| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| |
| #include "bus-error.h" |
| #include "copy.h" |
| #include "fd-util.h" |
| #include "fileio.h" |
| #include "fs-util.h" |
| #include "mkdir.h" |
| #include "pager.h" |
| #include "path-util.h" |
| #include "pretty-print.h" |
| #include "process-util.h" |
| #include "selinux-util.h" |
| #include "stat-util.h" |
| #include "systemctl-daemon-reload.h" |
| #include "systemctl-edit.h" |
| #include "systemctl-util.h" |
| #include "systemctl.h" |
| #include "terminal-util.h" |
| #include "tmpfile-util.h" |
| |
| #define EDIT_MARKER_START "### Anything between here and the comment below will become the new contents of the file" |
| #define EDIT_MARKER_END "### Lines below this comment will be discarded" |
| |
| int cat(int argc, char *argv[], void *userdata) { |
| _cleanup_(hashmap_freep) Hashmap *cached_name_map = NULL, *cached_id_map = NULL; |
| _cleanup_(lookup_paths_free) LookupPaths lp = {}; |
| _cleanup_strv_free_ char **names = NULL; |
| char **name; |
| sd_bus *bus; |
| bool first = true; |
| int r, rc = 0; |
| |
| /* Include all units by default — i.e. continue as if the --all option was used */ |
| if (strv_isempty(arg_states)) |
| arg_all = true; |
| |
| if (arg_transport != BUS_TRANSPORT_LOCAL) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Cannot remotely cat units."); |
| |
| r = lookup_paths_init(&lp, arg_scope, 0, arg_root); |
| if (r < 0) |
| return log_error_errno(r, "Failed to determine unit paths: %m"); |
| |
| r = acquire_bus(BUS_MANAGER, &bus); |
| if (r < 0) |
| return r; |
| |
| r = expand_unit_names(bus, strv_skip(argv, 1), NULL, &names, NULL); |
| if (r < 0) |
| return log_error_errno(r, "Failed to expand names: %m"); |
| |
| r = maybe_extend_with_unit_dependencies(bus, &names); |
| if (r < 0) |
| return r; |
| |
| (void) pager_open(arg_pager_flags); |
| |
| STRV_FOREACH(name, names) { |
| _cleanup_free_ char *fragment_path = NULL; |
| _cleanup_strv_free_ char **dropin_paths = NULL; |
| |
| r = unit_find_paths(bus, *name, &lp, false, &cached_name_map, &cached_id_map, &fragment_path, &dropin_paths); |
| if (r == -ERFKILL) { |
| printf("%s# Unit %s is masked%s.\n", |
| ansi_highlight_magenta(), |
| *name, |
| ansi_normal()); |
| continue; |
| } |
| if (r == -EKEYREJECTED) { |
| printf("%s# Unit %s could not be loaded.%s\n", |
| ansi_highlight_magenta(), |
| *name, |
| ansi_normal()); |
| continue; |
| } |
| if (r < 0) |
| return r; |
| if (r == 0) { |
| /* Skip units which have no on-disk counterpart, but propagate the error to the |
| * user */ |
| rc = -ENOENT; |
| continue; |
| } |
| |
| if (first) |
| first = false; |
| else |
| puts(""); |
| |
| if (need_daemon_reload(bus, *name) > 0) /* ignore errors (<0), this is informational output */ |
| fprintf(stderr, |
| "%s# Warning: %s changed on disk, the version systemd has loaded is outdated.\n" |
| "%s# This output shows the current version of the unit's original fragment and drop-in files.\n" |
| "%s# If fragments or drop-ins were added or removed, they are not properly reflected in this output.\n" |
| "%s# Run 'systemctl%s daemon-reload' to reload units.%s\n", |
| ansi_highlight_red(), |
| *name, |
| ansi_highlight_red(), |
| ansi_highlight_red(), |
| ansi_highlight_red(), |
| arg_scope == UNIT_FILE_SYSTEM ? "" : " --user", |
| ansi_normal()); |
| |
| r = cat_files(fragment_path, dropin_paths, 0); |
| if (r < 0) |
