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Subject[PATCH v3 5/5] perf config: Add '--system' and '--global' options to be able to select which config file to be used.
Date
Which config file is used is decided at only perf_config().
That's why a config file to be used can't be selected
among system and global config file when perf-config commands
get or set it. So add '--system' and '--global' options to select
which config file to be used when getting, setting or etc.

Signed-off-by: Taeung Song <treeze.taeung@gmail.com>
---
tools/perf/Documentation/perf-config.txt | 20 ++++++++--
tools/perf/builtin-config.c | 24 +++++++++--
tools/perf/util/cache.h | 5 ++-
tools/perf/util/config.c | 68 +++++++++++++++++++-------------
4 files changed, 80 insertions(+), 37 deletions(-)

diff --git a/tools/perf/Documentation/perf-config.txt b/tools/perf/Documentation/perf-config.txt
index a543e1b..b798112 100644
--- a/tools/perf/Documentation/perf-config.txt
+++ b/tools/perf/Documentation/perf-config.txt
@@ -8,13 +8,13 @@ perf-config - Get and set variables in a configuration file.
SYNOPSIS
--------
[verse]
-'perf config' [section.name[=value] ...]
+'perf config' [<file-option>] [section.name[=value] ...]
or
-'perf config' -l | --list
+'perf config' [<file-option>] -l | --list
or
-'perf config' -a | --list-all
+'perf config' [<file-option>] -a | --list-all
or
-'perf config' -r | --remove [section.name ...]
+'perf config' [<file-option>] -r | --remove [section.name ...]

DESCRIPTION
-----------
@@ -35,6 +35,14 @@ OPTIONS
--remove::
Remove specific config variables.

+--global::
+ For writing and reading options: write to global
+ '$HOME/.perfconfig' file or read it.
+
+--system::
+ For writing and reading options: write to system-wide
+ '$(sysconfdir)/perfconfig' or read it.
+
CONFIGURATION FILE
------------------

@@ -47,6 +55,10 @@ store a system-wide default configuration.
The variables are divided into sections. In each section, the variables
can are composed of a key and value.

+When reading or writing, the values are read from the system and global
+configuration files by default, and options '--system' and '--global'
+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 857e121..d8fa566 100644
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -14,6 +14,8 @@
#include "util/debug.h"

static int actions;
+static bool use_system_config, use_global_config;
+static const char *config_file_name;

static const char * const config_usage[] = {
"perf config [options] [section.name[=value] ...]",
@@ -25,6 +27,9 @@ static const char * const config_usage[] = {
#define ACTION_REMOVE (1<<2)

static const struct option config_options[] = {
+ OPT_GROUP("Config file location"),
+ OPT_BOOLEAN(0, "system", &use_system_config, "use system config file"),
+ OPT_BOOLEAN(0, "global", &use_global_config, "use global config file"),
OPT_GROUP("Action"),
OPT_BIT('l', "list", &actions, "show current config variables", ACTION_LIST),
OPT_BIT('a', "list-all", &actions,
@@ -508,7 +513,7 @@ static int set_config(const char *section_name, const char *name, char *value)
}
}

- return perf_configset_write_in_full();
+ return perf_configset_write_in_full(config_file_name);
}

static int collect_current_config(const char *var, const char *value,
@@ -635,13 +640,24 @@ int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
else
has_option = false;

+ if (use_system_config && use_global_config) {
+ pr_err("Error: only one config file at a time.");
+ usage_with_options(config_usage, config_options);
+ return -1;
+ } else if (use_global_config || (!use_system_config && !use_global_config)) {
+ config_file_name = perf_user_perfconfig(getenv("HOME"));
+ if (!config_file_name)
+ return -1;
+ } else if (use_system_config)
+ config_file_name = perf_etc_perfconfig();
+
INIT_LIST_HEAD(&sections);
- perf_config(collect_current_config, NULL);
+ perf_config_from_file(collect_current_config, config_file_name, NULL);

