#include "cache.h"

#include "dir.h"

#include "string-list.h"

static int inside_git_dir = -1;

static int inside_work_tree = -1;

static int work_tree_config_is_bogus;

static struct startup_info the_startup_info;

struct startup_info *startup_info = &the_startup_info;

/*

* The input parameter must contain an absolute path, and it must already be

* normalized.

*

* Find the part of an absolute path that lies inside the work tree by

* dereferencing symlinks outside the work tree, for example:

* /dir1/repo/dir2/file (work tree is /dir1/repo) -> dir2/file

* /dir/file (work tree is /) -> dir/file

* /dir/symlink1/symlink2 (symlink1 points to work tree) -> symlink2

* /dir/repolink/file (repolink points to /dir/repo) -> file

* /dir/repo (exactly equal to work tree) -> (empty string)

*/

static int abspath_part_inside_repo(char *path)

{

size_t len;

size_t wtlen;

char *path0;

int off;

const char *work_tree = get_git_work_tree();

if (!work_tree)

return -1;

wtlen = strlen(work_tree);

len = strlen(path);

off = offset_1st_component(path);

/* check if work tree is already the prefix */

if (wtlen <= len && !strncmp(path, work_tree, wtlen)) {

if (path[wtlen] == '/') {

memmove(path, path + wtlen + 1, len - wtlen);

return 0;

} else if (path[wtlen - 1] == '/' || path[wtlen] == '\0') {

/* work tree is the root, or the whole path */

memmove(path, path + wtlen, len - wtlen + 1);

return 0;

}

/* work tree might match beginning of a symlink to work tree */

off = wtlen;

}

path0 = path;

path += off;

/* check each '/'-terminated level */

while (*path) {

path++;

if (*path == '/') {

*path = '\0';

if (strcmp(real_path(path0), work_tree) == 0) {

memmove(path0, path + 1, len - (path - path0));

return 0;

}

*path = '/';

}

}

/* check whole path */

if (strcmp(real_path(path0), work_tree) == 0) {

*path0 = '\0';

return 0;

}

return -1;

}

/*

* Normalize "path", prepending the "prefix" for relative paths. If

* remaining_prefix is not NULL, return the actual prefix still

* remains in the path. For example, prefix = sub1/sub2/ and path is

*

* foo -> sub1/sub2/foo (full prefix)

* ../foo -> sub1/foo (remaining prefix is sub1/)

* ../../bar -> bar (no remaining prefix)

* ../../sub1/sub2/foo -> sub1/sub2/foo (but no remaining prefix)

* `pwd`/../bar -> sub1/bar (no remaining prefix)

*/

char *prefix_path_gently(const char *prefix, int len,

int *remaining_prefix, const char *path)

{

const char *orig = path;

char *sanitized;

if (is_absolute_path(orig)) {

sanitized = xmallocz(strlen(path));

if (remaining_prefix)

*remaining_prefix = 0;

if (normalize_path_copy_len(sanitized, path, remaining_prefix)) {

free(sanitized);

return NULL;

}

if (abspath_part_inside_repo(sanitized)) {

free(sanitized);

return NULL;

}

} else {

sanitized = xstrfmt("%.*s%s", len, len ? prefix : "", path);

if (remaining_prefix)

*remaining_prefix = len;

if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix)) {

free(sanitized);

return NULL;

}

}

return sanitized;

}

char *prefix_path(const char *prefix, int len, const char *path)

{

char *r = prefix_path_gently(prefix, len, NULL, path);

if (!r)

die("'%s' is outside repository", path);

return r;

}

int path_inside_repo(const char *prefix, const char *path)

{

int len = prefix ? strlen(prefix) : 0;

char *r = prefix_path_gently(prefix, len, NULL, path);

if (r) {

free(r);

return 1;

}

return 0;

}

int check_filename(const char *prefix, const char *arg)

{

const char *name;

struct stat st;

if (starts_with(arg, ":/")) {

if (arg[2] == '\0') /* ":/" is root dir, always exists */

return 1;

name = arg + 2;

} else if (prefix)

name = prefix_filename(prefix, strlen(prefix), arg);

else

name = arg;

if (!lstat(name, &st))

return 1; /* file exists */

if (errno == ENOENT || errno == ENOTDIR)

return 0; /* file does not exist */

die_errno("failed to stat '%s'", arg);

