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![Jeff King](/assets/img/avatar_default.png)
Our handling of alternate object directories is needlessly different from the main object directory. As a result, many places in the code basically look like this: do_something(r->objects->objdir); for (odb = r->objects->alt_odb_list; odb; odb = odb->next) do_something(odb->path); That gets annoying when do_something() is non-trivial, and we've resorted to gross hacks like creating fake alternates (see find_short_object_filename()). Instead, let's give each raw_object_store a unified list of object_directory structs. The first will be the main store, and everything after is an alternate. Very few callers even care about the distinction, and can just loop over the whole list (and those who care can just treat the first element differently). A few observations: - we don't need r->objects->objectdir anymore, and can just mechanically convert that to r->objects->odb->path - object_directory's path field needs to become a real pointer rather than a FLEX_ARRAY, in order to fill it with expand_base_dir() - we'll call prepare_alt_odb() earlier in many functions (i.e., outside of the loop). This may result in us calling it even when our function would be satisfied looking only at the main odb. But this doesn't matter in practice. It's not a very expensive operation in the first place, and in the majority of cases it will be a noop. We call it already (and cache its results) in prepare_packed_git(), and we'll generally check packs before loose objects. So essentially every program is going to call it immediately once per program. Arguably we should just prepare_alt_odb() immediately upon setting up the repository's object directory, which would save us sprinkling calls throughout the code base (and forgetting to do so has been a source of subtle bugs in the past). But I've stopped short of that here, since there are already a lot of other moving parts in this patch. - Most call sites just get shorter. The check_and_freshen() functions are an exception, because they have entry points to handle local and nonlocal directories separately. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
412 lines
11 KiB
C
412 lines
11 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 "branch.h"
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#include "repository.h"
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#include "config.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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#include "argv-array.h"
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#include "object-store.h"
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#include "chdir-notify.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 = -1;
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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 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_precious_objects;
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char *repository_format_partial_clone;
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const char *core_partial_clone_filter_default;
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const char *git_commit_encoding;
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const char *git_log_output_encoding;
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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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const char *git_hooks_path;
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int zlib_compression_level = Z_BEST_SPEED;
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int core_compression_level;
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int pack_compression_level = Z_DEFAULT_COMPRESSION;
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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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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 read_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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int global_conv_flags_eol = CONV_EOL_RNDTRP_WARN;
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char *check_roundtrip_encoding = "SHIFT-JIS";
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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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enum hide_dotfiles_type hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
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enum log_refs_config log_all_ref_updates = LOG_REFS_UNSET;
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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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const char *core_fsmonitor;
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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 *git_namespace;
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static const char *super_prefix;
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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_SUPER_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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/*
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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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static const char *getenv_safe(struct argv_array *argv, const char *name)
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{
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const char *value = getenv(name);
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if (!value)
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return NULL;
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argv_array_push(argv, value);
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return argv->argv[argv->argc - 1];
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}
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void setup_git_env(const char *git_dir)
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{
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const char *shallow_file;
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const char *replace_ref_base;
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struct set_gitdir_args args = { NULL };
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struct argv_array to_free = ARGV_ARRAY_INIT;
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args.commondir = getenv_safe(&to_free, GIT_COMMON_DIR_ENVIRONMENT);
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args.object_dir = getenv_safe(&to_free, DB_ENVIRONMENT);
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args.graft_file = getenv_safe(&to_free, GRAFT_ENVIRONMENT);
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args.index_file = getenv_safe(&to_free, INDEX_ENVIRONMENT);
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args.alternate_db = getenv_safe(&to_free, ALTERNATE_DB_ENVIRONMENT);
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repo_set_gitdir(the_repository, git_dir, &args);
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argv_array_clear(&to_free);
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if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
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read_replace_refs = 0;
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replace_ref_base = getenv(GIT_REPLACE_REF_BASE_ENVIRONMENT);
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free(git_replace_ref_base);
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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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free(git_namespace);
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git_namespace = expand_namespace(getenv(GIT_NAMESPACE_ENVIRONMENT));
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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(the_repository, 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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int have_git_dir(void)
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{
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return startup_info->have_repository
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|| the_repository->gitdir;
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}
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const char *get_git_dir(void)
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{
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if (!the_repository->gitdir)
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BUG("git environment hasn't been setup");
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return the_repository->gitdir;
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}
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const char *get_git_common_dir(void)
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{
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if (!the_repository->commondir)
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BUG("git environment hasn't been setup");
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return the_repository->commondir;
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}
