diff options
Diffstat (limited to 'setup.c')
| -rw-r--r-- | setup.c | 1101 |
1 files changed, 1033 insertions, 68 deletions
@@ -1,17 +1,33 @@ -#include "cache.h" +#include "git-compat-util.h" +#include "abspath.h" +#include "copy.h" +#include "environment.h" +#include "exec-cmd.h" +#include "gettext.h" +#include "object-name.h" +#include "refs.h" #include "repository.h" #include "config.h" #include "dir.h" +#include "setup.h" #include "string-list.h" #include "chdir-notify.h" -#include "promisor-remote.h" +#include "path.h" +#include "quote.h" +#include "trace2.h" +#include "worktree.h" static int inside_git_dir = -1; static int inside_work_tree = -1; static int work_tree_config_is_bogus; +enum allowed_bare_repo { + ALLOWED_BARE_REPO_EXPLICIT = 0, + ALLOWED_BARE_REPO_ALL, +}; static struct startup_info the_startup_info; struct startup_info *startup_info = &the_startup_info; +const char *tmp_original_cwd; /* * The input parameter must contain an absolute path, and it must already be @@ -432,7 +448,81 @@ void setup_work_tree(void) initialized = 1; } -static int read_worktree_config(const char *var, const char *value, void *vdata) +static void setup_original_cwd(void) +{ + struct strbuf tmp = STRBUF_INIT; + const char *worktree = NULL; + int offset = -1; + + if (!tmp_original_cwd) + return; + + /* + * startup_info->original_cwd points to the current working + * directory we inherited from our parent process, which is a + * directory we want to avoid removing. + * + * For convience, we would like to have the path relative to the + * worktree instead of an absolute path. + * + * Yes, startup_info->original_cwd is usually the same as 'prefix', + * but differs in two ways: + * - prefix has a trailing '/' + * - if the user passes '-C' to git, that modifies the prefix but + * not startup_info->original_cwd. + */ + + /* Normalize the directory */ + if (!strbuf_realpath(&tmp, tmp_original_cwd, 0)) { + trace2_data_string("setup", the_repository, + "realpath-path", tmp_original_cwd); + trace2_data_string("setup", the_repository, + "realpath-failure", strerror(errno)); + free((char*)tmp_original_cwd); + tmp_original_cwd = NULL; + return; + } + + free((char*)tmp_original_cwd); + tmp_original_cwd = NULL; + startup_info->original_cwd = strbuf_detach(&tmp, NULL); + + /* + * Get our worktree; we only protect the current working directory + * if it's in the worktree. + */ + worktree = get_git_work_tree(); + if (!worktree) + goto no_prevention_needed; + + offset = dir_inside_of(startup_info->original_cwd, worktree); + if (offset >= 0) { + /* + * If startup_info->original_cwd == worktree, that is already + * protected and we don't need original_cwd as a secondary + * protection measure. + */ + if (!*(startup_info->original_cwd + offset)) + goto no_prevention_needed; + + /* + * original_cwd was inside worktree; precompose it just as + * we do prefix so that built up paths will match + */ + startup_info->original_cwd = \ + precompose_string_if_needed(startup_info->original_cwd + + offset); + return; + } + +no_prevention_needed: + free((char*)startup_info->original_cwd); + startup_info->original_cwd = NULL; +} + +static int read_worktree_config(const char *var, const char *value, + const struct config_context *ctx UNUSED, + void *vdata) { struct repository_format *data = vdata; @@ -447,34 +537,125 @@ static int read_worktree_config(const char *var, const char *value, void *vdata) return 0; } -static int check_repo_format(const char *var, const char *value, void *vdata) -{ - struct repository_format *data = vdata; - const char *ext; +enum extension_result { + EXTENSION_ERROR = -1, /* compatible with error(), etc */ + EXTENSION_UNKNOWN = 0, + EXTENSION_OK = 1 +}; - if (strcmp(var, "core.repositoryformatversion") == 0) - data->version = git_config_int(var, value); - else if (skip_prefix(var, "extensions.", &ext)) { - /* - * record any known extensions here; otherwise, - * we fall through to recording it as unknown, and - * check_repository_format will complain - */ - if (!strcmp(ext, "noop")) - ; - else if (!strcmp(ext, "preciousobjects")) +/* + * Do not add new extensions to this function. It handles extensions which are + * respected even in v0-format repositories for historical compatibility. + */ +static enum extension_result handle_extension_v0(const char *var, + const char *value, + const char *ext, + struct repository_format *data) +{ + if (!strcmp(ext, "noop")) { + return EXTENSION_OK; + } else if (!strcmp(ext, "preciousobjects")) { data->precious_objects = git_config_bool(var, value); - else if (!strcmp(ext, "partialclone")) { + return EXTENSION_OK; + } else if (!strcmp(ext, "partialclone")) { if (!value) return config_error_nonbool(var); data->partial_clone = xstrdup(value); - } else if (!strcmp(ext, "worktreeconfig")) + return EXTENSION_OK; + } else if (!strcmp(ext, "worktreeconfig")) { data->worktree_config = git_config_bool(var, value); - else + return EXTENSION_OK; + } + + return EXTENSION_UNKNOWN; +} + +/* + * Record any new extensions in this function. + */ +static enum extension_result handle_extension(const char *var, + const char *value, + const char *ext, + struct repository_format *data) +{ + if (!strcmp(ext, "noop-v1")) { + return EXTENSION_OK; + } else if (!strcmp(ext, "objectformat")) { + int format; + + if (!value) + return config_error_nonbool(var); + format = hash_algo_by_name(value); + if (format == GIT_HASH_UNKNOWN) + return error(_("invalid value for '%s': '%s'"), + "extensions.objectformat", value); + data->hash_algo = format; + return EXTENSION_OK; + } else if (!strcmp(ext, "compatobjectformat")) { + struct string_list_item *item; + int format; + + if (!value) + return config_error_nonbool(var); + format = hash_algo_by_name(value); + if (format == GIT_HASH_UNKNOWN) + return error(_("invalid value for '%s': '%s'"), + "extensions.compatobjectformat", value); + /* For now only support compatObjectFormat being specified once. */ + for_each_string_list_item(item, &data->v1_only_extensions) { + if (!strcmp(item->string, "compatobjectformat")) + return error(_("'%s' already specified as '%s'"), + "extensions.compatobjectformat", + hash_algos[data->compat_hash_algo].name); + } + data->compat_hash_algo = format; + return EXTENSION_OK; + } else if (!strcmp(ext, "refstorage")) { + unsigned int format; + + if (!value) + return config_error_nonbool(var); + format = ref_storage_format_by_name(value); + if (format == REF_STORAGE_FORMAT_UNKNOWN) + return error(_("invalid value for '%s': '%s'"), + "extensions.refstorage", value); + data->ref_storage_format = format; + return EXTENSION_OK; + } + return EXTENSION_UNKNOWN; +} + +static int check_repo_format(const char *var, const char *value, + const struct config_context *ctx, void *vdata) +{ + struct repository_format *data = vdata; + const char *ext; + + if (strcmp(var, "core.repositoryformatversion") == 0) + data->version = git_config_int(var, value, ctx->kvi); + else if (skip_prefix(var, "extensions.", &ext)) { + switch (handle_extension_v0(var, value, ext, data)) { + case EXTENSION_ERROR: + return -1; + case EXTENSION_OK: + return 0; + case EXTENSION_UNKNOWN: + break; + } + + switch (handle_extension(var, value, ext, data)) { + case EXTENSION_ERROR: + return -1; + case EXTENSION_OK: + string_list_append(&data->v1_only_extensions, ext); + return 0; + case EXTENSION_UNKNOWN: string_list_append(&data->unknown_extensions, ext); + return 0; + } } - return read_worktree_config(var, value, vdata); + return read_worktree_config(var, value, ctx, vdata); } static int check_repository_format_gently(const char *gitdir, struct repository_format *candidate, int *nongit_ok) @@ -507,11 +688,10 @@ static int check_repository_format_gently(const char *gitdir, struct repository_ } repository_format_precious_objects = candidate->precious_objects; - set_repository_format_partial_clone(candidate->partial_clone); - repository_format_worktree_config = candidate->worktree_config; string_list_clear(&candidate->unknown_extensions, 0); + string_list_clear(&candidate->v1_only_extensions, 0); - if (repository_format_worktree_config) { + if (candidate->worktree_config) { /* * pick up core.bare and core.worktree from per-worktree * config if present @@ -538,6 +718,47 @@ static int check_repository_format_gently(const char *gitdir, struct repository_ return 0; } +int upgrade_repository_format(int target_version) +{ + struct strbuf sb = STRBUF_INIT; + struct strbuf err = STRBUF_INIT; + struct strbuf repo_version = STRBUF_INIT; + struct repository_format repo_fmt = REPOSITORY_FORMAT_INIT; + int ret; + + strbuf_git_common_path(&sb, the_repository, "config"); + read_repository_format(&repo_fmt, sb.buf); + strbuf_release(&sb); + + if (repo_fmt.version >= target_version) { + ret = 0; + goto out; + } + + if (verify_repository_format(&repo_fmt, &err) < 0) { + ret = error("cannot upgrade repository format from %d to %d: %s", + repo_fmt.version, target_version, err.buf); + goto out; + } + if (!repo_fmt.version && repo_fmt.unknown_extensions.nr) { + ret = error("cannot upgrade repository format: " + "unknown extension %s", + repo_fmt.unknown_extensions.items[0].string); + goto out; + } + + strbuf_addf(&repo_version, "%d", target_version); + git_config_set("core.repositoryformatversion", repo_version.buf); + + ret = 1; + +out: + clear_repository_format(&repo_fmt); + strbuf_release(&repo_version); + strbuf_release(&err); + return ret; +} + static void init_repository_format(struct repository_format *format) { const struct repository_format fresh = REPOSITORY_FORMAT_INIT; @@ -557,6 +778,7 @@ int read_repository_format(struct repository_format *format, const char *path) void clear_repository_format(struct