}

static void NORETURN die_verify_filename(const char *prefix,

const char *arg,

int diagnose_misspelt_rev)

{

if (!diagnose_misspelt_rev)

die(_("%s: no such path in the working tree.\n"

"Use 'git -- ...' to specify paths that do not exist locally."),

arg);

/*

* Saying "'(icase)foo' does not exist in the index" when the

* user gave us ":(icase)foo" is just stupid. A magic pathspec

* begins with a colon and is followed by a non-alnum; do not

* let maybe_die_on_misspelt_object_name() even trigger.

*/

if (!(arg[0] == ':' && !isalnum(arg[1])))

maybe_die_on_misspelt_object_name(arg, prefix);

/* ... or fall back the most general message. */

die(_("ambiguous argument '%s': unknown revision or path not in the working tree.\n"

"Use '--' to separate paths from revisions, like this:\n"

"'git [...] -- [...]'"), arg);

}

/*

* Verify a filename that we got as an argument for a pathspec

* entry. Note that a filename that begins with "-" never verifies

* as true, because even if such a filename were to exist, we want

* it to be preceded by the "--" marker (or we want the user to

* use a format like "./-filename")

*

* The "diagnose_misspelt_rev" is used to provide a user-friendly

* diagnosis when dying upon finding that "name" is not a pathname.

* If set to 1, the diagnosis will try to diagnose "name" as an

* invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis

* will only complain about an inexisting file.

*

* This function is typically called to check that a "file or rev"

* argument is unambiguous. In this case, the caller will want

* diagnose_misspelt_rev == 1 when verifying the first non-rev

* argument (which could have been a revision), and

* diagnose_misspelt_rev == 0 for the next ones (because we already

* saw a filename, there's not ambiguity anymore).

*/

void verify_filename(const char *prefix,

const char *arg,

int diagnose_misspelt_rev)

{

if (*arg == '-')

die("bad flag '%s' used after filename", arg);

if (check_filename(prefix, arg) || !no_wildcard(arg))

return;

die_verify_filename(prefix, arg, diagnose_misspelt_rev);

}

/*

* Opposite of the above: the command line did not have -- marker

* and we parsed the arg as a refname. It should not be interpretable

* as a filename.

*/

void verify_non_filename(const char *prefix, const char *arg)

{

if (!is_inside_work_tree() || is_inside_git_dir())

return;

if (*arg == '-')

return; /* flag */

if (!check_filename(prefix, arg))

return;

die(_("ambiguous argument '%s': both revision and filename\n"

"Use '--' to separate paths from revisions, like this:\n"

"'git [...] -- [...]'"), arg);

}

int get_common_dir(struct strbuf *sb, const char *gitdir)

{

const char *git_env_common_dir = getenv(GIT_COMMON_DIR_ENVIRONMENT);

if (git_env_common_dir) {

strbuf_addstr(sb, git_env_common_dir);

return 1;

} else {

return get_common_dir_noenv(sb, gitdir);

}

}

int get_common_dir_noenv(struct strbuf *sb, const char *gitdir)

{

struct strbuf data = STRBUF_INIT;

struct strbuf path = STRBUF_INIT;

int ret = 0;

strbuf_addf(&path, "%s/commondir", gitdir);

if (file_exists(path.buf)) {

if (strbuf_read_file(&data, path.buf, 0) <= 0)

die_errno(_("failed to read %s"), path.buf);

while (data.len && (data.buf[data.len - 1] == '\n' ||

data.buf[data.len - 1] == '\r'))

data.len--;

data.buf[data.len] = '\0';

strbuf_reset(&path);

if (!is_absolute_path(data.buf))

strbuf_addf(&path, "%s/", gitdir);

strbuf_addbuf(&path, &data);

strbuf_addstr(sb, real_path(path.buf));

ret = 1;

} else

strbuf_addstr(sb, gitdir);

strbuf_release(&data);

strbuf_release(&path);

return ret;

}

/*

* Test if it looks like we're at a git directory.

