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https://github.com/git/git
synced 2024-08-27 11:39:22 +00:00
![Junio C Hamano](/assets/img/avatar_default.png)
Start "git config --edit --global" from a skeletal per-user configuration file contents, instead of a total blank, when the user does not already have any. This immediately reduces the need for a later "Have you forgotten setting core.user?" and we can add more to the template as we gain more experience. * mm/config-edit-global: commit: advertise config --global --edit on guessed identity home_config_paths(): let the caller ignore xdg path config --global --edit: create a template file if needed
826 lines
18 KiB
C
826 lines
18 KiB
C
/*
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* Utilities for paths and pathnames
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*/
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#include "cache.h"
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#include "strbuf.h"
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#include "string-list.h"
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static int get_st_mode_bits(const char *path, int *mode)
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{
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struct stat st;
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if (lstat(path, &st) < 0)
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return -1;
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*mode = st.st_mode;
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return 0;
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}
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static char bad_path[] = "/bad-path/";
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static char *get_pathname(void)
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{
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static char pathname_array[4][PATH_MAX];
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static int index;
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return pathname_array[3 & ++index];
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}
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static char *cleanup_path(char *path)
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{
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/* Clean it up */
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if (!memcmp(path, "./", 2)) {
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path += 2;
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while (*path == '/')
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path++;
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}
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return path;
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}
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char *mksnpath(char *buf, size_t n, const char *fmt, ...)
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{
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va_list args;
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unsigned len;
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va_start(args, fmt);
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len = vsnprintf(buf, n, fmt, args);
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va_end(args);
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if (len >= n) {
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strlcpy(buf, bad_path, n);
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return buf;
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}
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return cleanup_path(buf);
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}
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static char *vsnpath(char *buf, size_t n, const char *fmt, va_list args)
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{
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const char *git_dir = get_git_dir();
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size_t len;
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len = strlen(git_dir);
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if (n < len + 1)
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goto bad;
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memcpy(buf, git_dir, len);
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if (len && !is_dir_sep(git_dir[len-1]))
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buf[len++] = '/';
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len += vsnprintf(buf + len, n - len, fmt, args);
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if (len >= n)
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goto bad;
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return cleanup_path(buf);
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bad:
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strlcpy(buf, bad_path, n);
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return buf;
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}
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char *git_snpath(char *buf, size_t n, const char *fmt, ...)
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{
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char *ret;
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va_list args;
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va_start(args, fmt);
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ret = vsnpath(buf, n, fmt, args);
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va_end(args);
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return ret;
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}
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char *git_pathdup(const char *fmt, ...)
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{
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char path[PATH_MAX], *ret;
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va_list args;
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va_start(args, fmt);
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ret = vsnpath(path, sizeof(path), fmt, args);
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va_end(args);
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return xstrdup(ret);
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}
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char *mkpathdup(const char *fmt, ...)
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{
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char *path;
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struct strbuf sb = STRBUF_INIT;
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va_list args;
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va_start(args, fmt);
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strbuf_vaddf(&sb, fmt, args);
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va_end(args);
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path = xstrdup(cleanup_path(sb.buf));
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strbuf_release(&sb);
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return path;
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}
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char *mkpath(const char *fmt, ...)
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{
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va_list args;
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unsigned len;
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char *pathname = get_pathname();
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va_start(args, fmt);
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len = vsnprintf(pathname, PATH_MAX, fmt, args);
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va_end(args);
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if (len >= PATH_MAX)
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return bad_path;
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return cleanup_path(pathname);
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}
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char *git_path(const char *fmt, ...)
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{
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char *pathname = get_pathname();
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va_list args;
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char *ret;
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va_start(args, fmt);
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ret = vsnpath(pathname, PATH_MAX, fmt, args);
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va_end(args);
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return ret;
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}
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void home_config_paths(char **global, char **xdg, char *file)
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{
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char *xdg_home = getenv("XDG_CONFIG_HOME");
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char *home = getenv("HOME");
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char *to_free = NULL;
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if (!home) {
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if (global)
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*global = NULL;
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} else {
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if (!xdg_home) {
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to_free = mkpathdup("%s/.config", home);
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xdg_home = to_free;
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}
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if (global)
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*global = mkpathdup("%s/.gitconfig", home);
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}
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if (xdg) {
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if (!xdg_home)
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*xdg = NULL;
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else
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*xdg = mkpathdup("%s/git/%s", xdg_home, file);
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}
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free(to_free);
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}
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char *git_path_submodule(const char *path, const char *fmt, ...)
