/** \file env.c
Functions for setting and getting environment variables.
*/
#include "config.h"
#include <stdlib.h>
#include <wchar.h>
#include <string.h>
#include <stdio.h>
#include <locale.h>
#include <unistd.h>
#include <signal.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <pthread.h>
#include <pwd.h>
#include <set>
#include <map>
#include <algorithm>
#if HAVE_NCURSES_H
#include <ncurses.h>
#else
#include <curses.h>
#endif
#if HAVE_TERM_H
#include <term.h>
#elif HAVE_NCURSES_TERM_H
#include <ncurses/term.h>
#endif
#if HAVE_LIBINTL_H
#include <libintl.h>
#endif
#include <errno.h>
#include "fallback.h"
#include "util.h"
#include "wutil.h"
#include "proc.h"
#include "common.h"
#include "env.h"
#include "sanity.h"
#include "expand.h"
#include "history.h"
#include "reader.h"
#include "parser.h"
#include "env_universal.h"
#include "input.h"
#include "event.h"
#include "path.h"
#include "complete.h"
/** Command used to start fishd */
#define FISHD_CMD L"fishd ^ $__fish_runtime_dir/fishd.log.%s"
// Version for easier debugging
//#define FISHD_CMD L"fishd"
/** Value denoting a null string */
#define ENV_NULL L"\x1d"
/** Some configuration path environment variables */
#define FISH_DATADIR_VAR L"__fish_datadir"
#define FISH_SYSCONFDIR_VAR L"__fish_sysconfdir"
#define FISH_HELPDIR_VAR L"__fish_help_dir"
#define FISH_BIN_DIR L"__fish_bin_dir"
/**
At init, we read all the environment variables from this array.
*/
extern char **environ;
/**
This should be the same thing as \c environ, but it is possible only one of the two work...
*/
extern char **__environ;
/**
A variable entry. Stores the value of a variable and whether it
should be exported. Obviously, it needs to be allocated large
enough to fit the value string.
*/
struct var_entry_t
{
wcstring val; /**< The value of the variable */
bool exportv; /**< Whether the variable should be exported */
var_entry_t() : exportv(false) { }
};
typedef std::map<wcstring, var_entry_t> var_table_t;
bool g_log_forks = false;
bool g_use_posix_spawn = false; //will usually be set to true
/**
Struct representing one level in the function variable stack
*/
struct env_node_t
{
/**
Variable table
*/
var_table_t env;
/**
Does this node imply a new variable scope? If yes, all
non-global variables below this one in the stack are
invisible. If new_scope is set for the global variable node,
the universe will explode.
*/
bool new_scope;
/**
Does this node contain any variables which are exported to subshells
*/
bool exportv;
/**
Pointer to next level
*/
struct env_node_t *next;
env_node_t() : new_scope(false), exportv(false), next(NULL) { }
/* Returns a pointer to the given entry if present, or NULL. */
const var_entry_t *find_entry(const wcstring &key);
/* Returns the next scope to search in order, respecting the new_scope flag, or NULL if we're done. */
env_node_t *next_scope_to_search(void);
};
class variable_entry_t
{
wcstring value; /**< Value of the variable */
};
static pthread_mutex_t env_lock = PTHREAD_MUTEX_INITIALIZER;
/** Top node on the function stack */
static env_node_t *top = NULL;
/** Bottom node on the function stack */
static env_node_t *global_env = NULL;
/**
Table for global variables
*/
static var_table_t *global;
/* Helper class for storing constant strings, without needing to wrap them in a wcstring */
/* Comparer for const string set */
struct const_string_set_comparer
{
bool operator()(const wchar_t *a, const wchar_t *b)
{
return wcscmp(a, b) < 0;
}
};
typedef std::set<const wchar_t *, const_string_set_comparer> const_string_set_t;
