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https://github.com/git/git
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be20128bfa
Most of our tree traversal algorithms use recursion to visit sub-trees. For pathologically large trees, this can cause us to run out of stack space and abort in an uncontrolled way. Let's put our own limit here so that we can fail gracefully rather than segfaulting. In similar cases where we recursed along the commit graph, we rewrote the algorithms to avoid recursion and keep any stack data on the heap. But the commit graph is meant to grow without bound, whereas it's not an imposition to put a limit on the maximum size of tree we'll handle. And this has a bonus side effect: coupled with a limit on individual tree entry names, this limits the total size of a path we may encounter. This gives us an extra protection against code handling long path names which may suffer from integer overflows in the size (which could then be exploited by malicious trees). The default of 4096 is set to be much longer than anybody would care about in the real world. Even with single-letter interior tree names (like "a/b/c"), such a path is at least 8191 bytes. While most operating systems will let you create such a path incrementally, trying to reference the whole thing in a system call (as Git would do when actually trying to access it) will result in ENAMETOOLONG. Coupled with the recent fsck.largePathname warning, the maximum total pathname Git will handle is (by default) 16MB. This config option doesn't do anything yet; future patches will convert various algorithms to respect the limit. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
232 lines
7.6 KiB
C
232 lines
7.6 KiB
C
#ifndef ENVIRONMENT_H
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#define ENVIRONMENT_H
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struct repository;
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struct strvec;
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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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extern char comment_line_char;
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extern int auto_comment_line_char;
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/*
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* Wrapper of getenv() that returns a strdup value. This value is kept
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* in argv to be freed later.
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*/
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const char *getenv_safe(struct strvec *argv, const char *name);
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/* Double-check local_repo_env below if you add to this list. */
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#define GIT_DIR_ENVIRONMENT "GIT_DIR"
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#define GIT_COMMON_DIR_ENVIRONMENT "GIT_COMMON_DIR"
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#define GIT_NAMESPACE_ENVIRONMENT "GIT_NAMESPACE"
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#define GIT_WORK_TREE_ENVIRONMENT "GIT_WORK_TREE"
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#define GIT_PREFIX_ENVIRONMENT "GIT_PREFIX"
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#define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
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#define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
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#define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
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#define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
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#define GIT_SHALLOW_FILE_ENVIRONMENT "GIT_SHALLOW_FILE"
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#define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
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#define CONFIG_ENVIRONMENT "GIT_CONFIG"
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#define CONFIG_DATA_ENVIRONMENT "GIT_CONFIG_PARAMETERS"
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#define CONFIG_COUNT_ENVIRONMENT "GIT_CONFIG_COUNT"
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#define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
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#define CEILING_DIRECTORIES_ENVIRONMENT "GIT_CEILING_DIRECTORIES"
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#define NO_REPLACE_OBJECTS_ENVIRONMENT "GIT_NO_REPLACE_OBJECTS"
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#define GIT_REPLACE_REF_BASE_ENVIRONMENT "GIT_REPLACE_REF_BASE"
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#define GITATTRIBUTES_FILE ".gitattributes"
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#define INFOATTRIBUTES_FILE "info/attributes"
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#define ATTRIBUTE_MACRO_PREFIX "[attr]"
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#define GITMODULES_FILE ".gitmodules"
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#define GITMODULES_INDEX ":.gitmodules"
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#define GITMODULES_HEAD "HEAD:.gitmodules"
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#define GIT_NOTES_REF_ENVIRONMENT "GIT_NOTES_REF"
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#define GIT_NOTES_DEFAULT_REF "refs/notes/commits"
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#define GIT_NOTES_DISPLAY_REF_ENVIRONMENT "GIT_NOTES_DISPLAY_REF"
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#define GIT_NOTES_REWRITE_REF_ENVIRONMENT "GIT_NOTES_REWRITE_REF"
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#define GIT_NOTES_REWRITE_MODE_ENVIRONMENT "GIT_NOTES_REWRITE_MODE"
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#define GIT_LITERAL_PATHSPECS_ENVIRONMENT "GIT_LITERAL_PATHSPECS"
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#define GIT_GLOB_PATHSPECS_ENVIRONMENT "GIT_GLOB_PATHSPECS"
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#define GIT_NOGLOB_PATHSPECS_ENVIRONMENT "GIT_NOGLOB_PATHSPECS"
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#define GIT_ICASE_PATHSPECS_ENVIRONMENT "GIT_ICASE_PATHSPECS"
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#define GIT_QUARANTINE_ENVIRONMENT "GIT_QUARANTINE_PATH"
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#define GIT_OPTIONAL_LOCKS_ENVIRONMENT "GIT_OPTIONAL_LOCKS"
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#define GIT_TEXT_DOMAIN_DIR_ENVIRONMENT "GIT_TEXTDOMAINDIR"
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#define GIT_ATTR_SOURCE_ENVIRONMENT "GIT_ATTR_SOURCE"
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/*
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* Environment variable used in handshaking the wire protocol.
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* Contains a colon ':' separated list of keys with optional values
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* 'key[=value]'. Presence of unknown keys and values must be
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* ignored.
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*/
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#define GIT_PROTOCOL_ENVIRONMENT "GIT_PROTOCOL"
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/* HTTP header used to handshake the wire protocol */
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#define GIT_PROTOCOL_HEADER "Git-Protocol"
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/*
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* This environment variable is expected to contain a boolean indicating
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* whether we should or should not treat:
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*
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* GIT_DIR=foo.git git ...