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{
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char *pathname = get_pathname();
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struct strbuf buf = STRBUF_INIT;
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const char *git_dir;
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va_list args;
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unsigned len;
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len = strlen(path);
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if (len > PATH_MAX-100)
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return bad_path;
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strbuf_addstr(&buf, path);
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if (len && path[len-1] != '/')
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strbuf_addch(&buf, '/');
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strbuf_addstr(&buf, ".git");
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git_dir = read_gitfile(buf.buf);
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if (git_dir) {
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strbuf_reset(&buf);
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strbuf_addstr(&buf, git_dir);
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}
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strbuf_addch(&buf, '/');
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if (buf.len >= PATH_MAX)
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return bad_path;
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memcpy(pathname, buf.buf, buf.len + 1);
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strbuf_release(&buf);
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len = strlen(pathname);
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va_start(args, fmt);
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len += vsnprintf(pathname + len, PATH_MAX - len, fmt, args);
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va_end(args);
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if (len >= PATH_MAX)
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return bad_path;
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return cleanup_path(pathname);
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}
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int validate_headref(const char *path)
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{
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struct stat st;
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char *buf, buffer[256];
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unsigned char sha1[20];
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int fd;
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ssize_t len;
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if (lstat(path, &st) < 0)
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return -1;
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/* Make sure it is a "refs/.." symlink */
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if (S_ISLNK(st.st_mode)) {
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len = readlink(path, buffer, sizeof(buffer)-1);
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if (len >= 5 && !memcmp("refs/", buffer, 5))
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return 0;
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return -1;
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}
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/*
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* Anything else, just open it and try to see if it is a symbolic ref.
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*/
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fd = open(path, O_RDONLY);
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if (fd < 0)
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return -1;
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len = read_in_full(fd, buffer, sizeof(buffer)-1);
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close(fd);
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/*
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* Is it a symbolic ref?
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*/
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if (len < 4)
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return -1;
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if (!memcmp("ref:", buffer, 4)) {
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buf = buffer + 4;
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len -= 4;
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while (len && isspace(*buf))
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buf++, len--;
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if (len >= 5 && !memcmp("refs/", buf, 5))
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return 0;
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}
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/*
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* Is this a detached HEAD?
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*/
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if (!get_sha1_hex(buffer, sha1))
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return 0;
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return -1;
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}
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static struct passwd *getpw_str(const char *username, size_t len)
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{
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struct passwd *pw;
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char *username_z = xmemdupz(username, len);
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pw = getpwnam(username_z);
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free(username_z);
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return pw;
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}
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/*
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* Return a string with ~ and ~user expanded via getpw*. If buf != NULL,
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* then it is a newly allocated string. Returns NULL on getpw failure or
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* if path is NULL.
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*/
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char *expand_user_path(const char *path)
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{
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struct strbuf user_path = STRBUF_INIT;
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const char *to_copy = path;
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if (path == NULL)
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goto return_null;
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if (path[0] == '~') {
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const char *first_slash = strchrnul(path, '/');
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const char *username = path + 1;
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size_t username_len = first_slash - username;
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if (username_len == 0) {
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const char *home = getenv("HOME");
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if (!home)
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goto return_null;
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strbuf_addstr(&user_path, home);
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} else {
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struct passwd *pw = getpw_str(username, username_len);
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if (!pw)
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goto return_null;
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strbuf_addstr(&user_path, pw->pw_dir);
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}
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to_copy = first_slash;
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}
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strbuf_addstr(&user_path, to_copy);
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return strbuf_detach(&user_path, NULL);
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return_null:
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strbuf_release(&user_path);
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return NULL;
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}
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/*
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* First, one directory to try is determined by the following algorithm.
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*
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* (0) If "strict" is given, the path is used as given and no DWIM is
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* done. Otherwise:
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* (1) "~/path" to mean path under the running user's home directory;
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* (2) "~user/path" to mean path under named user's home directory;
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* (3) "relative/path" to mean cwd relative directory; or
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* (4) "/absolute/path" to mean absolute directory.
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*
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* Unless "strict" is given, we try access() for existence of "%s.git/.git",
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* "%s/.git", "%s.git", "%s" in this order. The first one that exists is
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* what we try.
