environment.c

   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
  11 #define USE_THE_REPOSITORY_VARIABLE
  12
  13 #include "git-compat-util.h"
  14 #include "abspath.h"
  15 #include "branch.h"
  16 #include "convert.h"
  17 #include "environment.h"
  18 #include "gettext.h"
  19 #include "git-zlib.h"
  20 #include "repository.h"
  21 #include "config.h"
  22 #include "refs.h"
  23 #include "fmt-merge-msg.h"
  24 #include "commit.h"
  25 #include "strvec.h"
  26 #include "path.h"
  27 #include "chdir-notify.h"
  28 #include "setup.h"
  29 #include "write-or-die.h"
  30
  31 int trust_executable_bit = 1;
  32 int trust_ctime = 1;
  33 int check_stat = 1;
  34 int has_symlinks = 1;
  35 int minimum_abbrev = 4, default_abbrev = -1;
  36 int ignore_case;
  37 int assume_unchanged;
  38 int is_bare_repository_cfg = -1; /* unspecified */
  39 int warn_on_object_refname_ambiguity = 1;
  40 int repository_format_precious_objects;
  41 char *git_commit_encoding;
  42 char *git_log_output_encoding;
  43 char *apply_default_whitespace;
  44 char *apply_default_ignorewhitespace;
  45 char *git_attributes_file;
  46 int zlib_compression_level = Z_BEST_SPEED;
  47 int pack_compression_level = Z_DEFAULT_COMPRESSION;
  48 int fsync_object_files = -1;
  49 int use_fsync = -1;
  50 enum fsync_method fsync_method = FSYNC_METHOD_DEFAULT;
  51 enum fsync_component fsync_components = FSYNC_COMPONENTS_DEFAULT;
  52 char *editor_program;
  53 char *askpass_program;
  54 char *excludes_file;
  55 enum auto_crlf auto_crlf = AUTO_CRLF_FALSE;
  56 enum eol core_eol = EOL_UNSET;
  57 int global_conv_flags_eol = CONV_EOL_RNDTRP_WARN;
  58 char *check_roundtrip_encoding;
  59 enum branch_track git_branch_track = BRANCH_TRACK_REMOTE;
  60 enum rebase_setup_type autorebase = AUTOREBASE_NEVER;
  61 enum push_default_type push_default = PUSH_DEFAULT_UNSPECIFIED;
  62 #ifndef OBJECT_CREATION_MODE
  63 #define OBJECT_CREATION_MODE OBJECT_CREATION_USES_HARDLINKS
  64 #endif
  65 enum object_creation_mode object_creation_mode = OBJECT_CREATION_MODE;
  66 int grafts_keep_true_parents;
  67 int core_apply_sparse_checkout;
  68 int core_sparse_checkout_cone;
  69 int sparse_expect_files_outside_of_patterns;
  70 int merge_log_config = -1;
  71 int precomposed_unicode = -1; /* see probe_utf8_pathname_composition() */
  72 unsigned long pack_size_limit_cfg;
  73 int max_allowed_tree_depth =
  74 #ifdef _MSC_VER
  75         /*
  76          * When traversing into too-deep trees, Visual C-compiled Git seems to
  77          * run into some internal stack overflow detection in the
  78          * `RtlpAllocateHeap()` function that is called from within
  79          * `git_inflate_init()`'s call tree. The following value seems to be
  80          * low enough to avoid that by letting Git exit with an error before
  81          * the stack overflow can occur.
  82          */
  83         512;
  84 #elif defined(GIT_WINDOWS_NATIVE) && defined(__clang__) && defined(__aarch64__)
  85         /*
  86          * Similar to Visual C, it seems that on Windows/ARM64 the clang-based
  87          * builds have a smaller stack space available. When running out of
  88          * that stack space, a `STATUS_STACK_OVERFLOW` is produced. When the
  89          * Git command was run from an MSYS2 Bash, this unfortunately results
  90          * in an exit code 127. Let's prevent that by lowering the maximal
  91          * tree depth; This value seems to be low enough.
  92          */
  93         1280;
  94 #else
  95         2048;
  96 #endif
  97
  98 #ifndef PROTECT_HFS_DEFAULT
  99 #define PROTECT_HFS_DEFAULT 0
 100 #endif
 101 int protect_hfs = PROTECT_HFS_DEFAULT;
 102
 103 #ifndef PROTECT_NTFS_DEFAULT
 104 #define PROTECT_NTFS_DEFAULT 1
 105 #endif
 106 int protect_ntfs = PROTECT_NTFS_DEFAULT;
 107
 108 /*
 109  * The character that begins a commented line in user-editable file
 110  * that is subject to stripspace.
