forked from fish-shell/fish-shell
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathenv.cpp
1490 lines (1262 loc) · 35 KB
/
env.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/** \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 ^ /tmp/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");
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 (int 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", wide_name.c_str(), 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 fishd_dir_wstr = env_get_string(L"FISHD_SOCKET_DIR");
const env_var_t user_dir_wstr = env_get_string(L"USER");
wchar_t * fishd_dir = fishd_dir_wstr.missing()?NULL:const_cast<wchar_t*>(fishd_dir_wstr.c_str());
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));
/* Set fish_bind_mode to "default" */
env_set(FISH_BIND_MODE_VAR, DEFAULT_BIND_MODE, ENV_GLOBAL);
}
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.reserve(3);
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
{