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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;
}
/*
* 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)
die("'%s': %s", arg, strerror(errno));
}
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 a git directory.
* We want to see:
*
* - either a 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;
}
static int inside_git_dir = -1;
int is_inside_git_dir(void)
{
if (inside_git_dir >= 0)
return inside_git_dir;
die("BUG: is_inside_git_dir called before setup_git_directory");
}
static int inside_work_tree = -1;
int is_inside_work_tree(void)
{
if (inside_git_dir >= 0)
return inside_work_tree;
die("BUG: is_inside_work_tree called before setup_git_directory");
}
static char *gitworktree_config;
static int git_setup_config(const char *var, const char *value)
{
if (!strcmp(var, "core.worktree")) {
if (gitworktree_config)
strlcpy(gitworktree_config, value, PATH_MAX);
return 0;
}
return git_default_config(var, value);
}
const char *setup_git_directory_gently(int *nongit_ok)
{
static char cwd[PATH_MAX+1];
char worktree[PATH_MAX+1], gitdir[PATH_MAX+1];
const char *gitdirenv, *gitworktree;
int wt_rel_gitdir = 0;
gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
if (!gitdirenv) {
int len, offset;
if (!getcwd(cwd, sizeof(cwd)-1) || cwd[0] != '/')
die("Unable to read current working directory");
offset = len = strlen(cwd);
for (;;) {
if (is_git_directory(".git"))
break;
if (offset == 0) {
offset = -1;
break;
}
chdir("..");
while (cwd[--offset] != '/')
; /* do nothing */
}
if (offset >= 0) {
inside_work_tree = 1;
git_config(git_default_config);
if (offset == len) {
inside_git_dir = 0;
return NULL;
}
cwd[len++] = '/';
cwd[len] = '\0';
inside_git_dir = !prefixcmp(cwd + offset + 1, ".git/");
return cwd + offset + 1;
}
if (chdir(cwd))
die("Cannot come back to cwd");
if (!is_git_directory(".")) {
if (nongit_ok) {
*nongit_ok = 1;
return NULL;
}
die("Not a git repository");
}
setenv(GIT_DIR_ENVIRONMENT, cwd, 1);
gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
if (!gitdirenv)
die("getenv after setenv failed");
}
if (PATH_MAX - 40 < strlen(gitdirenv)) {
if (nongit_ok) {
*nongit_ok = 1;
return NULL;
}
die("$%s too big", GIT_DIR_ENVIRONMENT);
}
if (!is_git_directory(gitdirenv)) {
if (nongit_ok) {
*nongit_ok = 1;
return NULL;
}
die("Not a git repository: '%s'", gitdirenv);
}
if (!getcwd(cwd, sizeof(cwd)-1) || cwd[0] != '/')
die("Unable to read current working directory");
if (chdir(gitdirenv)) {
if (nongit_ok) {
*nongit_ok = 1;
return NULL;
}
die("Cannot change directory to $%s '%s'",
GIT_DIR_ENVIRONMENT, gitdirenv);
}
if (!getcwd(gitdir, sizeof(gitdir)-1) || gitdir[0] != '/')
die("Unable to read current working directory");
if (chdir(cwd))
die("Cannot come back to cwd");
/*
* In case there is a work tree we may change the directory,
* therefore make GIT_DIR an absolute path.
*/
if (gitdirenv[0] != '/') {
setenv(GIT_DIR_ENVIRONMENT, gitdir, 1);
gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
if (!gitdirenv)
die("getenv after setenv failed");
if (PATH_MAX - 40 < strlen(gitdirenv)) {
if (nongit_ok) {
*nongit_ok = 1;
return NULL;
}
die("$%s too big after expansion to absolute path",
GIT_DIR_ENVIRONMENT);
}
}
strcat(cwd, "/");
strcat(gitdir, "/");
inside_git_dir = !prefixcmp(cwd, gitdir);
gitworktree = getenv(GIT_WORK_TREE_ENVIRONMENT);
if (!gitworktree) {
gitworktree_config = worktree;
worktree[0] = '\0';
}
git_config(git_setup_config);
if (!gitworktree) {
gitworktree_config = NULL;
if (worktree[0])
gitworktree = worktree;
if (gitworktree && gitworktree[0] != '/')
wt_rel_gitdir = 1;
}
if (wt_rel_gitdir && chdir(gitdirenv))
die("Cannot change directory to $%s '%s'",
GIT_DIR_ENVIRONMENT, gitdirenv);
if (gitworktree && chdir(gitworktree)) {
if (nongit_ok) {
if (wt_rel_gitdir && chdir(cwd))
die("Cannot come back to cwd");
*nongit_ok = 1;
return NULL;
}
if (wt_rel_gitdir)
die("Cannot change directory to working tree '%s'"
" from $%s", gitworktree, GIT_DIR_ENVIRONMENT);
else
die("Cannot change directory to working tree '%s'",
gitworktree);
}
if (!getcwd(worktree, sizeof(worktree)-1) || worktree[0] != '/')
die("Unable to read current working directory");
strcat(worktree, "/");
inside_work_tree = !prefixcmp(cwd, worktree);
if (gitworktree && inside_work_tree && !prefixcmp(worktree, gitdir) &&
strcmp(worktree, gitdir)) {
inside_git_dir = 0;
}
if (!inside_work_tree) {
if (chdir(cwd))
die("Cannot come back to cwd");
return NULL;
}
if (!strcmp(cwd, worktree))
return NULL;
return cwd+strlen(worktree);
}
int git_config_perm(const char *var, const char *value)
{
if (value) {
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;
}
return git_config_bool(var, value);
}
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);
else if (strcmp(var, "core.sharedrepository") == 0)
shared_repository = git_config_perm(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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