* We want to see:

*

* - either an objects/ directory _or_ the proper

* GIT_OBJECT_DIRECTORY environment variable

* - a refs/ directory

* - either a HEAD symlink or a HEAD file that is formatted as

* a proper "ref:", or a regular file HEAD that has a properly

* formatted sha1 object name.

*/

int is_git_directory(const char *suspect)

{

struct strbuf path = STRBUF_INIT;

int ret = 0;

size_t len;

/* Check worktree-related signatures */

strbuf_addf(&path, "%s/HEAD", suspect);

if (validate_headref(path.buf))

goto done;

strbuf_reset(&path);

get_common_dir(&path, suspect);

len = path.len;

/* Check non-worktree-related signatures */

if (getenv(DB_ENVIRONMENT)) {

if (access(getenv(DB_ENVIRONMENT), X_OK))

goto done;

}

else {

strbuf_setlen(&path, len);

strbuf_addstr(&path, "/objects");

if (access(path.buf, X_OK))

goto done;

}

strbuf_setlen(&path, len);

strbuf_addstr(&path, "/refs");

if (access(path.buf, X_OK))

goto done;

ret = 1;

done:

strbuf_release(&path);

return ret;

}

int is_nonbare_repository_dir(struct strbuf *path)

{

int ret = 0;

int gitfile_error;

size_t orig_path_len = path->len;

assert(orig_path_len != 0);

strbuf_complete(path, '/');

strbuf_addstr(path, ".git");

if (read_gitfile_gently(path->buf, &gitfile_error) || is_git_directory(path->buf))

ret = 1;

if (gitfile_error == READ_GITFILE_ERR_OPEN_FAILED ||

gitfile_error == READ_GITFILE_ERR_READ_FAILED)

ret = 1;

strbuf_setlen(path, orig_path_len);

return ret;

}

int is_inside_git_dir(void)

{

if (inside_git_dir < 0)

inside_git_dir = is_inside_dir(get_git_dir());

return inside_git_dir;

}

int is_inside_work_tree(void)

{

if (inside_work_tree < 0)

inside_work_tree = is_inside_dir(get_git_work_tree());

return inside_work_tree;

}

void setup_work_tree(void)

{

const char *work_tree, *git_dir;

static int initialized = 0;

if (initialized)

return;

if (work_tree_config_is_bogus)

die("unable to set up work tree using invalid config");

work_tree = get_git_work_tree();

git_dir = get_git_dir();

if (!is_absolute_path(git_dir))

git_dir = real_path(get_git_dir());

if (!work_tree || chdir(work_tree))

die("This operation must be run in a work tree");

/*

* Make sure subsequent git processes find correct worktree

* if $GIT_WORK_TREE is set relative

*/

if (getenv(GIT_WORK_TREE_ENVIRONMENT))

setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);

set_git_dir(remove_leading_path(git_dir, work_tree));

initialized = 1;

}

static int check_repo_format(const char *var, const char *value, void *vdata)

{

struct repository_format *data = vdata;

const char *ext;

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"))

data->precious_objects = git_config_bool(var, value);

else

string_list_append(&data->unknown_extensions, ext);

} else if (strcmp(var, "core.bare") == 0) {

data->is_bare = git_config_bool(var, value);

} else if (strcmp(var, "core.worktree") == 0) {

if (!value)

return config_error_nonbool(var);

data->work_tree = xstrdup(value);

}

return 0;

}

static int check_repository_format_gently(const char *gitdir, int *nongit_ok)

{

struct strbuf sb = STRBUF_INIT;

struct strbuf err = STRBUF_INIT;

struct repository_format candidate;

int has_common;

has_common = get_common_dir(&sb, gitdir);

strbuf_addstr(&sb, "/config");

read_repository_format(&candidate, sb.buf);

strbuf_release(&sb);

/*

* For historical use of check_repository_format() in git-init,

* we treat a missing config as a silent "ok", even when nongit_ok

* is unset.

