498 lines
12 KiB
C
498 lines
12 KiB
C
|
/*
|
||
|
|
* builtin-help.c
|
||
|
|
*
|
||
|
|
* Builtin help command
|
||
|
|
*/
|
||
|
|
#include "perf.h"
|
||
|
|
#include "util/config.h"
|
||
|
|
#include "builtin.h"
|
||
|
|
#include <subcmd/exec-cmd.h>
|
||
|
|
#include "common-cmds.h"
|
||
|
|
#include <subcmd/parse-options.h>
|
||
|
|
#include <subcmd/run-command.h>
|
||
|
|
#include <subcmd/help.h>
|
||
|
|
#include "util/debug.h"
|
||
|
|
|
||
|
|
static struct man_viewer_list {
|
||
|
|
struct man_viewer_list *next;
|
||
|
|
char name[FLEX_ARRAY];
|
||
|
|
} *man_viewer_list;
|
||
|
|
|
||
|
|
static struct man_viewer_info_list {
|
||
|
|
struct man_viewer_info_list *next;
|
||
|
|
const char *info;
|
||
|
|
char name[FLEX_ARRAY];
|
||
|
|
} *man_viewer_info_list;
|
||
|
|
|
||
|
|
enum help_format {
|
||
|
|
HELP_FORMAT_NONE,
|
||
|
|
HELP_FORMAT_MAN,
|
||
|
|
HELP_FORMAT_INFO,
|
||
|
|
HELP_FORMAT_WEB,
|
||
|
|
};
|
||
|
|
|
||
|
|
static enum help_format parse_help_format(const char *format)
|
||
|
|
{
|
||
|
|
if (!strcmp(format, "man"))
|
||
|
|
return HELP_FORMAT_MAN;
|
||
|
|
if (!strcmp(format, "info"))
|
||
|
|
return HELP_FORMAT_INFO;
|
||
|
|
if (!strcmp(format, "web") || !strcmp(format, "html"))
|
||
|
|
return HELP_FORMAT_WEB;
|
||
|
|
|
||
|
|
pr_err("unrecognized help format '%s'", format);
|
||
|
|
return HELP_FORMAT_NONE;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const char *get_man_viewer_info(const char *name)
|
||
|
|
{
|
||
|
|
struct man_viewer_info_list *viewer;
|
||
|
|
|
||
|
|
for (viewer = man_viewer_info_list; viewer; viewer = viewer->next) {
|
||
|
|
if (!strcasecmp(name, viewer->name))
|
||
|
|
return viewer->info;
|
||
|
|
}
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int check_emacsclient_version(void)
|
||
|
|
{
|
||
|
|
struct strbuf buffer = STRBUF_INIT;
|
||
|
|
struct child_process ec_process;
|
||
|
|
const char *argv_ec[] = { "emacsclient", "--version", NULL };
|
||
|
|
int version;
|
||
|
|
int ret = -1;
|
||
|
|
|
||
|
|
/* emacsclient prints its version number on stderr */
|
||
|
|
memset(&ec_process, 0, sizeof(ec_process));
|
||
|
|
ec_process.argv = argv_ec;
|
||
|
|
ec_process.err = -1;
|
||
|
|
ec_process.stdout_to_stderr = 1;
|
||
|
|
if (start_command(&ec_process)) {
|
||
|
|
fprintf(stderr, "Failed to start emacsclient.\n");
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
if (strbuf_read(&buffer, ec_process.err, 20) < 0) {
|
||
|
|
fprintf(stderr, "Failed to read emacsclient version\n");
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
close(ec_process.err);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Don't bother checking return value, because "emacsclient --version"
|
||
|
|
* seems to always exits with code 1.