repository_format *format) { string_list_clear(&format->unknown_extensions, 0); + string_list_clear(&format->v1_only_extensions, 0); free(format->work_tree); free(format->partial_clone); init_repository_format(format); @@ -574,7 +796,9 @@ int verify_repository_format(const struct repository_format *format, if (format->version >= 1 && format->unknown_extensions.nr) { int i; - strbuf_addstr(err, _("unknown repository extensions found:")); + strbuf_addstr(err, Q_("unknown repository extension found:", + "unknown repository extensions found:", + format->unknown_extensions.nr)); for (i = 0; i < format->unknown_extensions.nr; i++) strbuf_addf(err, "\n\t%s", @@ -582,6 +806,20 @@ int verify_repository_format(const struct repository_format *format, return -1; } + if (format->version == 0 && format->v1_only_extensions.nr) { + int i; + + strbuf_addstr(err, + Q_("repo version is 0, but v1-only extension found:", + "repo version is 0, but v1-only extensions found:", + format->v1_only_extensions.nr)); + + for (i = 0; i < format->v1_only_extensions.nr; i++) + strbuf_addf(err, "\n\t%s", + format->v1_only_extensions.items[i].string); + return -1; + } + return 0; } @@ -920,17 +1158,136 @@ static int canonicalize_ceiling_entry(struct string_list_item *item, } } -enum discovery_result { - GIT_DIR_NONE = 0, - GIT_DIR_EXPLICIT, - GIT_DIR_DISCOVERED, - GIT_DIR_BARE, - /* these are errors */ - GIT_DIR_HIT_CEILING = -1, - GIT_DIR_HIT_MOUNT_POINT = -2, - GIT_DIR_INVALID_GITFILE = -3 +struct safe_directory_data { + const char *path; + int is_safe; }; +static int safe_directory_cb(const char *key, const char *value, + const struct config_context *ctx UNUSED, void *d) +{ + struct safe_directory_data *data = d; + + if (strcmp(key, "safe.directory")) + return 0; + + if (!value || !*value) { + data->is_safe = 0; + } else if (!strcmp(value, "*")) { + data->is_safe = 1; + } else { + const char *interpolated = NULL; + + if (!git_config_pathname(&interpolated, key, value) && + !fspathcmp(data->path, interpolated ? interpolated : value)) + data->is_safe = 1; + + free((char *)interpolated); + } + + return 0; +} + +/* + * Check if a repository is safe, by verifying the ownership of the + * worktree (if any), the git directory, and the gitfile (if any). + * + * Exemptions for known-safe repositories can be added via `safe.directory` + * config settings; for non-bare repositories, their worktree needs to be + * added, for bare ones their git directory. + */ +static int ensure_valid_ownership(const char *gitfile, + const char *worktree, const char *gitdir, + struct strbuf *report) +{ + struct safe_directory_data data = { + .path = worktree ? worktree : gitdir + }; + + if (!git_env_bool("GIT_TEST_ASSUME_DIFFERENT_OWNER", 0) && + (!gitfile || is_path_owned_by_current_user(gitfile, report)) && + (!worktree || is_path_owned_by_current_user(worktree, report)) && + (!gitdir || is_path_owned_by_current_user(gitdir, report))) + return 1; + + /* + * data.path is the "path" that identifies the repository and it is + * constant regardless of what failed above. data.is_safe should be + * initialized to false, and might be changed by the callback. + */ + git_protected_config(safe_directory_cb, &data); + + return data.is_safe; +} + +static int allowed_bare_repo_cb(const char *key, const char *value, + const struct config_context *ctx UNUSED, + void *d) +{ + enum allowed_bare_repo *allowed_bare_repo = d; + + if (strcasecmp(key, "safe.bareRepository")) + return 0; + + if (!strcmp(value, "explicit")) { + *allowed_bare_repo = ALLOWED_BARE_REPO_EXPLICIT; + return 0; + } + if (!strcmp(value, "all")) { + *allowed_bare_repo = ALLOWED_BARE_REPO_ALL; + return 0; + } + return -1; +} + +static enum allowed_bare_repo get_allowed_bare_repo(void) +{ + enum allowed_bare_repo result = ALLOWED_BARE_REPO_ALL; + git_protected_config(allowed_bare_repo_cb, &result); + return result; +} + +static const char *allowed_bare_repo_to_string( + enum allowed_bare_repo allowed_bare_repo) +{ + switch (allowed_bare_repo) { + case ALLOWED_BARE_REPO_EXPLICIT: + return "explicit"; + case ALLOWED_BARE_REPO_ALL: + return "all"; + default: + BUG("invalid allowed_bare_repo %d", + allowed_bare_repo); + } + return NULL; +} + +static int is_implicit_bare_repo(const char *path) +{ + /* + * what we found is a ".git" directory at the root of + * the working tree. + */ + if (ends_with_path_components(path, ".git")) + return 1; + + /* + * we are inside $GIT_DIR of a secondary worktree of a + * non-bare repository. + */ + if (strstr(path, "/.git/worktrees/")) + return 1; + + /* + * we are inside $GIT_DIR of a worktree of a non-embedded + * submodule, whose superproject is not a bare repository. + */ + if (strstr(path, "/.git/modules/")) + return 1; + + return 0; +} + /* * We cannot decide in this function whether we are in the work tree or * not, since the config