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*
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* as if GIT_WORK_TREE=. was given. It's not expected that users will make use
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* of this, but we use it internally to communicate to sub-processes that we
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* are in a bare repo. If not set, defaults to true.
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*/
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#define GIT_IMPLICIT_WORK_TREE_ENVIRONMENT "GIT_IMPLICIT_WORK_TREE"
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/*
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* Repository-local GIT_* environment variables; these will be cleared
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* when git spawns a sub-process that runs inside another repository.
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* The array is NULL-terminated, which makes it easy to pass in the "env"
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* parameter of a run-command invocation, or to do a simple walk.
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*/
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extern const char * const local_repo_env[];
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void setup_git_env(const char *git_dir);
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/*
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* Returns true iff we have a configured git repository (either via
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* setup_git_directory, or in the environment via $GIT_DIR).
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*/
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int have_git_dir(void);
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extern int is_bare_repository_cfg;
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int is_bare_repository(void);
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extern char *git_work_tree_cfg;
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const char *get_git_dir(void);
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const char *get_git_common_dir(void);
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const char *get_object_directory(void);
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char *get_index_file(void);
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char *get_graft_file(struct repository *r);
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void set_git_dir(const char *path, int make_realpath);
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const char *get_git_namespace(void);
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const char *strip_namespace(const char *namespaced_ref);
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const char *get_git_work_tree(void);
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void set_git_work_tree(const char *tree);
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#define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
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/* Environment bits from configuration mechanism */
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extern int trust_executable_bit;
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extern int trust_ctime;
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extern int check_stat;
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extern int has_symlinks;
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extern int minimum_abbrev, default_abbrev;
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extern int ignore_case;
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extern int assume_unchanged;
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extern int prefer_symlink_refs;
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extern int warn_ambiguous_refs;
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extern int warn_on_object_refname_ambiguity;
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extern char *apply_default_whitespace;
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extern char *apply_default_ignorewhitespace;
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extern const char *git_attributes_file;
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extern const char *git_hooks_path;
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extern int zlib_compression_level;
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extern int pack_compression_level;
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extern size_t packed_git_window_size;
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extern size_t packed_git_limit;
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extern size_t delta_base_cache_limit;
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extern unsigned long big_file_threshold;
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extern unsigned long pack_size_limit_cfg;
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extern int max_allowed_tree_depth;
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/*
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* Accessors for the core.sharedrepository config which lazy-load the value
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* from the config (if not already set). The "reset" function can be
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* used to unset "set" or cached value, meaning that the value will be loaded
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* fresh from the config file on the next call to get_shared_repository().
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*/
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void set_shared_repository(int value);
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int get_shared_repository(void);
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void reset_shared_repository(void);
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extern int core_preload_index;
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extern int precomposed_unicode;
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extern int protect_hfs;
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extern int protect_ntfs;
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extern int core_apply_sparse_checkout;
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extern int core_sparse_checkout_cone;
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extern int sparse_expect_files_outside_of_patterns;
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/*
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* Returns the boolean value of $GIT_OPTIONAL_LOCKS (or the default value).
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*/
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int use_optional_locks(void);
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enum log_refs_config {
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LOG_REFS_UNSET = -1,
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LOG_REFS_NONE = 0,
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LOG_REFS_NORMAL,
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LOG_REFS_ALWAYS
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};
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extern enum log_refs_config log_all_ref_updates;
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enum rebase_setup_type {
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AUTOREBASE_NEVER = 0,
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AUTOREBASE_LOCAL,
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AUTOREBASE_REMOTE,
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AUTOREBASE_ALWAYS
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};
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enum push_default_type {
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PUSH_DEFAULT_NOTHING = 0,
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PUSH_DEFAULT_MATCHING,
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PUSH_DEFAULT_SIMPLE,
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PUSH_DEFAULT_UPSTREAM,
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PUSH_DEFAULT_CURRENT,
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PUSH_DEFAULT_UNSPECIFIED
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};
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extern enum rebase_setup_type autorebase;
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extern enum push_default_type push_default;
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enum object_creation_mode {
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OBJECT_CREATION_USES_HARDLINKS = 0,
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OBJECT_CREATION_USES_RENAMES = 1
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};
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extern enum object_creation_mode object_creation_mode;
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extern char *notes_ref_name;
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extern int grafts_keep_true_parents;
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extern int repository_format_precious_objects;
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/*
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* Create a temporary file rooted in the object database directory, or
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* die on failure. The filename is taken from "pattern", which should have the
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* usual "XXXXXX" trailer, and the resulting filename is written into the
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* "template" buffer. Returns the open descriptor.
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*/
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int odb_mkstemp(struct strbuf *temp_filename, const char *pattern);
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/*
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* Create a pack .keep file named "name" (which should generally be the output
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* of odb_pack_name). Returns a file descriptor opened for writing, or -1 on
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* error.
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*/
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int odb_pack_keep(const char *name);
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const char *get_log_output_encoding(void);
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const char *get_commit_output_encoding(void);
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extern const char *git_commit_encoding;
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extern const char *git_log_output_encoding;
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extern const char *editor_program;
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extern const char *askpass_program;
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extern const char *excludes_file;
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/*
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* Should we print an ellipsis after an abbreviated SHA-1 value
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* when doing diff-raw output or indicating a detached HEAD?
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*/
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int print_sha1_ellipsis(void);
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#endif
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