|
||
|
|
*/
|
||
|
|
finish_command(&ec_process);
|
||
|
|
|
||
|
|
if (prefixcmp(buffer.buf, "emacsclient")) {
|
||
|
|
fprintf(stderr, "Failed to parse emacsclient version.\n");
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
version = atoi(buffer.buf + strlen("emacsclient"));
|
||
|
|
|
||
|
|
if (version < 22) {
|
||
|
|
fprintf(stderr,
|
||
|
|
"emacsclient version '%d' too old (< 22).\n",
|
||
|
|
version);
|
||
|
|
} else
|
||
|
|
ret = 0;
|
||
|
|
out:
|
||
|
|
strbuf_release(&buffer);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void exec_woman_emacs(const char *path, const char *page)
|
||
|
|
{
|
||
|
|
char sbuf[STRERR_BUFSIZE];
|
||
|
|
|
||
|
|
if (!check_emacsclient_version()) {
|
||
|
|
/* This works only with emacsclient version >= 22. */
|
||
|
|
char *man_page;
|
||
|
|
|
||
|
|
if (!path)
|
||
|
|
path = "emacsclient";
|
||
|
|
if (asprintf(&man_page, "(woman \"%s\")", page) > 0) {
|
||
|
|
execlp(path, "emacsclient", "-e", man_page, NULL);
|
||
|
|
free(man_page);
|
||
|
|
}
|
||
|
|
warning("failed to exec '%s': %s", path,
|
||
|
|
str_error_r(errno, sbuf, sizeof(sbuf)));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void exec_man_konqueror(const char *path, const char *page)
|
||
|
|
{
|
||
|
|
const char *display = getenv("DISPLAY");
|
||
|
|
|
||
|
|
if (display && *display) {
|
||
|
|
char *man_page;
|
||
|
|
const char *filename = "kfmclient";
|
||
|
|
char sbuf[STRERR_BUFSIZE];
|
||
|
|
|
||
|
|
/* It's simpler to launch konqueror using kfmclient. */
|
||
|
|
if (path) {
|
||
|
|
const char *file = strrchr(path, '/');
|
||
|
|
if (file && !strcmp(file + 1, "konqueror")) {
|
||
|
|
char *new = strdup(path);
|
||
|
|
char *dest = strrchr(new, '/');
|
||
|
|
|
||
|
|
/* strlen("konqueror") == strlen("kfmclient") */
|
||
|
|
strcpy(dest + 1, "kfmclient");
|
||
|
|
path = new;
|
||
|
|
}
|
||
|
|
if (file)
|
||
|
|
filename = file;
|
||
|
|
} else
|
||
|
|
path = "kfmclient";
|
||
|
|
if (asprintf(&man_page, "man:%s(1)", page) > 0) {
|
||
|
|
execlp(path, filename, "newTab", man_page, NULL);
|
||
|
|
free(man_page);
|
||
|
|
}
|
||
|
|
warning("failed to exec '%s': %s", path,
|
||
|
|
str_error_r(errno, sbuf, sizeof(sbuf)));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void exec_man_man(const char *path, const char *page)
|
||
|
|
{
|
||
|
|
char sbuf[STRERR_BUFSIZE];
|
||
|
|
|
||
|
|
if (!path)
|
||
|
|
path = "man";
|
||
|
|
execlp(path, "man", page, NULL);
|
||
|
|
warning("failed to exec '%s': %s", path,
|
||
|
|
str_error_r(errno, sbuf, sizeof(sbuf)));
|
||
|
|
}
|
||
|
|
|
||
|
|
static void exec_man_cmd(const char *cmd, const char *page)
|
||
|
|
{
|
||
|
|
char sbuf[STRERR_BUFSIZE];
|
||
|
|
char *shell_cmd;
|
||
|
|
|
||
|
|
if (asprintf(&shell_cmd, "%s %s", cmd, page) > 0) {
|
||
|
|
execl("/bin/sh", "sh", "-c", shell_cmd, NULL);
|
||
|
|
free(shell_cmd);
|
||
|
|
}
|
||
|
|
warning("failed to exec '%s': %s", cmd,
|
||
|
|
str_error_r(errno, sbuf, sizeof(sbuf)));
|
||
|
|
}
|
||
|
|
|
||
|
|
static void add_man_viewer(const char *name)
|
||
|
|
{
|
||
|
|
