0c69794138
These lines are generally out-of-date, incomplete and unnecessary. With SPDX and git repository much more accurate and fine grained information about licensing and authorship is available, hence let's drop the per-file copyright notice. Of course, removing copyright lines of others is problematic, hence this commit only removes my own lines and leaves all others untouched. It might be nicer if sooner or later those could go away too, making git the only and accurate source of authorship information.
786 lines
21 KiB
C
786 lines
21 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <errno.h>
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#include <sys/epoll.h>
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#include <sys/inotify.h>
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#include <unistd.h>
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#include "bus-error.h"
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#include "bus-util.h"
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#include "dbus-path.h"
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#include "fd-util.h"
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#include "fs-util.h"
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#include "glob-util.h"
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#include "macro.h"
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#include "mkdir.h"
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#include "path.h"
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#include "special.h"
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#include "stat-util.h"
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#include "string-table.h"
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#include "string-util.h"
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#include "unit-name.h"
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#include "unit.h"
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static const UnitActiveState state_translation_table[_PATH_STATE_MAX] = {
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[PATH_DEAD] = UNIT_INACTIVE,
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[PATH_WAITING] = UNIT_ACTIVE,
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[PATH_RUNNING] = UNIT_ACTIVE,
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[PATH_FAILED] = UNIT_FAILED
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};
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static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
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int path_spec_watch(PathSpec *s, sd_event_io_handler_t handler) {
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static const int flags_table[_PATH_TYPE_MAX] = {
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[PATH_EXISTS] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB,
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[PATH_EXISTS_GLOB] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB,
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[PATH_CHANGED] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CLOSE_WRITE|IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO,
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[PATH_MODIFIED] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CLOSE_WRITE|IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO|IN_MODIFY,
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[PATH_DIRECTORY_NOT_EMPTY] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CREATE|IN_MOVED_TO
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};
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bool exists = false;
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char *slash, *oldslash = NULL;
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int r;
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assert(s);
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assert(s->unit);
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assert(handler);
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path_spec_unwatch(s);
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s->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
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if (s->inotify_fd < 0) {
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r = -errno;
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goto fail;
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}
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r = sd_event_add_io(s->unit->manager->event, &s->event_source, s->inotify_fd, EPOLLIN, handler, s);
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if (r < 0)
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goto fail;
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(void) sd_event_source_set_description(s->event_source, "path");
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/* This function assumes the path was passed through path_simplify()! */
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assert(!strstr(s->path, "//"));
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for (slash = strchr(s->path, '/'); ; slash = strchr(slash+1, '/')) {
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char *cut = NULL;
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int flags;
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char tmp;
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if (slash) {
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cut = slash + (slash == s->path);
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tmp = *cut;
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*cut = '\0';
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flags = IN_MOVE_SELF | IN_DELETE_SELF | IN_ATTRIB | IN_CREATE | IN_MOVED_TO;
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} else
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flags = flags_table[s->type];
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r = inotify_add_watch(s->inotify_fd, s->path, flags);
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if (r < 0) {
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if (IN_SET(errno, EACCES, ENOENT)) {
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if (cut)
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*cut = tmp;
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break;
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}
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r = log_warning_errno(errno, "Failed to add watch on %s: %s", s->path, errno == ENOSPC ? "too many watches" : strerror(-r));
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if (cut)
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*cut = tmp;
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goto fail;
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} else {
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exists = true;
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/* Path exists, we don't need to watch parent too closely. */
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if (oldslash) {
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char *cut2 = oldslash + (oldslash == s->path);
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char tmp2 = *cut2;
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*cut2 = '\0';
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(void) inotify_add_watch(s->inotify_fd, s->path, IN_MOVE_SELF);
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/* Error is ignored, the worst can happen is we get spurious events. */
