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config.c: create config_reader and the_reader

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Create "struct config_reader" to hold the state of the config source
currently being read. Then, create a static instance of it,
"the_reader", and use "the_reader.source" to replace references to
"cf_global" in public functions.

This doesn't create much immediate benefit (since we're mostly replacing
static variables with a bigger static variable), but it prepares us for
a future where this state doesn't have to be global; "struct
config_reader" (or a similar struct) could be provided by the caller, or
constructed internally by a function like "do_config_from()".

A more typical approach would be to put this struct on "the_repository",
but that's a worse fit for this use case since config reading is not
scoped to a repository. E.g. we can read config before the repository is
known ("read_very_early_config()"), blatantly ignore the repo
("read_protected_config()"), or read only from a file
("git_config_from_file()"). This is especially evident in t5318 and
t9210, where test-tool and scalar parse config but don't fully
initialize "the_repository".

We could have also replaced the references to "cf_global" in callback
functions (which are the only ones left), but we'll eventually plumb
"the_reader" through the callback "*data" arg, so that would be
unnecessary churn. Until we remove "cf_global" altogether, add logic to
"config_reader_*_source()" to keep "cf_global" and "the_reader.source"
in sync.

Signed-off-by: Glen Choo <chooglen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Glen Choo 2023-03-28 17:51:49 +00:00 committed by Junio C Hamano
parent c009bc898b
commit 0c60285147
1 changed files with 51 additions and 31 deletions
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82
config.c
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@ -51,6 +51,16 @@ struct config_source {
};
#define CONFIG_SOURCE_INIT { 0 }
struct config_reader {
struct config_source *source;
};
/*
* Where possible, prefer to accept "struct config_reader" as an arg than to use
* "the_reader". "the_reader" should only be used if that is infeasible, e.g. in
* a public function.
*/
static struct config_reader the_reader;
/*
* These variables record the "current" config source, which
* can be accessed by parsing callbacks.
@ -66,6 +76,9 @@ struct config_source {
* at the variables, it's either a bug for it to be called in the first place,
* or it's a function which can be reused for non-config purposes, and should
* fall back to some sane behavior).
*
* FIXME "cf_global" has been replaced by "the_reader.source", remove
* "cf_global" once we plumb "the_reader" through all of the callback functions.
*/
static struct config_source *cf_global;
static struct key_value_info *current_config_kvi;
@ -80,19 +93,24 @@ static struct key_value_info *current_config_kvi;
*/
static enum config_scope current_parsing_scope;
static inline void config_reader_push_source(struct config_source *top)
static inline void config_reader_push_source(struct config_reader *reader,
struct config_source *top)
{
top->prev = cf_global;
cf_global = top;
top->prev = reader->source;
reader->source = top;
/* FIXME remove this when cf_global is removed. */
cf_global = reader->source;
}
static inline struct config_source *config_reader_pop_source()
static inline struct config_source *config_reader_pop_source(struct config_reader *reader)
{
struct config_source *ret;
if (!cf_global)
if (!reader->source)
BUG("tried to pop config source, but we weren't reading config");
ret = cf_global;
cf_global = cf_global->prev;
ret = reader->source;
reader->source = reader->source->prev;
/* FIXME remove this when cf_global is removed. */
cf_global = reader->source;
return ret;
}
@ -732,7 +750,7 @@ int git_config_from_parameters(config_fn_t fn, void *data)
struct config_source source = CONFIG_SOURCE_INIT;
source.origin_type = CONFIG_ORIGIN_CMDLINE;
config_reader_push_source(&source);
config_reader_push_source(&the_reader, &source);
env = getenv(CONFIG_COUNT_ENVIRONMENT);
if (env) {
@ -790,7 +808,7 @@ out:
strbuf_release(&envvar);
strvec_clear(&to_free);
free(envw);
config_reader_pop_source();
config_reader_pop_source(&the_reader);
return ret;
}
@ -1325,7 +1343,7 @@ int git_config_int(const char *name, const char *value)