| return r; |
| } |
| |
| return rc; |
| } |
| |
| static int create_edit_temp_file(const char *new_path, const char *original_path, char ** const original_unit_paths, char **ret_tmp_fn) { |
| _cleanup_free_ char *t = NULL; |
| int r; |
| |
| assert(new_path); |
| assert(ret_tmp_fn); |
| |
| r = tempfn_random(new_path, NULL, &t); |
| if (r < 0) |
| return log_error_errno(r, "Failed to determine temporary filename for \"%s\": %m", new_path); |
| |
| r = mkdir_parents_label(new_path, 0755); |
| if (r < 0) |
| return log_error_errno(r, "Failed to create directories for \"%s\": %m", new_path); |
| |
| if (original_path) { |
| r = mac_selinux_create_file_prepare(new_path, S_IFREG); |
| if (r < 0) |
| return r; |
| |
| r = copy_file(original_path, t, 0, 0644, 0, 0, COPY_REFLINK); |
| if (r == -ENOENT) { |
| r = touch(t); |
| mac_selinux_create_file_clear(); |
| if (r < 0) |
| return log_error_errno(r, "Failed to create temporary file \"%s\": %m", t); |
| } else { |
| mac_selinux_create_file_clear(); |
| if (r < 0) |
| return log_error_errno(r, "Failed to create temporary file for \"%s\": %m", new_path); |
| } |
| } else if (original_unit_paths) { |
| _cleanup_free_ char *new_contents = NULL; |
| _cleanup_fclose_ FILE *f = NULL; |
| char **path; |
| |
| r = mac_selinux_create_file_prepare(new_path, S_IFREG); |
| if (r < 0) |
| return r; |
| |
| f = fopen(t, "we"); |
| mac_selinux_create_file_clear(); |
| if (!f) |
| return log_error_errno(errno, "Failed to open \"%s\": %m", t); |
| |
| r = fchmod(fileno(f), 0644); |
| if (r < 0) |
| return log_error_errno(errno, "Failed to change mode of \"%s\": %m", t); |
| |
| r = read_full_file(new_path, &new_contents, NULL); |
| if (r < 0 && r != -ENOENT) |
| return log_error_errno(r, "Failed to read \"%s\": %m", new_path); |
| |
| fprintf(f, |
| "### Editing %s\n" |
| EDIT_MARKER_START |
| "\n\n%s%s\n" |
| EDIT_MARKER_END, |
| new_path, |
| strempty(new_contents), |
| new_contents && endswith(new_contents, "\n") ? "" : "\n"); |
| |
| /* Add a comment with the contents of the original unit files */ |
| STRV_FOREACH(path, original_unit_paths) { |
| _cleanup_free_ char *contents = NULL; |
| |
| /* Skip the file that's being edited */ |
| if (path_equal(*path, new_path)) |
| continue; |
| |
| r = read_full_file(*path, &contents, NULL); |
| if (r < 0) |
| return log_error_errno(r, "Failed to read \"%s\": %m", *path); |
| |
| fprintf(f, "\n\n### %s", *path); |
| if (!isempty(contents)) { |
| _cleanup_free_ char *commented_contents = NULL; |
| |
| commented_contents = strreplace(strstrip(contents), "\n", "\n# "); |
| if (!commented_contents) |
| return log_oom(); |
| fprintf(f, "\n# %s", commented_contents); |
| } |
| } |
| |
| r = fflush_and_check(f); |
| if (r < 0) |
| return log_error_errno(r, "Failed to create temporary file \"%s\": %m", t); |
| } |
| |
| *ret_tmp_fn = TAKE_PTR(t); |
| |
| return 0; |
| } |
| |
| static int get_file_to_edit( |
| const LookupPaths *paths, |
| const char *name, |
| char **ret_path) { |
| |
| _cleanup_free_ char *path = NULL, *run = NULL; |
| |
| assert(name); |
| assert(ret_path); |
| |
| path = path_join(paths->persistent_config, name); |
| if (!path) |
| return log_oom(); |
| |
| if (arg_runtime) { |
| run = path_join(paths->runtime_config, name); |
| if (!run) |
| return log_oom(); |
| } |
| |
| if (arg_runtime) { |
| if (access(path, F_OK) >= 0) |
| return log_error_errno(SYNTHETIC_ERRNO(EEXIST), |
