shared/install: when unit contains only Also=, report 'indirect'

If a unit contains only Also=, with no Alias= or WantedBy=, it shouldn't
be reported as static. New 'indirect' status shall be introduced.

https://bugzilla.redhat.com/show_bug.cgi?id=864298

4 files changed, 41 insertions, 18 deletions

diff --git a/man/systemctl.xml b/man/systemctl.xml
index b1d60ebf32..8e681856cb 100644
--- a/man/systemctl.xml
+++ b/man/systemctl.xml
@@ -1019,6 +1019,11 @@ kobject-uevent 1 systemd-udevd-kernel.socket systemd-udevd.service
                     <entry>0</entry>
                   </row>
                   <row>
+                    <entry><literal>indirect</literal></entry>
+                    <entry>Unit's status is determined indirectly by another unit(s) specified in <literal>Also=</literal> in [Install] section</entry>
+                    <entry>0</entry>
+                  </row>
+                  <row>
                     <entry><literal>disabled</literal></entry>
                     <entry>Unit is not enabled</entry>
                     <entry>1</entry>
diff --git a/src/shared/install.c b/src/shared/install.c
index cab93e8dc6..8a7f7e2094 100644
--- a/src/shared/install.c
+++ b/src/shared/install.c
@@ -840,6 +840,7 @@ static void install_info_free(InstallInfo *i) {
         strv_free(i->aliases);
         strv_free(i->wanted_by);
         strv_free(i->required_by);
+        strv_free(i->also);
         free(i->default_instance);
         free(i);
 }
@@ -948,6 +949,7 @@ static int config_parse_also(
         size_t l;
         const char *word, *state;
         InstallContext *c = data;
+        InstallInfo *i = userdata;
 
         assert(filename);
         assert(lvalue);
@@ -964,6 +966,10 @@ static int config_parse_also(
                 r = install_info_add(c, n, NULL);
                 if (r < 0)
                         return r;
+
+                r = strv_extend(&i->also, n);
+                if (r < 0)
+                        return r;
         }
         if (!isempty(state))
                 log_syntax(unit, LOG_ERR, filename, line, EINVAL,
@@ -1043,7 +1049,8 @@ static int unit_file_load(
                 const char *path,
                 const char *root_dir,
                 bool allow_symlink,
-                bool load) {
+                bool load,
+                bool *also) {
 
         const ConfigTableItem items[] = {
                 { "Install", "Alias",           config_parse_strv,             0, &info->aliases           },
@@ -1087,6 +1094,9 @@ static int unit_file_load(
         if (r < 0)
                 return r;
 
+        if (also)
+                *also = !strv_isempty(info->also);
+
         return
                 (int) strv_length(info->aliases) +
                 (int) strv_length(info->wanted_by) +
@@ -1099,7 +1109,8 @@ static int unit_file_search(
                 LookupPaths *paths,
                 const char *root_dir,
                 bool allow_symlink,
-                bool load) {
+                bool load,
+                bool *also) {
 
         char **p;
         int r;
@@ -1109,7 +1120,7 @@ static int unit_file_search(
         assert(paths);
 
         if (info->path)
-                return unit_file_load(c, info, info->path, root_dir, allow_symlink, load);
+                return unit_file_load(c, info, info->path, root_dir, allow_symlink, load, also);
 
         assert(info->name);
 
@@ -1120,7 +1131,7 @@ static int unit_file_search(
                 if (!path)
                         return -ENOMEM;
 
-                r = unit_file_load(c, info, path, root_dir, allow_symlink, load);
+                r = unit_file_load(c, info, path, root_dir, allow_symlink, load, also);
                 if (r >= 0) {
                         info->path = path;
                         path = NULL;
@@ -1149,7 +1160,7 @@ static int unit_file_search(
                         if (!path)
                                 return -ENOMEM;
 
-                        r = unit_file_load(c, info, path, root_dir, allow_symlink, load);
+                        r = unit_file_load(c, info, path, root_dir, allow_symlink, load, also);
                         if (r >= 0) {
                                 info->path = path;
                                 path = NULL;
@@ -1167,7 +1178,8 @@ static int unit_file_can_install(
                 LookupPaths *paths,
                 const char *root_dir,
                 const char *name,
-                bool allow_symlink) {
+                bool allow_symlink,
+                bool *also) {
 
         _cleanup_(install_context_done) InstallContext c = {};
         InstallInfo *i;
@@ -1182,7 +1194,7 @@ static int unit_file_can_install(
 
         assert_se(i = ordered_hashmap_first(c.will_install));
 
-        r = unit_file_search(&c, i, paths, root_dir, allow_symlink, true);
+        r = unit_file_search(&c, i, paths, root_dir, allow_symlink, true, also);
 
         if (r >= 0)
                 r =
@@ -1415,7 +1427,7 @@ static int install_context_apply(
         while ((i = ordered_hashmap_first(c->will_install))) {
                 assert_se(ordered_hashmap_move_one(c->have_installed, c->will_install, i->name) == 0);
 