{
int ret;
if (!git_parse_int(value, &ret))
die_bad_number(cf_global, name, value);
die_bad_number(the_reader.source, name, value);
return ret;
}
@ -1333,7 +1351,7 @@ int64_t git_config_int64(const char *name, const char *value)
{
int64_t ret;
if (!git_parse_int64(value, &ret))
die_bad_number(cf_global, name, value);
die_bad_number(the_reader.source, name, value);
return ret;
}
@ -1341,7 +1359,7 @@ unsigned long git_config_ulong(const char *name, const char *value)
{
unsigned long ret;
if (!git_parse_ulong(value, &ret))
die_bad_number(cf_global, name, value);
die_bad_number(the_reader.source, name, value);
return ret;
}
@ -1349,7 +1367,7 @@ ssize_t git_config_ssize_t(const char *name, const char *value)
{
ssize_t ret;
if (!git_parse_ssize_t(value, &ret))
die_bad_number(cf_global, name, value);
die_bad_number(the_reader.source, name, value);
return ret;
}
@ -1955,7 +1973,8 @@ int git_default_config(const char *var, const char *value, void *cb)
* fgetc, ungetc, ftell of top need to be initialized before calling
* this function.
*/
static int do_config_from(struct config_source *top, config_fn_t fn, void *data,
static int do_config_from(struct config_reader *reader,
struct config_source *top, config_fn_t fn, void *data,
const struct config_options *opts)
{
int ret;
@ -1966,22 +1985,23 @@ static int do_config_from(struct config_source *top, config_fn_t fn, void *data,
top->total_len = 0;
strbuf_init(&top->value, 1024);
strbuf_init(&top->var, 1024);
config_reader_push_source(top);
config_reader_push_source(reader, top);
ret = git_parse_source(top, fn, data, opts);
/* pop config-file parsing state stack */
strbuf_release(&top->value);
strbuf_release(&top->var);
config_reader_pop_source();
config_reader_pop_source(reader);
return ret;
}
static int do_config_from_file(config_fn_t fn,
const enum config_origin_type origin_type,
const char *name, const char *path, FILE *f,
void *data, const struct config_options *opts)
static int do_config_from_file(struct config_reader *reader,
config_fn_t fn,
const enum config_origin_type origin_type,
const char *name, const char *path, FILE *f,
void *data, const struct config_options *opts)
{
struct config_source top = CONFIG_SOURCE_INIT;
int ret;
@ -1996,15 +2016,15 @@ static int do_config_from_file(config_fn_t fn,
top.do_ftell = config_file_ftell;
flockfile(f);
ret = do_config_from(&top, fn, data, opts);
ret = do_config_from(reader, &top, fn, data, opts);
funlockfile(f);
return ret;
}
static int git_config_from_stdin(config_fn_t fn, void *data)
{
return do_config_from_file(fn, CONFIG_ORIGIN_STDIN, "", NULL, stdin,
data, NULL);
return do_config_from_file(&the_reader, fn, CONFIG_ORIGIN_STDIN, "",
NULL, stdin, data, NULL);
}
int git_config_from_file_with_options(config_fn_t fn, const char *filename,
@ -2018,8 +2038,8 @@ int git_config_from_file_with_options(config_fn_t fn, const char *filename,
BUG("filename cannot be NULL");
f = fopen_or_warn(filename, "r");
if (f) {
ret = do_config_from_file(fn, CONFIG_ORIGIN_FILE, filename,
filename, f, data, opts);
ret = do_config_from_file(&the_reader, fn, CONFIG_ORIGIN_FILE,
filename, filename, f, data, opts);
fclose(f);
}
return ret;
@ -2048,7 +2068,7 @@ int git_config_from_mem(config_fn_t fn,
top.do_ungetc = config_buf_ungetc;
top.do_ftell = config_buf_ftell;
return do_config_from(&top, fn, data, opts);
return do_config_from(&the_reader, &top, fn, data, opts);
}
int git_config_from_blob_oid(config_fn_t fn,
@ -3797,8 +3817,8 @@ const char *current_config_origin_type(void)
int type;
if (current_config_kvi)
type = current_config_kvi->origin_type;
else if(cf_global)
type = cf_global->origin_type;
else if(the_reader.source)
type = the_reader.source->origin_type;
else
BUG("current_config_origin_type called outside config callback");
@ -3843,8 +3863,8 @@ const char *current_config_name(void)
const char *name;
if (current_config_kvi)
name = current_config_kvi->filename;
else if (cf_global)
name = cf_global->name;
else if (the_reader.source)
name = the_reader.source->name;
else
BUG("current_config_name called outside config callback");
return name ? name : "";
@ -3863,7 +3883,7 @@ int current_config_line(void)
if (current_config_kvi)
return current_config_kvi->linenr;
else
return cf_global->linenr;
return the_reader.source->linenr;
}
int lookup_config(const char **mapping, int nr_mapping, const char *var)