can only be read _after_ this function was called. @@ -946,6 +1303,7 @@ enum discovery_result { */ static enum discovery_result setup_git_directory_gently_1(struct strbuf *dir, struct strbuf *gitdir, + struct strbuf *report, int die_on_error) { const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT); @@ -1001,6 +1359,8 @@ static enum discovery_result setup_git_directory_gently_1(struct strbuf *dir, current_device = get_device_or_die(dir->buf, NULL, 0); for (;;) { int offset = dir->len, error_code = 0; + char *gitdir_path = NULL; + char *gitfile = NULL; if (offset > min_offset) strbuf_addch(dir, '/'); @@ -1011,18 +1371,56 @@ static enum discovery_result setup_git_directory_gently_1(struct strbuf *dir, if (die_on_error || error_code == READ_GITFILE_ERR_NOT_A_FILE) { /* NEEDSWORK: fail if .git is not file nor dir */ - if (is_git_directory(dir->buf)) + if (is_git_directory(dir->buf)) { gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT; + gitdir_path = xstrdup(dir->buf); + } } else if (error_code != READ_GITFILE_ERR_STAT_FAILED) return GIT_DIR_INVALID_GITFILE; - } + } else + gitfile = xstrdup(dir->buf); + /* + * Earlier, we tentatively added DEFAULT_GIT_DIR_ENVIRONMENT + * to check that directory for a repository. + * Now trim that tentative addition away, because we want to + * focus on the real directory we are in. + */ strbuf_setlen(dir, offset); if (gitdirenv) { - strbuf_addstr(gitdir, gitdirenv); - return GIT_DIR_DISCOVERED; + enum discovery_result ret; + const char *gitdir_candidate = + gitdir_path ? gitdir_path : gitdirenv; + + if (ensure_valid_ownership(gitfile, dir->buf, + gitdir_candidate, report)) { + strbuf_addstr(gitdir, gitdirenv); + ret = GIT_DIR_DISCOVERED; + } else + ret = GIT_DIR_INVALID_OWNERSHIP; + + /* + * Earlier, during discovery, we might have allocated + * string copies for gitdir_path or gitfile so make + * sure we don't leak by freeing them now, before + * leaving the loop and function. + * + * Note: gitdirenv will be non-NULL whenever these are + * allocated, therefore we need not take care of releasing + * them outside of this conditional block. + */ + free(gitdir_path); + free(gitfile); + + return ret; } if (is_git_directory(dir->buf)) { + trace2_data_string("setup", NULL, "implicit-bare-repository", dir->buf); + if (get_allowed_bare_repo() == ALLOWED_BARE_REPO_EXPLICIT && + !is_implicit_bare_repo(dir->buf)) + return GIT_DIR_DISALLOWED_BARE; + if (!ensure_valid_ownership(NULL, NULL, dir->buf, report)) + return GIT_DIR_INVALID_OWNERSHIP; strbuf_addstr(gitdir, "."); return GIT_DIR_BARE; } @@ -1042,21 +1440,23 @@ static enum discovery_result setup_git_directory_gently_1(struct strbuf *dir, } } -int discover_git_directory(struct strbuf *commondir, - struct strbuf *gitdir) +enum discovery_result discover_git_directory_reason(struct strbuf *commondir, + struct strbuf *gitdir) { struct strbuf dir = STRBUF_INIT, err = STRBUF_INIT; size_t gitdir_offset = gitdir->len, cwd_len; size_t commondir_offset = commondir->len; struct repository_format candidate = REPOSITORY_FORMAT_INIT; + enum discovery_result result; if (strbuf_getcwd(&dir)) - return -1; + return GIT_DIR_CWD_FAILURE; cwd_len = dir.len; - if (setup_git_directory_gently_1(&dir, gitdir, 0) <= 0) { + result = setup_git_directory_gently_1(&dir, gitdir, NULL, 0); + if (result <= 0) { strbuf_release(&dir); - return -1; + return result; } /* @@ -1086,17 +1486,17 @@ int discover_git_directory(struct strbuf *commondir, strbuf_setlen(commondir, commondir_offset); strbuf_setlen(gitdir, gitdir_offset); clear_repository_format(&candidate); - return -1; + return GIT_DIR_INVALID_FORMAT; } clear_repository_format(&candidate); - return 0; + return result; } const char *setup_git_directory_gently(int *nongit_ok) { static struct strbuf cwd = STRBUF_INIT; - struct strbuf dir = STRBUF_INIT, gitdir = STRBUF_INIT; + struct strbuf dir = STRBUF_INIT, gitdir = STRBUF_INIT, report = STRBUF_INIT; const char *prefix = NULL; struct repository_format repo_fmt = REPOSITORY_FORMAT_INIT; @@ -1121,7 +1521,7 @@ const char *setup_git_directory_gently(int *nongit_ok) die_errno(_("Unable to read current working directory")); strbuf_addbuf(&dir, &cwd); - switch (setup_git_directory_gently_1(&dir, &gitdir, 1)) { + switch (setup_git_directory_gently_1(&dir, &gitdir, &report, 1)) { case GIT_DIR_EXPLICIT: prefix = setup_explicit_git_dir(gitdir.buf, &cwd, &repo_fmt, nongit_ok); break; @@ -1149,15 +1549,39 @@ const char *setup_git_directory_gently(int *nongit_ok) dir.buf); *nongit_ok = 1; break; - case GIT_DIR_NONE: + case GIT_DIR_INVALID_OWNERSHIP: + if (!nongit_ok) { + struct strbuf quoted = STRBUF_INIT; + + strbuf_complete(&report, '\n'); + sq_quote_buf_pretty("ed, dir.buf); + die(_("detected dubious ownership in repository at '%s'\n" + "%s" + "To add an exception for this directory, call:\n" + "\n" + "\tgit