everywhere: remove configurability of sysv runlevel to target mapping

With this change runlevel 2, 3, 4 are mapped to multi-user.target for
good, and 5 to graphical.target. This was already the previous mapping
but is now no longer reconfigurable, but hard-coded into the core.

This should generally simplify things, but also fix one bug: the
sysv-generator previously generated symlinks to runlevel[2-5].target
units, which possibly weren't picked up if these aliases were otherwise
only referenced by the real names "multi-user.target" and
"graphical.target".

We keep compat aliases "runlevel[2345].target" arround for cases where
this target name is explicitly requested.

7 files changed, 34 insertions, 51 deletions

diff --git a/Makefile.am b/Makefile.am
index d9d71df9ef..ba63f681d1 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -242,14 +242,11 @@ endef
 
 INSTALL_DIRS =
 
-RUNLEVEL1_TARGET_WANTS =
-RUNLEVEL2_TARGET_WANTS =
-RUNLEVEL3_TARGET_WANTS =
-RUNLEVEL4_TARGET_WANTS =
-RUNLEVEL5_TARGET_WANTS =
 SHUTDOWN_TARGET_WANTS =
 LOCAL_FS_TARGET_WANTS =
 MULTI_USER_TARGET_WANTS =
+GRAPHICAL_TARGET_WANTS =
+RESCUE_TARGET_WANTS =
 SYSINIT_TARGET_WANTS =
 SOCKETS_TARGET_WANTS =
 BUSNAMES_TARGET_WANTS =
@@ -263,14 +260,11 @@ USER_UNIT_ALIASES =
 GENERAL_ALIASES =
 
 install-target-wants-hook:
-	what="$(RUNLEVEL1_TARGET_WANTS)" && wants=runlevel1.target && dir=$(systemunitdir) && $(add-wants)
-	what="$(RUNLEVEL2_TARGET_WANTS)" && wants=runlevel2.target && dir=$(systemunitdir) && $(add-wants)
-	what="$(RUNLEVEL3_TARGET_WANTS)" && wants=runlevel3.target && dir=$(systemunitdir) && $(add-wants)
-	what="$(RUNLEVEL4_TARGET_WANTS)" && wants=runlevel4.target && dir=$(systemunitdir) && $(add-wants)
-	what="$(RUNLEVEL5_TARGET_WANTS)" && wants=runlevel5.target && dir=$(systemunitdir) && $(add-wants)
 	what="$(SHUTDOWN_TARGET_WANTS)" && wants=shutdown.target && dir=$(systemunitdir) && $(add-wants)
 	what="$(LOCAL_FS_TARGET_WANTS)" && wants=local-fs.target && dir=$(systemunitdir) && $(add-wants)
 	what="$(MULTI_USER_TARGET_WANTS)" && wants=multi-user.target && dir=$(systemunitdir) && $(add-wants)
+	what="$(GRAPHICAL_TARGET_WANTS)" && wants=graphical.target && dir=$(systemunitdir) && $(add-wants)
+	what="$(RESCUE_TARGET_WANTS)" && wants=rescue.target && dir=$(systemunitdir) && $(add-wants)
 	what="$(SYSINIT_TARGET_WANTS)" && wants=sysinit.target && dir=$(systemunitdir) && $(add-wants)
 	what="$(SOCKETS_TARGET_WANTS)" && wants=sockets.target && dir=$(systemunitdir) && $(add-wants)
 	what="$(TIMERS_TARGET_WANTS)" && wants=timers.target && dir=$(systemunitdir) && $(add-wants)
@@ -6572,15 +6566,11 @@ SOCKETS_TARGET_WANTS += \
 
 if HAVE_UTMP
 if HAVE_SYSV_COMPAT
-RUNLEVEL1_TARGET_WANTS += \
-	systemd-update-utmp-runlevel.service
-RUNLEVEL2_TARGET_WANTS += \
-	systemd-update-utmp-runlevel.service
-RUNLEVEL3_TARGET_WANTS += \
+MULTI_USER_TARGET_WANTS += \
 	systemd-update-utmp-runlevel.service
-RUNLEVEL4_TARGET_WANTS += \
+GRAPHICAL_TARGET_WANTS += \
 	systemd-update-utmp-runlevel.service
-RUNLEVEL5_TARGET_WANTS += \
+RESCUE_TARGET_WANTS += \
 	systemd-update-utmp-runlevel.service
 endif
 
