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#include "cache.h" /* * Do not use this for inspecting *tracked* content. When path is a * symlink to a directory, we do not want to say it is a directory when * dealing with tracked content in the working tree. */ int is_directory(const char *path) { struct stat st; return (!stat(path, &st) && S_ISDIR(st.st_mode)); } /* We allow "recursive" symbolic links. Only within reason, though. */ #define MAXDEPTH 5 /* * Return the real path (i.e., absolute path, with symlinks resolved * and extra slashes removed) equivalent to the specified path. (If * you want an absolute path but don't mind links, use * absolute_path().) The return value is a pointer to a static * buffer. * * The input and all intermediate paths must be shorter than MAX_PATH. * The directory part of path (i.e., everything up to the last * dir_sep) must denote a valid, existing directory, but the last * component need not exist. If die_on_error is set, then die with an * informative error message if there is a problem. Otherwise, return * NULL on errors (without generating any output). * * If path is our buffer, then return path, as it's already what the * user wants. */ static const char *real_path_internal(const char *path, int die_on_error) { static char bufs[2][PATH_MAX + 1], *buf = bufs[0], *next_buf = bufs[1]; char *retval = NULL; /* * If we have to temporarily chdir(), store the original CWD * here so that we can chdir() back to it at the end of the * function: */ char cwd[1024] = ""; int buf_index = 1; int depth = MAXDEPTH; char *last_elem = NULL; struct stat st; /* We've already done it */ if (path == buf || path == next_buf) return path; if (!*path) { if (die_on_error) die("The empty string is not a valid path"); else goto error_out; } if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX) { if (die_on_error) die("Too long path: %.*s", 60, path); else goto error_out; } while (depth--) { if (!is_directory(buf)) { char *last_slash = find_last_dir_sep(buf); if (last_slash) { last_elem = xstrdup(last_slash + 1); last_slash[1] = '\0'; } else { last_elem = xstrdup(buf); *buf = '\0'; } } if (*buf) { if (!*cwd && !getcwd(cwd, sizeof(cwd))) { if (die_on_error) die_errno("Could not get current working directory"); else goto error_out; } if (chdir(buf)) { if (die_on_error) die_errno("Could not switch to '%s'", buf); else goto error_out; } } if (!getcwd(buf, PATH_MAX)) { if (die_on_error) die_errno("Could not get current working directory"); else goto error_out; } if (last_elem) { size_t len = strlen(buf); if (len + strlen(last_elem) + 2 > PATH_MAX) { if (die_on_error) die("Too long path name: '%s/%s'", buf, last_elem); else goto error_out; } if (len && !is_dir_sep(buf[len - 1])) buf[len++] = '/'; strcpy(buf + len, last_elem); free(last_elem); last_elem = NULL; } if (!lstat(buf, &st) && S_ISLNK(st.st_mode)) { ssize_t len = readlink(buf, next_buf, PATH_MAX); if (len < 0) { if (die_on_error) die_errno("Invalid symlink '%s'", buf); else goto error_out; } if (PATH_MAX <= len) { if (die_on_error) die("symbolic link too long: %s", buf); else goto error_out; } next_buf[len] = '\0'; buf = next_buf; buf_index = 1 - buf_index; next_buf = bufs[buf_index]; } else break; } retval = buf; error_out: free(last_elem); if (*cwd && chdir(cwd)) die_errno("Could not change back to '%s'", cwd); return retval; } const char *real_path(const char *path) { return real_path_internal(path, 1); } const char *real_path_if_valid(const char *path) { return real_path_internal(path, 0); } static const char *get_pwd_cwd(void) { static char cwd[PATH_MAX + 1]; char *pwd; struct stat cwd_stat, pwd_stat; if (getcwd(cwd, PATH_MAX) == NULL) return NULL; pwd = getenv("PWD"); if (pwd && strcmp(pwd, cwd)) { stat(cwd, &cwd_stat); if ((cwd_stat.st_dev || cwd_stat.st_ino) && !stat(pwd, &pwd_stat) && pwd_stat.st_dev == cwd_stat.st_dev && pwd_stat.st_ino == cwd_stat.st_ino) { strlcpy(cwd, pwd, PATH_MAX); } } return cwd; } /* * Use this to get an absolute path from a relative one. If you want * to resolve links, you should use real_path. * * If the path is already absolute, then return path. As the user is * never meant to free the return value, we're safe. */ const char *absolute_path(const char *path) { static char buf[PATH_MAX + 1]; if (!*path) { die("The empty string is not a valid path"); } else if (is_absolute_path(path)) { if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX) die("Too long path: %.*s", 60, path); } else { size_t len; const char *fmt; const char *cwd = get_pwd_cwd(); if (!cwd) die_errno("Cannot determine the current working directory"); len = strlen(cwd); fmt = (len > 0 && is_dir_sep(cwd[len - 1])) ? "%s%s" : "%s/%s"; if (snprintf(buf, PATH_MAX, fmt, cwd, path) >= PATH_MAX) die("Too long path: %.*s", 60, path); } return buf; } /* * 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 struct strbuf path = STRBUF_INIT; #ifndef GIT_WINDOWS_NATIVE if (!pfx_len || is_absolute_path(arg)) return arg; strbuf_reset(&path); strbuf_add(&path, pfx, pfx_len); strbuf_addstr(&path, arg); #else char *p; /* don't add prefix to absolute paths, but still replace '\' by '/' */ strbuf_reset(&path); if (is_absolute_path(arg)) pfx_len = 0; else if (pfx_len) strbuf_add(&path, pfx, pfx_len); strbuf_addstr(&path, arg); for (p = path.buf + pfx_len; *p; p++) if (*p == '\\') *p = '/'; #endif return path.buf; }
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