switch (actions) {
case ACTION_LIST:
if (argc == 0)
- ret = perf_config(show_config, NULL);
+ ret = perf_config_from_file(show_config, config_file_name, NULL);
else
goto out_err;
goto out;
@@ -665,7 +681,7 @@ int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
goto out;
default:
if (!has_option && argc == 0) {
- ret = perf_config(show_config, NULL);
+ ret = perf_config_from_file(show_config, config_file_name, NULL);
goto out;
} else if (argc > 0) {
for (i = 0; argv[i]; i++) {
diff --git a/tools/perf/util/cache.h b/tools/perf/util/cache.h
index 36d7839..079a3846 100644
--- a/tools/perf/util/cache.h
+++ b/tools/perf/util/cache.h
@@ -35,15 +35,18 @@ struct config_section {
struct list_head sections;

typedef int (*configset_fn_t)(const char *, const char *, char*);
-extern int perf_configset_write_in_full(void);
+extern int perf_configset_write_in_full(const char *file_name);
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 *);
+extern int perf_config_from_file(config_fn_t fn, const char *filename, void *data);
extern int perf_config_int(const char *, const char *);
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);
+extern const char *perf_user_perfconfig(const char *home);

/* pager.c */
extern void setup_pager(void);
diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c
index b6c0d2c..333c2ee 100644
--- a/tools/perf/util/config.c
+++ b/tools/perf/util/config.c
@@ -21,7 +21,7 @@
char buildid_dir[MAXPATHLEN]; /* root dir for buildid, binary cache */

static FILE *config_file;
-static char *config_file_name;
+static const char *config_file_name;
static int config_linenr;
static int config_file_eof;

@@ -412,7 +412,7 @@ int perf_default_config(const char *var, const char *value,
return 0;
}

-static int perf_config_from_file(config_fn_t fn, const char *filename, void *data)
+int perf_config_from_file(config_fn_t fn, const char *filename, void *data)
{
int ret;
FILE *f = fopen(filename, "r");
@@ -420,16 +420,48 @@ static int perf_config_from_file(config_fn_t fn, const char *filename, void *dat
ret = -1;
if (f) {
config_file = f;
- config_file_name = strdup(filename);
+ config_file_name = filename;
config_linenr = 1;
config_file_eof = 0;
ret = perf_parse_file(fn, data);
fclose(f);
+ config_file_name = NULL;
}
return ret;
}

-static const char *perf_etc_perfconfig(void)
+const char *perf_user_perfconfig(const char *home)
+{
+ char *user_config = strdup(mkpath("%s/.perfconfig", home));
+ struct stat st;
+
+ if (user_config == NULL) {
+ warning("Not enough memory to process %s/.perfconfig, "
+ "ignoring it.", home);
+ goto out;
+ }
+
+ if (stat(user_config, &st) < 0)
+ goto out_free;
+
+ if (st.st_uid && (st.st_uid != geteuid())) {
+ warning("File %s not owned by current user or root, "
+ "ignoring it.", user_config);
+ goto out_free;
+ }
+
+ if (!st.st_size)
+ goto out_free;
+
+ return user_config;
+
+out_free:
+ free(user_config);
+out:
+ return NULL;
+}
+
+const char *perf_etc_perfconfig(void)
{
static const char *system_wide;
if (!system_wide)
@@ -469,31 +501,11 @@ int perf_config(config_fn_t fn, void *data)

home = getenv("HOME");
if (perf_config_global() && home) {
- char *user_config = strdup(mkpath("%s/.perfconfig", home));
- struct stat st;
-
- if (user_config == NULL) {
- warning("Not enough memory to process %s/.perfconfig, "
- "ignoring it.", home);
+ const char *user_config = perf_user_perfconfig(home);
+ if (user_config == NULL)
goto out;
- }
-
- if (stat(user_config, &st) < 0)
- goto out_free;
-
- if (st.st_uid && (st.st_uid != geteuid())) {
- warning("File %s not owned by current user or root, "
- "ignoring it.", user_config);
- goto out_free;
- }
-
- if (!st.st_size)
- goto out_free;
-
ret += perf_config_from_file(fn, user_config, data);
found += 1;
-out_free:
- free(user_config);
}
out:
if (found == 0)
@@ -501,12 +513,12 @@ out:
return ret;
}

-int perf_configset_write_in_full(void)
+int perf_configset_write_in_full(const char *file_name)
{
struct config_section *section_node;
struct config_element *element_node;
const char *first_line = "# this file is auto-generated.";
- FILE *fp = fopen(config_file_name, "w");
+ FILE *fp = fopen(file_name, "w");

if (!fp)
return -1;
--
1.9.1


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