struct man_viewer_list **p = &man_viewer_list;
|
||
|
|
size_t len = strlen(name);
|
||
|
|
|
||
|
|
while (*p)
|
||
|
|
p = &((*p)->next);
|
||
|
|
*p = zalloc(sizeof(**p) + len + 1);
|
||
|
|
strcpy((*p)->name, name);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int supported_man_viewer(const char *name, size_t len)
|
||
|
|
{
|
||
|
|
return (!strncasecmp("man", name, len) ||
|
||
|
|
!strncasecmp("woman", name, len) ||
|
||
|
|
!strncasecmp("konqueror", name, len));
|
||
|
|
}
|
||
|
|
|
||
|
|
static void do_add_man_viewer_info(const char *name,
|
||
|
|
size_t len,
|
||
|
|
const char *value)
|
||
|
|
{
|
||
|
|
struct man_viewer_info_list *new = zalloc(sizeof(*new) + len + 1);
|
||
|
|
|
||
|
|
strncpy(new->name, name, len);
|
||
|
|
new->info = strdup(value);
|
||
|
|
new->next = man_viewer_info_list;
|
||
|
|
man_viewer_info_list = new;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int add_man_viewer_path(const char *name,
|
||
|
|
size_t len,
|
||
|
|
const char *value)
|
||
|
|
{
|
||
|
|
if (supported_man_viewer(name, len))
|
||
|
|
do_add_man_viewer_info(name, len, value);
|
||
|
|
else
|
||
|
|
warning("'%s': path for unsupported man viewer.\n"
|
||
|
|
"Please consider using 'man.<tool>.cmd' instead.",
|
||
|
|
name);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int add_man_viewer_cmd(const char *name,
|
||
|
|
size_t len,
|
||
|
|
const char *value)
|
||
|
|
{
|
||
|
|
if (supported_man_viewer(name, len))
|
||
|
|
warning("'%s': cmd for supported man viewer.\n"
|
||
|
|
"Please consider using 'man.<tool>.path' instead.",
|
||
|
|
name);
|
||
|
|
else
|
||
|
|
do_add_man_viewer_info(name, len, value);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int add_man_viewer_info(const char *var, const char *value)
|
||
|
|
{
|
||
|
|
const char *name = var + 4;
|
||
|
|
const char *subkey = strrchr(name, '.');
|
||
|
|
|
||
|
|
if (!subkey)
|
||
|
|
return error("Config with no key for man viewer: %s", name);
|
||
|
|
|
||
|
|
if (!strcmp(subkey, ".path")) {
|
||
|
|
if (!value)
|
||
|
|
return config_error_nonbool(var);
|
||
|
|
return add_man_viewer_path(name, subkey - name, value);
|
||
|
|
}
|
||
|
|
if (!strcmp(subkey, ".cmd")) {
|
||
|
|
if (!value)
|
||
|
|
return config_error_nonbool(var);
|
||
|
|
return add_man_viewer_cmd(name, subkey - name, value);
|
||
|
|
}
|
||
|
|
|
||
|
|
warning("'%s': unsupported man viewer sub key.", subkey);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int perf_help_config(const char *var, const char *value, void *cb)
|
||
|
|
{
|
||
|
|
enum help_format *help_formatp = cb;
|
||
|
|
|
||
|
|
if (!strcmp(var, "help.format")) {
|
||
|
|
if (!value)
|
||
|
|
return config_error_nonbool(var);
|
||
|
|
*help_formatp = parse_help_format(value);
|
||
|
|
if (*help_formatp == HELP_FORMAT_NONE)
|
||
|
|
return -1;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
if (!strcmp(var, "man.viewer")) {
|
||
|
|
if (!value)
|
||
|
|
return config_error_nonbool(var);
|
||
|
|
add_man_viewer(value);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
if (!prefixcmp(var, "man."))
