varlink: make fields of ExecContext nullable for partial input

We want to allow partial inputs for the ExecContext when we pass
that to io.systemd.Unit.StartTransient. So this commit makes the
fields nullable. Without this the varlink input validation will
reject partial ExecContext objects.

This is similar to 913b81735e for UnitContext.

diff --git a/src/shared/varlink-io.systemd.Unit.c b/src/shared/varlink-io.systemd.Unit.c
index 883154b2f1951c77937fec20888a1bcc510444ce..e62fe40a628e8e6cacac0350ffb2f8436a523fa3 100644 (file)
--- a/src/shared/varlink-io.systemd.Unit.c
+++ b/src/shared/varlink-io.systemd.Unit.c
@@ -600,7 +600,7 @@ static SD_VARLINK_DEFINE_STRUCT_TYPE(
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#RootImageOptions="),
                 SD_VARLINK_DEFINE_FIELD_BY_TYPE(RootImageOptions, PartitionMountOptions, SD_VARLINK_ARRAY|SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#RootEphemeral="),
-                SD_VARLINK_DEFINE_FIELD(RootEphemeral, SD_VARLINK_BOOL, 0),
+                SD_VARLINK_DEFINE_FIELD(RootEphemeral, SD_VARLINK_BOOL, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#RootHash="),
                 SD_VARLINK_DEFINE_FIELD(RootHash, SD_VARLINK_STRING, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#RootHash="),
@@ -612,19 +612,19 @@ static SD_VARLINK_DEFINE_STRUCT_TYPE(
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#RootVerity="),
                 SD_VARLINK_DEFINE_FIELD(RootVerity, SD_VARLINK_STRING, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#RootImagePolicy="),
-                SD_VARLINK_DEFINE_FIELD(RootImagePolicy, SD_VARLINK_STRING, 0),
+                SD_VARLINK_DEFINE_FIELD(RootImagePolicy, SD_VARLINK_STRING, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#RootImagePolicy="),
-                SD_VARLINK_DEFINE_FIELD(MountImagePolicy, SD_VARLINK_STRING, 0),
+                SD_VARLINK_DEFINE_FIELD(MountImagePolicy, SD_VARLINK_STRING, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#RootImagePolicy="),
-                SD_VARLINK_DEFINE_FIELD(ExtensionImagePolicy, SD_VARLINK_STRING, 0),
+                SD_VARLINK_DEFINE_FIELD(ExtensionImagePolicy, SD_VARLINK_STRING, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#MountAPIVFS="),
-                SD_VARLINK_DEFINE_FIELD(MountAPIVFS, SD_VARLINK_STRING, 0),
+                SD_VARLINK_DEFINE_FIELD(MountAPIVFS, SD_VARLINK_STRING, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#BindLogSockets="),
-                SD_VARLINK_DEFINE_FIELD(BindLogSockets, SD_VARLINK_BOOL, 0),
+                SD_VARLINK_DEFINE_FIELD(BindLogSockets, SD_VARLINK_BOOL, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#ProtectProc="),
-                SD_VARLINK_DEFINE_FIELD_BY_TYPE(ProtectProc, ProtectProc, 0),
+                SD_VARLINK_DEFINE_FIELD_BY_TYPE(ProtectProc, ProtectProc, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#ProcSubset="),
-                SD_VARLINK_DEFINE_FIELD_BY_TYPE(ProcSubset, ProcSubset, 0),
+                SD_VARLINK_DEFINE_FIELD_BY_TYPE(ProcSubset, ProcSubset, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#BindPaths="),
                 SD_VARLINK_DEFINE_FIELD_BY_TYPE(BindPaths, BindPath, SD_VARLINK_ARRAY|SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#BindPaths="),
@@ -643,7 +643,7 @@ static SD_VARLINK_DEFINE_STRUCT_TYPE(
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#User="),
                 SD_VARLINK_DEFINE_FIELD(Group, SD_VARLINK_STRING, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#DynamicUser="),
-                SD_VARLINK_DEFINE_FIELD(DynamicUser, SD_VARLINK_BOOL, 0),
+                SD_VARLINK_DEFINE_FIELD(DynamicUser, SD_VARLINK_BOOL, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#SupplementaryGroups="),