config --global --add safe.directory %s"), + dir.buf, report.buf, quoted.buf); + } + *nongit_ok = 1; + break; + case GIT_DIR_DISALLOWED_BARE: + if (!nongit_ok) { + die(_("cannot use bare repository '%s' (safe.bareRepository is '%s')"), + dir.buf, + allowed_bare_repo_to_string(get_allowed_bare_repo())); + } + *nongit_ok = 1; + break; + case GIT_DIR_CWD_FAILURE: + case GIT_DIR_INVALID_FORMAT: /* * As a safeguard against setup_git_directory_gently_1 returning - * this value, fallthrough to BUG. Otherwise it is possible to + * these values, fallthrough to BUG. Otherwise it is possible to * set startup_info->have_repository to 1 when we did nothing to * find a repository. */ default: - BUG("unhandled setup_git_directory_1() result"); + BUG("unhandled setup_git_directory_gently_1() result"); } /* @@ -1170,18 +1594,10 @@ const char *setup_git_directory_gently(int *nongit_ok) * the GIT_PREFIX environment variable must always match. For details * see Documentation/config/alias.txt. */ - if (nongit_ok && *nongit_ok) { + if (nongit_ok && *nongit_ok) startup_info->have_repository = 0; - startup_info->prefix = NULL; - setenv(GIT_PREFIX_ENVIRONMENT, "", 1); - } else { + else startup_info->have_repository = 1; - startup_info->prefix = prefix; - if (prefix) - setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1); - else - setenv(GIT_PREFIX_ENVIRONMENT, "", 1); - } /* * Not all paths through the setup code will call 'set_git_dir()' (which @@ -1204,12 +1620,41 @@ const char *setup_git_directory_gently(int *nongit_ok) gitdir = DEFAULT_GIT_DIR_ENVIRONMENT; setup_git_env(gitdir); } - if (startup_info->have_repository) + if (startup_info->have_repository) { repo_set_hash_algo(the_repository, repo_fmt.hash_algo); + repo_set_compat_hash_algo(the_repository, + repo_fmt.compat_hash_algo); + repo_set_ref_storage_format(the_repository, + repo_fmt.ref_storage_format); + the_repository->repository_format_worktree_config = + repo_fmt.worktree_config; + /* take ownership of repo_fmt.partial_clone */ + the_repository->repository_format_partial_clone = + repo_fmt.partial_clone; + repo_fmt.partial_clone = NULL; + } + } + /* + * Since precompose_string_if_needed() needs to look at + * the core.precomposeunicode configuration, this + * has to happen after the above block that finds + * out where the repository is, i.e. a preparation + * for calling git_config_get_bool(). + */ + if (prefix) { + prefix = precompose_string_if_needed(prefix); + startup_info->prefix = prefix; + setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1); + } else { + startup_info->prefix = NULL; + setenv(GIT_PREFIX_ENVIRONMENT, "", 1); } + setup_original_cwd(); + strbuf_release(&dir); strbuf_release(&gitdir); + strbuf_release(&report); clear_repository_format(&repo_fmt); return prefix; @@ -1220,7 +1665,7 @@ int git_config_perm(const char *var, const char *value) int i; char *endptr; - if (value == NULL) + if (!value) return PERM_GROUP; if (!strcmp(value, "umask")) @@ -1273,6 +1718,14 @@ void check_repository_format(struct repository_format *fmt) fmt = &repo_fmt; check_repository_format_gently(get_git_dir(), fmt, NULL); startup_info->have_repository = 1; + repo_set_hash_algo(the_repository, fmt->hash_algo); + repo_set_compat_hash_algo(the_repository, fmt->compat_hash_algo); + repo_set_ref_storage_format(the_repository, + fmt->ref_storage_format); + the_repository->repository_format_worktree_config = + fmt->worktree_config; + the_repository->repository_format_partial_clone = + xstrdup_or_null(fmt->partial_clone); clear_repository_format(&repo_fmt); } @@ -1297,11 +1750,9 @@ const char *resolve_gitdir_gently(const char *suspect, int *return_error_code) /* if any standard file descriptor is missing open it to /dev/null */ void sanitize_stdfds(void) { - int fd = open("/dev/null", O_RDWR, 0); - while (fd != -1 && fd < 2) - fd = dup(fd); - if (fd == -1) - die_errno(_("open /dev/null or dup failed")); + int fd = xopen("/dev/null", O_RDWR); + while (fd < 2) + fd = xdup(fd); if (fd > 2) close(fd); } @@ -1329,3 +1780,517 @@ int daemonize(void) return 0; #endif } + +#ifdef NO_TRUSTABLE_FILEMODE +#define TEST_FILEMODE 0 +#else +#define TEST_FILEMODE 1 +#endif + +#define GIT_DEFAULT_HASH_ENVIRONMENT "GIT_DEFAULT_HASH" + +static void copy_templates_1(struct strbuf *path, struct strbuf *template_path, + DIR *dir) +{ + size_t path_baselen = path->len; + size_t template_baselen = template_path->len; + struct dirent *de; + + /* Note: if ".git/hooks" file exists in the repository being + * re-initialized, /etc/core-git/templates/hooks/update would + * cause "git init" to fail here. I think this is sane but + * it means that the set of templates we ship by default, along + * with the way the namespace under .git/ is organized, should + * be really carefully chosen. + */ + safe_create_dir(path->buf, 1); + while ((de = readdir(dir)) != NULL) { + struct stat st_git, st_template; + int exists = 0; + + strbuf_setlen(path, path_baselen); + strbuf_setlen(template_path, template_baselen); + + if (de->d_name[0] == '.') + continue; + strbuf_addstr(path, de->d_name); + strbuf_addstr(template_path, de->d_name); + if (lstat(path->buf, &st_git)) { + if (errno != ENOENT) + die_errno(_("cannot stat '%s'"), path->buf); + } + else + exists = 1; + + if (lstat(template_path->buf, &st_template)) + die_errno(_("cannot stat template '%s'"), template_path->buf); + + if (S_ISDIR(st_template.st_mode)) { + DIR *subdir = opendir(template_path->buf); + if (!subdir) + die_errno(_("cannot opendir '%s'"), template_path->buf); + strbuf_addch(path, '/'); + strbuf_addch(template_path, '/'); + copy_templates_1(path, template_path, subdir); + closedir(subdir); + } + else if (exists) + continue; + else if (S_ISLNK(st_template.st_mode)) { + struct strbuf lnk = STRBUF_INIT; + if (strbuf_readlink(&lnk, template_path->buf, + st_template.st_size) < 0) + die_errno(_("cannot readlink '%s'"), template_path->buf); + if (symlink(lnk.buf, path->buf)) + die_errno(_("cannot symlink '%s' '%s'"), + lnk.buf, path->buf); + strbuf_release(&lnk); + } + else if (S_ISREG(st_template.st_mode)) { + if (copy_file(path->buf, template_path->buf, st_template.st_mode)) + die_errno(_("cannot copy '%s' to '%s'"), + template_path->buf, path->buf); + } + else + error(_("ignoring template %s"), template_path->buf); + } +} + +static void copy_templates(const char *template_dir, const char *init_template_dir) +{ + struct strbuf path = STRBUF_INIT; + struct strbuf template_path = STRBUF_INIT; + size_t template_len; + struct repository_format template_format = REPOSITORY_FORMAT_INIT; + struct strbuf err = STRBUF_INIT; + DIR *dir; + char *to_free = NULL; + + if (!template_dir) + template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT); + if (!template_dir) + template_dir = init_template_dir; + if (!template_dir) + template_dir = to_free = system_path(DEFAULT_GIT_TEMPLATE_DIR); + if (!template_dir[0]) { + free(to_free); + return; + } + + strbuf_addstr(&template_path, template_dir); + strbuf_complete(&template_path, '/'); + template_len = template_path.len; + + dir = opendir(template_path.buf); + if (!dir) { + warning(_("templates not found in %s"), template_dir); + goto free_return; + } + + /* Make sure that template is from the correct vintage */ + strbuf_addstr(&template_path, "config"); + read_repository_format(&template_format, template_path.buf); + strbuf_setlen(&template_path, template_len); + + /* + * No mention of version at all is OK, but anything else should be + * verified. + */ + if (template_format.version >= 0 && + verify_repository_format(&template_format, &err) < 0) { + warning(_("not copying templates from '%s': %s"), + template_dir, err.buf); + strbuf_release(&err); + goto close_free_return; + } + + strbuf_addstr(&path, get_git_common_dir()); + strbuf_complete(&path, '/'); + copy_templates_1(&path, &template_path, dir); +close_free_return: + closedir(dir); +free_return: + free(to_free); + strbuf_release(&path); + strbuf_release(&template_path); + clear_repository_format(&template_format); +} + +/* + * If the git_dir is not directly inside the working tree, then git will not + * find it by default, and we need to set the worktree explicitly. + */ +static int needs_work_tree_config(const char *git_dir, const char *work_tree) +{ + if (!strcmp(work_tree, "/") && !strcmp(git_dir, "/.git")) + return 0; + if (skip_prefix(git_dir, work_tree, &git_dir) && + !strcmp(git_dir, "/.git")) + return 0; + return 1; +} + +void initialize_repository_version(int hash_algo, + unsigned int ref_storage_format, + int reinit) +{ + char repo_version_string[10]; + int repo_version = GIT_REPO_VERSION; + + /* + * Note that we initialize the repository version to 1 when the ref + * storage format is unknown. This is on purpose so that we can add the + * correct object format to the config during git-clone(1). The format + * version will get adjusted by git-clone(1) once it has learned about + * the remote repository's format. + */ + if (hash_algo != GIT_HASH_SHA1 || + ref_storage_format != REF_STORAGE_FORMAT_FILES) + repo_version = GIT_REPO_VERSION_READ; + + /* This forces creation of new config file */ + xsnprintf(repo_version_string, sizeof(repo_version_string), + "%d", repo_version); + git_config_set("core.repositoryformatversion", repo_version_string); + + if (hash_algo != GIT_HASH_SHA1 && hash_algo != GIT_HASH_UNKNOWN) + git_config_set("extensions.objectformat", + hash_algos[hash_algo].name); + else if (reinit) + git_config_set_gently("extensions.objectformat", NULL); + + if (ref_storage_format != REF_STORAGE_FORMAT_FILES) + git_config_set("extensions.refstorage", + ref_storage_format_to_name(ref_storage_format)); +} + +static int is_reinit(void) +{ + struct strbuf buf = STRBUF_INIT; + char junk[2]; + int ret; + + git_path_buf(&buf, "HEAD"); + ret = !access(buf.buf, R_OK) || readlink(buf.buf, junk, sizeof(junk) - 1) != -1; + strbuf_release(&buf); + return ret; +} + +void create_reference_database(unsigned int ref_storage_format, + const char *initial_branch, int quiet) +{ + struct strbuf err = STRBUF_INIT; + int reinit = is_reinit(); + + repo_set_ref_storage_format(the_repository, ref_storage_format); + if (refs_init_db(get_main_ref_store(the_repository), 0, &err)) + die("failed to set up refs db: %s", err.buf); + + /* + * Point the HEAD symref to the initial branch with if HEAD does + * not yet exist. + */ + if (!reinit) { + char *ref; + + if (!initial_branch) + initial_branch = git_default_branch_name(quiet); + + ref = xstrfmt("refs/heads/%s", initial_branch); + if (check_refname_format(ref, 0) < 0) + die(_("invalid initial branch name: '%s'"), + initial_branch); + + if (create_symref("HEAD", ref, NULL) < 0) + exit(1); + free(ref); + } + + if (reinit && initial_branch) + warning(_("re-init: ignored --initial-branch=%s"), + initial_branch); + + strbuf_release(&err); +} + +static int create_default_files(const char *template_path, + const char *original_git_dir, + const struct repository_format *fmt, + int init_shared_repository) +{ + struct stat st1; + struct strbuf buf = STRBUF_INIT; + char *path; + int reinit; + int filemode; + const char *init_template_dir = NULL; + const char *work_tree = get_git_work_tree(); + + /* + * First copy the templates -- we might have the default + * config file there, in which case we would want to read + * from it after installing. + * + * Before reading that config, we also need to clear out any cached + * values (since we've just potentially changed what's available on + * disk). + */ + git_config_get_pathname("init.templatedir", &init_template_dir); + copy_templates(template_path, init_template_dir); + free((char *)init_template_dir); + git_config_clear(); + reset_shared_repository(); + git_config(git_default_config, NULL); + + reinit = is_reinit(); + + /* + * We must make sure command-line options continue to override any + * values we might have just re-read from the config. + */ + if (init_shared_repository != -1) + set_shared_repository(init_shared_repository); + + is_bare_repository_cfg = !work_tree; + + /* + * We would have created the above under user's umask -- under + * shared-repository settings, we would need to fix them up. + */ + if (get_shared_repository()) { + adjust_shared_perm(get_git_dir()); + } + + initialize_repository_version(fmt->hash_algo, fmt->ref_storage_format, 0); + + /* Check filemode trustability */ + path = git_path_buf(&buf, "config"); + filemode = TEST_FILEMODE; + if (TEST_FILEMODE && !lstat(path, &st1)) { + struct stat st2; + filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) && + !lstat(path, &st2) && + st1.st_mode != st2.st_mode && + !chmod(path, st1.st_mode)); + if (filemode && !reinit && (st1.st_mode & S_IXUSR)) + filemode = 0; + } + git_config_set("core.filemode", filemode ? "true" : "false"); + + if (is_bare_repository()) + git_config_set("core.bare", "true"); + else { + git_config_set("core.bare", "false"); + /* allow template config file to override the default */ + if (log_all_ref_updates == LOG_REFS_UNSET) + git_config_set("core.logallrefupdates", "true"); + if (needs_work_tree_config(original_git_dir, work_tree)) + git_config_set("core.worktree", work_tree); + } + + if (!reinit) { + /* Check if symlink is supported in the work tree */ + path = git_path_buf(&buf, "tXXXXXX"); + if (!close(xmkstemp(path)) && + !unlink(path) && + !symlink("testing", path) && + !lstat(path, &st1) && + S_ISLNK(st1.st_mode)) + unlink(path); /* good */ + else + git_config_set("core.symlinks", "false"); + + /* Check if the filesystem is case-insensitive */ + path = git_path_buf(&buf, "CoNfIg"); + if (!access(path, F_OK)) + git_config_set("core.ignorecase", "true"); + probe_utf8_pathname_composition(); + } + + strbuf_release(&buf); + return reinit; +} + +static void create_object_directory(void) +{ + struct strbuf path = STRBUF_INIT; + size_t baselen; + + strbuf_addstr(&path, get_object_directory()); + baselen = path.len; + + safe_create_dir(path.buf, 1); + + strbuf_setlen(&path, baselen); + strbuf_addstr(&path, "/pack"); + safe_create_dir(path.buf, 1); + + strbuf_setlen(&path, baselen); + strbuf_addstr(&path, "/info"); + safe_create_dir(path.buf, 1); + + strbuf_release(&path); +} + +static void separate_git_dir(const char *git_dir, const char *git_link) +{ + struct stat st; + + if (!stat(git_link, &st)) { + const char *src; + + if (S_ISREG(st.st_mode)) + src = read_gitfile(git_link); + else if (S_ISDIR(st.st_mode)) + src = git_link; + else + die(_("unable to handle file type %d"), (int)st.st_mode); + + if (rename(src, git_dir)) + die_errno(_("unable