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*
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* Second, we try chdir() to that. Upon failure, we return NULL.
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*
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* Then, we try if the current directory is a valid git repository.
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* Upon failure, we return NULL.
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*
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* If all goes well, we return the directory we used to chdir() (but
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* before ~user is expanded), avoiding getcwd() resolving symbolic
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* links. User relative paths are also returned as they are given,
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* except DWIM suffixing.
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*/
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const char *enter_repo(const char *path, int strict)
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{
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static char used_path[PATH_MAX];
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static char validated_path[PATH_MAX];
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if (!path)
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return NULL;
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if (!strict) {
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static const char *suffix[] = {
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"/.git", "", ".git/.git", ".git", NULL,
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};
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const char *gitfile;
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int len = strlen(path);
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int i;
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while ((1 < len) && (path[len-1] == '/'))
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len--;
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if (PATH_MAX <= len)
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return NULL;
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strncpy(used_path, path, len); used_path[len] = 0 ;
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strcpy(validated_path, used_path);
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if (used_path[0] == '~') {
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char *newpath = expand_user_path(used_path);
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if (!newpath || (PATH_MAX - 10 < strlen(newpath))) {
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free(newpath);
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return NULL;
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}
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/*
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* Copy back into the static buffer. A pity
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* since newpath was not bounded, but other
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* branches of the if are limited by PATH_MAX
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* anyway.
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*/
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strcpy(used_path, newpath); free(newpath);
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}
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else if (PATH_MAX - 10 < len)
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return NULL;
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len = strlen(used_path);
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for (i = 0; suffix[i]; i++) {
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struct stat st;
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strcpy(used_path + len, suffix[i]);
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if (!stat(used_path, &st) &&
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(S_ISREG(st.st_mode) ||
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(S_ISDIR(st.st_mode) && is_git_directory(used_path)))) {
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strcat(validated_path, suffix[i]);
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break;
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}
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}
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if (!suffix[i])
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return NULL;
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gitfile = read_gitfile(used_path) ;
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if (gitfile)
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strcpy(used_path, gitfile);
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if (chdir(used_path))
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return NULL;
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path = validated_path;
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}
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else if (chdir(path))
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return NULL;
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if (access("objects", X_OK) == 0 && access("refs", X_OK) == 0 &&
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validate_headref("HEAD") == 0) {
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set_git_dir(".");
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check_repository_format();
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return path;
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}
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return NULL;
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}
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|
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static int calc_shared_perm(int mode)
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{
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int tweak;
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if (shared_repository < 0)
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tweak = -shared_repository;
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else
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tweak = shared_repository;
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if (!(mode & S_IWUSR))
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tweak &= ~0222;
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if (mode & S_IXUSR)
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/* Copy read bits to execute bits */
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tweak |= (tweak & 0444) >> 2;
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if (shared_repository < 0)
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mode = (mode & ~0777) | tweak;
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else
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mode |= tweak;
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return mode;
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}
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|
|
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int adjust_shared_perm(const char *path)
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{
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int old_mode, new_mode;
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|
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if (!shared_repository)
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return 0;
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if (get_st_mode_bits(path, &old_mode) < 0)
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return -1;
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new_mode = calc_shared_perm(old_mode);
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if (S_ISDIR(old_mode)) {
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/* Copy read bits to execute bits */
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new_mode |= (new_mode & 0444) >> 2;
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new_mode |= FORCE_DIR_SET_GID;
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}
|
|
|
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if (((old_mode ^ new_mode) & ~S_IFMT) &&
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chmod(path, (new_mode & ~S_IFMT)) < 0)
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return -2;
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return 0;
|
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}
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|
|
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static int have_same_root(const char *path1, const char *path2)
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{
|
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int is_abs1, is_abs2;
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|
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is_abs1 = is_absolute_path(path1);
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is_abs2 = is_absolute_path(path2);
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return (is_abs1 && is_abs2 && tolower(path1[0]) == tolower(path2[0])) ||
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(!is_abs1 && !is_abs2);
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}
|
|
|
|
/*
|
|
* Give path as relative to prefix.
|
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*
|
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* The strbuf may or may not be used, so do not assume it contains the
|
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* returned path.