/** Table of variables that may not be set using the set command. */
static const_string_set_t env_read_only;
static bool is_read_only(const wcstring &key)
{
return env_read_only.find(key.c_str()) != env_read_only.end();
}
/**
Table of variables whose value is dynamically calculated, such as umask, status, etc
*/
static const_string_set_t env_electric;
static bool is_electric(const wcstring &key)
{
return env_electric.find(key.c_str()) != env_electric.end();
}
/**
Exported variable array used by execv
*/
static null_terminated_array_t<char> export_array;
/**
Flag for checking if we need to regenerate the exported variable
array
*/
static bool has_changed_exported = true;
static void mark_changed_exported()
{
has_changed_exported = true;
}
/**
List of all locale variable names
*/
static const wchar_t * const locale_variable[] =
{
L"LANG",
L"LC_ALL",
L"LC_COLLATE",
L"LC_CTYPE",
L"LC_MESSAGES",
L"LC_MONETARY",
L"LC_NUMERIC",
L"LC_TIME",
NULL
};
const var_entry_t *env_node_t::find_entry(const wcstring &key)
{
const var_entry_t *result = NULL;
var_table_t::const_iterator where = env.find(key);
if (where != env.end())
{
result = &where->second;
}
return result;
}
env_node_t *env_node_t::next_scope_to_search(void)
{
return this->new_scope ? global_env : this->next;
}
/**
When fishd isn't started, this function is provided to
env_universal as a callback, it tries to start up fishd. It's
implementation is a bit of a hack, since it evaluates a bit of
shellscript, and it might be used at times when that might not be
the best idea.
*/
static void start_fishd()
{
struct passwd *pw = getpwuid(getuid());
debug(3, L"Spawning new copy of fishd");
if (!pw)
{
debug(0, _(L"Could not get user information"));
return;
}
wcstring cmd = format_string(FISHD_CMD, pw->pw_name);
/* Prefer the fishd in __fish_bin_dir, if exists */
const env_var_t bin_dir = env_get_string(L"__fish_bin_dir");
if (! bin_dir.missing_or_empty())
{
wcstring path = bin_dir + L"/fishd";
if (waccess(path, X_OK) == 0)
{
/* The path command just looks like 'fishd', so insert the bin path to make it absolute */
cmd.insert(0, bin_dir + L"/");
}
}
parser_t &parser = parser_t::principal_parser();
parser.eval(cmd, io_chain_t(), TOP);
}
/**
Return the current umask value.
*/
static mode_t get_umask()
{
mode_t res;
res = umask(0);
umask(res);
return res;
}
/** Checks if the specified variable is a locale variable */
static bool var_is_locale(const wcstring &key)
{
for (size_t i=0; locale_variable[i]; i++)
{
if (key == locale_variable[i])
{
return true;
}
}
return false;
}
/**
Properly sets all locale information
*/
static void handle_locale()
{
const env_var_t lc_all = env_get_string(L"LC_ALL");
int i;
const wcstring old_locale = wsetlocale(LC_MESSAGES, NULL);
/*
Array of locale constants corresponding to the local variable names defined in locale_variable
*/
static const int cat[] =
{
0,
LC_ALL,
LC_COLLATE,
LC_CTYPE,
LC_MESSAGES,
LC_MONETARY,
LC_NUMERIC,
LC_TIME
}
;
if (!lc_all.missing())
{
wsetlocale(LC_ALL, lc_all.c_str());
}
else
{
const env_var_t lang = env_get_string(L"LANG");
if (!lang.missing())
{
wsetlocale(LC_ALL, lang.c_str());
}
for (i=2; locale_variable[i]; i++)
{
const env_var_t val = env_get_string(locale_variable[i]);
if (!val.missing())
{
wsetlocale(cat[i], val.c_str());
}
}
}
const wcstring new_locale = wsetlocale(LC_MESSAGES, NULL);
if (old_locale != new_locale)
{
/*
Try to make change known to gettext. Both changing
_nl_msg_cat_cntr and calling dcgettext might potentially
tell some gettext implementation that the translation
strings should be reloaded. We do both and hope for the
best.
