perf config: Add '--system' and '--user' options to select which config file is used

The '--system' option means $(sysconfdir)/perfconfig and '--user' means
$HOME/.perfconfig. If none is used, both system and user config file are
read.  E.g.:

    # perf config [<file-option>] [options]

    With an specific config file:

    # perf config --user | --system

    or both user and system config file:

    # perf config

Signed-off-by: Taeung Song <treeze.taeung@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/1455126685-32367-2-git-send-email-treeze.taeung@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

4 files changed, 42 insertions, 6 deletions

diff --git a/tools/perf/Documentation/perf-config.txt b/tools/perf/Documentation/perf-config.txt
index c7158bfb1649..15949e2a7805 100644
--- a/tools/perf/Documentation/perf-config.txt
+++ b/tools/perf/Documentation/perf-config.txt
@@ -8,7 +8,7 @@ perf-config - Get and set variables in a configuration file.
 SYNOPSIS
 --------
 [verse]
-'perf config' -l | --list
+'perf config' [<file-option>] -l | --list
 
 DESCRIPTION
 -----------
@@ -21,6 +21,14 @@ OPTIONS
 --list::
         Show current config variables, name and value, for all sections.
 
+--user::
+        For writing and reading options: write to user
+        '$HOME/.perfconfig' file or read it.
+
+--system::
+        For writing and reading options: write to system-wide
+        '$(sysconfdir)/perfconfig' or read it.
+
 CONFIGURATION FILE
 ------------------
 
@@ -30,6 +38,10 @@ The '$HOME/.perfconfig' file is used to store a per-user configuration.
 The file '$(sysconfdir)/perfconfig' can be used to
 store a system-wide default configuration.
 
+When reading or writing, the values are read from the system and user
+configuration files by default, and options '--system' and '--user'
+can be used to tell the command to read from or write to only that location.
+
 Syntax
 ~~~~~~
 
diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index f04e804a9fad..c42448ed5dfe 100644
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -13,8 +13,10 @@
 #include "util/util.h"
 #include "util/debug.h"
 
+static bool use_system_config, use_user_config;
+
 static const char * const config_usage[] = {
-        "perf config [options]",
+        "perf config [<file-option>] [options]",
         NULL
 };
 
@@ -25,6 +27,8 @@ enum actions {
 static struct option config_options[] = {
         OPT_SET_UINT('l', "list", &actions,
                      "show current config variables", ACTION_LIST),
+        OPT_BOOLEAN(0, "system", &use_system_config, "use system config file"),
+        OPT_BOOLEAN(0, "user", &use_user_config, "use user config file"),
         OPT_END()
 };
 
@@ -42,10 +46,23 @@ static int show_config(const char *key, const char *value,
 int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
 {
         int ret = 0;
+        char *user_config = mkpath("%s/.perfconfig", getenv("HOME"));
 
         argc = parse_options(argc, argv, config_options, config_usage,
                              PARSE_OPT_STOP_AT_NON_OPTION);
 
+        if (use_system_config && use_user_config) {
+                pr_err("Error: only one config file at a time\n");
+                parse_options_usage(config_usage, config_options, "user", 0);
+                parse_options_usage(NULL, config_options, "system", 0);
+                return -1;
+        }
+
+        if (use_system_config)
+                config_exclusive_filename = perf_etc_perfconfig();
+        else if (use_user_config)
+                config_exclusive_filename = user_config;
+
         switch (actions) {
         case ACTION_LIST:
                 if (argc) {
@@ -53,9 +70,13 @@ int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
                         parse_options_usage(config_usage, config_options, "l", 1);
                 } else {
                         ret = perf_config(show_config, NULL);
-                        if (ret < 0)
+                        if (ret < 0) {
+                                const char * config_filename = config_exclusive_filename;
+                                if (!config_exclusive_filename)
+                                        config_filename = user_config;
                                 pr_err("Nothing configured, "
-                                       "please check your ~/.perfconfig file\n");
+                                       "please check your %s \n", config_filename);
+                        }
                 }
                 break;
         default:
diff --git a/tools/perf/util/cache.h b/tools/perf/util/cache.h
index 07b5d63947b1..3ca453f0c51f 100644
--- a/tools/perf/util/cache.h
+++ b/tools/perf/util/cache.h
@@ -23,6 +23,8 @@
 #define PERF_TRACEFS_ENVIRONMENT "PERF_TRACEFS_DIR"
 #define PERF_PAGER_ENVIRONMENT "PERF_PAGER"
 
+extern const char *config_exclusive_filename;
+
 typedef int (*config_fn_t)(const char *, const char *, void *);
 extern int perf_default_config(const char *, const char *, void *);
 extern int perf_config(config_fn_t fn, void *);
@@ -31,6 +33,7 @@ extern u64 perf_config_u64(const char *, const char *);
 extern int perf_config_bool(const char *, const char *);
 extern int config_error_nonbool(const char *);
 extern const char *perf_config_dirname(const char *, const char *);
+extern const char *perf_etc_perfconfig(void);
 
 char *alias_lookup(const char *alias);
 int split_cmdline(char *cmdline, const char ***argv);
diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c
index d3e12e30e1d5..4e727635476e 100644
--- a/tools/perf/util/config.c
+++ b/tools/perf/util/config.c
@@ -26,7 +26,7 @@ static const char *config_file_name;
 static int config_linenr;
 static int config_file_eof;
 
-static const char *config_exclusive_filename;
+const char *config_exclusive_filename;
 
 static int get_next_char(void)
 {
@@ -434,7 +434,7 @@ static int perf_config_from_file(config_fn_t fn, const char *filename, void *dat
         return ret;
 }
 
-static const char *perf_etc_perfconfig(void)
+const char *perf_etc_perfconfig(void)
 {
         static const char *system_wide;
         if (!system_wide)