| "Refusing to create \"%s\" because it would be overridden by \"%s\" anyway.", |
| run, path); |
| |
| *ret_path = TAKE_PTR(run); |
| } else |
| *ret_path = TAKE_PTR(path); |
| |
| return 0; |
| } |
| |
| static int unit_file_create_new( |
| const LookupPaths *paths, |
| const char *unit_name, |
| const char *suffix, |
| char ** const original_unit_paths, |
| char **ret_new_path, |
| char **ret_tmp_path) { |
| |
| _cleanup_free_ char *new_path = NULL, *tmp_path = NULL; |
| const char *ending; |
| int r; |
| |
| assert(unit_name); |
| assert(ret_new_path); |
| assert(ret_tmp_path); |
| |
| ending = strjoina(unit_name, suffix); |
| r = get_file_to_edit(paths, ending, &new_path); |
| if (r < 0) |
| return r; |
| |
| r = create_edit_temp_file(new_path, NULL, original_unit_paths, &tmp_path); |
| if (r < 0) |
| return r; |
| |
| *ret_new_path = TAKE_PTR(new_path); |
| *ret_tmp_path = TAKE_PTR(tmp_path); |
| |
| return 0; |
| } |
| |
| static int unit_file_create_copy( |
| const LookupPaths *paths, |
| const char *unit_name, |
| const char *fragment_path, |
| char **ret_new_path, |
| char **ret_tmp_path) { |
| |
| _cleanup_free_ char *new_path = NULL, *tmp_path = NULL; |
| int r; |
| |
| assert(fragment_path); |
| assert(unit_name); |
| assert(ret_new_path); |
| assert(ret_tmp_path); |
| |
| r = get_file_to_edit(paths, unit_name, &new_path); |
| if (r < 0) |
| return r; |
| |
| if (!path_equal(fragment_path, new_path) && access(new_path, F_OK) >= 0) { |
| char response; |
| |
| r = ask_char(&response, "yn", "\"%s\" already exists. Overwrite with \"%s\"? [(y)es, (n)o] ", new_path, fragment_path); |
| if (r < 0) |
| return r; |
| if (response != 'y') |
| return log_warning_errno(SYNTHETIC_ERRNO(EKEYREJECTED), "%s skipped.", unit_name); |
| } |
| |
| r = create_edit_temp_file(new_path, fragment_path, NULL, &tmp_path); |
| if (r < 0) |
| return r; |
| |
| *ret_new_path = TAKE_PTR(new_path); |
| *ret_tmp_path = TAKE_PTR(tmp_path); |
| |
| return 0; |
| } |
| |
| static int run_editor(char **paths) { |
| int r; |
| |
| assert(paths); |
| |
| r = safe_fork("(editor)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_RLIMIT_NOFILE_SAFE|FORK_LOG|FORK_WAIT, NULL); |
| if (r < 0) |
| return r; |
| if (r == 0) { |
| char **editor_args = NULL, **tmp_path, **original_path; |
| size_t n_editor_args = 0, i = 1, argc; |
| const char **args, *editor, *p; |
| |
| argc = strv_length(paths)/2 + 1; |
| |
| /* SYSTEMD_EDITOR takes precedence over EDITOR which takes precedence over VISUAL. If |
| * neither SYSTEMD_EDITOR nor EDITOR nor VISUAL are present, we try to execute well known |
| * editors. */ |
| editor = getenv("SYSTEMD_EDITOR"); |
| if (!editor) |
| editor = getenv("EDITOR"); |
| if (!editor) |
| editor = getenv("VISUAL"); |
| |
| if (!isempty(editor)) { |
| editor_args = strv_split(editor, WHITESPACE); |
| if (!editor_args) { |
| (void) log_oom(); |
| _exit(EXIT_FAILURE); |
| } |
| n_editor_args = strv_length(editor_args); |
| argc += n_editor_args - 1; |
| } |
| |
| args = newa(const char*, argc + 1); |
| |
| if (n_editor_args > 0) { |
| args[0] = editor_args[0]; |
| for (; i < n_editor_args; i++) |
| args[i] = editor_args[i]; |
| } |
| |
| STRV_FOREACH_PAIR(original_path, tmp_path, paths) |
| args[i++] = *tmp_path; |
| args[i] = NULL; |
| |
| if (n_editor_args > 0) |
| execvp(args[0], (char* const*) args); |
| |
| FOREACH_STRING(p, "editor", "nano", "vim", "vi") { |