*/
extern int _nl_msg_cat_cntr;
_nl_msg_cat_cntr++;
fish_dcgettext("fish", "Changing language to English", LC_MESSAGES);
if (get_is_interactive())
{
debug(0, _(L"Changing language to English"));
}
}
}
/** React to modifying hte given variable */
static void react_to_variable_change(const wcstring &key)
{
if (var_is_locale(key))
{
handle_locale();
}
else if (key == L"fish_term256")
{
update_fish_term256();
reader_react_to_color_change();
}
else if (string_prefixes_string(L"fish_color_", key))
{
reader_react_to_color_change();
}
}
/**
Universal variable callback function. This function makes sure the
proper events are triggered when an event occurs.
*/
static void universal_callback(fish_message_type_t type,
const wchar_t *name,
const wchar_t *val)
{
const wchar_t *str = NULL;
switch (type)
{
case SET:
case SET_EXPORT:
{
str=L"SET";
break;
}
case ERASE:
{
str=L"ERASE";
break;
}
default:
break;
}
if (str)
{
mark_changed_exported();
event_t ev = event_t::variable_event(name);
ev.arguments.push_back(L"VARIABLE");
ev.arguments.push_back(str);
ev.arguments.push_back(name);
event_fire(&ev);
}
if (name)
react_to_variable_change(name);
}
/**
Make sure the PATH variable contains something
*/
static void setup_path()
{
const env_var_t path = env_get_string(L"PATH");
if (path.missing_or_empty())
{
const wchar_t *value = L"/usr/bin" ARRAY_SEP_STR L"/bin";
env_set(L"PATH", value, ENV_GLOBAL | ENV_EXPORT);
}
}
int env_set_pwd()
{
wchar_t dir_path[4096];
wchar_t *res = wgetcwd(dir_path, 4096);
if (!res)
{
return 0;
}
env_set(L"PWD", dir_path, ENV_EXPORT | ENV_GLOBAL);
return 1;
}
wcstring env_get_pwd_slash(void)
{
env_var_t pwd = env_get_string(L"PWD");
if (pwd.missing_or_empty())
{
return L"";
}
if (! string_suffixes_string(L"/", pwd))
{
pwd.push_back(L'/');
}
return pwd;
}
/**
Set up default values for various variables if not defined.
*/
static void env_set_defaults()
{
if (env_get_string(L"USER").missing())
{
struct passwd *pw = getpwuid(getuid());
if (pw->pw_name != NULL)
{
const wcstring wide_name = str2wcstring(pw->pw_name);
env_set(L"USER", NULL, ENV_GLOBAL);
}
}
if (env_get_string(L"HOME").missing())
{
const env_var_t unam = env_get_string(L"USER");
char *unam_narrow = wcs2str(unam.c_str());
struct passwd *pw = getpwnam(unam_narrow);
if (pw->pw_dir != NULL)
{
const wcstring dir = str2wcstring(pw->pw_dir);
env_set(L"HOME", dir.c_str(), ENV_GLOBAL);
}
free(unam_narrow);
}
env_set_pwd();
}
// Some variables should not be arrays. This used to be handled by a startup script, but we'd like to get down to 0 forks for startup, so handle it here.
static bool variable_can_be_array(const wcstring &key)
{
if (key == L"DISPLAY")
{
return false;
}
else
{
return true;
}
}
void env_init(const struct config_paths_t *paths /* or NULL */)
{
/*
env_read_only variables can not be altered directly by the user
*/
const wchar_t * const ro_keys[] =
{
L"status",
L"history",
L"version",
L"_",
L"LINES",
L"COLUMNS",
L"PWD",
L"SHLVL",
L"FISH_VERSION",
};
for (size_t i=0; i < sizeof ro_keys / sizeof *ro_keys; i++)
{
env_read_only.insert(ro_keys[i]);
}
/*
HOME and USER should be writeable by root, since this can be a
convenient way to install software.