 111  */
 112 const char *comment_line_str = "#";
 113 char *comment_line_str_to_free;
 114 int auto_comment_line_char;
 115
 116 /* This is set by setup_git_directory_gently() and/or git_default_config() */
 117 char *git_work_tree_cfg;
 118
 119 /*
 120  * Repository-local GIT_* environment variables; see environment.h for details.
 121  */
 122 const char * const local_repo_env[] = {
 123         ALTERNATE_DB_ENVIRONMENT,
 124         CONFIG_ENVIRONMENT,
 125         CONFIG_DATA_ENVIRONMENT,
 126         CONFIG_COUNT_ENVIRONMENT,
 127         DB_ENVIRONMENT,
 128         GIT_DIR_ENVIRONMENT,
 129         GIT_WORK_TREE_ENVIRONMENT,
 130         GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,
 131         GRAFT_ENVIRONMENT,
 132         INDEX_ENVIRONMENT,
 133         NO_REPLACE_OBJECTS_ENVIRONMENT,
 134         GIT_REPLACE_REF_BASE_ENVIRONMENT,
 135         GIT_PREFIX_ENVIRONMENT,
 136         GIT_SHALLOW_FILE_ENVIRONMENT,
 137         GIT_COMMON_DIR_ENVIRONMENT,
 138         NULL
 139 };
 140
 141 const char *getenv_safe(struct strvec *argv, const char *name)
 142 {
 143         const char *value = getenv(name);
 144
 145         if (!value)
 146                 return NULL;
 147
 148         strvec_push(argv, value);
 149         return argv->v[argv->nr - 1];
 150 }
 151
 152 int is_bare_repository(void)
 153 {
 154         /* if core.bare is not 'false', let's see if there is a work tree */
 155         return is_bare_repository_cfg && !repo_get_work_tree(the_repository);
 156 }
 157
 158 int have_git_dir(void)
 159 {
 160         return startup_info->have_repository
 161                 || the_repository->gitdir;
 162 }
 163
 164 const char *get_git_namespace(void)
 165 {
 166         static const char *namespace;
 167
 168         struct strbuf buf = STRBUF_INIT;
 169         struct strbuf **components, **c;
 170         const char *raw_namespace;
 171
 172         if (namespace)
 173                 return namespace;
 174
 175         raw_namespace = getenv(GIT_NAMESPACE_ENVIRONMENT);
 176         if (!raw_namespace || !*raw_namespace) {
 177                 namespace = "";
 178                 return namespace;
 179         }
 180
 181         strbuf_addstr(&buf, raw_namespace);
 182         components = strbuf_split(&buf, '/');
 183         strbuf_reset(&buf);
 184         for (c = components; *c; c++)
 185                 if (strcmp((*c)->buf, "/") != 0)
 186                         strbuf_addf(&buf, "refs/namespaces/%s", (*c)->buf);
 187         strbuf_list_free(components);
 188         if (check_refname_format(buf.buf, 0))
 189                 die(_("bad git namespace path \"%s\""), raw_namespace);
 190         strbuf_addch(&buf, '/');
 191
 192         namespace = strbuf_detach(&buf, NULL);
 193
 194         return namespace;
 195 }
 196
 197 const char *strip_namespace(const char *namespaced_ref)
 198 {
 199         const char *out;
 200         if (skip_prefix(namespaced_ref, get_git_namespace(), &out))
 201                 return out;
 202         return NULL;
 203 }
 204
 205 const char *get_log_output_encoding(void)
 206 {
 207         return git_log_output_encoding ? git_log_output_encoding
 208                 : get_commit_output_encoding();
 209 }
 210
 211 const char *get_commit_output_encoding(void)
 212 {
 213         return git_commit_encoding ? git_commit_encoding : "UTF-8";
 214 }
 215
 216 int use_optional_locks(void)
 217 {
 218         return git_env_bool(GIT_OPTIONAL_LOCKS_ENVIRONMENT, 1);
 219 }
 220
 221 int print_sha1_ellipsis(void)
 222 {
 223         /*
 224          * Determine if the calling environment contains the variable
 225          * GIT_PRINT_SHA1_ELLIPSIS set to "yes".
 226          */
 227         static int cached_result = -1; /* unknown */
 228
 229         if (cached_result < 0) {
 230                 const char *v = getenv("GIT_PRINT_SHA1_ELLIPSIS");
 231                 cached_result = (v && !strcasecmp(v, "yes"));
 232         }
 233         return cached_result;
 234 }