diff --git a/src/core/main.c b/src/core/main.c
index ba2de85bd3..08f46f569a 100644
--- a/src/core/main.c
+++ b/src/core/main.c
@@ -280,10 +280,10 @@ static int parse_proc_cmdline_item(const char *key, const char *value) {
                 "s",         SPECIAL_RESCUE_TARGET,
                 "S",         SPECIAL_RESCUE_TARGET,
                 "1",         SPECIAL_RESCUE_TARGET,
-                "2",         SPECIAL_RUNLEVEL2_TARGET,
-                "3",         SPECIAL_RUNLEVEL3_TARGET,
-                "4",         SPECIAL_RUNLEVEL4_TARGET,
-                "5",         SPECIAL_RUNLEVEL5_TARGET,
+                "2",         SPECIAL_MULTI_USER_TARGET,
+                "3",         SPECIAL_MULTI_USER_TARGET,
+                "4",         SPECIAL_MULTI_USER_TARGET,
+                "5",         SPECIAL_GRAPHICAL_TARGET,
         };
         int r;
 
diff --git a/src/initctl/initctl.c b/src/initctl/initctl.c
index 7a6a383b32..8b632e88ae 100644
--- a/src/initctl/initctl.c
+++ b/src/initctl/initctl.c
@@ -78,15 +78,15 @@ static const char *translate_runlevel(int runlevel, bool *isolate) {
                 const char *special;
                 bool isolate;
         } table[] = {
-                { '0', SPECIAL_POWEROFF_TARGET,  false },
-                { '1', SPECIAL_RESCUE_TARGET,    true  },
-                { 's', SPECIAL_RESCUE_TARGET,    true  },
-                { 'S', SPECIAL_RESCUE_TARGET,    true  },
-                { '2', SPECIAL_RUNLEVEL2_TARGET, true  },
-                { '3', SPECIAL_RUNLEVEL3_TARGET, true  },
-                { '4', SPECIAL_RUNLEVEL4_TARGET, true  },
-                { '5', SPECIAL_RUNLEVEL5_TARGET, true  },
-                { '6', SPECIAL_REBOOT_TARGET,    false },
+                { '0', SPECIAL_POWEROFF_TARGET,   false },
+                { '1', SPECIAL_RESCUE_TARGET,     true  },
+                { 's', SPECIAL_RESCUE_TARGET,     true  },
+                { 'S', SPECIAL_RESCUE_TARGET,     true  },
+                { '2', SPECIAL_MULTI_USER_TARGET, true  },
+                { '3', SPECIAL_MULTI_USER_TARGET, true  },
+                { '4', SPECIAL_MULTI_USER_TARGET, true  },
+                { '5', SPECIAL_GRAPHICAL_TARGET,  true  },
+                { '6', SPECIAL_REBOOT_TARGET,     false },
         };
 
         unsigned i;
diff --git a/src/shared/special.h b/src/shared/special.h
index b045047d36..e51310eb6d 100644
--- a/src/shared/special.h
+++ b/src/shared/special.h
@@ -42,6 +42,8 @@
 /* Special boot targets */
 #define SPECIAL_RESCUE_TARGET "rescue.target"
 #define SPECIAL_EMERGENCY_TARGET "emergency.target"
+#define SPECIAL_MULTI_USER_TARGET "multi-user.target"
+#define SPECIAL_GRAPHICAL_TARGET "graphical.target"
 
 /* Early boot targets */
 #define SPECIAL_SYSINIT_TARGET "sysinit.target"
@@ -108,13 +110,6 @@
 #define SPECIAL_SIGPWR_TARGET "sigpwr.target"
 #define SPECIAL_CTRL_ALT_DEL_TARGET "ctrl-alt-del.target"
 