*/
if (getuid() != 0)
{
env_read_only.insert(L"HOME");
env_read_only.insert(L"USER");
}
/*
Names of all dynamically calculated variables
*/
env_electric.insert(L"history");
env_electric.insert(L"status");
env_electric.insert(L"umask");
top = new env_node_t;
global_env = top;
global = &top->env;
/*
Now the environemnt variable handling is set up, the next step
is to insert valid data
*/
/*
Import environment variables
*/
for (char **p = (environ ? environ : __environ); p && *p; p++)
{
const wcstring key_and_val = str2wcstring(*p); //like foo=bar
size_t eql = key_and_val.find(L'=');
if (eql == wcstring::npos)
{
// no equals found
env_set(key_and_val, L"", ENV_EXPORT);
}
else
{
wcstring key = key_and_val.substr(0, eql);
wcstring val = key_and_val.substr(eql + 1);
if (variable_can_be_array(val))
{
std::replace(val.begin(), val.end(), L':', ARRAY_SEP);
}
env_set(key, val.c_str(), ENV_EXPORT | ENV_GLOBAL);
}
}
/* Set the given paths in the environment, if we have any */
if (paths != NULL)
{
env_set(FISH_DATADIR_VAR, paths->data.c_str(), ENV_GLOBAL | ENV_EXPORT);
env_set(FISH_SYSCONFDIR_VAR, paths->sysconf.c_str(), ENV_GLOBAL | ENV_EXPORT);
env_set(FISH_HELPDIR_VAR, paths->doc.c_str(), ENV_GLOBAL | ENV_EXPORT);
env_set(FISH_BIN_DIR, paths->bin.c_str(), ENV_GLOBAL | ENV_EXPORT);
}
/*
Set up the PATH variable
*/
setup_path();
/*
Set up the USER variable
*/
const struct passwd *pw = getpwuid(getuid());
if (pw && pw->pw_name)
{
const wcstring uname = str2wcstring(pw->pw_name);
env_set(L"USER", uname.c_str(), ENV_GLOBAL | ENV_EXPORT);
}
/*
Set up the version variables
*/
wcstring version = str2wcstring(FISH_BUILD_VERSION);
env_set(L"version", version.c_str(), ENV_GLOBAL);
env_set(L"FISH_VERSION", version.c_str(), ENV_GLOBAL);
const env_var_t user_dir_wstr = env_get_string(L"USER");
std::string fishd_dir = common_get_runtime_path();
env_set(L"__fish_runtime_dir", str2wcstring(fishd_dir).c_str(), ENV_GLOBAL | ENV_EXPORT);
wchar_t * user_dir = user_dir_wstr.missing()?NULL:const_cast<wchar_t*>(user_dir_wstr.c_str());
env_universal_init(fishd_dir , user_dir ,
&start_fishd,
&universal_callback);
/*
Set up SHLVL variable
*/
const env_var_t shlvl_str = env_get_string(L"SHLVL");
wcstring nshlvl_str = L"1";
if (! shlvl_str.missing())
{
long shlvl_i = wcstol(shlvl_str.c_str(), NULL, 10);
if (shlvl_i >= 0)
{
nshlvl_str = to_string<long>(shlvl_i + 1);
}
}
env_set(L"SHLVL", nshlvl_str.c_str(), ENV_GLOBAL | ENV_EXPORT);
/* Set correct defaults for e.g. USER and HOME variables */
env_set_defaults();
/* Set g_log_forks */
env_var_t log_forks = env_get_string(L"fish_log_forks");
g_log_forks = ! log_forks.missing_or_empty() && from_string<bool>(log_forks);
/* Set g_use_posix_spawn. Default to true. */
env_var_t use_posix_spawn = env_get_string(L"fish_use_posix_spawn");
g_use_posix_spawn = (use_posix_spawn.missing_or_empty() ? true : from_string<bool>(use_posix_spawn));
}
void env_destroy()
{
env_universal_destroy();
while (&top->env != global)
{
env_pop();
}
env_read_only.clear();
env_electric.clear();
var_table_t::iterator iter;
for (iter = global->begin(); iter != global->end(); ++iter)
{
const var_entry_t &entry = iter->second;
if (entry.exportv)
{
mark_changed_exported();
break;
}
}
delete top;
}
/**
Search all visible scopes in order for the specified key. Return
the first scope in which it was found.