*/

if (candidate.version < 0)

return 0;

if (verify_repository_format(&candidate, &err) < 0) {

if (nongit_ok) {

warning("%s", err.buf);

strbuf_release(&err);

*nongit_ok = -1;

return -1;

}

die("%s", err.buf);

}

repository_format_precious_objects = candidate.precious_objects;

string_list_clear(&candidate.unknown_extensions, 0);

if (!has_common) {

if (candidate.is_bare != -1) {

is_bare_repository_cfg = candidate.is_bare;

if (is_bare_repository_cfg == 1)

inside_work_tree = -1;

}

if (candidate.work_tree) {

free(git_work_tree_cfg);

git_work_tree_cfg = candidate.work_tree;

inside_work_tree = -1;

}

} else {

free(candidate.work_tree);

}

return 0;

}

int read_repository_format(struct repository_format *format, const char *path)

{

memset(format, 0, sizeof(*format));

format->version = -1;

format->is_bare = -1;

string_list_init(&format->unknown_extensions, 1);

git_config_from_file(check_repo_format, path, format);

return format->version;

}

int verify_repository_format(const struct repository_format *format,

struct strbuf *err)

{

if (GIT_REPO_VERSION_READ < format->version) {

strbuf_addf(err, _("Expected git repo version <= %d, found %d"),

GIT_REPO_VERSION_READ, format->version);

return -1;

}

if (format->version >= 1 && format->unknown_extensions.nr) {

int i;

strbuf_addstr(err, _("unknown repository extensions found:"));

for (i = 0; i < format->unknown_extensions.nr; i++)

strbuf_addf(err, "\n\t%s",

format->unknown_extensions.items[i].string);

return -1;

}

return 0;

}

/*

* Try to read the location of the git directory from the .git file,

* return path to git directory if found.

*

* On failure, if return_error_code is not NULL, return_error_code

* will be set to an error code and NULL will be returned. If

* return_error_code is NULL the function will die instead (for most

* cases).

*/

const char *read_gitfile_gently(const char *path, int *return_error_code)

{

const int max_file_size = 1 << 20; /* 1MB */

int error_code = 0;

char *buf = NULL;

char *dir = NULL;

const char *slash;

struct stat st;

int fd;

ssize_t len;

if (stat(path, &st)) {

error_code = READ_GITFILE_ERR_STAT_FAILED;

goto cleanup_return;

}

if (!S_ISREG(st.st_mode)) {

error_code = READ_GITFILE_ERR_NOT_A_FILE;

goto cleanup_return;

}

if (st.st_size > max_file_size) {

error_code = READ_GITFILE_ERR_TOO_LARGE;

goto cleanup_return;

}

fd = open(path, O_RDONLY);

if (fd < 0) {

error_code = READ_GITFILE_ERR_OPEN_FAILED;

goto cleanup_return;

}

buf = xmallocz(st.st_size);

len = read_in_full(fd, buf, st.st_size);

close(fd);

if (len != st.st_size) {

error_code = READ_GITFILE_ERR_READ_FAILED;

goto cleanup_return;

}

if (!starts_with(buf, "gitdir: ")) {

error_code = READ_GITFILE_ERR_INVALID_FORMAT;

goto cleanup_return;

}

while (buf[len - 1] == '\n' || buf[len - 1] == '\r')

len--;

if (len < 9) {

error_code = READ_GITFILE_ERR_NO_PATH;

goto cleanup_return;

}

buf[len] = '\0';

dir = buf + 8;

if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {

size_t pathlen = slash+1 - path;

dir = xstrfmt("%.*s%.*s", (int)pathlen, path,

(int)(len - 8), buf + 8);

free(buf);

buf = dir;

}

if (!is_git_directory(dir)) {

error_code = READ_GITFILE_ERR_NOT_A_REPO;

goto cleanup_return;

}

path = real_path(dir);

cleanup_return:

if (return_error_code)

*return_error_code = error_code;

else if (error_code) {

switch (error_code) {

case READ_GITFILE_ERR_STAT_FAILED:

case READ_GITFILE_ERR_NOT_A_FILE:

/* non-fatal; follow return path */

break;

case READ_GITFILE_ERR_OPEN_FAILED:

die_errno("Error opening '%s'", path);

case READ_GITFILE_ERR_TOO_LARGE:

die("Too large to be a .git file: '%s'", path);

case READ_GITFILE_ERR_READ_FAILED:

die("Error reading %s", path);

case READ_GITFILE_ERR_INVALID_FORMAT:

die("Invalid gitfile format: %s", path);

case READ_GITFILE_ERR_NO_PATH:

die("No path in gitfile: %s", path);

case READ_GITFILE_ERR_NOT_A_REPO:

die("Not a git repository: %s", dir);

default:

assert(0);