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*cut2 = tmp2;
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}
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}
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if (cut)
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*cut = tmp;
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if (slash)
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oldslash = slash;
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else {
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/* whole path has been iterated over */
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s->primary_wd = r;
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break;
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}
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}
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if (!exists) {
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r = log_error_errno(errno, "Failed to add watch on any of the components of %s: %m", s->path);
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/* either EACCESS or ENOENT */
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goto fail;
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}
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return 0;
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fail:
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path_spec_unwatch(s);
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return r;
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}
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void path_spec_unwatch(PathSpec *s) {
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assert(s);
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s->event_source = sd_event_source_unref(s->event_source);
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s->inotify_fd = safe_close(s->inotify_fd);
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}
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int path_spec_fd_event(PathSpec *s, uint32_t revents) {
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union inotify_event_buffer buffer;
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struct inotify_event *e;
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ssize_t l;
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int r = 0;
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if (revents != EPOLLIN) {
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log_error("Got invalid poll event on inotify.");
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return -EINVAL;
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}
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l = read(s->inotify_fd, &buffer, sizeof(buffer));
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if (l < 0) {
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if (IN_SET(errno, EAGAIN, EINTR))
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return 0;
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return log_error_errno(errno, "Failed to read inotify event: %m");
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}
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FOREACH_INOTIFY_EVENT(e, buffer, l) {
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if (IN_SET(s->type, PATH_CHANGED, PATH_MODIFIED) &&
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s->primary_wd == e->wd)
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r = 1;
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}
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return r;
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}
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static bool path_spec_check_good(PathSpec *s, bool initial) {
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bool good = false;
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switch (s->type) {
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case PATH_EXISTS:
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good = access(s->path, F_OK) >= 0;
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break;
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case PATH_EXISTS_GLOB:
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good = glob_exists(s->path) > 0;
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break;
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case PATH_DIRECTORY_NOT_EMPTY: {
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int k;
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k = dir_is_empty(s->path);
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good = !(k == -ENOENT || k > 0);
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break;
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}
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case PATH_CHANGED:
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case PATH_MODIFIED: {
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bool b;
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b = access(s->path, F_OK) >= 0;
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good = !initial && b != s->previous_exists;
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s->previous_exists = b;
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break;
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}
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default:
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;
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}
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return good;
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}
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static void path_spec_mkdir(PathSpec *s, mode_t mode) {
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int r;
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if (IN_SET(s->type, PATH_EXISTS, PATH_EXISTS_GLOB))
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return;
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r = mkdir_p_label(s->path, mode);
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if (r < 0)
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log_warning_errno(r, "mkdir(%s) failed: %m", s->path);
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}
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static void path_spec_dump(PathSpec *s, FILE *f, const char *prefix) {
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fprintf(f,
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"%s%s: %s\n",
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prefix,
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path_type_to_string(s->type),
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s->path);
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}
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void path_spec_done(PathSpec *s) {
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assert(s);
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assert(s->inotify_fd == -1);
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free(s->path);
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}
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static void path_init(Unit *u) {
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Path *p = PATH(u);
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assert(u);
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assert(u->load_state == UNIT_STUB);
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p->directory_mode = 0755;
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}