*/
static env_node_t *env_get_node(const wcstring &key)
{
env_node_t *env = top;
while (env != NULL)
{
if (env->find_entry(key) != NULL)
{
break;
}
env = env->next_scope_to_search();
}
return env;
}
int env_set(const wcstring &key, const wchar_t *val, int var_mode)
{
ASSERT_IS_MAIN_THREAD();
bool has_changed_old = has_changed_exported;
bool has_changed_new = false;
int done=0;
int is_universal = 0;
if (val && contains(key, L"PWD", L"HOME"))
{
/* Canoncalize our path; if it changes, recurse and try again. */
wcstring val_canonical = val;
path_make_canonical(val_canonical);
if (val != val_canonical)
{
return env_set(key, val_canonical.c_str(), var_mode);
}
}
if ((var_mode & ENV_USER) && is_read_only(key))
{
return ENV_PERM;
}
if (key == L"umask")
{
wchar_t *end;
/*
Set the new umask
*/
if (val && wcslen(val))
{
errno=0;
long mask = wcstol(val, &end, 8);
if (!errno && (!*end) && (mask <= 0777) && (mask >= 0))
{
umask(mask);
}
}
/* Do not actually create a umask variable, on env_get, it will be calculated dynamically */
return 0;
}
/*
Zero element arrays are internaly not coded as null but as this
placeholder string
*/
if (!val)
{
val = ENV_NULL;
}
if (var_mode & ENV_UNIVERSAL)
{
bool exportv;
if (var_mode & ENV_EXPORT)
{
// export
exportv = true;
}
else if (var_mode & ENV_UNEXPORT)
{
// unexport
exportv = false;
}
else
{
// not changing the export
exportv = env_universal_get_export(key);
}
env_universal_set(key, val, exportv);
is_universal = 1;
}
else
{
// Determine the node
env_node_t *preexisting_node = env_get_node(key);
bool preexisting_entry_exportv = false;
if (preexisting_node != NULL)
{
var_table_t::const_iterator result = preexisting_node->env.find(key);
assert(result != preexisting_node->env.end());
const var_entry_t &entry = result->second;
if (entry.exportv)
{
preexisting_entry_exportv = true;
has_changed_new = true;
}
}
env_node_t *node = NULL;
if (var_mode & ENV_GLOBAL)
{
node = global_env;
}
else if (var_mode & ENV_LOCAL)
{
node = top;
}
else if (preexisting_node != NULL)
{
node = preexisting_node;
if ((var_mode & (ENV_EXPORT | ENV_UNEXPORT)) == 0)
{
// use existing entry's exportv
var_mode = preexisting_entry_exportv ? ENV_EXPORT : 0;
}
}
else
{
if (! get_proc_had_barrier())
{
set_proc_had_barrier(true);
env_universal_barrier();
}
if (env_universal_get(key))
{
bool exportv;
if (var_mode & ENV_EXPORT)
{
exportv = true;
}
else if (var_mode & ENV_UNEXPORT)
{
exportv = false;
}
else
{
exportv = env_universal_get_export(key);
}
env_universal_set(key, val, exportv);
is_universal = 1;
done = 1;
}
else
{
/*
New variable with unspecified scope. The default
scope is the innermost scope that is shadowing,
which will be either the current function or the
global scope.
*/
node = top;
while (node->next && !node->new_scope)
{
node = node->next;
}
}
}
if (!done)
{
// Set the entry in the node
// Note that operator[] accesses the existing entry, or creates a new one
var_entry_t &entry = node->env[key];
if (entry.exportv)
{
// this variable already existed, and was exported
has_changed_new = true;
}
entry.val = val;
if (var_mode & ENV_EXPORT)
{
// the new variable is exported
entry.exportv = true;
node->exportv = true;
has_changed_new = true;
}
else
{
entry.exportv = false;
}
if (has_changed_old || has_changed_new)
mark_changed_exported();
}
}
if (!is_universal)
{
event_t ev = event_t::variable_event(key);
ev.arguments.push_back(L"VARIABLE");
ev.arguments.push_back(L"SET");
ev.arguments.push_back(key);
// debug( 1, L"env_set: fire events on variable %ls", key );
event_fire(&ev);
// debug( 1, L"env_set: return from event firing" );
}
react_to_variable_change(key);
return 0;
}
/**
Attempt to remove/free the specified key/value pair from the
specified map.
