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![Jeff King](/assets/img/avatar_default.png)
Commit a60645f
(setup: remember whether repository was
found, 2010-08-05) introduced the startup_info structure,
which records some parts of the setup_git_directory()
process (notably, whether we actually found a repository or
not).
One of the uses of this data is for functions to behave
appropriately based on whether we are in a repo. But the
startup_info struct is just a pointer to storage provided by
the main program, and the only program that sets it up is
the git.c wrapper. Thus builtins have access to
startup_info, but externally linked programs do not.
Worse, library code which is accessible from both has to be
careful about accessing startup_info. This can be used to
trigger a die("BUG") via get_sha1():
$ git fast-import <<-\EOF
tag foo
from HEAD:./whatever
EOF
fatal: BUG: startup_info struct is not initialized.
Obviously that's fairly nonsensical input to feed to
fast-import, but we should never hit a die("BUG"). And there
may be other ways to trigger it if other non-builtins
resolve sha1s.
So let's point the storage for startup_info to a static
variable in setup.c, making it available to all users of the
library code. We _could_ turn startup_info into a regular
extern struct, but doing so would mean tweaking all of the
existing use sites. So let's leave the pointer indirection
in place. We can, however, drop any checks for NULL, as
they will always be false (and likewise, we can drop the
test covering this case, which was a rather artificial
situation using one of the test-* programs).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
327 lines
8.7 KiB
C
327 lines
8.7 KiB
C
/*
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* We put all the git config variables in this same object
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* file, so that programs can link against the config parser
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* without having to link against all the rest of git.
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*
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* In particular, no need to bring in libz etc unless needed,
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* even if you might want to know where the git directory etc
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* are.
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*/
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#include "cache.h"
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#include "refs.h"
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#include "fmt-merge-msg.h"
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#include "commit.h"
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int trust_executable_bit = 1;
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int trust_ctime = 1;
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int check_stat = 1;
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int has_symlinks = 1;
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int minimum_abbrev = 4, default_abbrev = 7;
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int ignore_case;
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int assume_unchanged;
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int prefer_symlink_refs;
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int is_bare_repository_cfg = -1; /* unspecified */
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int log_all_ref_updates = -1; /* unspecified */
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int warn_ambiguous_refs = 1;
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int warn_on_object_refname_ambiguity = 1;
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int ref_paranoia = -1;
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int repository_format_version;
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int repository_format_precious_objects;
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const char *git_commit_encoding;
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const char *git_log_output_encoding;
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int shared_repository = PERM_UMASK;
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const char *apply_default_whitespace;
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const char *apply_default_ignorewhitespace;
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const char *git_attributes_file;
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int zlib_compression_level = Z_BEST_SPEED;
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int core_compression_level;
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int core_compression_seen;
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int fsync_object_files;
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size_t packed_git_window_size = DEFAULT_PACKED_GIT_WINDOW_SIZE;
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size_t packed_git_limit = DEFAULT_PACKED_GIT_LIMIT;
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size_t delta_base_cache_limit = 96 * 1024 * 1024;
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unsigned long big_file_threshold = 512 * 1024 * 1024;
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const char *pager_program;
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int pager_use_color = 1;
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const char *editor_program;
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const char *askpass_program;
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const char *excludes_file;
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enum auto_crlf auto_crlf = AUTO_CRLF_FALSE;
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int check_replace_refs = 1;
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char *git_replace_ref_base;
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enum eol core_eol = EOL_UNSET;
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enum safe_crlf safe_crlf = SAFE_CRLF_WARN;
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unsigned whitespace_rule_cfg = WS_DEFAULT_RULE;
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enum branch_track git_branch_track = BRANCH_TRACK_REMOTE;
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enum rebase_setup_type autorebase = AUTOREBASE_NEVER;
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enum push_default_type push_default = PUSH_DEFAULT_UNSPECIFIED;
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#ifndef OBJECT_CREATION_MODE
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#define OBJECT_CREATION_MODE OBJECT_CREATION_USES_HARDLINKS
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#endif
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enum object_creation_mode object_creation_mode = OBJECT_CREATION_MODE;
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char *notes_ref_name;
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int grafts_replace_parents = 1;
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int core_apply_sparse_checkout;
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int merge_log_config = -1;
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int precomposed_unicode = -1; /* see probe_utf8_pathname_composition() */
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unsigned long pack_size_limit_cfg;
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#ifndef PROTECT_HFS_DEFAULT
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#define PROTECT_HFS_DEFAULT 0
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#endif
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int protect_hfs = PROTECT_HFS_DEFAULT;
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#ifndef PROTECT_NTFS_DEFAULT
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#define PROTECT_NTFS_DEFAULT 0
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#endif
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int protect_ntfs = PROTECT_NTFS_DEFAULT;
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/*
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* The character that begins a commented line in user-editable file
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* that is subject to stripspace.
