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tag: v1.6.3.3
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#include "cache.h"
#include "dir.h"

static int inside_git_dir = -1;
static int inside_work_tree = -1;

const char *prefix_path(const char *prefix, int len, const char *path)
{
const char *orig = path;
char *sanitized = xmalloc(len + strlen(path) + 1);
if (is_absolute_path(orig))
strcpy(sanitized, path);
else {
if (len)
memcpy(sanitized, prefix, len);
strcpy(sanitized + len, path);
}
if (normalize_path_copy(sanitized, sanitized))
goto error_out;
if (is_absolute_path(orig)) {
const char *work_tree = get_git_work_tree();
size_t len = strlen(work_tree);
size_t total = strlen(sanitized) + 1;
if (strncmp(sanitized, work_tree, len) ||
(sanitized[len] != '\0' && sanitized[len] != '/')) {
error_out:
die("'%s' is outside repository", orig);
}
if (sanitized[len] == '/')
len++;
memmove(sanitized, sanitized + len, total - len);
}
return sanitized;
}

/*
* Unlike prefix_path, this should be used if the named file does
* not have to interact with index entry; i.e. name of a random file
* on the filesystem.
*/
const char *prefix_filename(const char *pfx, int pfx_len, const char *arg)
{
static char path[PATH_MAX];
#ifndef __MINGW32__
if (!pfx || !*pfx || is_absolute_path(arg))
return arg;
memcpy(path, pfx, pfx_len);
strcpy(path + pfx_len, arg);
#else
char *p;
/* don't add prefix to absolute paths, but still replace '\' by '/' */
if (is_absolute_path(arg))
pfx_len = 0;
else
memcpy(path, pfx, pfx_len);
strcpy(path + pfx_len, arg);
for (p = path + pfx_len; *p; p++)
if (*p == '\\')
*p = '/';
#endif
return path;
}

/*
* 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")
*/
void verify_filename(const char *prefix, const char *arg)
{
const char *name;
struct stat st;

if (*arg == '-')
die("bad flag '%s' used after filename", arg);
name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
if (!lstat(name, &st))
return;
if (errno == ENOENT)
die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
"Use '--' to separate paths from revisions", arg);
die("'%s': %s", arg, strerror(errno));
}

/*
* 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)
{
const char *name;
struct stat st;

if (!is_inside_work_tree() || is_inside_git_dir())
return;
if (*arg == '-')
return; /* flag */
name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
if (!lstat(name, &st))
die("ambiguous argument '%s': both revision and filename\n"
"Use '--' to separate filenames from revisions", arg);
if (errno != ENOENT && errno != ENOTDIR)
die("'%s': %s", arg, strerror(errno));
}

const char **get_pathspec(const char *prefix, const char **pathspec)
{
const char *entry = *pathspec;
const char **src, **dst;
int prefixlen;

if (!prefix && !entry)
return NULL;

if (!entry) {
static const char *spec[2];
spec[0] = prefix;
spec[1] = NULL;
return spec;
}

/* Otherwise we have to re-write the entries.. */
src = pathspec;
dst = pathspec;
prefixlen = prefix ? strlen(prefix) : 0;
while (*src) {
const char *p = prefix_path(prefix, prefixlen, *src);
*(dst++) = p;
src++;
}
*dst = NULL;
if (!*pathspec)
return NULL;
return pathspec;
}

/*
* 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.
*/
static int is_git_directory(const char *suspect)
{
char path[PATH_MAX];
size_t len = strlen(suspect);

strcpy(path, suspect);
if (getenv(DB_ENVIRONMENT)) {
if (access(getenv(DB_ENVIRONMENT), X_OK))
return 0;
}
else {
strcpy(path + len, "/objects");
if (access(path, X_OK))
return 0;
}

strcpy(path + len, "/refs");
if (access(path, X_OK))
return 0;

strcpy(path + len, "/HEAD");
if (validate_headref(path))
return 0;

return 1;
}

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;
}

/*
* set_work_tree() is only ever called if you set GIT_DIR explicitely.
* The old behaviour (which we retain here) is to set the work tree root
* to the cwd, unless overridden by the config, the command line, or
* GIT_WORK_TREE.
*/
static const char *set_work_tree(const char *dir)
{
char buffer[PATH_MAX + 1];

if (!getcwd(buffer, sizeof(buffer)))
die ("Could not get the current working directory");
git_work_tree_cfg = xstrdup(buffer);
inside_work_tree = 1;

return NULL;
}

void setup_work_tree(void)
{
const char *work_tree, *git_dir;
static int initialized = 0;

if (initialized)
return;
work_tree = get_git_work_tree();
git_dir = get_git_dir();
if (!is_absolute_path(git_dir))
git_dir = make_absolute_path(git_dir);
if (!work_tree || chdir(work_tree))
die("This operation must be run in a work tree");
set_git_dir(make_relative_path(git_dir, work_tree));
initialized = 1;
}

static int check_repository_format_gently(int *nongit_ok)
{
git_config(check_repository_format_version, NULL);
if (GIT_REPO_VERSION < repository_format_version) {
if (!nongit_ok)
die ("Expected git repo version <= %d, found %d",
GIT_REPO_VERSION, repository_format_version);
warning("Expected git repo version <= %d, found %d",
GIT_REPO_VERSION, repository_format_version);
warning("Please upgrade Git");
*nongit_ok = -1;
return -1;
}
return 0;
}