                 SD_VARLINK_DEFINE_FIELD(SupplementaryGroups, SD_VARLINK_STRING, SD_VARLINK_ARRAY|SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#SetLoginEnvironment="),
@@ -661,7 +661,7 @@ static SD_VARLINK_DEFINE_STRUCT_TYPE(
                 /* Security
                  * https://www.freedesktop.org/software/systemd/man/latest/systemd.exec.html#Security */
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#NoNewPrivileges="),
-                SD_VARLINK_DEFINE_FIELD(NoNewPrivileges, SD_VARLINK_BOOL, 0),
+                SD_VARLINK_DEFINE_FIELD(NoNewPrivileges, SD_VARLINK_BOOL, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#SecureBits="),
                 SD_VARLINK_DEFINE_FIELD(SecureBits, SD_VARLINK_STRING, SD_VARLINK_ARRAY|SD_VARLINK_NULLABLE),
 
@@ -677,13 +677,13 @@ static SD_VARLINK_DEFINE_STRUCT_TYPE(
                 /* Process Properties
                  * https://www.freedesktop.org/software/systemd/man/latest/systemd.exec.html#Process%20Properties */
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#LimitCPU="),
-                SD_VARLINK_DEFINE_FIELD_BY_TYPE(Limits, ResourceLimitTable, 0),
+                SD_VARLINK_DEFINE_FIELD_BY_TYPE(Limits, ResourceLimitTable, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#UMask="),
                 SD_VARLINK_DEFINE_FIELD(UMask, SD_VARLINK_INT, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#CoredumpFilter="),
                 SD_VARLINK_DEFINE_FIELD(CoredumpFilter, SD_VARLINK_INT, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#KeyringMode="),
-                SD_VARLINK_DEFINE_FIELD_BY_TYPE(KeyringMode, ExecKeyringMode, 0),
+                SD_VARLINK_DEFINE_FIELD_BY_TYPE(KeyringMode, ExecKeyringMode, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#OOMScoreAdjust="),
                 SD_VARLINK_DEFINE_FIELD(OOMScoreAdjust, SD_VARLINK_INT, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#TimerSlackNSec="),
@@ -691,18 +691,18 @@ static SD_VARLINK_DEFINE_STRUCT_TYPE(
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#Personality="),
                 SD_VARLINK_DEFINE_FIELD(Personality, SD_VARLINK_STRING, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#IgnoreSIGPIPE="),
-                SD_VARLINK_DEFINE_FIELD(IgnoreSIGPIPE, SD_VARLINK_BOOL, 0),
+                SD_VARLINK_DEFINE_FIELD(IgnoreSIGPIPE, SD_VARLINK_BOOL, SD_VARLINK_NULLABLE),
 
                 /* Scheduling
                  * https://www.freedesktop.org/software/systemd/man/latest/systemd.exec.html#Scheduling */
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#Nice="),
-                SD_VARLINK_DEFINE_FIELD(Nice, SD_VARLINK_INT, 0),
+                SD_VARLINK_DEFINE_FIELD(Nice, SD_VARLINK_INT, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#CPUSchedulingPolicy="),
-                SD_VARLINK_DEFINE_FIELD_BY_TYPE(CPUSchedulingPolicy, CPUSchedulingPolicy, 0),
+                SD_VARLINK_DEFINE_FIELD_BY_TYPE(CPUSchedulingPolicy, CPUSchedulingPolicy, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#CPUSchedulingPriority="),
-                SD_VARLINK_DEFINE_FIELD(CPUSchedulingPriority, SD_VARLINK_INT, 0),
+                SD_VARLINK_DEFINE_FIELD(CPUSchedulingPriority, SD_VARLINK_INT, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#CPUSchedulingResetOnFork="),
-                SD_VARLINK_DEFINE_FIELD(CPUSchedulingResetOnFork, SD_VARLINK_BOOL, 0),
+                SD_VARLINK_DEFINE_FIELD(CPUSchedulingResetOnFork, SD_VARLINK_BOOL, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#CPUAffinity="),
                 SD_VARLINK_DEFINE_FIELD_BY_TYPE(CPUAffinity, CPUAffinity, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#NUMAPolicy="),