-                q = unit_file_search(c, i, paths, root_dir, false, true);
+                q = unit_file_search(c, i, paths, root_dir, false, true, NULL);
                 if (q < 0) {
                         if (r >= 0)
                                 r = q;
@@ -1462,7 +1474,7 @@ static int install_context_mark_for_removal(
         while ((i = ordered_hashmap_first(c->will_install))) {
                 assert_se(ordered_hashmap_move_one(c->have_installed, c->will_install, i->name) == 0);
 
-                q = unit_file_search(c, i, paths, root_dir, false, true);
+                q = unit_file_search(c, i, paths, root_dir, false, true, NULL);
                 if (q == -ENOENT) {
                         /* do nothing */
                 } else if (q < 0) {
@@ -1569,7 +1581,7 @@ int unit_file_add_dependency(
         while ((info = ordered_hashmap_first(c.will_install))) {
                 assert_se(ordered_hashmap_move_one(c.have_installed, c.will_install, info->name) == 0);
 
-                r = unit_file_search(&c, info, &paths, root_dir, false, false);
+                r = unit_file_search(&c, info, &paths, root_dir, false, false, NULL);
                 if (r < 0)
                         return r;
 
@@ -1738,7 +1750,7 @@ int unit_file_set_default(
 
         assert_se(i = ordered_hashmap_first(c.will_install));
 
-        r = unit_file_search(&c, i, &paths, root_dir, false, true);
+        r = unit_file_search(&c, i, &paths, root_dir, false, true, NULL);
         if (r < 0)
                 return r;
 
@@ -1825,6 +1837,7 @@ UnitFileState unit_file_get_state(
         STRV_FOREACH(i, paths.unit_path) {
                 struct stat st;
                 char *partial;
+                bool also = false;
 
                 free(path);
                 path = NULL;
@@ -1869,13 +1882,16 @@ UnitFileState unit_file_get_state(
                 else if (r > 0)
                         return state;
 
-                r = unit_file_can_install(&paths, root_dir, partial, true);
+                r = unit_file_can_install(&paths, root_dir, partial, true, &also);
                 if (r < 0 && errno != ENOENT)
                         return r;
                 else if (r > 0)
                         return UNIT_FILE_DISABLED;
-                else if (r == 0)
+                else if (r == 0) {
+                        if (also)
+                                return UNIT_FILE_INDIRECT;
                         return UNIT_FILE_STATIC;
+                }
         }
 
         return r < 0 ? r : state;
@@ -2242,7 +2258,7 @@ int unit_file_get_list(
                         if (!path)
                                 return -ENOMEM;
 
-                        r = unit_file_can_install(&paths, root_dir, path, true);
+                        r = unit_file_can_install(&paths, root_dir, path, true, NULL);
                         if (r == -EINVAL ||  /* Invalid setting? */
                             r == -EBADMSG || /* Invalid format? */
                             r == -ENOENT     /* Included file not found? */)
@@ -2274,6 +2290,7 @@ static const char* const unit_file_state_table[_UNIT_FILE_STATE_MAX] = {
         [UNIT_FILE_MASKED_RUNTIME] = "masked-runtime",
         [UNIT_FILE_STATIC] = "static",
         [UNIT_FILE_DISABLED] = "disabled",
+        [UNIT_FILE_INDIRECT] = "indirect",
         [UNIT_FILE_INVALID] = "invalid",
 };
 
diff --git a/src/shared/install.h b/src/shared/install.h
index c0b4df69d5..357be0f92d 100644
--- a/src/shared/install.h
+++ b/src/shared/install.h
@@ -41,6 +41,7 @@ typedef enum UnitFileState {
         UNIT_FILE_MASKED_RUNTIME,
         UNIT_FILE_STATIC,
         UNIT_FILE_DISABLED,
+        UNIT_FILE_INDIRECT,
         UNIT_FILE_INVALID,
         _UNIT_FILE_STATE_MAX,
         _UNIT_FILE_STATE_INVALID = -1
@@ -80,6 +81,7 @@ typedef struct {
         char **aliases;
         char **wanted_by;
         char **required_by;
+        char **also;
 
         char *default_instance;
 } InstallInfo;
diff --git a/src/systemctl/systemctl.c b/src/systemctl/systemctl.c
index c903c54e9b..78b7c963e8 100644
--- a/src/systemctl/systemctl.c
+++ b/src/systemctl/systemctl.c
@@ -5660,7 +5660,8 @@ static int unit_is_enabled(sd_bus *bus, char **args) {
 
                         if (state == UNIT_FILE_ENABLED ||
                             state == UNIT_FILE_ENABLED_RUNTIME ||
-                            state == UNIT_FILE_STATIC)
+                            state == UNIT_FILE_STATIC ||
+                            state == UNIT_FILE_INDIRECT)
                                 enabled = true;
 
                         if (!arg_quiet)
@@ -5690,9 +5691,7 @@ static int unit_is_enabled(sd_bus *bus, char **args) {
                         if (r < 0)
                                 return bus_log_parse_error(r);
 
-                        if (streq(s, "enabled") ||
-                            streq(s, "enabled-runtime") ||
-                            streq(s, "static"))
+                        if (STR_IN_SET(s, "enabled", "enabled-runtime", "static", "indirect"))
                                 enabled = true;
 
                         if (!arg_quiet)