#include "cache.h"
-const char **get_pathspec(const char *prefix, char **pathspec)
+const char *prefix_path(const char *prefix, int len, const char *path)
{
- char *entry = *pathspec;
- char **p;
- int prefixlen;
-
- if (!prefix) {
- char **p;
- if (!entry)
- return NULL;
- p = pathspec;
+ 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 (*entry != '.')
- continue;
- /* fixup ? */
- } while ((entry = *++p) != NULL);
- return (const char **) pathspec;
+ 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];
}
/* Otherwise we have to re-write the entries.. */
- prefixlen = strlen(prefix);
p = pathspec;
+ prefixlen = prefix ? strlen(prefix) : 0;
do {
- int speclen, len = prefixlen;
- char *n;
-
- for (;;) {
- if (!strcmp(entry, ".")) {
- entry++;
- break;
- }
- if (!strncmp(entry, "./", 2)) {
- entry += 2;
- continue;
- }
- if (!strncmp(entry, "../", 3)) {
- do {
- if (!len)
- die("'%s' is outside repository", *p);
- len--;
- } while (len && prefix[len-1] != '/');
- entry += 3;
- continue;
- }
- break;
- }
- speclen = strlen(entry);
- n = xmalloc(speclen + len + 1);
-
- memcpy(n, prefix, len);
- memcpy(n + len, entry, speclen+1);
- *p = n;
+ *p = prefix_path(prefix, prefixlen, entry);
} while ((entry = *++p) != NULL);
return (const char **) pathspec;
}
-const char *setup_git_directory(void)
+/*
+ * 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
+ * to do any discovery, but we still do repository
+ * validation.
*/
- if (gitenv(GIT_DIR_ENVIRONMENT))
+ 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 (;;) {
- /*
- * We always want to see a .git/HEAD and a .git/refs/
- * subdirectory
- */
- if (!access(".git/HEAD", R_OK) && !access(".git/refs/", X_OK)) {
- /*
- * Then we need either a GIT_OBJECT_DIRECTORY define
- * or a .git/objects/ directory
- */
- if (gitenv(DB_ENVIRONMENT) || !access(".git/objects/", X_OK))
- break;
- }
+ if (is_toplevel_directory())
+ break;
chdir("..");
do {
- if (!offset)
+ 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] != '/');
}
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);
+ else if (strcmp(var, "core.sharedrepository") == 0)
+ shared_repository = git_config_bool(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;
+}