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*/
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char comment_line_char = '#';
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int auto_comment_line_char;
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/* Parallel index stat data preload? */
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int core_preload_index = 1;
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/*
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* This is a hack for test programs like test-dump-untracked-cache to
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* ensure that they do not modify the untracked cache when reading it.
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* Do not use it otherwise!
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*/
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int ignore_untracked_cache_config;
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/* This is set by setup_git_dir_gently() and/or git_default_config() */
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char *git_work_tree_cfg;
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static char *work_tree;
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static const char *namespace;
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static size_t namespace_len;
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static const char *git_dir, *git_common_dir;
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static char *git_object_dir, *git_index_file, *git_graft_file;
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int git_db_env, git_index_env, git_graft_env, git_common_dir_env;
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/*
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* Repository-local GIT_* environment variables; see cache.h for details.
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*/
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const char * const local_repo_env[] = {
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ALTERNATE_DB_ENVIRONMENT,
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CONFIG_ENVIRONMENT,
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CONFIG_DATA_ENVIRONMENT,
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DB_ENVIRONMENT,
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GIT_DIR_ENVIRONMENT,
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GIT_WORK_TREE_ENVIRONMENT,
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GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,
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GRAFT_ENVIRONMENT,
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INDEX_ENVIRONMENT,
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NO_REPLACE_OBJECTS_ENVIRONMENT,
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GIT_REPLACE_REF_BASE_ENVIRONMENT,
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GIT_PREFIX_ENVIRONMENT,
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GIT_SHALLOW_FILE_ENVIRONMENT,
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GIT_COMMON_DIR_ENVIRONMENT,
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NULL
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};
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static char *expand_namespace(const char *raw_namespace)
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{
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struct strbuf buf = STRBUF_INIT;
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struct strbuf **components, **c;
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if (!raw_namespace || !*raw_namespace)
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return xstrdup("");
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strbuf_addstr(&buf, raw_namespace);
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components = strbuf_split(&buf, '/');
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strbuf_reset(&buf);
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for (c = components; *c; c++)
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if (strcmp((*c)->buf, "/") != 0)
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strbuf_addf(&buf, "refs/namespaces/%s", (*c)->buf);
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strbuf_list_free(components);
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if (check_refname_format(buf.buf, 0))
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die("bad git namespace path \"%s\"", raw_namespace);
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strbuf_addch(&buf, '/');
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return strbuf_detach(&buf, NULL);
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}
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static char *git_path_from_env(const char *envvar, const char *git_dir,
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const char *path, int *fromenv)
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{
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const char *value = getenv(envvar);
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if (!value)
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return xstrfmt("%s/%s", git_dir, path);
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if (fromenv)
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*fromenv = 1;
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return xstrdup(value);
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}
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static void setup_git_env(void)
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{
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struct strbuf sb = STRBUF_INIT;
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const char *gitfile;
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const char *shallow_file;
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const char *replace_ref_base;
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git_dir = getenv(GIT_DIR_ENVIRONMENT);
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if (!git_dir)
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git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
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gitfile = read_gitfile(git_dir);
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git_dir = xstrdup(gitfile ? gitfile : git_dir);
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if (get_common_dir(&sb, git_dir))
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git_common_dir_env = 1;
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git_common_dir = strbuf_detach(&sb, NULL);
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git_object_dir = git_path_from_env(DB_ENVIRONMENT, git_common_dir,
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"objects", &git_db_env);
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git_index_file = git_path_from_env(INDEX_ENVIRONMENT, git_dir,
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"index", &git_index_env);
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git_graft_file = git_path_from_env(GRAFT_ENVIRONMENT, git_common_dir,
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"info/grafts", &git_graft_env);
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if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
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check_replace_refs = 0;
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replace_ref_base = getenv(GIT_REPLACE_REF_BASE_ENVIRONMENT);
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git_replace_ref_base = xstrdup(replace_ref_base ? replace_ref_base
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: "refs/replace/");
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namespace = expand_namespace(getenv(GIT_NAMESPACE_ENVIRONMENT));
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namespace_len = strlen(namespace);
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shallow_file = getenv(GIT_SHALLOW_FILE_ENVIRONMENT);
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if (shallow_file)
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set_alternate_shallow_file(shallow_file, 0);
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}
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int is_bare_repository(void)
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{
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/* if core.bare is not 'false', let's see if there is a work tree */
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return is_bare_repository_cfg && !get_git_work_tree();