\return zero if the variable was not found, non-zero otherwise
*/
static bool try_remove(env_node_t *n, const wchar_t *key, int var_mode)
{
if (n == NULL)
{
return false;
}
var_table_t::iterator result = n->env.find(key);
if (result != n->env.end())
{
if (result->second.exportv)
{
mark_changed_exported();
}
n->env.erase(result);
return true;
}
if (var_mode & ENV_LOCAL)
{
return false;
}
if (n->new_scope)
{
return try_remove(global_env, key, var_mode);
}
else
{
return try_remove(n->next, key, var_mode);
}
}
int env_remove(const wcstring &key, int var_mode)
{
ASSERT_IS_MAIN_THREAD();
env_node_t *first_node;
int erased = 0;
if ((var_mode & ENV_USER) && is_read_only(key))
{
return 2;
}
first_node = top;
if (!(var_mode & ENV_UNIVERSAL))
{
if (var_mode & ENV_GLOBAL)
{
first_node = global_env;
}
if (try_remove(first_node, key.c_str(), var_mode))
{
event_t ev = event_t::variable_event(key);
ev.arguments.push_back(L"VARIABLE");
ev.arguments.push_back(L"ERASE");
ev.arguments.push_back(key);
event_fire(&ev);
erased = 1;
}
}
if (!erased &&
!(var_mode & ENV_GLOBAL) &&
!(var_mode & ENV_LOCAL))
{
erased = ! env_universal_remove(key.c_str());
}
react_to_variable_change(key);
return !erased;
}
const wchar_t *env_var_t::c_str(void) const
{
assert(! is_missing);
return wcstring::c_str();
}
env_var_t env_get_string(const wcstring &key)
{
/* Big hack...we only allow getting the history on the main thread. Note that history_t may ask for an environment variable, so don't take the lock here (we don't need it) */
const bool is_main = is_main_thread();
if (key == L"history" && is_main)
{
env_var_t result;
history_t *history = reader_get_history();
if (! history)
{
history = &history_t::history_with_name(L"fish");
}
if (history)
history->get_string_representation(result, ARRAY_SEP_STR);
return result;
}
else if (key == L"COLUMNS")
{
return to_string(common_get_width());
}
else if (key == L"LINES")
{
return to_string(common_get_height());
}
else if (key == L"status")
{
return to_string(proc_get_last_status());
}
else if (key == L"umask")
{
return format_string(L"0%0.3o", get_umask());
}
else
{
{
/* Lock around a local region */
scoped_lock lock(env_lock);
env_node_t *env = top;
wcstring result;
while (env != NULL)
{
const var_entry_t *entry = env->find_entry(key);
if (entry != NULL)
{
if (entry->val == ENV_NULL)
{
return env_var_t::missing_var();
}
else
{
return entry->val;
}
}
env = env->next_scope_to_search();
}
}
/* Another big hack - only do a universal barrier on the main thread (since it can change variable values)
Make sure we do this outside the env_lock because it may itself call env_get_string */
if (is_main && ! get_proc_had_barrier())
{
set_proc_had_barrier(true);
env_universal_barrier();
}
const wchar_t *item = env_universal_get(key);
if (!item || (wcscmp(item, ENV_NULL)==0))
{
return env_var_t::missing_var();
}
else
{
return item;
}
}
}
bool env_exist(const wchar_t *key, int mode)
{
env_node_t *env;
const wchar_t *item = NULL;
CHECK(key, false);
/*
Read only variables all exist, and they are all global. A local
version can not exist.