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void path_free_specs(Path *p) {
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PathSpec *s;
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assert(p);
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while ((s = p->specs)) {
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path_spec_unwatch(s);
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LIST_REMOVE(spec, p->specs, s);
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path_spec_done(s);
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free(s);
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}
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}
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static void path_done(Unit *u) {
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Path *p = PATH(u);
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assert(p);
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path_free_specs(p);
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}
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static int path_add_mount_dependencies(Path *p) {
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PathSpec *s;
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int r;
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assert(p);
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LIST_FOREACH(spec, s, p->specs) {
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r = unit_require_mounts_for(UNIT(p), s->path, UNIT_DEPENDENCY_FILE);
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if (r < 0)
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return r;
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}
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return 0;
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}
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static int path_verify(Path *p) {
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assert(p);
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if (UNIT(p)->load_state != UNIT_LOADED)
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return 0;
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if (!p->specs) {
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log_unit_error(UNIT(p), "Path unit lacks path setting. Refusing.");
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return -ENOEXEC;
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}
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return 0;
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}
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static int path_add_default_dependencies(Path *p) {
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int r;
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assert(p);
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if (!UNIT(p)->default_dependencies)
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return 0;
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r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE, SPECIAL_PATHS_TARGET, NULL, true, UNIT_DEPENDENCY_DEFAULT);
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if (r < 0)
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return r;
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if (MANAGER_IS_SYSTEM(UNIT(p)->manager)) {
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r = unit_add_two_dependencies_by_name(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true, UNIT_DEPENDENCY_DEFAULT);
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if (r < 0)
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return r;
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}
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return unit_add_two_dependencies_by_name(UNIT(p), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true, UNIT_DEPENDENCY_DEFAULT);
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}
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static int path_add_trigger_dependencies(Path *p) {
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Unit *x;
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int r;
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assert(p);
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if (!hashmap_isempty(UNIT(p)->dependencies[UNIT_TRIGGERS]))
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return 0;
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r = unit_load_related_unit(UNIT(p), ".service", &x);
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if (r < 0)
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return r;
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return unit_add_two_dependencies(UNIT(p), UNIT_BEFORE, UNIT_TRIGGERS, x, true, UNIT_DEPENDENCY_IMPLICIT);
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}
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static int path_load(Unit *u) {
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Path *p = PATH(u);
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int r;
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assert(u);
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assert(u->load_state == UNIT_STUB);
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r = unit_load_fragment_and_dropin(u);
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if (r < 0)
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return r;
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if (u->load_state == UNIT_LOADED) {
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r = path_add_trigger_dependencies(p);
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if (r < 0)
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return r;
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r = path_add_mount_dependencies(p);
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if (r < 0)
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return r;
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r = path_add_default_dependencies(p);
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if (r < 0)
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return r;
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}
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return path_verify(p);
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}
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static void path_dump(Unit *u, FILE *f, const char *prefix) {
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Path *p = PATH(u);
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Unit *trigger;
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PathSpec *s;
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assert(p);
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assert(f);
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trigger = UNIT_TRIGGER(u);
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fprintf(f,
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"%sPath State: %s\n"
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"%sResult: %s\n"
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"%sUnit: %s\n"
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"%sMakeDirectory: %s\n"
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"%sDirectoryMode: %04o\n",
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prefix, path_state_to_string(p->state),
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prefix, path_result_to_string(p->result),
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prefix, trigger ? trigger->id : "n/a",
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prefix, yes_no(p->make_directory),