| args[0] = p; |
| execvp(p, (char* const*) args); |
| /* We do not fail if the editor doesn't exist because we want to try each one of them |
| * before failing. */ |
| if (errno != ENOENT) { |
| log_error_errno(errno, "Failed to execute %s: %m", editor); |
| _exit(EXIT_FAILURE); |
| } |
| } |
| |
| log_error("Cannot edit unit(s), no editor available. Please set either $SYSTEMD_EDITOR, $EDITOR or $VISUAL."); |
| _exit(EXIT_FAILURE); |
| } |
| |
| return 0; |
| } |
| |
| static int find_paths_to_edit(sd_bus *bus, char **names, char ***paths) { |
| _cleanup_(hashmap_freep) Hashmap *cached_name_map = NULL, *cached_id_map = NULL; |
| _cleanup_(lookup_paths_free) LookupPaths lp = {}; |
| char **name; |
| int r; |
| |
| assert(names); |
| assert(paths); |
| |
| r = lookup_paths_init(&lp, arg_scope, 0, arg_root); |
| if (r < 0) |
| return r; |
| |
| STRV_FOREACH(name, names) { |
| _cleanup_free_ char *path = NULL, *new_path = NULL, *tmp_path = NULL, *tmp_name = NULL; |
| _cleanup_strv_free_ char **unit_paths = NULL; |
| const char *unit_name; |
| |
| r = unit_find_paths(bus, *name, &lp, false, &cached_name_map, &cached_id_map, &path, &unit_paths); |
| if (r == -EKEYREJECTED) { |
| /* If loading of the unit failed server side complete, then the server won't tell us |
| * the unit file path. In that case, find the file client side. */ |
| log_debug_errno(r, "Unit '%s' was not loaded correctly, retrying client-side.", *name); |
| r = unit_find_paths(bus, *name, &lp, true, &cached_name_map, &cached_id_map, &path, &unit_paths); |
| } |
| if (r == -ERFKILL) |
| return log_error_errno(r, "Unit '%s' masked, cannot edit.", *name); |
| if (r < 0) |
| return r; |
| |
| if (!path) { |
| if (!arg_force) { |
| log_info("Run 'systemctl edit%s --force --full %s' to create a new unit.", |
| arg_scope == UNIT_FILE_GLOBAL ? " --global" : |
| arg_scope == UNIT_FILE_USER ? " --user" : "", |
| *name); |
| return -ENOENT; |
| } |
| |
| /* Create a new unit from scratch */ |
| unit_name = *name; |
| r = unit_file_create_new(&lp, unit_name, |
| arg_full ? NULL : ".d/override.conf", |
| NULL, &new_path, &tmp_path); |
| } else { |
| unit_name = basename(path); |
| /* We follow unit aliases, but we need to propagate the instance */ |
| if (unit_name_is_valid(*name, UNIT_NAME_INSTANCE) && |
| unit_name_is_valid(unit_name, UNIT_NAME_TEMPLATE)) { |
| _cleanup_free_ char *instance = NULL; |
| |
| r = unit_name_to_instance(*name, &instance); |
| if (r < 0) |
| return r; |
| |
| r = unit_name_replace_instance(unit_name, instance, &tmp_name); |
| if (r < 0) |
| return r; |
| |
| unit_name = tmp_name; |
| } |
| |
| if (arg_full) |
| r = unit_file_create_copy(&lp, unit_name, path, &new_path, &tmp_path); |
| else { |
| r = strv_prepend(&unit_paths, path); |
| if (r < 0) |
| return log_oom(); |
| |
| r = unit_file_create_new(&lp, unit_name, ".d/override.conf", unit_paths, &new_path, &tmp_path); |
| } |
| } |
| if (r < 0) |
| return r; |
| |
| r = strv_push_pair(paths, new_path, tmp_path); |
| if (r < 0) |
| return log_oom(); |
| |
| new_path = tmp_path = NULL; |
| } |
| |
| return 0; |
| } |
| |
| static int trim_edit_markers(const char *path) { |
| _cleanup_free_ char *contents = NULL; |
| char *contents_start = NULL; |
| const char *contents_end = NULL; |
| size_t size; |
| int r; |
| |
| /* Trim out the lines between the two markers */ |
| r = read_full_file(path, &contents, NULL); |
