unique_path: fix unlikely heap overflow
[git/git.git] / environment.c
CommitLineData
e1b10391
LT
1/*
2 * We put all the git config variables in this same object
3 * file, so that programs can link against the config parser
4 * without having to link against all the rest of git.
5 *
6 * In particular, no need to bring in libz etc unless needed,
7 * even if you might want to know where the git directory etc
8 * are.
9 */
10#include "cache.h"
a1bea2c1 11#include "refs.h"
273c7032 12#include "fmt-merge-msg.h"
069c0532 13#include "commit.h"
e1b10391 14
e1b10391 15int trust_executable_bit = 1;
1ce4790b 16int trust_ctime = 1;
c08e4d5b 17int check_stat = 1;
78a8d641 18int has_symlinks = 1;
dce96489 19int minimum_abbrev = 4, default_abbrev = 7;
0a9b88b7 20int ignore_case;
96f1e58f
DR
21int assume_unchanged;
22int prefer_symlink_refs;
7d1864ce 23int is_bare_repository_cfg = -1; /* unspecified */
510c5a8e 24int log_all_ref_updates = -1; /* unspecified */
1b371f56 25int warn_ambiguous_refs = 1;
25fba78d 26int warn_on_object_refname_ambiguity = 1;
96f1e58f 27int repository_format_version;
1a8f2741 28const char *git_commit_encoding;
3a55602e 29const char *git_log_output_encoding;
94df2506 30int shared_repository = PERM_UMASK;
96f1e58f 31const char *apply_default_whitespace;
86c91f91 32const char *apply_default_ignorewhitespace;
64589a03 33const char *git_attributes_file;
960ccca6
DH
34int zlib_compression_level = Z_BEST_SPEED;
35int core_compression_level;
36int core_compression_seen;
aafe9fba 37int fsync_object_files;
8c82534d
SP
38size_t packed_git_window_size = DEFAULT_PACKED_GIT_WINDOW_SIZE;
39size_t packed_git_limit = DEFAULT_PACKED_GIT_LIMIT;
4874f544 40size_t delta_base_cache_limit = 96 * 1024 * 1024;
15366280 41unsigned long big_file_threshold = 512 * 1024 * 1024;
872da32d 42const char *pager_program;
aa086eb8 43int pager_use_color = 1;
ee9601e6 44const char *editor_program;
d3e7da89 45const char *askpass_program;
dfb068be 46const char *excludes_file;
fd6cce9e 47enum auto_crlf auto_crlf = AUTO_CRLF_FALSE;
afc711b8 48int check_replace_refs = 1;
ec70f52f 49enum eol core_eol = EOL_UNSET;
21e5ad50 50enum safe_crlf safe_crlf = SAFE_CRLF_WARN;
cf1b7869 51unsigned whitespace_rule_cfg = WS_DEFAULT_RULE;
9ed36cfa 52enum branch_track git_branch_track = BRANCH_TRACK_REMOTE;
c998ae9b 53enum rebase_setup_type autorebase = AUTOREBASE_NEVER;
f25950f3 54enum push_default_type push_default = PUSH_DEFAULT_UNSPECIFIED;
348df166
JS
55#ifndef OBJECT_CREATION_MODE
56#define OBJECT_CREATION_MODE OBJECT_CREATION_USES_HARDLINKS
be66a6c4 57#endif
348df166 58enum object_creation_mode object_creation_mode = OBJECT_CREATION_MODE;
a97a7468 59char *notes_ref_name;
7f3140cd 60int grafts_replace_parents = 1;
08aefc9e 61int core_apply_sparse_checkout;
898eacd8 62int merge_log_config = -1;
76759c7d 63int precomposed_unicode = -1; /* see probe_utf8_pathname_composition() */
e37c1329 64struct startup_info *startup_info;
568508e7 65unsigned long pack_size_limit_cfg;
e1b10391 66
eff80a9f
JH
67/*
68 * The character that begins a commented line in user-editable file
69 * that is subject to stripspace.