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prefix, p->directory_mode);
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LIST_FOREACH(spec, s, p->specs)
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path_spec_dump(s, f, prefix);
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}
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static void path_unwatch(Path *p) {
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PathSpec *s;
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assert(p);
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LIST_FOREACH(spec, s, p->specs)
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path_spec_unwatch(s);
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}
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static int path_watch(Path *p) {
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int r;
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PathSpec *s;
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assert(p);
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LIST_FOREACH(spec, s, p->specs) {
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r = path_spec_watch(s, path_dispatch_io);
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if (r < 0)
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return r;
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}
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return 0;
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}
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static void path_set_state(Path *p, PathState state) {
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PathState old_state;
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assert(p);
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old_state = p->state;
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p->state = state;
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if (state != PATH_WAITING &&
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(state != PATH_RUNNING || p->inotify_triggered))
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path_unwatch(p);
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if (state != old_state)
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log_unit_debug(UNIT(p), "Changed %s -> %s", path_state_to_string(old_state), path_state_to_string(state));
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unit_notify(UNIT(p), state_translation_table[old_state], state_translation_table[state], 0);
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}
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static void path_enter_waiting(Path *p, bool initial, bool recheck);
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static int path_coldplug(Unit *u) {
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Path *p = PATH(u);
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assert(p);
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assert(p->state == PATH_DEAD);
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if (p->deserialized_state != p->state) {
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if (IN_SET(p->deserialized_state, PATH_WAITING, PATH_RUNNING))
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path_enter_waiting(p, true, true);
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else
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path_set_state(p, p->deserialized_state);
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}
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return 0;
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}
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static void path_enter_dead(Path *p, PathResult f) {
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assert(p);
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if (p->result == PATH_SUCCESS)
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p->result = f;
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if (p->result != PATH_SUCCESS)
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log_unit_warning(UNIT(p), "Failed with result '%s'.", path_result_to_string(p->result));
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path_set_state(p, p->result != PATH_SUCCESS ? PATH_FAILED : PATH_DEAD);
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}
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static void path_enter_running(Path *p) {
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_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
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Unit *trigger;
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int r;
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assert(p);
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/* Don't start job if we are supposed to go down */
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if (unit_stop_pending(UNIT(p)))
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return;
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trigger = UNIT_TRIGGER(UNIT(p));
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if (!trigger) {
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log_unit_error(UNIT(p), "Unit to trigger vanished.");
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path_enter_dead(p, PATH_FAILURE_RESOURCES);
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return;
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}
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r = manager_add_job(UNIT(p)->manager, JOB_START, trigger, JOB_REPLACE, &error, NULL);
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if (r < 0)
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goto fail;
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p->inotify_triggered = false;
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r = path_watch(p);
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if (r < 0)
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goto fail;
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path_set_state(p, PATH_RUNNING);
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return;
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fail:
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log_unit_warning(UNIT(p), "Failed to queue unit startup job: %s", bus_error_message(&error, r));
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path_enter_dead(p, PATH_FAILURE_RESOURCES);
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}
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static bool path_check_good(Path *p, bool initial) {
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PathSpec *s;
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bool good = false;
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assert(p);
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LIST_FOREACH(spec, s, p->specs) {
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good = path_spec_check_good(s, initial);
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if (good)
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break;
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}
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return good;
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}
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static void path_enter_waiting(Path *p, bool initial, bool recheck) {
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int r;
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if (recheck)
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if (path_check_good(p, initial)) {