@@ -710,21 +710,21 @@ static SD_VARLINK_DEFINE_STRUCT_TYPE(
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#NUMAMask="),
                 SD_VARLINK_DEFINE_FIELD(NUMAMask, SD_VARLINK_INT, SD_VARLINK_ARRAY|SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#IOSchedulingClass="),
-                SD_VARLINK_DEFINE_FIELD_BY_TYPE(IOSchedulingClass, IOSchedulingClass, 0),
+                SD_VARLINK_DEFINE_FIELD_BY_TYPE(IOSchedulingClass, IOSchedulingClass, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#IOSchedulingPriority="),
-                SD_VARLINK_DEFINE_FIELD(IOSchedulingPriority, SD_VARLINK_INT, 0),
+                SD_VARLINK_DEFINE_FIELD(IOSchedulingPriority, SD_VARLINK_INT, SD_VARLINK_NULLABLE),
 
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#MemoryKSM="),
                 SD_VARLINK_DEFINE_FIELD(MemoryKSM, SD_VARLINK_BOOL, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#MemoryTHP="),
-                SD_VARLINK_DEFINE_FIELD_BY_TYPE(MemoryTHP, MemoryTHP, 0),
+                SD_VARLINK_DEFINE_FIELD_BY_TYPE(MemoryTHP, MemoryTHP, SD_VARLINK_NULLABLE),
 
                 /* Sandboxing
                  * https://www.freedesktop.org/software/systemd/man/latest/systemd.exec.html#Sandboxing */
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#ProtectSystem="),
-                SD_VARLINK_DEFINE_FIELD_BY_TYPE(ProtectSystem, ProtectSystem, 0),
+                SD_VARLINK_DEFINE_FIELD_BY_TYPE(ProtectSystem, ProtectSystem, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#ProtectHome="),
-                SD_VARLINK_DEFINE_FIELD_BY_TYPE(ProtectHome, ProtectHome, 0),
+                SD_VARLINK_DEFINE_FIELD_BY_TYPE(ProtectHome, ProtectHome, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#RuntimeDirectory="),
                 SD_VARLINK_DEFINE_FIELD_BY_TYPE(RuntimeDirectory, ExecDirectory, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#RuntimeDirectory="),
@@ -736,7 +736,7 @@ static SD_VARLINK_DEFINE_STRUCT_TYPE(
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#RuntimeDirectory="),
                 SD_VARLINK_DEFINE_FIELD_BY_TYPE(ConfigurationDirectory, ExecDirectory, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#RuntimeDirectoryPreserve="),
-                SD_VARLINK_DEFINE_FIELD_BY_TYPE(RuntimeDirectoryPreserve, ExecPreserveMode, 0),
+                SD_VARLINK_DEFINE_FIELD_BY_TYPE(RuntimeDirectoryPreserve, ExecPreserveMode, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#TimeoutCleanSec="),
                 SD_VARLINK_DEFINE_FIELD(TimeoutCleanUSec, SD_VARLINK_INT, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#ReadWritePaths="),
@@ -752,35 +752,35 @@ static SD_VARLINK_DEFINE_STRUCT_TYPE(
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#TemporaryFileSystem="),
                 SD_VARLINK_DEFINE_FIELD_BY_TYPE(TemporaryFileSystem, TemporaryFilesystem, SD_VARLINK_ARRAY|SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#PrivateTmp="),
-                SD_VARLINK_DEFINE_FIELD_BY_TYPE(PrivateTmp, PrivateTmp, 0),
+                SD_VARLINK_DEFINE_FIELD_BY_TYPE(PrivateTmp, PrivateTmp, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#PrivateDevices="),
-                SD_VARLINK_DEFINE_FIELD(PrivateDevices, SD_VARLINK_STRING, 0),
+                SD_VARLINK_DEFINE_FIELD(PrivateDevices, SD_VARLINK_STRING, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#PrivateNetwork="),
-                SD_VARLINK_DEFINE_FIELD(PrivateNetwork, SD_VARLINK_STRING, 0),
+                SD_VARLINK_DEFINE_FIELD(PrivateNetwork, SD_VARLINK_STRING, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#NetworkNamespacePath="),
                 SD_VARLINK_DEFINE_FIELD(NetworkNamespacePath, SD_VARLINK_STRING, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#PrivateIPC="),