|
||
|
|
return add_man_viewer_info(var, value);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct cmdnames main_cmds, other_cmds;
|
||
|
|
|
||
|
|
void list_common_cmds_help(void)
|
||
|
|
{
|
||
|
|
unsigned int i, longest = 0;
|
||
|
|
|
||
|
|
for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
|
||
|
|
if (longest < strlen(common_cmds[i].name))
|
||
|
|
longest = strlen(common_cmds[i].name);
|
||
|
|
}
|
||
|
|
|
||
|
|
puts(" The most commonly used perf commands are:");
|
||
|
|
for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
|
||
|
|
printf(" %-*s ", longest, common_cmds[i].name);
|
||
|
|
puts(common_cmds[i].help);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static int is_perf_command(const char *s)
|
||
|
|
{
|
||
|
|
return is_in_cmdlist(&main_cmds, s) ||
|
||
|
|
is_in_cmdlist(&other_cmds, s);
|
||
|
|
}
|
||
|
|
|
||
|
|
static const char *cmd_to_page(const char *perf_cmd)
|
||
|
|
{
|
||
|
|
char *s;
|
||
|
|
|
||
|
|
if (!perf_cmd)
|
||
|
|
return "perf";
|
||
|
|
else if (!prefixcmp(perf_cmd, "perf"))
|
||
|
|
return perf_cmd;
|
||
|
|
|
||
|
|
return asprintf(&s, "perf-%s", perf_cmd) < 0 ? NULL : s;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void setup_man_path(void)
|
||
|
|
{
|
||
|
|
char *new_path;
|
||
|
|
const char *old_path = getenv("MANPATH");
|
||
|
|
|
||
|
|
/* We should always put ':' after our path. If there is no
|
||
|
|
* old_path, the ':' at the end will let 'man' to try
|
||
|
|
* system-wide paths after ours to find the manual page. If
|
||
|
|
* there is old_path, we need ':' as delimiter. */
|
||
|
|
if (asprintf(&new_path, "%s:%s", system_path(PERF_MAN_PATH), old_path ?: "") > 0) {
|
||
|
|
setenv("MANPATH", new_path, 1);
|
||
|
|
free(new_path);
|
||
|
|
} else {
|
||
|
|
error("Unable to setup man path");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void exec_viewer(const char *name, const char *page)
|
||
|
|
{
|
||
|
|
const char *info = get_man_viewer_info(name);
|
||
|
|
|
||
|
|
if (!strcasecmp(name, "man"))
|
||
|
|
exec_man_man(info, page);
|
||
|
|
else if (!strcasecmp(name, "woman"))
|
||
|
|
exec_woman_emacs(info, page);
|
||
|
|
else if (!strcasecmp(name, "konqueror"))
|
||
|
|
exec_man_konqueror(info, page);
|
||
|
|
else if (info)
|
||
|
|
exec_man_cmd(info, page);
|
||
|
|
else
|
||
|
|
warning("'%s': unknown man viewer.", name);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int show_man_page(const char *perf_cmd)
|
||
|
|
{
|
||
|
|
struct man_viewer_list *viewer;
|
||
|
|
const char *page = cmd_to_page(perf_cmd);
|
||
|
|
const char *fallback = getenv("PERF_MAN_VIEWER");
|
||
|
|
|
||
|
|
setup_man_path();
|
||
|
|
for (viewer = man_viewer_list; viewer; viewer = viewer->next)
|
||
|
|
exec_viewer(viewer->name, page); /* will return when unable */
|
||
|
|
|
||
|
|
if (fallback)
|
||
|
|
exec_viewer(fallback, page);
|
||
|
|
exec_viewer("man", page);
|
||
|
|
|
||
|
|
pr_err("no man viewer handled the request");
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int show_info_page(const char *perf_cmd)
|
||
|
|
{
|
||
|
|
const char *page = cmd_to_page(perf_cmd);
|
||
|
|
setenv("INFOPATH", system_path(PERF_INFO_PATH), 1);
|
||
|
|
execlp("info", "info", "perfman", page, NULL);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int get_html_page_path(char **page_path, const char *page)
|
||
|
|
{
|
||
|
|
struct stat st;
|
||
|
|
const char *html_path = system_path(PERF_HTML_PATH);
|
||
|
|
|
||
|
|
/* Check that we have a perf documentation directory. */
|
||
|
|
if (stat(mkpath("%s/perf.html", html_path), &st)
|
||
|
|
|| !S_ISREG(st.st_mode)) {
|
||
|
|
pr_err("'%s': not a documentation directory.", html_path);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
return asprintf(page_path, "%s/%s.html", html_path, page);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* If open_html is not defined in a platform-specific way (see for
|
||
|
|
* example compat/mingw.h), we use the script web--browse to display
|
||
|
|
* HTML.