70 */
71char comment_line_char = '#';
84c9dc2c 72int auto_comment_line_char;
eff80a9f 73
671c9b7e 74/* Parallel index stat data preload? */
299e2987 75int core_preload_index = 1;
671c9b7e 76
e90fdc39
JS
77/* This is set by setup_git_dir_gently() and/or git_default_config() */
78char *git_work_tree_cfg;
19757d80 79static char *work_tree;
e90fdc39 80
a1bea2c1
JT
81static const char *namespace;
82static size_t namespace_len;
83
c5fba16c 84static const char *git_dir;
7f7868ea 85static char *git_object_dir, *git_index_file, *git_graft_file;
c5fba16c 86
48a7c1c4 87/*
2163e5db 88 * Repository-local GIT_* environment variables; see cache.h for details.
48a7c1c4 89 */
2163e5db 90const char * const local_repo_env[] = {
48a7c1c4
GB
91 ALTERNATE_DB_ENVIRONMENT,
92 CONFIG_ENVIRONMENT,
655e8d9c 93 CONFIG_DATA_ENVIRONMENT,
48a7c1c4
GB
94 DB_ENVIRONMENT,
95 GIT_DIR_ENVIRONMENT,
96 GIT_WORK_TREE_ENVIRONMENT,
2cd83d10 97 GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,
48a7c1c4
GB
98 GRAFT_ENVIRONMENT,
99 INDEX_ENVIRONMENT,
100 NO_REPLACE_OBJECTS_ENVIRONMENT,
a6f7f9a3 101 GIT_PREFIX_ENVIRONMENT,
069c0532 102 GIT_SHALLOW_FILE_ENVIRONMENT,
48a7c1c4
GB
103 NULL
104};
105
a1bea2c1
JT
106static char *expand_namespace(const char *raw_namespace)
107{
108 struct strbuf buf = STRBUF_INIT;
109 struct strbuf **components, **c;
110
111 if (!raw_namespace || !*raw_namespace)
112 return xstrdup("");
113
114 strbuf_addstr(&buf, raw_namespace);
115 components = strbuf_split(&buf, '/');
116 strbuf_reset(&buf);
117 for (c = components; *c; c++)
118 if (strcmp((*c)->buf, "/") != 0)
119 strbuf_addf(&buf, "refs/namespaces/%s", (*c)->buf);
120 strbuf_list_free(components);
8d9c5010 121 if (check_refname_format(buf.buf, 0))
a1bea2c1
JT
122 die("bad git namespace path \"%s\"", raw_namespace);
123 strbuf_addch(&buf, '/');
124 return strbuf_detach(&buf, NULL);
125}
126
e1b10391
LT
127static void setup_git_env(void)
128{
487a2b73 129 const char *gitfile;
069c0532 130 const char *shallow_file;
487a2b73 131
e1b10391
LT
132 git_dir = getenv(GIT_DIR_ENVIRONMENT);
133 if (!git_dir)
134 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
487a2b73
NTND
135 gitfile = read_gitfile(git_dir);
136 git_dir = xstrdup(gitfile ? gitfile : git_dir);
e1b10391 137 git_object_dir = getenv(DB_ENVIRONMENT);
a0279e18
JK
138 if (!git_object_dir)
139 git_object_dir = git_pathdup("objects");
e1b10391 140 git_index_file = getenv(INDEX_ENVIRONMENT);
a0279e18
JK
141 if (!git_index_file)
142 git_index_file = git_pathdup("index");
e1b10391
LT
143 git_graft_file = getenv(GRAFT_ENVIRONMENT);
144 if (!git_graft_file)
a4f34cbb 145 git_graft_file = git_pathdup("info/grafts");
6476b38b 146 if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
afc711b8 147 check_replace_refs = 0;
a1bea2c1
JT
148 namespace = expand_namespace(getenv(GIT_NAMESPACE_ENVIRONMENT));
149 namespace_len = strlen(namespace);
069c0532
NTND
150 shallow_file = getenv(GIT_SHALLOW_FILE_ENVIRONMENT);
151 if (shallow_file)
152 set_alternate_shallow_file(shallow_file, 0);
0bee5918
SP
153}
154
7d1864ce 155int is_bare_repository(void)
0bee5918 156{
e90fdc39
JS
157 /* if core.bare is not 'false', let's see if there is a work tree */
158 return is_bare_repository_cfg && !get_git_work_tree();
e1b10391
LT
159}
160
c5fba16c 161const char *get_git_dir(void)
e1b10391
LT
162{
163 if (!git_dir)
164 setup_git_env();
165 return git_dir;
166}
167
a1bea2c1
JT
168const char *get_git_namespace(void)
169{
170 if (!namespace)
171 setup_git_env();
172 return namespace;
173}
174
175const char *strip_namespace(const char *namespaced_ref)
176{
59556548 177 if (!starts_with(namespaced_ref, get_git_namespace()))
a1bea2c1
JT
178 return NULL;
179 return namespaced_ref + namespace_len;
180}
181
19757d80
DB
182static int git_work_tree_initialized;
183
184/*
185 * Note. This works only before you used a work tree. This was added
186 * primarily to support git-clone to work in a new repository it just
187 * created, and is not meant to flip between different work trees.