|
|
*/
|
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const char *relative_path(const char *in, const char *prefix,
|
|
struct strbuf *sb)
|
|
{
|
|
int in_len = in ? strlen(in) : 0;
|
|
int prefix_len = prefix ? strlen(prefix) : 0;
|
|
int in_off = 0;
|
|
int prefix_off = 0;
|
|
int i = 0, j = 0;
|
|
|
|
if (!in_len)
|
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return "./";
|
|
else if (!prefix_len)
|
|
return in;
|
|
|
|
if (have_same_root(in, prefix)) {
|
|
/* bypass dos_drive, for "c:" is identical to "C:" */
|
|
if (has_dos_drive_prefix(in)) {
|
|
i = 2;
|
|
j = 2;
|
|
}
|
|
} else {
|
|
return in;
|
|
}
|
|
|
|
while (i < prefix_len && j < in_len && prefix[i] == in[j]) {
|
|
if (is_dir_sep(prefix[i])) {
|
|
while (is_dir_sep(prefix[i]))
|
|
i++;
|
|
while (is_dir_sep(in[j]))
|
|
j++;
|
|
prefix_off = i;
|
|
in_off = j;
|
|
} else {
|
|
i++;
|
|
j++;
|
|
}
|
|
}
|
|
|
|
if (
|
|
/* "prefix" seems like prefix of "in" */
|
|
i >= prefix_len &&
|
|
/*
|
|
* but "/foo" is not a prefix of "/foobar"
|
|
* (i.e. prefix not end with '/')
|
|
*/
|
|
prefix_off < prefix_len) {
|
|
if (j >= in_len) {
|
|
/* in="/a/b", prefix="/a/b" */
|
|
in_off = in_len;
|
|
} else if (is_dir_sep(in[j])) {
|
|
/* in="/a/b/c", prefix="/a/b" */
|
|
while (is_dir_sep(in[j]))
|
|
j++;
|
|
in_off = j;
|
|
} else {
|
|
/* in="/a/bbb/c", prefix="/a/b" */
|
|
i = prefix_off;
|
|
}
|
|
} else if (
|
|
/* "in" is short than "prefix" */
|
|
j >= in_len &&
|
|
/* "in" not end with '/' */
|
|
in_off < in_len) {
|
|
if (is_dir_sep(prefix[i])) {
|
|
/* in="/a/b", prefix="/a/b/c/" */
|
|
while (is_dir_sep(prefix[i]))
|
|
i++;
|
|
in_off = in_len;
|
|
}
|
|
}
|
|
in += in_off;
|
|
in_len -= in_off;
|
|
|
|
if (i >= prefix_len) {
|
|
if (!in_len)
|
|
return "./";
|
|
else
|
|
return in;
|
|
}
|
|
|
|
strbuf_reset(sb);
|
|
strbuf_grow(sb, in_len);
|
|
|
|
while (i < prefix_len) {
|
|
if (is_dir_sep(prefix[i])) {
|
|
strbuf_addstr(sb, "../");
|
|
while (is_dir_sep(prefix[i]))
|
|
i++;
|
|
continue;
|
|
}
|
|
i++;
|
|
}
|
|
if (!is_dir_sep(prefix[prefix_len - 1]))
|
|
strbuf_addstr(sb, "../");
|
|
|
|
strbuf_addstr(sb, in);
|
|
|
|
return sb->buf;
|
|
}
|
|
|
|
/*
|
|
* A simpler implementation of relative_path
|
|
*
|
|
* Get relative path by removing "prefix" from "in". This function
|
|
* first appears in v1.5.6-1-g044bbbc, and makes git_dir shorter
|
|
* to increase performance when traversing the path to work_tree.
|
|
*/
|
|
const char *remove_leading_path(const char *in, const char *prefix)
|
|
{
|
|
static char buf[PATH_MAX + 1];
|
|
int i = 0, j = 0;
|
|
|
|
if (!prefix || !prefix[0])
|
|
return in;
|
|
while (prefix[i]) {
|
|
if (is_dir_sep(prefix[i])) {
|
|
if (!is_dir_sep(in[j]))
|
|
return in;
|
|
while (is_dir_sep(prefix[i]))
|
|
i++;
|
|
while (is_dir_sep(in[j]))
|
|
j++;
|
|
continue;
|
|
} else if (in[j] != prefix[i]) {
|
|
return in;
|
|
}
|
|
i++;
|
|
j++;
|
|
}
|
|
if (
|
|
/* "/foo" is a prefix of "/foo" */
|
|
in[j] &&
|
|
/* "/foo" is not a prefix of "/foobar" */
|
|
!is_dir_sep(prefix[i-1]) && !is_dir_sep(in[j])
|
|
)
|
|
return in;
|
|
while (is_dir_sep(in[j]))
|
|
j++;
|
|
if (!in[j])
|
|
strcpy(buf, ".");
|
|
else
|
|
strcpy(buf, in + j);
|
|
return buf;
|
|
}
|
|
|
|
/*
|
|
* It is okay if dst == src, but they should not overlap otherwise.