*/
if (!(mode & ENV_LOCAL) && !(mode & ENV_UNIVERSAL))
{
if (is_read_only(key) || is_electric(key))
{
//Such variables are never exported
if (mode & ENV_EXPORT)
{
return false;
}
else if (mode & ENV_UNEXPORT)
{
return true;
}
return true;
}
}
if (!(mode & ENV_UNIVERSAL))
{
env = (mode & ENV_GLOBAL)?global_env:top;
while (env != 0)
{
var_table_t::iterator result = env->env.find(key);
if (result != env->env.end())
{
const var_entry_t &res = result->second;
if (mode & ENV_EXPORT)
{
return res.exportv;
}
else if (mode & ENV_UNEXPORT)
{
return ! res.exportv;
}
return true;
}
if (mode & ENV_LOCAL)
break;
env = env->next_scope_to_search();
}
}
if (!(mode & ENV_LOCAL) && !(mode & ENV_GLOBAL))
{
if (! get_proc_had_barrier())
{
set_proc_had_barrier(true);
env_universal_barrier();
}
item = env_universal_get(key);
if (item != NULL)
{
if (mode & ENV_EXPORT)
{
return env_universal_get_export(key) == 1;
}
else if (mode & ENV_UNEXPORT)
{
return env_universal_get_export(key) == 0;
}
return 1;
}
}
return 0;
}
/**
Returns true if the specified scope or any non-shadowed non-global subscopes contain an exported variable.
*/
static int local_scope_exports(env_node_t *n)
{
if (n==global_env)
return 0;
if (n->exportv)
return 1;
if (n->new_scope)
return 0;
return local_scope_exports(n->next);
}
void env_push(bool new_scope)
{
env_node_t *node = new env_node_t;
node->next = top;
node->new_scope=new_scope;
if (new_scope)
{
if (local_scope_exports(top))
mark_changed_exported();
}
top = node;
}
void env_pop()
{
if (&top->env != global)
{
int i;
int locale_changed = 0;
env_node_t *killme = top;
for (i=0; locale_variable[i]; i++)
{
var_table_t::iterator result = killme->env.find(locale_variable[i]);
if (result != killme->env.end())
{
locale_changed = 1;
break;
}
}
if (killme->new_scope)
{
if (killme->exportv || local_scope_exports(killme->next))
mark_changed_exported();
}
top = top->next;
var_table_t::iterator iter;
for (iter = killme->env.begin(); iter != killme->env.end(); ++iter)
{
const var_entry_t &entry = iter->second;
if (entry.exportv)
{
mark_changed_exported();
break;
}
}
delete killme;
if (locale_changed)
handle_locale();
}
else
{
debug(0,
_(L"Tried to pop empty environment stack."));
sanity_lose();
}
}
/**
Function used with to insert keys of one table into a set::set<wcstring>
*/
static void add_key_to_string_set(const var_table_t &envs, std::set<wcstring> *str_set, bool show_exported, bool show_unexported)
{
var_table_t::const_iterator iter;
for (iter = envs.begin(); iter != envs.end(); ++iter)
{
const var_entry_t &e = iter->second;
if ((e.exportv && show_exported) ||
(!e.exportv && show_unexported))
{
/* Insert this key */
str_set->insert(iter->first);
}
}
}
wcstring_list_t env_get_names(int flags)
{
scoped_lock lock(env_lock);
wcstring_list_t result;
std::set<wcstring> names;
int show_local = flags & ENV_LOCAL;
int show_global = flags & ENV_GLOBAL;
int show_universal = flags & ENV_UNIVERSAL;
env_node_t *n=top;
const bool show_exported = (flags & ENV_EXPORT) || !(flags & ENV_UNEXPORT);
const bool show_unexported = (flags & ENV_UNEXPORT) || !(flags & ENV_EXPORT);
if (!show_local && !show_global && !show_universal)
{
show_local =show_universal = show_global=1;
}
if (show_local)
{
while (n)
{
if (n == global_env)
break;
add_key_to_string_set(n->env, &names, show_exported, show_unexported);
if (n->new_scope)
break;
else
n = n->next;
}
}
if (show_global)
{
add_key_to_string_set(global_env->env, &names, show_exported, show_unexported);
if (show_unexported)
{
result.insert(result.end(), env_electric.begin(), env_electric.end());
}
if (show_exported)
{
result.push_back(L"COLUMNS");
