#include "cache.h"
-char *prefix_path(const char *prefix, int len, char *path)
+const char *prefix_path(const char *prefix, int len, const char *path)
{
- char *orig = path;
+ const char *orig = path;
for (;;) {
char c;
if (*path != '.')
return path;
}
-const char **get_pathspec(const char *prefix, char **pathspec)
+/*
+ * 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)
{
- char *entry = *pathspec;
- char **p;
+ 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 (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/refs/ subdirectory
- */
- if (!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);
+ 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;
+}