|
||
|
|
*/
|
||
|
|
#ifndef open_html
|
||
|
|
static void open_html(const char *path)
|
||
|
|
{
|
||
|
|
execl_cmd("web--browse", "-c", "help.browser", path, NULL);
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
static int show_html_page(const char *perf_cmd)
|
||
|
|
{
|
||
|
|
const char *page = cmd_to_page(perf_cmd);
|
||
|
|
char *page_path; /* it leaks but we exec bellow */
|
||
|
|
|
||
|
|
if (get_html_page_path(&page_path, page) < 0)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
open_html(page_path);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int cmd_help(int argc, const char **argv, const char *prefix __maybe_unused)
|
||
|
|
{
|
||
|
|
bool show_all = false;
|
||
|
|
enum help_format help_format = HELP_FORMAT_MAN;
|
||
|
|
struct option builtin_help_options[] = {
|
||
|
|
OPT_BOOLEAN('a', "all", &show_all, "print all available commands"),
|
||
|
|
OPT_SET_UINT('m', "man", &help_format, "show man page", HELP_FORMAT_MAN),
|
||
|
|
OPT_SET_UINT('w', "web", &help_format, "show manual in web browser",
|
||
|
|
HELP_FORMAT_WEB),
|
||
|
|
OPT_SET_UINT('i', "info", &help_format, "show info page",
|
||
|
|
HELP_FORMAT_INFO),
|
||
|
|
OPT_END(),
|
||
|
|
};
|
||
|
|
const char * const builtin_help_subcommands[] = {
|
||
|
|
"buildid-cache", "buildid-list", "diff", "evlist", "help", "list",
|
||
|
|
"record", "report", "bench", "stat", "timechart", "top", "annotate",
|
||
|
|
"script", "sched", "kmem", "lock", "kvm", "test", "inject", "mem", "data",
|
||
|
|
#ifdef HAVE_LIBELF_SUPPORT
|
||
|
|
"probe",
|
||
|
|
#endif
|
||
|
|
#ifdef HAVE_LIBAUDIT_SUPPORT
|
||
|
|
"trace",
|
||
|
|
#endif
|
||
|
|
NULL };
|
||
|
|
const char *builtin_help_usage[] = {
|
||
|
|
"perf help [--all] [--man|--web|--info] [command]",
|
||
|
|
NULL
|
||
|
|
};
|
||
|
|
const char *alias;
|
||
|
|
int rc = 0;
|
||
|
|
|
||
|
|
load_command_list("perf-", &main_cmds, &other_cmds);
|
||
|
|
|
||
|
|
perf_config(perf_help_config, &help_format);
|
||
|
|
|
||
|
|
argc = parse_options_subcommand(argc, argv, builtin_help_options,
|
||
|
|
builtin_help_subcommands, builtin_help_usage, 0);
|
||
|
|
|
||
|
|
if (show_all) {
|
||
|
|
printf("\n Usage: %s\n\n", perf_usage_string);
|
||
|
|
list_commands("perf commands", &main_cmds, &other_cmds);
|
||
|
|
printf(" %s\n\n", perf_more_info_string);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!argv[0]) {
|
||
|
|
printf("\n usage: %s\n\n", perf_usage_string);
|
||
|
|
list_common_cmds_help();
|
||
|
|
printf("\n %s\n\n", perf_more_info_string);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
alias = alias_lookup(argv[0]);
|
||
|
|
if (alias && !is_perf_command(argv[0])) {
|
||
|
|
printf("`perf %s' is aliased to `%s'\n", argv[0], alias);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
switch (help_format) {
|
||
|
|
case HELP_FORMAT_MAN:
|
||
|
|
rc = show_man_page(argv[0]);
|
||
|
|
break;
|
||
|
|
case HELP_FORMAT_INFO:
|
||
|
|
rc = show_info_page(argv[0]);
|
||
|
|
break;
|
||
|
|
case HELP_FORMAT_WEB:
|
||
|
|
rc = show_html_page(argv[0]);
|
||
|
|
break;
|
||
|
|
case HELP_FORMAT_NONE:
|
||
|
|
/* fall-through */
|
||
|
|
default:
|
||
|
|
rc = -1;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return rc;
|
||
|
|
}
|