result.push_back(L"LINES");
}
}
if (show_universal)
{
wcstring_list_t uni_list;
env_universal_get_names(uni_list,
show_exported,
show_unexported);
names.insert(uni_list.begin(), uni_list.end());
}
result.insert(result.end(), names.begin(), names.end());
return result;
}
/**
Get list of all exported variables
*/
static void get_exported(const env_node_t *n, std::map<wcstring, wcstring> &h)
{
if (!n)
return;
if (n->new_scope)
get_exported(global_env, h);
else
get_exported(n->next, h);
var_table_t::const_iterator iter;
for (iter = n->env.begin(); iter != n->env.end(); ++iter)
{
const wcstring &key = iter->first;
const var_entry_t &val_entry = iter->second;
if (val_entry.exportv && (val_entry.val != ENV_NULL))
{
// Don't use std::map::insert here, since we need to overwrite existing values from previous scopes
h[key] = val_entry.val;
}
}
}
static void export_func(const std::map<wcstring, wcstring> &envs, std::vector<std::string> &out)
{
std::map<wcstring, wcstring>::const_iterator iter;
for (iter = envs.begin(); iter != envs.end(); ++iter)
{
const std::string ks = wcs2string(iter->first);
std::string vs = wcs2string(iter->second);
for (size_t i=0; i < vs.size(); i++)
{
char &vc = vs.at(i);
if (vc == ARRAY_SEP)
vc = ':';
}
/* Put a string on the vector */
out.push_back(std::string());
std::string &str = out.back();
str.reserve(ks.size() + 1 + vs.size());
/* Append our environment variable data to it */
str.append(ks);
str.append("=");
str.append(vs);
}
}
static void update_export_array_if_necessary(bool recalc)
{
ASSERT_IS_MAIN_THREAD();
if (recalc && ! get_proc_had_barrier())
{
set_proc_had_barrier(true);
env_universal_barrier();
}
if (has_changed_exported)
{
std::map<wcstring, wcstring> vals;
size_t i;
debug(4, L"env_export_arr() recalc");
get_exported(top, vals);
wcstring_list_t uni;
env_universal_get_names(uni, 1, 0);
for (i=0; i<uni.size(); i++)
{
const wcstring &key = uni.at(i);
const wchar_t *val = env_universal_get(key);
if (wcscmp(val, ENV_NULL))
{
// Note that std::map::insert does NOT overwrite a value already in the map,
// which we depend on here
vals.insert(std::pair<wcstring, wcstring>(key, val));
}
}
std::vector<std::string> local_export_buffer;
export_func(vals, local_export_buffer);
export_array.set(local_export_buffer);
has_changed_exported=false;
}
}
const char * const *env_export_arr(bool recalc)
{
ASSERT_IS_MAIN_THREAD();
update_export_array_if_necessary(recalc);
return export_array.get();
}
env_vars_snapshot_t::env_vars_snapshot_t(const wchar_t * const *keys)
{
ASSERT_IS_MAIN_THREAD();
wcstring key;
for (size_t i=0; keys[i]; i++)
{
key.assign(keys[i]);
const env_var_t val = env_get_string(key);
if (! val.missing())
{
vars[key] = val;
}
}
}
env_vars_snapshot_t::env_vars_snapshot_t() { }
/* The "current" variables are not a snapshot at all, but instead trampoline to env_get_string, etc. We identify the current snapshot based on pointer values. */
static const env_vars_snapshot_t sCurrentSnapshot;
const env_vars_snapshot_t &env_vars_snapshot_t::current()
{
return sCurrentSnapshot;
}
bool env_vars_snapshot_t::is_current() const
{
return this == &sCurrentSnapshot;
}
env_var_t env_vars_snapshot_t::get(const wcstring &key) const
{
/* If we represent the current state, bounce to env_get_string */
if (this->is_current())
{
return env_get_string(key);
}
else
{
std::map<wcstring, wcstring>::const_iterator iter = vars.find(key);
return (iter == vars.end() ? env_var_t::missing_var() : env_var_t(iter->second));
}
}
const wchar_t * const env_vars_snapshot_t::highlighting_keys[] = {L"PATH", L"CDPATH", L"fish_function_path", NULL};