|
|
*
|
|
* Performs the following normalizations on src, storing the result in dst:
|
|
* - Ensures that components are separated by '/' (Windows only)
|
|
* - Squashes sequences of '/'.
|
|
* - Removes "." components.
|
|
* - Removes ".." components, and the components the precede them.
|
|
* Returns failure (non-zero) if a ".." component appears as first path
|
|
* component anytime during the normalization. Otherwise, returns success (0).
|
|
*
|
|
* Note that this function is purely textual. It does not follow symlinks,
|
|
* verify the existence of the path, or make any system calls.
|
|
*
|
|
* prefix_len != NULL is for a specific case of prefix_pathspec():
|
|
* assume that src == dst and src[0..prefix_len-1] is already
|
|
* normalized, any time "../" eats up to the prefix_len part,
|
|
* prefix_len is reduced. In the end prefix_len is the remaining
|
|
* prefix that has not been overridden by user pathspec.
|
|
*/
|
|
int normalize_path_copy_len(char *dst, const char *src, int *prefix_len)
|
|
{
|
|
char *dst0;
|
|
|
|
if (has_dos_drive_prefix(src)) {
|
|
*dst++ = *src++;
|
|
*dst++ = *src++;
|
|
}
|
|
dst0 = dst;
|
|
|
|
if (is_dir_sep(*src)) {
|
|
*dst++ = '/';
|
|
while (is_dir_sep(*src))
|
|
src++;
|
|
}
|
|
|
|
for (;;) {
|
|
char c = *src;
|
|
|
|
/*
|
|
* A path component that begins with . could be
|
|
* special:
|
|
* (1) "." and ends -- ignore and terminate.
|
|
* (2) "./" -- ignore them, eat slash and continue.
|
|
* (3) ".." and ends -- strip one and terminate.
|
|
* (4) "../" -- strip one, eat slash and continue.
|
|
*/
|
|
if (c == '.') {
|
|
if (!src[1]) {
|
|
/* (1) */
|
|
src++;
|
|
} else if (is_dir_sep(src[1])) {
|
|
/* (2) */
|
|
src += 2;
|
|
while (is_dir_sep(*src))
|
|
src++;
|
|
continue;
|
|
} else if (src[1] == '.') {
|
|
if (!src[2]) {
|
|
/* (3) */
|
|
src += 2;
|
|
goto up_one;
|
|
} else if (is_dir_sep(src[2])) {
|
|
/* (4) */
|
|
src += 3;
|
|
while (is_dir_sep(*src))
|
|
src++;
|
|
goto up_one;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* copy up to the next '/', and eat all '/' */
|
|
while ((c = *src++) != '\0' && !is_dir_sep(c))
|
|
*dst++ = c;
|
|
if (is_dir_sep(c)) {
|
|
*dst++ = '/';
|
|
while (is_dir_sep(c))
|
|
c = *src++;
|
|
src--;
|
|
} else if (!c)
|
|
break;
|
|
continue;
|
|
|
|
up_one:
|
|
/*
|
|
* dst0..dst is prefix portion, and dst[-1] is '/';
|
|
* go up one level.
|
|
*/
|
|
dst--; /* go to trailing '/' */
|
|
if (dst <= dst0)
|
|
return -1;
|
|
/* Windows: dst[-1] cannot be backslash anymore */
|
|
while (dst0 < dst && dst[-1] != '/')
|
|
dst--;
|
|
if (prefix_len && *prefix_len > dst - dst0)
|
|
*prefix_len = dst - dst0;
|
|
}
|
|
*dst = '\0';
|
|
return 0;
|
|
}
|
|
|
|
int normalize_path_copy(char *dst, const char *src)
|
|
{
|
|
return normalize_path_copy_len(dst, src, NULL);
|
|
}
|
|
|
|
/*
|
|
* path = Canonical absolute path
|
|
* prefixes = string_list containing normalized, absolute paths without
|
|
* trailing slashes (except for the root directory, which is denoted by "/").