| if (r < 0) |
| return log_error_errno(r, "Failed to read temporary file \"%s\": %m", path); |
| |
| size = strlen(contents); |
| |
| contents_start = strstr(contents, EDIT_MARKER_START); |
| if (contents_start) |
| contents_start += strlen(EDIT_MARKER_START); |
| else |
| contents_start = contents; |
| |
| contents_end = strstr(contents_start, EDIT_MARKER_END); |
| if (contents_end) |
| strshorten(contents_start, contents_end - contents_start); |
| |
| contents_start = strstrip(contents_start); |
| |
| /* Write new contents if the trimming actually changed anything */ |
| if (strlen(contents) != size) { |
| r = write_string_file(path, contents_start, WRITE_STRING_FILE_CREATE | WRITE_STRING_FILE_TRUNCATE | WRITE_STRING_FILE_AVOID_NEWLINE); |
| if (r < 0) |
| return log_error_errno(r, "Failed to modify temporary file \"%s\": %m", path); |
| } |
| |
| return 0; |
| } |
| |
| int edit(int argc, char *argv[], void *userdata) { |
| _cleanup_(lookup_paths_free) LookupPaths lp = {}; |
| _cleanup_strv_free_ char **names = NULL; |
| _cleanup_strv_free_ char **paths = NULL; |
| char **original, **tmp; |
| sd_bus *bus; |
| int r; |
| |
| if (!on_tty()) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Cannot edit units if not on a tty."); |
| |
| if (arg_transport != BUS_TRANSPORT_LOCAL) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Cannot edit units remotely."); |
| |
| r = lookup_paths_init(&lp, arg_scope, 0, arg_root); |
| if (r < 0) |
| return log_error_errno(r, "Failed to determine unit paths: %m"); |
| |
| r = mac_selinux_init(); |
| if (r < 0) |
| return r; |
| |
| r = acquire_bus(BUS_MANAGER, &bus); |
| if (r < 0) |
| return r; |
| |
| r = expand_unit_names(bus, strv_skip(argv, 1), NULL, &names, NULL); |
| if (r < 0) |
| return log_error_errno(r, "Failed to expand names: %m"); |
| if (strv_isempty(names)) |
| return log_error_errno(SYNTHETIC_ERRNO(ENOENT), "No units matched the specified patterns."); |
| |
| STRV_FOREACH(tmp, names) { |
| r = unit_is_masked(bus, &lp, *tmp); |
| if (r < 0) |
| return r; |
| if (r > 0) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Cannot edit %s: unit is masked.", *tmp); |
| } |
| |
| r = find_paths_to_edit(bus, names, &paths); |
| if (r < 0) |
| return r; |
| |
| if (strv_isempty(paths)) |
| return -ENOENT; |
| |
| r = run_editor(paths); |
| if (r < 0) |
| goto end; |
| |
| STRV_FOREACH_PAIR(original, tmp, paths) { |
| /* If the temporary file is empty we ignore it. This allows the user to cancel the |
| * modification. */ |
| r = trim_edit_markers(*tmp); |
| if (r < 0) |
| continue; |
| |
| if (null_or_empty_path(*tmp)) { |
| log_warning("Editing \"%s\" canceled: temporary file is empty.", *original); |
| continue; |
| } |
| |
| r = rename(*tmp, *original); |
| if (r < 0) { |
| r = log_error_errno(errno, "Failed to rename \"%s\" to \"%s\": %m", *tmp, *original); |
| goto end; |
| } |
| } |
| |
| r = 0; |
| |
| if (!arg_no_reload && !install_client_side()) |
| r = daemon_reload(argc, argv, userdata); |
| |
| end: |
| STRV_FOREACH_PAIR(original, tmp, paths) { |
| (void) unlink(*tmp); |
| |
| /* Removing empty dropin dirs */ |
| if (!arg_full) { |
| _cleanup_free_ char *dir = NULL; |
| |
| dir = dirname_malloc(*original); |
| if (!dir) |
| return log_oom(); |
| |
| /* No need to check if the dir is empty, rmdir does nothing if it is not the case. */ |
| (void) rmdir(dir); |
| } |
| } |
| |
| return r; |
| } |
