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tag: v1.0.10
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#include "cache.h"

const char *prefix_path(const char *prefix, int len, const char *path)
{
const char *orig = path;
for (;;) {
char c;
if (*path != '.')
break;
c = path[1];
/* "." */
if (!c) {
path++;
break;
}
/* "./" */
if (c == '/') {
path += 2;
continue;
}
if (c != '.')
break;
c = path[2];
if (!c)
path += 2;
else if (c == '/')
path += 3;
else
break;
/* ".." and "../" */
/* Remove last component of the prefix */
do {
if (!len)
die("'%s' is outside repository", orig);
len--;
} while (len && prefix[len-1] != '/');
continue;
}
if (len) {
int speclen = strlen(path);
char *n = xmalloc(speclen + len + 1);

memcpy(n, prefix, len);
memcpy(n + len, path, speclen+1);
path = n;
}
return path;
}

/*
* 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];
if (!pfx || !*pfx || arg[0] == '/')
return arg;
memcpy(path, pfx, pfx_len);
strcpy(path + pfx_len, arg);
return path;
}

const char **get_pathspec(const char *prefix, const char **pathspec)
{
const char *entry = *pathspec;
const char **p;
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.. */
p = pathspec;
prefixlen = prefix ? strlen(prefix) : 0;
do {
*p = prefix_path(prefix, prefixlen, entry);
} while ((entry = *++p) != NULL);
return (const char **) pathspec;
}

/*
* Test if it looks like we're at the top level git directory.
* We want to see:
*
* - either a .git/objects/ directory _or_ the proper
* GIT_OBJECT_DIRECTORY environment variable
* - a refs/ directory under ".git"
* - either a HEAD symlink or a HEAD file that is formatted as
* a proper "ref:".
*/
static int is_toplevel_directory(void)
{
if (access(".git/refs/", X_OK) ||
access(getenv(DB_ENVIRONMENT) ?
getenv(DB_ENVIRONMENT) : ".git/objects/", X_OK) ||
validate_symref(".git/HEAD"))
return 0;
return 1;
}

const char *setup_git_directory_gently(int *nongit_ok)
{
static char cwd[PATH_MAX+1];
int len, offset;

/*
* If GIT_DIR is set explicitly, we're not going
* to do any discovery, but we still do repository
* validation.
*/
if (getenv(GIT_DIR_ENVIRONMENT)) {
char path[PATH_MAX];
int len = strlen(getenv(GIT_DIR_ENVIRONMENT));
if (sizeof(path) - 40 < len)
die("'$%s' too big", GIT_DIR_ENVIRONMENT);
memcpy(path, getenv(GIT_DIR_ENVIRONMENT), len);

strcpy(path + len, "/refs");
if (access(path, X_OK))
goto bad_dir_environ;
strcpy(path + len, "/HEAD");
if (validate_symref(path))
goto bad_dir_environ;
if (getenv(DB_ENVIRONMENT)) {
if (access(getenv(DB_ENVIRONMENT), X_OK))
goto bad_dir_environ;
}
else {
strcpy(path + len, "/objects");
if (access(path, X_OK))
goto bad_dir_environ;
}
return NULL;
bad_dir_environ:
path[len] = 0;
die("Not a git repository: '%s'", path);
}

if (!getcwd(cwd, sizeof(cwd)) || cwd[0] != '/')
die("Unable to read current working directory");

offset = len = strlen(cwd);
for (;;) {
if (is_toplevel_directory())
break;
chdir("..");
do {
if (!offset) {
if (nongit_ok) {
if (chdir(cwd))
die("Cannot come back to cwd");
*nongit_ok = 1;
return NULL;
}
die("Not a git repository");
}
} while (cwd[--offset] != '/');
}

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 check_repository_format_version(const char *var, const char *value)
{
       if (strcmp(var, "core.repositoryformatversion") == 0)
               repository_format_version = git_config_int(var, value);
       return 0;
}

int check_repository_format(void)
{
git_config(check_repository_format_version);
if (GIT_REPO_VERSION < repository_format_version)
die ("Expected git repo version <= %d, found %d",
GIT_REPO_VERSION, repository_format_version);
return 0;
}

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