188 */
189void set_git_work_tree(const char *new_work_tree)
190{
83518360 191 if (git_work_tree_initialized) {
e2a57aac 192 new_work_tree = real_path(new_work_tree);
83518360
NTND
193 if (strcmp(new_work_tree, work_tree))
194 die("internal error: work tree has already been set\n"
195 "Current worktree: %s\nNew worktree: %s",
196 work_tree, new_work_tree);
197 return;
198 }
19757d80 199 git_work_tree_initialized = 1;
e2a57aac 200 work_tree = xstrdup(real_path(new_work_tree));
19757d80
DB
201}
202
e90fdc39
JS
203const char *get_git_work_tree(void)
204{
e90fdc39
JS
205 return work_tree;
206}
207
e1b10391
LT
208char *get_object_directory(void)
209{
210 if (!git_object_dir)
211 setup_git_env();
212 return git_object_dir;
213}
214
463db9b1
JN
215int odb_mkstemp(char *template, size_t limit, const char *pattern)
216{
217 int fd;
218 /*
219 * we let the umask do its job, don't try to be more
220 * restrictive except to remove write permission.
221 */
222 int mode = 0444;
223 snprintf(template, limit, "%s/%s",
224 get_object_directory(), pattern);
225 fd = git_mkstemp_mode(template, mode);
226 if (0 <= fd)
227 return fd;
228
229 /* slow path */
230 /* some mkstemp implementations erase template on failure */
231 snprintf(template, limit, "%s/%s",
232 get_object_directory(), pattern);
233 safe_create_leading_directories(template);
234 return xmkstemp_mode(template, mode);
235}
236
8640d496 237int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1)
463db9b1
JN
238{
239 int fd;
240
241 snprintf(name, namesz, "%s/pack/pack-%s.keep",
242 get_object_directory(), sha1_to_hex(sha1));
243 fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
244 if (0 <= fd)
245 return fd;
246
247 /* slow path */
248 safe_create_leading_directories(name);
249 return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
250}
251
e1b10391
LT
252char *get_index_file(void)
253{
254 if (!git_index_file)
255 setup_git_env();
256 return git_index_file;
257}
258
259char *get_graft_file(void)
260{
261 if (!git_graft_file)
262 setup_git_env();
263 return git_graft_file;
264}
d7ac12b2
JS
265
266int set_git_dir(const char *path)
267{
268 if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
269 return error("Could not set GIT_DIR to '%s'", path);
270 setup_git_env();
271 return 0;
272}
a6fa5992
PN
273
274const char *get_log_output_encoding(void)
275{
276 return git_log_output_encoding ? git_log_output_encoding
277 : get_commit_output_encoding();
278}
279
280const char *get_commit_output_encoding(void)
281{
282 return git_commit_encoding ? git_commit_encoding : "UTF-8";
283}