to move %s to %s"), src, git_dir); + repair_worktrees(NULL, NULL); + } + + write_file(git_link, "gitdir: %s", git_dir); +} + +static void validate_hash_algorithm(struct repository_format *repo_fmt, int hash) +{ + const char *env = getenv(GIT_DEFAULT_HASH_ENVIRONMENT); + /* + * If we already have an initialized repo, don't allow the user to + * specify a different algorithm, as that could cause corruption. + * Otherwise, if the user has specified one on the command line, use it. + */ + if (repo_fmt->version >= 0 && hash != GIT_HASH_UNKNOWN && hash != repo_fmt->hash_algo) + die(_("attempt to reinitialize repository with different hash")); + else if (hash != GIT_HASH_UNKNOWN) + repo_fmt->hash_algo = hash; + else if (env) { + int env_algo = hash_algo_by_name(env); + if (env_algo == GIT_HASH_UNKNOWN) + die(_("unknown hash algorithm '%s'"), env); + repo_fmt->hash_algo = env_algo; + } +} + +static void validate_ref_storage_format(struct repository_format *repo_fmt, + unsigned int format) +{ + const char *name = getenv("GIT_DEFAULT_REF_FORMAT"); + + if (repo_fmt->version >= 0 && + format != REF_STORAGE_FORMAT_UNKNOWN && + format != repo_fmt->ref_storage_format) { + die(_("attempt to reinitialize repository with different reference storage format")); + } else if (format != REF_STORAGE_FORMAT_UNKNOWN) { + repo_fmt->ref_storage_format = format; + } else if (name) { + format = ref_storage_format_by_name(name); + if (format == REF_STORAGE_FORMAT_UNKNOWN) + die(_("unknown ref storage format '%s'"), name); + repo_fmt->ref_storage_format = format; + } +} + +int init_db(const char *git_dir, const char *real_git_dir, + const char *template_dir, int hash, + unsigned int ref_storage_format, + const char *initial_branch, + int init_shared_repository, unsigned int flags) +{ + int reinit; + int exist_ok = flags & INIT_DB_EXIST_OK; + char *original_git_dir = real_pathdup(git_dir, 1); + struct repository_format repo_fmt = REPOSITORY_FORMAT_INIT; + + if (real_git_dir) { + struct stat st; + + if (!exist_ok && !stat(git_dir, &st)) + die(_("%s already exists"), git_dir); + + if (!exist_ok && !stat(real_git_dir, &st)) + die(_("%s already exists"), real_git_dir); + + set_git_dir(real_git_dir, 1); + git_dir = get_git_dir(); + separate_git_dir(git_dir, original_git_dir); + } + else { + set_git_dir(git_dir, 1); + git_dir = get_git_dir(); + } + startup_info->have_repository = 1; + + /* Ensure `core.hidedotfiles` is processed */ + git_config(platform_core_config, NULL); + + safe_create_dir(git_dir, 0); + + + /* Check to see if the repository version is right. + * Note that a newly created repository does not have + * config file, so this will not fail. What we are catching + * is an attempt to reinitialize new repository with an old tool. + */ + check_repository_format(&repo_fmt); + + validate_hash_algorithm(&repo_fmt, hash); + validate_ref_storage_format(&repo_fmt, ref_storage_format); + + reinit = create_default_files(template_dir, original_git_dir, + &repo_fmt, init_shared_repository); + + /* + * Now that we have set up both the hash algorithm and the ref storage + * format we can update the repository's settings accordingly. + */ + repo_set_hash_algo(the_repository, repo_fmt.hash_algo); + repo_set_ref_storage_format(the_repository, repo_fmt.ref_storage_format); + + if (!(flags & INIT_DB_SKIP_REFDB)) + create_reference_database(repo_fmt.ref_storage_format, + initial_branch, flags & INIT_DB_QUIET); + create_object_directory(); + + if (get_shared_repository()) { + char buf[10]; + /* We do not spell "group" and such, so that + * the configuration can be read by older version + * of git. Note, we use octal numbers for new share modes, + * and compatibility values for PERM_GROUP and + * PERM_EVERYBODY. + */ + if (get_shared_repository() < 0) + /* force to the mode value */ + xsnprintf(buf, sizeof(buf), "0%o", -get_shared_repository()); + else if (get_shared_repository() == PERM_GROUP) + xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP); + else if (get_shared_repository() == PERM_EVERYBODY) + xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY); + else + BUG("invalid value for shared_repository"); + git_config_set("core.sharedrepository", buf); + git_config_set("receive.denyNonFastforwards", "true"); + } + + if (!(flags & INIT_DB_QUIET)) { + int len = strlen(git_dir); + + if (reinit) + printf(get_shared_repository() + ? _("Reinitialized existing shared Git repository in %s%s\n") + : _("Reinitialized existing Git repository in %s%s\n"), + git_dir, len && git_dir[len-1] != '/' ? "/" : ""); + else + printf(get_shared_repository() + ? _("Initialized empty shared Git repository in %s%s\n") + : _("Initialized empty Git repository in %s%s\n"), + git_dir, len && git_dir[len-1] != '/' ? "/" : ""); + } + + clear_repository_format(&repo_fmt); + free(original_git_dir); + return 0; +} |