}

}

free(buf);

return error_code ? NULL : path;

}

static const char *setup_explicit_git_dir(const char *gitdirenv,

struct strbuf *cwd,

int *nongit_ok)

{

const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);

const char *worktree;

char *gitfile;

int offset;

if (PATH_MAX - 40 < strlen(gitdirenv))

die("'$%s' too big", GIT_DIR_ENVIRONMENT);

gitfile = (char*)read_gitfile(gitdirenv);

if (gitfile) {

gitfile = xstrdup(gitfile);

gitdirenv = gitfile;

}

if (!is_git_directory(gitdirenv)) {

if (nongit_ok) {

*nongit_ok = 1;

free(gitfile);

return NULL;

}

die("Not a git repository: '%s'", gitdirenv);

}

if (check_repository_format_gently(gitdirenv, nongit_ok)) {

free(gitfile);

return NULL;

}

/* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */

if (work_tree_env)

set_git_work_tree(work_tree_env);

else if (is_bare_repository_cfg > 0) {

if (git_work_tree_cfg) {

/* #22.2, #30 */

warning("core.bare and core.worktree do not make sense");

work_tree_config_is_bogus = 1;

}

/* #18, #26 */

set_git_dir(gitdirenv);

free(gitfile);

return NULL;

}

else if (git_work_tree_cfg) { /* #6, #14 */

if (is_absolute_path(git_work_tree_cfg))

set_git_work_tree(git_work_tree_cfg);

else {

char *core_worktree;

if (chdir(gitdirenv))

die_errno("Could not chdir to '%s'", gitdirenv);

if (chdir(git_work_tree_cfg))

die_errno("Could not chdir to '%s'", git_work_tree_cfg);

core_worktree = xgetcwd();

if (chdir(cwd->buf))

die_errno("Could not come back to cwd");

set_git_work_tree(core_worktree);

free(core_worktree);

}

}

else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {

/* #16d */

set_git_dir(gitdirenv);

free(gitfile);

return NULL;

}

else /* #2, #10 */

set_git_work_tree(".");

/* set_git_work_tree() must have been called by now */

worktree = get_git_work_tree();

/* both get_git_work_tree() and cwd are already normalized */

if (!strcmp(cwd->buf, worktree)) { /* cwd == worktree */

set_git_dir(gitdirenv);

free(gitfile);

return NULL;

}

offset = dir_inside_of(cwd->buf, worktree);

if (offset >= 0) {/* cwd inside worktree? */

set_git_dir(real_path(gitdirenv));

if (chdir(worktree))

die_errno("Could not chdir to '%s'", worktree);

strbuf_addch(cwd, '/');

free(gitfile);

return cwd->buf + offset;

}

/* cwd outside worktree */

set_git_dir(gitdirenv);

free(gitfile);

return NULL;

}

static const char *setup_discovered_git_dir(const char *gitdir,

struct strbuf *cwd, int offset,

int *nongit_ok)

{

if (check_repository_format_gently(gitdir, nongit_ok))

return NULL;

/* --work-tree is set without --git-dir; use discovered one */

if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {

if (offset != cwd->len && !is_absolute_path(gitdir))

gitdir = xstrdup(real_path(gitdir));

if (chdir(cwd->buf))

die_errno("Could not come back to cwd");

return setup_explicit_git_dir(gitdir, cwd, nongit_ok);

}

/* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */

if (is_bare_repository_cfg > 0) {

set_git_dir(offset == cwd->len ? gitdir : real_path(gitdir));

if (chdir(cwd->buf))

die_errno("Could not come back to cwd");

return NULL;

}

/* #0, #1, #5, #8, #9, #12, #13 */

set_git_work_tree(".");

if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))

set_git_dir(gitdir);

inside_git_dir = 0;

inside_work_tree = 1;

if (offset == cwd->len)

return NULL;

/* Make "offset" point to past the '/', and add a '/' at the end */

offset++;

strbuf_addch(cwd, '/');

return cwd->buf + offset;