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const char *get_git_namespace(void)
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{
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if (!git_namespace)
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BUG("git environment hasn't been setup");
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return git_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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const char *out;
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if (skip_prefix(namespaced_ref, get_git_namespace(), &out))
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return out;
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return NULL;
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}
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const char *get_super_prefix(void)
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{
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static int initialized;
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if (!initialized) {
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super_prefix = getenv(GIT_SUPER_PREFIX_ENVIRONMENT);
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initialized = 1;
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}
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return super_prefix;
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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, the_repository->worktree))
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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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the_repository->worktree, 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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repo_set_worktree(the_repository, 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 the_repository->worktree;
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}
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char *get_object_directory(void)
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{
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if (!the_repository->objects->odb)
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BUG("git environment hasn't been setup");
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return the_repository->objects->odb->path;
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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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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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git_path_buf(temp_filename, "objects/%s", pattern);
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fd = git_mkstemp_mode(temp_filename->buf, 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 temp_filename on failure */
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git_path_buf(temp_filename, "objects/%s", pattern);
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safe_create_leading_directories(temp_filename->buf);
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return xmkstemp_mode(temp_filename->buf, mode);
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}
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int odb_pack_keep(const char *name)
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{
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int fd;
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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_const(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 (!the_repository->index_file)
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BUG("git environment hasn't been setup");
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return the_repository->index_file;
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}
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char *get_graft_file(struct repository *r)
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{
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if (!r->graft_file)
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BUG("git environment hasn't been setup");
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return r->graft_file;
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}
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static void set_git_dir_1(const char *path)
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{
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if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
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die(_("could not set GIT_DIR to '%s'"), path);
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setup_git_env(path);
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}
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static void update_relative_gitdir(const char *name,
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const char *old_cwd,
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const char *new_cwd,
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void *data)
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{
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char *path = reparent_relative_path(old_cwd, new_cwd, get_git_dir());
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trace_printf_key(&trace_setup_key,
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"setup: move $GIT_DIR to '%s'",
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path);
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set_git_dir_1(path);
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free(path);
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}
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void set_git_dir(const char *path)
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{
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set_git_dir_1(path);
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if (!is_absolute_path(path))
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chdir_notify_register(NULL, update_relative_gitdir, NULL);
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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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static int the_shared_repository = PERM_UMASK;
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static int need_shared_repository_from_config = 1;
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void set_shared_repository(int value)
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{
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the_shared_repository = value;
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need_shared_repository_from_config = 0;
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}
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int get_shared_repository(void)
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{
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if (need_shared_repository_from_config) {
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const char *var = "core.sharedrepository";
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const char *value;
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if (!git_config_get_value(var, &value))
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the_shared_repository = git_config_perm(var, value);
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need_shared_repository_from_config = 0;
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}
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return the_shared_repository;
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}
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void reset_shared_repository(void)
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{
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need_shared_repository_from_config = 1;
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}
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int use_optional_locks(void)
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{
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return git_env_bool(GIT_OPTIONAL_LOCKS_ENVIRONMENT, 1);
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}
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int print_sha1_ellipsis(void)
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{
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/*
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* Determine if the calling environment contains the variable
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* GIT_PRINT_SHA1_ELLIPSIS set to "yes".
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*/
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static int cached_result = -1; /* unknown */
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if (cached_result < 0) {
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const char *v = getenv("GIT_PRINT_SHA1_ELLIPSIS");
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cached_result = (v && !strcasecmp(v, "yes"));
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}
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return cached_result;
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}
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