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}
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const char *get_git_dir(void)
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{
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if (!git_dir)
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setup_git_env();
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return git_dir;
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}
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const char *get_git_common_dir(void)
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{
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return git_common_dir;
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}
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const char *get_git_namespace(void)
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{
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if (!namespace)
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setup_git_env();
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return namespace;
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}
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const char *strip_namespace(const char *namespaced_ref)
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{
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if (!starts_with(namespaced_ref, get_git_namespace()))
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return NULL;
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return namespaced_ref + namespace_len;
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}
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static int git_work_tree_initialized;
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/*
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* Note. This works only before you used a work tree. This was added
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* primarily to support git-clone to work in a new repository it just
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* created, and is not meant to flip between different work trees.
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*/
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void set_git_work_tree(const char *new_work_tree)
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{
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if (git_work_tree_initialized) {
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new_work_tree = real_path(new_work_tree);
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if (strcmp(new_work_tree, work_tree))
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die("internal error: work tree has already been set\n"
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"Current worktree: %s\nNew worktree: %s",
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work_tree, new_work_tree);
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return;
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}
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git_work_tree_initialized = 1;
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work_tree = xstrdup(real_path(new_work_tree));
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}
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const char *get_git_work_tree(void)
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{
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return work_tree;
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}
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char *get_object_directory(void)
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{
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if (!git_object_dir)
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setup_git_env();
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return git_object_dir;
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}
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int odb_mkstemp(char *template, size_t limit, const char *pattern)
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{
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int fd;
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/*
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* we let the umask do its job, don't try to be more
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* restrictive except to remove write permission.
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*/
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int mode = 0444;
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snprintf(template, limit, "%s/%s",
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get_object_directory(), pattern);
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fd = git_mkstemp_mode(template, mode);
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if (0 <= fd)
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return fd;
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/* slow path */
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/* some mkstemp implementations erase template on failure */
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snprintf(template, limit, "%s/%s",
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get_object_directory(), pattern);
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safe_create_leading_directories(template);
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return xmkstemp_mode(template, mode);
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}
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int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1)
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{
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int fd;
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snprintf(name, namesz, "%s/pack/pack-%s.keep",
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get_object_directory(), sha1_to_hex(sha1));
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fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
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if (0 <= fd)
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return fd;
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/* slow path */
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safe_create_leading_directories(name);
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return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
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}
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char *get_index_file(void)
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{
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if (!git_index_file)
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setup_git_env();
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return git_index_file;
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}
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char *get_graft_file(void)
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{
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if (!git_graft_file)
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setup_git_env();
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return git_graft_file;
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}
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int set_git_dir(const char *path)
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{
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if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
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return error("Could not set GIT_DIR to '%s'", path);
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setup_git_env();
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return 0;
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}
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const char *get_log_output_encoding(void)
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{
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return git_log_output_encoding ? git_log_output_encoding
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: get_commit_output_encoding();
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}
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const char *get_commit_output_encoding(void)
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{
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return git_commit_encoding ? git_commit_encoding : "UTF-8";
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}
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