}

/* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */

static const char *setup_bare_git_dir(struct strbuf *cwd, int offset,

int *nongit_ok)

{

int root_len;

if (check_repository_format_gently(".", nongit_ok))

return NULL;

setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);

/* --work-tree is set without --git-dir; use discovered one */

if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {

const char *gitdir;

gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset);

if (chdir(cwd->buf))

die_errno("Could not come back to cwd");

return setup_explicit_git_dir(gitdir, cwd, nongit_ok);

}

inside_git_dir = 1;

inside_work_tree = 0;

if (offset != cwd->len) {

if (chdir(cwd->buf))

die_errno("Cannot come back to cwd");

root_len = offset_1st_component(cwd->buf);

strbuf_setlen(cwd, offset > root_len ? offset : root_len);

set_git_dir(cwd->buf);

}

else

set_git_dir(".");

return NULL;

}

static const char *setup_nongit(const char *cwd, int *nongit_ok)

{

if (!nongit_ok)

die(_("Not a git repository (or any of the parent directories): %s"), DEFAULT_GIT_DIR_ENVIRONMENT);

if (chdir(cwd))

die_errno(_("Cannot come back to cwd"));

*nongit_ok = 1;

return NULL;

}

static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)

{

struct stat buf;

if (stat(path, &buf)) {

die_errno("failed to stat '%*s%s%s'",

prefix_len,

prefix ? prefix : "",

prefix ? "/" : "", path);

}

return buf.st_dev;

}

/*

* A "string_list_each_func_t" function that canonicalizes an entry

* from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or

* discards it if unusable. The presence of an empty entry in

* GIT_CEILING_DIRECTORIES turns off canonicalization for all

* subsequent entries.

*/

static int canonicalize_ceiling_entry(struct string_list_item *item,

void *cb_data)

{

int *empty_entry_found = cb_data;

char *ceil = item->string;

if (!*ceil) {

*empty_entry_found = 1;

return 0;

} else if (!is_absolute_path(ceil)) {

return 0;

} else if (*empty_entry_found) {

/* Keep entry but do not canonicalize it */

return 1;

} else {

const char *real_path = real_path_if_valid(ceil);

if (!real_path)

return 0;

free(item->string);

item->string = xstrdup(real_path);

return 1;

}

}

/*

* 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.

*/

static const char *setup_git_directory_gently_1(int *nongit_ok)

{

const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);

struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;

static struct strbuf cwd = STRBUF_INIT;

const char *gitdirenv, *ret;

char *gitfile;

int offset, offset_parent, ceil_offset = -1;

dev_t current_device = 0;

int one_filesystem = 1;

/*

* We may have read an incomplete configuration before

* setting-up the git directory. If so, clear the cache so

* that the next queries to the configuration reload complete

* configuration (including the per-repo config file that we

* ignored previously).

*/

git_config_clear();

/*

* Let's assume that we are in a git repository.

* If it turns out later that we are somewhere else, the value will be

* updated accordingly.

*/

if (nongit_ok)

*nongit_ok = 0;

if (strbuf_getcwd(&cwd))

die_errno(_("Unable to read current working directory"));

offset = cwd.len;

/*

* If GIT_DIR is set explicitly, we're not going

* to do any discovery, but we still do repository

* validation.

*/

gitdirenv = getenv(GIT_DIR_ENVIRONMENT);

if (gitdirenv)

return setup_explicit_git_dir(gitdirenv, &cwd, nongit_ok);

if (env_ceiling_dirs) {

int empty_entry_found = 0;

string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);

filter_string_list(&ceiling_dirs, 0,

canonicalize_ceiling_entry, &empty_entry_found);

ceil_offset = longest_ancestor_length(cwd.buf, &ceiling_dirs);

string_list_clear(&ceiling_dirs, 0);

}

if (ceil_offset < 0 && has_dos_drive_prefix(cwd.buf))

ceil_offset = 1;

/*

* Test in the following order (relative to the cwd):

* - .git (file containing "gitdir: ")

* - .git/

* - ./ (bare)

* - ../.git

* - ../.git/

* - ../ (bare)

* - ../../.git/

* etc.