|
|
*
|
|
* Determines, for each path in prefixes, whether the "prefix"
|
|
* is an ancestor directory of path. Returns the length of the longest
|
|
* ancestor directory, excluding any trailing slashes, or -1 if no prefix
|
|
* is an ancestor. (Note that this means 0 is returned if prefixes is
|
|
* ["/"].) "/foo" is not considered an ancestor of "/foobar". Directories
|
|
* are not considered to be their own ancestors. path must be in a
|
|
* canonical form: empty components, or "." or ".." components are not
|
|
* allowed.
|
|
*/
|
|
int longest_ancestor_length(const char *path, struct string_list *prefixes)
|
|
{
|
|
int i, max_len = -1;
|
|
|
|
if (!strcmp(path, "/"))
|
|
return -1;
|
|
|
|
for (i = 0; i < prefixes->nr; i++) {
|
|
const char *ceil = prefixes->items[i].string;
|
|
int len = strlen(ceil);
|
|
|
|
if (len == 1 && ceil[0] == '/')
|
|
len = 0; /* root matches anything, with length 0 */
|
|
else if (!strncmp(path, ceil, len) && path[len] == '/')
|
|
; /* match of length len */
|
|
else
|
|
continue; /* no match */
|
|
|
|
if (len > max_len)
|
|
max_len = len;
|
|
}
|
|
|
|
return max_len;
|
|
}
|
|
|
|
/* strip arbitrary amount of directory separators at end of path */
|
|
static inline int chomp_trailing_dir_sep(const char *path, int len)
|
|
{
|
|
while (len && is_dir_sep(path[len - 1]))
|
|
len--;
|
|
return len;
|
|
}
|
|
|
|
/*
|
|
* If path ends with suffix (complete path components), returns the
|
|
* part before suffix (sans trailing directory separators).
|
|
* Otherwise returns NULL.
|
|
*/
|
|
char *strip_path_suffix(const char *path, const char *suffix)
|
|
{
|
|
int path_len = strlen(path), suffix_len = strlen(suffix);
|
|
|
|
while (suffix_len) {
|
|
if (!path_len)
|
|
return NULL;
|
|
|
|
if (is_dir_sep(path[path_len - 1])) {
|
|
if (!is_dir_sep(suffix[suffix_len - 1]))
|
|
return NULL;
|
|
path_len = chomp_trailing_dir_sep(path, path_len);
|
|
suffix_len = chomp_trailing_dir_sep(suffix, suffix_len);
|
|
}
|
|
else if (path[--path_len] != suffix[--suffix_len])
|
|
return NULL;
|
|
}
|
|
|
|
if (path_len && !is_dir_sep(path[path_len - 1]))
|
|
return NULL;
|
|
return xstrndup(path, chomp_trailing_dir_sep(path, path_len));
|
|
}
|
|
|
|
int daemon_avoid_alias(const char *p)
|
|
{
|
|
int sl, ndot;
|
|
|
|
/*
|
|
* This resurrects the belts and suspenders paranoia check by HPA
|
|
* done in <435560F7.4080006@zytor.com> thread, now enter_repo()
|
|
* does not do getcwd() based path canonicalization.
|
|
*
|
|
* sl becomes true immediately after seeing '/' and continues to
|
|
* be true as long as dots continue after that without intervening
|
|
* non-dot character.
|
|
*/
|
|
if (!p || (*p != '/' && *p != '~'))
|
|
return -1;
|
|
sl = 1; ndot = 0;
|
|
p++;
|
|
|
|
while (1) {
|
|
char ch = *p++;
|
|
if (sl) {
|
|
if (ch == '.')
|
|
ndot++;
|
|
else if (ch == '/') {
|
|
if (ndot < 3)
|
|
/* reject //, /./ and /../ */
|
|
return -1;
|
|
ndot = 0;
|
|
}
|
|
else if (ch == 0) {
|
|
if (0 < ndot && ndot < 3)
|
|
/* reject /.$ and /..$ */
|
|
return -1;
|
|
return 0;
|
|
}
|
|
else
|
|
sl = ndot = 0;
|
|
}
|
|
else if (ch == 0)
|
|
return 0;
|
|
else if (ch == '/') {
|
|
sl = 1;
|
|
ndot = 0;
|
|
}
|
|
}
|
|
}
|