/*
* Try to read the location of the git directory from the .git file,
* return path to git directory if found.
*/
const char *read_gitfile_gently(const char *path)
{
char *buf;
struct stat st;
int fd;
size_t len;

if (stat(path, &st))
return NULL;
if (!S_ISREG(st.st_mode))
return NULL;
fd = open(path, O_RDONLY);
if (fd < 0)
die("Error opening %s: %s", path, strerror(errno));
buf = xmalloc(st.st_size + 1);
len = read_in_full(fd, buf, st.st_size);
close(fd);
if (len != st.st_size)
die("Error reading %s", path);
buf[len] = '\0';
if (prefixcmp(buf, "gitdir: "))
die("Invalid gitfile format: %s", path);
while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
len--;
if (len < 9)
die("No path in gitfile: %s", path);
buf[len] = '\0';
if (!is_git_directory(buf + 8))
die("Not a git repository: %s", buf + 8);
path = make_absolute_path(buf + 8);
free(buf);
return path;
}

/*
* 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.
*/
const char *setup_git_directory_gently(int *nongit_ok)
{
const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
static char cwd[PATH_MAX+1];
const char *gitdirenv;
const char *gitfile_dir;
int len, offset, ceil_offset;

/*
* 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 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) {
if (PATH_MAX - 40 < strlen(gitdirenv))
die("'$%s' too big", GIT_DIR_ENVIRONMENT);
if (is_git_directory(gitdirenv)) {
static char buffer[1024 + 1];
const char *retval;

if (!work_tree_env) {
retval = set_work_tree(gitdirenv);
/* config may override worktree */
if (check_repository_format_gently(nongit_ok))
return NULL;
return retval;
}
if (check_repository_format_gently(nongit_ok))
return NULL;
retval = get_relative_cwd(buffer, sizeof(buffer) - 1,
get_git_work_tree());
if (!retval || !*retval)
return NULL;
set_git_dir(make_absolute_path(gitdirenv));
if (chdir(work_tree_env) < 0)
die ("Could not chdir to %s", work_tree_env);
strcat(buffer, "/");
return retval;
}
if (nongit_ok) {
*nongit_ok = 1;
return NULL;
}
die("Not a git repository: '%s'", gitdirenv);
}

if (!getcwd(cwd, sizeof(cwd)-1))
die("Unable to read current working directory");

ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs);
if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
ceil_offset = 1;

/*
* Test in the following order (relative to the cwd):
* - .git (file containing "gitdir: <path>")
* - .git/
* - ./ (bare)
* - ../.git
* - ../.git/
* - ../ (bare)
* - ../../.git/
* etc.
*/
offset = len = strlen(cwd);
for (;;) {
gitfile_dir = read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
if (gitfile_dir) {
if (set_git_dir(gitfile_dir))
die("Repository setup failed");
break;
}
if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
break;
if (is_git_directory(".")) {
inside_git_dir = 1;
if (!work_tree_env)
inside_work_tree = 0;
if (offset != len) {
cwd[offset] = '\0';
setenv(GIT_DIR_ENVIRONMENT, cwd, 1);
} else
setenv(GIT_DIR_ENVIRONMENT, ".", 1);
check_repository_format_gently(nongit_ok);
return NULL;
}
while (--offset > ceil_offset && cwd[offset] != '/');
if (offset <= ceil_offset) {
if (nongit_ok) {
if (chdir(cwd))
die("Cannot come back to cwd");
*nongit_ok = 1;
return NULL;
}
die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
}
if (chdir(".."))
die("Cannot change to %s/..: %s", cwd, strerror(errno));
}

inside_git_dir = 0;
if (!work_tree_env)
inside_work_tree = 1;
git_work_tree_cfg = xstrndup(cwd, offset);
if (check_repository_format_gently(nongit_ok))
return NULL;
if (offset == len)
return NULL;

/* Make "offset" point to past the '/', and add a '/' at the end */
offset++;
cwd[len++] = '/';
cwd[len] = 0;
return cwd + offset;
}

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);
}

int check_repository_format_version(const char *var, const char *value, void *cb)
{
if (strcmp(var, "core.repositoryformatversion") == 0)
repository_format_version = git_config_int(var, value);
else if (strcmp(var, "core.sharedrepository") == 0)
shared_repository = git_config_perm(var, value);
else if (strcmp(var, "core.bare") == 0) {
is_bare_repository_cfg = git_config_bool(var, value);
if (is_bare_repository_cfg == 1)
inside_work_tree = -1;
} else if (strcmp(var, "core.worktree") == 0) {
if (!value)
return config_error_nonbool(var);
free(git_work_tree_cfg);
git_work_tree_cfg = xstrdup(value);
inside_work_tree = -1;
}
return 0;
}

int check_repository_format(void)
{
return check_repository_format_gently(NULL);
}

const char *setup_git_directory(void)
{
const char *retval = setup_git_directory_gently(NULL);

/* If the work tree is not the default one, recompute prefix */
if (inside_work_tree < 0) {
static char buffer[PATH_MAX + 1];
char *rel;
if (retval && chdir(retval))
die ("Could not jump back into original cwd");
rel = get_relative_cwd(buffer, PATH_MAX, get_git_work_tree());
if (rel && *rel && chdir(get_git_work_tree()))
die ("Could not jump to working directory");
return rel && *rel ? strcat(rel, "/") : NULL;
}

return retval;
}
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