-/* For SysV compatibility. Usually an alias for a saner target. On
- * SysV-free systems this doesn't exist. */
-#define SPECIAL_RUNLEVEL2_TARGET "runlevel2.target"
-#define SPECIAL_RUNLEVEL3_TARGET "runlevel3.target"
-#define SPECIAL_RUNLEVEL4_TARGET "runlevel4.target"
-#define SPECIAL_RUNLEVEL5_TARGET "runlevel5.target"
-
 /* Where we add all our system units, users and machines by default */
 #define SPECIAL_SYSTEM_SLICE "system.slice"
 #define SPECIAL_USER_SLICE "user.slice"
diff --git a/src/systemctl/systemctl.c b/src/systemctl/systemctl.c
index afd4b7171c..9b083131df 100644
--- a/src/systemctl/systemctl.c
+++ b/src/systemctl/systemctl.c
@@ -2650,10 +2650,10 @@ static const struct {
         [ACTION_POWEROFF]     = { SPECIAL_POWEROFF_TARGET,     "poweroff",     "replace-irreversibly" },
         [ACTION_REBOOT]       = { SPECIAL_REBOOT_TARGET,       "reboot",       "replace-irreversibly" },
         [ACTION_KEXEC]        = { SPECIAL_KEXEC_TARGET,        "kexec",        "replace-irreversibly" },
-        [ACTION_RUNLEVEL2]    = { SPECIAL_RUNLEVEL2_TARGET,    NULL,           "isolate" },
-        [ACTION_RUNLEVEL3]    = { SPECIAL_RUNLEVEL3_TARGET,    NULL,           "isolate" },
-        [ACTION_RUNLEVEL4]    = { SPECIAL_RUNLEVEL4_TARGET,    NULL,           "isolate" },
-        [ACTION_RUNLEVEL5]    = { SPECIAL_RUNLEVEL5_TARGET,    NULL,           "isolate" },
+        [ACTION_RUNLEVEL2]    = { SPECIAL_MULTI_USER_TARGET,   NULL,           "isolate" },
+        [ACTION_RUNLEVEL3]    = { SPECIAL_MULTI_USER_TARGET,   NULL,           "isolate" },
+        [ACTION_RUNLEVEL4]    = { SPECIAL_MULTI_USER_TARGET,   NULL,           "isolate" },
+        [ACTION_RUNLEVEL5]    = { SPECIAL_GRAPHICAL_TARGET,    NULL,           "isolate" },
         [ACTION_RESCUE]       = { SPECIAL_RESCUE_TARGET,       "rescue",       "isolate" },
         [ACTION_EMERGENCY]    = { SPECIAL_EMERGENCY_TARGET,    "emergency",    "isolate" },
         [ACTION_DEFAULT]      = { SPECIAL_DEFAULT_TARGET,      "default",      "isolate" },
diff --git a/src/sysv-generator/sysv-generator.c b/src/sysv-generator/sysv-generator.c
index 6e39b449eb..2091854e08 100644
--- a/src/sysv-generator/sysv-generator.c
+++ b/src/sysv-generator/sysv-generator.c
@@ -51,11 +51,11 @@ static const struct {
         const RunlevelType type;
 } rcnd_table[] = {
         /* Standard SysV runlevels for start-up */
-        { "rc1.d",  SPECIAL_RESCUE_TARGET,    RUNLEVEL_UP },
-        { "rc2.d",  SPECIAL_RUNLEVEL2_TARGET, RUNLEVEL_UP },
-        { "rc3.d",  SPECIAL_RUNLEVEL3_TARGET, RUNLEVEL_UP },
-        { "rc4.d",  SPECIAL_RUNLEVEL4_TARGET, RUNLEVEL_UP },
-        { "rc5.d",  SPECIAL_RUNLEVEL5_TARGET, RUNLEVEL_UP },
+        { "rc1.d",  SPECIAL_RESCUE_TARGET,     RUNLEVEL_UP },
+        { "rc2.d",  SPECIAL_MULTI_USER_TARGET, RUNLEVEL_UP },
+        { "rc3.d",  SPECIAL_MULTI_USER_TARGET, RUNLEVEL_UP },
+        { "rc4.d",  SPECIAL_MULTI_USER_TARGET, RUNLEVEL_UP },
+        { "rc5.d",  SPECIAL_GRAPHICAL_TARGET,  RUNLEVEL_UP },
 
         /* Standard SysV runlevels for shutdown */
         { "rc0.d",  SPECIAL_POWEROFF_TARGET,  RUNLEVEL_DOWN },
diff --git a/src/update-utmp/update-utmp.c b/src/update-utmp/update-utmp.c
index 15da83193b..5e7498c9e2 100644
--- a/src/update-utmp/update-utmp.c
+++ b/src/update-utmp/update-utmp.c
@@ -80,11 +80,9 @@ static int get_current_runlevel(Context *c) {
                  * here over the others, since these are the main
                  * runlevels used on Fedora. It might make sense to
                  * change the order on some distributions. */
-                { '5', SPECIAL_RUNLEVEL5_TARGET },
-                { '3', SPECIAL_RUNLEVEL3_TARGET },
-                { '4', SPECIAL_RUNLEVEL4_TARGET },
-                { '2', SPECIAL_RUNLEVEL2_TARGET },
-                { '1', SPECIAL_RESCUE_TARGET },
+                { '5', SPECIAL_GRAPHICAL_TARGET  },
+                { '3', SPECIAL_MULTI_USER_TARGET },
+                { '1', SPECIAL_RESCUE_TARGET     },
         };
 
         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;