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log_unit_debug(UNIT(p), "Got triggered.");
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path_enter_running(p);
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return;
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}
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r = path_watch(p);
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if (r < 0)
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goto fail;
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/* Hmm, so now we have created inotify watches, but the file
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* might have appeared/been removed by now, so we must
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* recheck */
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if (recheck)
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if (path_check_good(p, false)) {
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log_unit_debug(UNIT(p), "Got triggered.");
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path_enter_running(p);
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return;
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}
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path_set_state(p, PATH_WAITING);
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return;
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fail:
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log_unit_warning_errno(UNIT(p), r, "Failed to enter waiting state: %m");
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path_enter_dead(p, PATH_FAILURE_RESOURCES);
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}
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static void path_mkdir(Path *p) {
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PathSpec *s;
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assert(p);
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if (!p->make_directory)
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return;
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LIST_FOREACH(spec, s, p->specs)
|
|
path_spec_mkdir(s, p->directory_mode);
|
|
}
|
|
|
|
static int path_start(Unit *u) {
|
|
Path *p = PATH(u);
|
|
Unit *trigger;
|
|
int r;
|
|
|
|
assert(p);
|
|
assert(IN_SET(p->state, PATH_DEAD, PATH_FAILED));
|
|
|
|
trigger = UNIT_TRIGGER(u);
|
|
if (!trigger || trigger->load_state != UNIT_LOADED) {
|
|
log_unit_error(u, "Refusing to start, unit to trigger not loaded.");
|
|
return -ENOENT;
|
|
}
|
|
|
|
r = unit_start_limit_test(u);
|
|
if (r < 0) {
|
|
path_enter_dead(p, PATH_FAILURE_START_LIMIT_HIT);
|
|
return r;
|
|
}
|
|
|
|
r = unit_acquire_invocation_id(u);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
path_mkdir(p);
|
|
|
|
p->result = PATH_SUCCESS;
|
|
path_enter_waiting(p, true, true);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int path_stop(Unit *u) {
|
|
Path *p = PATH(u);
|
|
|
|
assert(p);
|
|
assert(IN_SET(p->state, PATH_WAITING, PATH_RUNNING));
|
|
|
|
path_enter_dead(p, PATH_SUCCESS);
|
|
return 1;
|
|
}
|
|
|
|
static int path_serialize(Unit *u, FILE *f, FDSet *fds) {
|
|
Path *p = PATH(u);
|
|
|
|
assert(u);
|
|
assert(f);
|
|
assert(fds);
|
|
|
|
unit_serialize_item(u, f, "state", path_state_to_string(p->state));
|
|
unit_serialize_item(u, f, "result", path_result_to_string(p->result));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int path_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
|
|
Path *p = PATH(u);
|
|
|
|
assert(u);
|
|
assert(key);
|
|
assert(value);
|
|
assert(fds);
|
|
|
|
if (streq(key, "state")) {
|
|
PathState state;
|
|
|
|
state = path_state_from_string(value);
|
|
if (state < 0)
|
|
log_unit_debug(u, "Failed to parse state value: %s", value);
|
|
else
|
|
p->deserialized_state = state;
|
|
|
|
} else if (streq(key, "result")) {
|
|
PathResult f;
|
|
|
|
f = path_result_from_string(value);
|
|
if (f < 0)
|
|
log_unit_debug(u, "Failed to parse result value: %s", value);
|
|
else if (f != PATH_SUCCESS)
|
|
p->result = f;
|
|
|
|
} else
|
|
log_unit_debug(u, "Unknown serialization key: %s", key);
|
|
|
|
return 0;
|
|
}
|
|
|
|
_pure_ static UnitActiveState path_active_state(Unit *u) {
|
|
assert(u);
|
|
|
|
return state_translation_table[PATH(u)->state];
|
|
}
|
|
|
|
_pure_ static const char *path_sub_state_to_string(Unit *u) {
|
|
assert(u);
|
|
|
|
return path_state_to_string(PATH(u)->state);
|
|
}
|
|
|
|
static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
|
|
PathSpec *s = userdata;
|
|
Path *p;
|
|
int changed;
|
|
|
|
assert(s);
|
|
assert(s->unit);
|
|
assert(fd >= 0);
|
|
|
|
p = PATH(s->unit);
|
|
|
|
if (!IN_SET(p->state, PATH_WAITING, PATH_RUNNING))
|
|
return 0;
|
|
|
|
/* log_debug("inotify wakeup on %s.", u->id); */
|
|
|
|
LIST_FOREACH(spec, s, p->specs)
|
|
if (path_spec_owns_inotify_fd(s, fd))
|
|
break;
|
|
|
|
if (!s) {
|
|
log_error("Got event on unknown fd.");
|
|
goto fail;
|
|
}
|
|
|
|
changed = path_spec_fd_event(s, revents);
|
|
if (changed < 0)
|
|
goto fail;
|
|
|
|
/* If we are already running, then remember that one event was
|
|
* dispatched so that we restart the service only if something
|
|
* actually changed on disk */
|
|
p->inotify_triggered = true;
|
|
|
|
if (changed)
|
|
path_enter_running(p);
|
|
else
|
|
path_enter_waiting(p, false, true);
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
path_enter_dead(p, PATH_FAILURE_RESOURCES);
|
|
return 0;
|
|
}
|
|
|
|
static void path_trigger_notify(Unit *u, Unit *other) {
|
|
Path *p = PATH(u);
|
|
|
|
assert(u);
|
|
assert(other);
|
|
|
|
/* Invoked whenever the unit we trigger changes state or gains
|
|
* or loses a job */
|
|
|
|
if (other->load_state != UNIT_LOADED)
|
|
return;
|
|
|
|
if (p->state == PATH_RUNNING &&
|
|
UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other))) {
|
|
log_unit_debug(UNIT(p), "Got notified about unit deactivation.");
|
|
|
|
/* Hmm, so inotify was triggered since the
|
|
* last activation, so I guess we need to
|
|
* recheck what is going on. */
|
|
path_enter_waiting(p, false, p->inotify_triggered);
|
|
}
|
|
}
|
|
|
|
static void path_reset_failed(Unit *u) {
|
|
Path *p = PATH(u);
|
|
|
|
assert(p);
|
|
|
|
if (p->state == PATH_FAILED)
|
|
path_set_state(p, PATH_DEAD);
|
|
|
|
p->result = PATH_SUCCESS;
|
|
}
|
|
|
|
static const char* const path_type_table[_PATH_TYPE_MAX] = {
|
|
[PATH_EXISTS] = "PathExists",
|
|
[PATH_EXISTS_GLOB] = "PathExistsGlob",
|
|
[PATH_DIRECTORY_NOT_EMPTY] = "DirectoryNotEmpty",
|
|
[PATH_CHANGED] = "PathChanged",
|
|
[PATH_MODIFIED] = "PathModified",
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(path_type, PathType);
|
|
|
|
static const char* const path_result_table[_PATH_RESULT_MAX] = {
|
|
[PATH_SUCCESS] = "success",
|
|
[PATH_FAILURE_RESOURCES] = "resources",
|
|
[PATH_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(path_result, PathResult);
|
|
|
|
const UnitVTable path_vtable = {
|
|
.object_size = sizeof(Path),
|
|
|
|
.sections =
|
|
"Unit\0"
|
|
"Path\0"
|
|
"Install\0",
|
|
.private_section = "Path",
|
|
|
|
.can_transient = true,
|
|
|
|
.init = path_init,
|
|
.done = path_done,
|
|
.load = path_load,
|
|
|
|
.coldplug = path_coldplug,
|
|
|
|
.dump = path_dump,
|
|
|
|
.start = path_start,
|
|
.stop = path_stop,
|
|
|
|
.serialize = path_serialize,
|
|
.deserialize_item = path_deserialize_item,
|
|
|
|
.active_state = path_active_state,
|
|
.sub_state_to_string = path_sub_state_to_string,
|
|
|
|
.trigger_notify = path_trigger_notify,
|
|
|
|
.reset_failed = path_reset_failed,
|
|
|
|
.bus_vtable = bus_path_vtable,
|
|
.bus_set_property = bus_path_set_property,
|
|
};
|