-                SD_VARLINK_DEFINE_FIELD(PrivateIPC, SD_VARLINK_STRING, 0),
+                SD_VARLINK_DEFINE_FIELD(PrivateIPC, SD_VARLINK_STRING, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#IPCNamespacePath="),
                 SD_VARLINK_DEFINE_FIELD(IPCNamespacePath, SD_VARLINK_STRING, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#PrivatePIDs="),
-                SD_VARLINK_DEFINE_FIELD_BY_TYPE(PrivatePIDs, PrivatePIDs, 0),
+                SD_VARLINK_DEFINE_FIELD_BY_TYPE(PrivatePIDs, PrivatePIDs, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#PrivateUsers="),
-                SD_VARLINK_DEFINE_FIELD_BY_TYPE(PrivateUsers, PrivateUsers, 0),
+                SD_VARLINK_DEFINE_FIELD_BY_TYPE(PrivateUsers, PrivateUsers, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#UserNamespacePath="),
                 SD_VARLINK_DEFINE_FIELD(UserNamespacePath, SD_VARLINK_STRING, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#ProtectHostname="),
-                SD_VARLINK_DEFINE_FIELD_BY_TYPE(ProtectHostname, ProtectHostname, 0),
+                SD_VARLINK_DEFINE_FIELD_BY_TYPE(ProtectHostname, ProtectHostname, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#ProtectClock="),
-                SD_VARLINK_DEFINE_FIELD(ProtectClock, SD_VARLINK_STRING, 0),
+                SD_VARLINK_DEFINE_FIELD(ProtectClock, SD_VARLINK_STRING, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#ProtectKernelTunables="),
-                SD_VARLINK_DEFINE_FIELD(ProtectKernelTunables, SD_VARLINK_STRING, 0),
+                SD_VARLINK_DEFINE_FIELD(ProtectKernelTunables, SD_VARLINK_STRING, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#ProtectKernelModules="),
-                SD_VARLINK_DEFINE_FIELD(ProtectKernelModules, SD_VARLINK_STRING, 0),
+                SD_VARLINK_DEFINE_FIELD(ProtectKernelModules, SD_VARLINK_STRING, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#ProtectKernelLogs="),
-                SD_VARLINK_DEFINE_FIELD(ProtectKernelLogs, SD_VARLINK_STRING, 0),
+                SD_VARLINK_DEFINE_FIELD(ProtectKernelLogs, SD_VARLINK_STRING, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#ProtectControlGroups="),
-                SD_VARLINK_DEFINE_FIELD_BY_TYPE(ProtectControlGroups, ProtectControlGroups, 0),
+                SD_VARLINK_DEFINE_FIELD_BY_TYPE(ProtectControlGroups, ProtectControlGroups, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#RestrictAddressFamilies="),
                 SD_VARLINK_DEFINE_FIELD_BY_TYPE(RestrictAddressFamilies, AddressFamilyList, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#RestrictFileSystems="),
@@ -790,7 +790,7 @@ static SD_VARLINK_DEFINE_STRUCT_TYPE(
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#DelegateNamespaces="),
                 SD_VARLINK_DEFINE_FIELD(DelegateNamespaces, SD_VARLINK_STRING, SD_VARLINK_ARRAY|SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#PrivatePBF="),
-                SD_VARLINK_DEFINE_FIELD_BY_TYPE(PrivatePBF, PrivateBPF, 0),
+                SD_VARLINK_DEFINE_FIELD_BY_TYPE(PrivatePBF, PrivateBPF, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#BPFDelegateCommands="),
                 SD_VARLINK_DEFINE_FIELD(BPFDelegateCommands, SD_VARLINK_STRING, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#BPFDelegateMaps="),
@@ -800,15 +800,15 @@ static SD_VARLINK_DEFINE_STRUCT_TYPE(
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#BPFDelegateAttachments="),
                 SD_VARLINK_DEFINE_FIELD(BPFDelegateAttachments, SD_VARLINK_STRING, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#LockPersonality="),
-                SD_VARLINK_DEFINE_FIELD(LockPersonality, SD_VARLINK_BOOL, 0),
