| #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 struct strbuf sb = STRBUF_INIT; |
| 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: |
| */ |
| struct strbuf cwd = STRBUF_INIT; |
| |
| int depth = MAXDEPTH; |
| char *last_elem = NULL; |
| struct stat st; |
| |
| /* We've already done it */ |
| if (path == sb.buf) |
| return path; |
| |
| if (!*path) { |
| if (die_on_error) |
| die("The empty string is not a valid path"); |
| else |
| goto error_out; |
| } |
| |
| strbuf_reset(&sb); |
| strbuf_addstr(&sb, path); |
| |
| while (depth--) { |
| if (!is_directory(sb.buf)) { |
| char *last_slash = find_last_dir_sep(sb.buf); |
| if (last_slash) { |
| last_elem = xstrdup(last_slash + 1); |
| strbuf_setlen(&sb, last_slash - sb.buf + 1); |
| } else { |
| last_elem = xmemdupz(sb.buf, sb.len); |
| strbuf_reset(&sb); |
| } |
| } |
| |
| if (sb.len) { |
| if (!cwd.len && strbuf_getcwd(&cwd)) { |
| if (die_on_error) |
| die_errno("Could not get current working directory"); |
| else |
| goto error_out; |
| } |
| |
| if (chdir(sb.buf)) { |
| if (die_on_error) |
| die_errno("Could not switch to '%s'", |
| sb.buf); |
| else |
| goto error_out; |
| } |
| } |
| if (strbuf_getcwd(&sb)) { |
| if (die_on_error) |
| die_errno("Could not get current working directory"); |
| else |
| goto error_out; |
| } |
| |
| if (last_elem) { |
| if (sb.len && !is_dir_sep(sb.buf[sb.len - 1])) |
| strbuf_addch(&sb, '/'); |
| strbuf_addstr(&sb, last_elem); |
| free(last_elem); |
| last_elem = NULL; |
| } |
| |
| if (!lstat(sb.buf, &st) && S_ISLNK(st.st_mode)) { |
| struct strbuf next_sb = STRBUF_INIT; |
| ssize_t len = strbuf_readlink(&next_sb, sb.buf, 0); |
| if (len < 0) { |
| if (die_on_error) |
| die_errno("Invalid symlink '%s'", |
| sb.buf); |
| else |
| goto error_out; |
| } |
| strbuf_swap(&sb, &next_sb); |
| strbuf_release(&next_sb); |
| } else |
| break; |
| } |
| |
| retval = sb.buf; |
| error_out: |
| free(last_elem); |
| if (cwd.len && chdir(cwd.buf)) |
| die_errno("Could not change back to '%s'", cwd.buf); |
| strbuf_release(&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); |
| } |
| |
| /* |
| * Use this to get an absolute path from a relative one. If you want |
| * to resolve links, you should use real_path. |
| */ |
| const char *absolute_path(const char *path) |
| { |
| static struct strbuf sb = STRBUF_INIT; |
| strbuf_reset(&sb); |
| strbuf_add_absolute_path(&sb, path); |
| return sb.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 |
| /* 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); |
| convert_slashes(path.buf + pfx_len); |
| #endif |
| return path.buf; |
| } |