*/

one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);

if (one_filesystem)

current_device = get_device_or_die(".", NULL, 0);

for (;;) {

gitfile = (char*)read_gitfile(DEFAULT_GIT_DIR_ENVIRONMENT);

if (gitfile)

gitdirenv = gitfile = xstrdup(gitfile);

else {

if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))

gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;

}

if (gitdirenv) {

ret = setup_discovered_git_dir(gitdirenv,

&cwd, offset,

nongit_ok);

free(gitfile);

return ret;

}

free(gitfile);

if (is_git_directory("."))

return setup_bare_git_dir(&cwd, offset, nongit_ok);

offset_parent = offset;

while (--offset_parent > ceil_offset && cwd.buf[offset_parent] != '/');

if (offset_parent <= ceil_offset)

return setup_nongit(cwd.buf, nongit_ok);

if (one_filesystem) {

dev_t parent_device = get_device_or_die("..", cwd.buf,

offset);

if (parent_device != current_device) {

if (nongit_ok) {

if (chdir(cwd.buf))

die_errno(_("Cannot come back to cwd"));

*nongit_ok = 1;

return NULL;

}

strbuf_setlen(&cwd, offset);

die(_("Not a git repository (or any parent up to mount point %s)\n"

"Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set)."),

cwd.buf);

}

}

if (chdir("..")) {

strbuf_setlen(&cwd, offset);

die_errno(_("Cannot change to '%s/..'"), cwd.buf);

}

offset = offset_parent;

}

}

const char *setup_git_directory_gently(int *nongit_ok)

{

const char *prefix;

prefix = setup_git_directory_gently_1(nongit_ok);

if (prefix)

setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);

else

setenv(GIT_PREFIX_ENVIRONMENT, "", 1);

startup_info->have_repository = !nongit_ok || !*nongit_ok;

startup_info->prefix = prefix;

return prefix;

}

int git_config_perm(const char *var, const char *value)

{

int i;

char *endptr;

if (value == NULL)

return PERM_GROUP;

if (!strcmp(value, "umask"))

return PERM_UMASK;

if (!strcmp(value, "group"))

return PERM_GROUP;

if (!strcmp(value, "all") ||

!strcmp(value, "world") ||

!strcmp(value, "everybody"))

return PERM_EVERYBODY;

/* Parse octal numbers */

i = strtol(value, &endptr, 8);

/* If not an octal number, maybe true/false? */

if (*endptr != 0)

return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;

/*

* Treat values 0, 1 and 2 as compatibility cases, otherwise it is

* a chmod value to restrict to.

*/

switch (i) {

case PERM_UMASK: /* 0 */

return PERM_UMASK;

case OLD_PERM_GROUP: /* 1 */

return PERM_GROUP;

case OLD_PERM_EVERYBODY: /* 2 */

return PERM_EVERYBODY;

}

/* A filemode value was given: 0xxx */

if ((i & 0600) != 0600)

die(_("Problem with core.sharedRepository filemode value "

"(0%.3o).\nThe owner of files must always have "

"read and write permissions."), i);

/*

* Mask filemode value. Others can not get write permission.

* x flags for directories are handled separately.

*/

return -(i & 0666);

}

void check_repository_format(void)

{

check_repository_format_gently(get_git_dir(), NULL);

startup_info->have_repository = 1;

}

/*

* Returns the "prefix", a path to the current working directory

* relative to the work tree root, or NULL, if the current working

* directory is not a strict subdirectory of the work tree root. The

* prefix always ends with a '/' character.

*/

const char *setup_git_directory(void)

{

return setup_git_directory_gently(NULL);

}

const char *resolve_gitdir(const char *suspect)

{

if (is_git_directory(suspect))

return suspect;

return read_gitfile(suspect);

}

/* 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");

if (fd > 2)

close(fd);

}

int daemonize(void)

{

#ifdef NO_POSIX_GOODIES

errno = ENOSYS;

return -1;

#else

switch (fork()) {

case 0:

break;

case -1:

die_errno("fork failed");

default:

exit(0);

}

if (setsid() == -1)

die_errno("setsid failed");

close(0);

close(1);

close(2);

sanitize_stdfds();

return 0;

#endif

}

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