+                SD_VARLINK_DEFINE_FIELD(LockPersonality, SD_VARLINK_BOOL, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#MemoryDenyWriteExecute="),
-                SD_VARLINK_DEFINE_FIELD(MemoryDenyWriteExecute, SD_VARLINK_BOOL, 0),
+                SD_VARLINK_DEFINE_FIELD(MemoryDenyWriteExecute, SD_VARLINK_BOOL, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#RestrictRealtime="),
-                SD_VARLINK_DEFINE_FIELD(RestrictRealtime, SD_VARLINK_BOOL, 0),
+                SD_VARLINK_DEFINE_FIELD(RestrictRealtime, SD_VARLINK_BOOL, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#RestrictSUIDSGID="),
-                SD_VARLINK_DEFINE_FIELD(RestrictSUIDSGID, SD_VARLINK_BOOL, 0),
+                SD_VARLINK_DEFINE_FIELD(RestrictSUIDSGID, SD_VARLINK_BOOL, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("Whether to remove all System V and POSIX IPC objects owned by the user and group this unit runs under"),
-                SD_VARLINK_DEFINE_FIELD(RemoveIPC, SD_VARLINK_BOOL, 0),
+                SD_VARLINK_DEFINE_FIELD(RemoveIPC, SD_VARLINK_BOOL, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#PrivateMounts="),
                 SD_VARLINK_DEFINE_FIELD(PrivateMounts, SD_VARLINK_BOOL, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#MountFlags="),
@@ -839,11 +839,11 @@ static SD_VARLINK_DEFINE_STRUCT_TYPE(
                 /* Logging and Standard Input/Output
                  * https://www.freedesktop.org/software/systemd/man/latest/systemd.exec.html#Logging%20and%20Standard%20Input/Output */
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#StandardInput="),
-                SD_VARLINK_DEFINE_FIELD_BY_TYPE(StandardInput, ExecInputType, 0),
+                SD_VARLINK_DEFINE_FIELD_BY_TYPE(StandardInput, ExecInputType, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#StandardOutput="),
-                SD_VARLINK_DEFINE_FIELD_BY_TYPE(StandardOutput, ExecOutputType, 0),
+                SD_VARLINK_DEFINE_FIELD_BY_TYPE(StandardOutput, ExecOutputType, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#StandardError="),
-                SD_VARLINK_DEFINE_FIELD_BY_TYPE(StandardError, ExecOutputType, 0),
+                SD_VARLINK_DEFINE_FIELD_BY_TYPE(StandardError, ExecOutputType, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("The file descriptor name to connect standard input to"),
                 SD_VARLINK_DEFINE_FIELD(StandardInputFileDescriptorName, SD_VARLINK_STRING, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("The file descriptor name to connect standard output to"),
@@ -869,7 +869,7 @@ static SD_VARLINK_DEFINE_STRUCT_TYPE(
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#SyslogLevel="),
                 SD_VARLINK_DEFINE_FIELD(SyslogLevel, SD_VARLINK_STRING, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#SyslogLevelPrefix="),
-                SD_VARLINK_DEFINE_FIELD(SyslogLevelPrefix, SD_VARLINK_BOOL, 0),
+                SD_VARLINK_DEFINE_FIELD(SyslogLevelPrefix, SD_VARLINK_BOOL, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#TTYPath="),
                 SD_VARLINK_DEFINE_FIELD(TTYPath, SD_VARLINK_STRING, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#TTYReset="),
@@ -901,7 +901,7 @@ static SD_VARLINK_DEFINE_STRUCT_TYPE(
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#UtmpIdentifier="),
                 SD_VARLINK_DEFINE_FIELD(UtmpIdentifier, SD_VARLINK_STRING, SD_VARLINK_NULLABLE),
                 SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man"PROJECT_VERSION_STR"systemd.exec.html#UtmpMode="),
-                SD_VARLINK_DEFINE_FIELD_BY_TYPE(UtmpMode, ExecUtmpMode, 0));
+                SD_VARLINK_DEFINE_FIELD_BY_TYPE(UtmpMode, ExecUtmpMode, SD_VARLINK_NULLABLE));
 
 SD_VARLINK_DEFINE_ENUM_TYPE(
                 KillMode,