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-rw-r--r--setup.c506
1 files changed, 506 insertions, 0 deletions
diff --git a/setup.c b/setup.c
new file mode 100644
index 0000000000..f67250b7c1
--- /dev/null
+++ b/setup.c
@@ -0,0 +1,506 @@
+#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 WIN32
+ 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;
+}
+
+int check_filename(const char *prefix, const char *arg)
+{
+ const char *name;
+ struct stat st;
+
+ name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
+ if (!lstat(name, &st))
+ return 1; /* file exists */
+ if (errno == ENOENT || errno == ENOTDIR)
+ return 0; /* file does not exist */
+ die_errno("failed to stat '%s'", arg);
+}
+
+/*
+ * 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)
+{
+ if (*arg == '-')
+ die("bad flag '%s' used after filename", arg);
+ if (check_filename(prefix, arg))
+ return;
+ die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
+ "Use '--' to separate paths from revisions", arg);
+}
+
+/*
+ * 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)
+{
+ if (!is_inside_work_tree() || is_inside_git_dir())
+ return;
+ if (*arg == '-')
+ return; /* flag */
+ if (!check_filename(prefix, arg))
+ return;
+ die("ambiguous argument '%s': both revision and filename\n"
+ "Use '--' to separate filenames from revisions", arg);
+}
+
+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_errno("Error opening '%s'", path);
+ 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_errno ("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_errno("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_errno("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_errno("Cannot change to '%s/..'", cwd);
+ }
+
+ 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_errno ("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_errno ("Could not jump to working directory");
+ return rel && *rel ? strcat(rel, "/") : NULL;
+ }
+
+ return retval;
+}