", cmd_help },
{ "version", cmd_version },
{ "diagnose", cmd_diagnose },
{ NULL, NULL},
};
int cmd_main(int argc, const char **argv)
{
struct strbuf scalar_usage = STRBUF_INIT;
int i;
while (argc > 1 && *argv[1] == '-') {
if (!strcmp(argv[1], "-C")) {
if (argc < 3)
die(_("-C requires a <directory>"));
if (chdir(argv[2]) < 0)
die_errno(_("could not change to '%s'"),
argv[2]);
argc -= 2;
argv += 2;
} else if (!strcmp(argv[1], "-c")) {
if (argc < 3)
die(_("-c requires a <key>=<value> argument"));
git_config_push_parameter(argv[2]);
argc -= 2;
argv += 2;
} else
break;
}
if (argc > 1) {
argv++;
argc--;
for (i = 0; builtins[i].name; i++)
if (!strcmp(builtins[i].name, argv[0]))
return !!builtins[i].fn(argc, argv);
}
strbuf_addstr(&scalar_usage,
N_("scalar [-C <directory>] [-c <key>=<value>] "
"<command> [<options>]\n\nCommands:\n"));
for (i = 0; builtins[i].name; i++)
strbuf_addf(&scalar_usage, "\t%s\n", builtins[i].name);
usage(scalar_usage.buf);
}