initial

.gitignore

@@ -0,0 +1,2 @@
+/bin/
+/obj/

.idea/.idea.nalpm.dir/.idea/.gitignore

@@ -0,0 +1,13 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Rider ignored files
+/modules.xml
+/contentModel.xml
+/projectSettingsUpdater.xml
+/.idea.nalpm.iml
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
+# Editor-based HTTP Client requests
+/httpRequests/

.idea/.idea.nalpm.dir/.idea/.idea.nalpm.dir.iml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="RIDER_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

.idea/.idea.nalpm.dir/.idea/encodings.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding" addBOMForNewFiles="with BOM under Windows, with no BOM otherwise" />
+</project>

.idea/.idea.nalpm.dir/.idea/indexLayout.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ContentModelUserStore">
+    <attachedFolders />
+    <explicitIncludes />
+    <explicitExcludes />
+  </component>
+</project>

.idea/.idea.nalpm.dir/.idea/misc.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="JavaScriptSettings">
+    <option name="languageLevel" value="ES6" />
+  </component>
+</project>

.idea/.idea.nalpm.dir/.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/.." vcs="Git" />
+  </component>
+</project>

.idea/.idea.nalpm.dir/riderModule.iml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="RIDER_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$/../.." />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

Alpm.cs

@@ -0,0 +1,963 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Runtime.CompilerServices;
+using System.Runtime.ConstrainedExecution;
+using System.Runtime.InteropServices;
+using System.Runtime.Serialization;
+
+// ReSharper disable MemberCanBePrivate.Global
+// ReSharper disable UnassignedReadonlyField
+// ReSharper disable UnusedMember.Global
+
+// ReSharper disable InconsistentNaming
+
+namespace nalpm
+{
+    public enum errno_t
+    {
+        ERR_OK = 0,
+        ERR_MEMORY,
+        ERR_SYSTEM,
+        ERR_BADPERMS,
+        ERR_NOT_A_FILE,
+        ERR_NOT_A_DIR,
+        ERR_WRONG_ARGS,
+        ERR_DISK_SPACE,
+
+        /* Interface */
+        ERR_HANDLE_NULL,
+        ERR_HANDLE_NOT_NULL,
+        ERR_HANDLE_LOCK,
+
+        /* Databases */
+        ERR_DB_OPEN,
+        ERR_DB_CREATE,
+        ERR_DB_NULL,
+        ERR_DB_NOT_NULL,
+        ERR_DB_NOT_FOUND,
+        ERR_DB_INVALID,
+        ERR_DB_INVALID_SIG,
+        ERR_DB_VERSION,
+        ERR_DB_WRITE,
+        ERR_DB_REMOVE,
+
+        /* Servers */
+        ERR_SERVER_BAD_URL,
+        ERR_SERVER_NONE,
+
+        /* Transactions */
+        ERR_TRANS_NOT_NULL,
+        ERR_TRANS_NULL,
+        ERR_TRANS_DUP_TARGET,
+        ERR_TRANS_NOT_INITIALIZED,
+        ERR_TRANS_NOT_PREPARED,
+        ERR_TRANS_ABORT,
+        ERR_TRANS_TYPE,
+        ERR_TRANS_NOT_LOCKED,
+        ERR_TRANS_HOOK_FAILED,
+
+        /* Packages */
+        ERR_PKG_NOT_FOUND,
+        ERR_PKG_IGNORED,
+        ERR_PKG_INVALID,
+        ERR_PKG_INVALID_CHECKSUM,
+        ERR_PKG_INVALID_SIG,
+        ERR_PKG_MISSING_SIG,
+        ERR_PKG_OPEN,
+        ERR_PKG_CANT_REMOVE,
+        ERR_PKG_INVALID_NAME,
+        ERR_PKG_INVALID_ARCH,
+        ERR_PKG_REPO_NOT_FOUND,
+
+        /* Signatures */
+        ERR_SIG_MISSING,
+        ERR_SIG_INVALID,
+
+        /* Dependencies */
+        ERR_UNSATISFIED_DEPS,
+        ERR_CONFLICTING_DEPS,
+        ERR_FILE_CONFLICTS,
+
+        /* Misc */
+        ERR_RETRIEVE,
+        ERR_INVALID_REGEX,
+
+        /* External library errors */
+        ERR_LIBARCHIVE,
+        ERR_LIBCURL,
+        ERR_EXTERNAL_DOWNLOAD,
+        ERR_GPGME,
+
+        /* Missing compile-time features */
+        ERR_MISSING_CAPABILITY_SIGNATURES
+    }
+
+    /** Package install reasons. */
+    enum alpm_pkgreason_t
+    {
+        /** Explicitly requested by the user. */
+        PKG_REASON_EXPLICIT = 0,
+
+        /** Installed as a dependency for another package. */
+        PKG_REASON_DEPEND = 1
+    }
+
+
+    /** Location a package object was loaded from. */
+    enum alpm_pkgfrom_t
+    {
+        PKG_FROM_FILE = 1,
+        PKG_FROM_LOCALDB,
+        PKG_FROM_SYNCDB
+    }
+
+    /** Method used to validate a package. */
+    enum alpm_pkgvalidation_t
+    {
+        PKG_VALIDATION_UNKNOWN = 0,
+        PKG_VALIDATION_NONE = (1 << 0),
+        PKG_VALIDATION_MD5SUM = (1 << 1),
+        PKG_VALIDATION_SHA256SUM = (1 << 2),
+        PKG_VALIDATION_SIGNATURE = (1 << 3)
+    }
+
+    /** Types of version constraints in dependency specs. */
+    public enum alpm_depmod_t
+    {
+        /** No version constraint */
+        DEP_MOD_ANY = 1,
+
+        /** Test version equality (package=x.y.z) */
+        DEP_MOD_EQ,
+
+        /** Test for at least a version (package>=x.y.z) */
+        DEP_MOD_GE,
+
+        /** Test for at most a version (package<=x.y.z) */
+        DEP_MOD_LE,
+
+        /** Test for greater than some version (package>x.y.z) */
+        DEP_MOD_GT,
+
+        /** Test for less than some version (package<x.y.z) */
+        DEP_MOD_LT
+    }
+
+    /**
+     * File conflict type.
+     * Whether the conflict results from a file existing on the filesystem, or with
+     * another target in the transaction.
+     */
+    enum alpm_fileconflicttype_t
+    {
+        FILECONFLICT_TARGET = 1,
+        FILECONFLICT_FILESYSTEM
+    }
+
+    /** PGP signature verification options */
+    [Flags]
+    public enum SigLevel
+    {
+        SIG_PACKAGE = (1 << 0),
+        SIG_PACKAGE_OPTIONAL = (1 << 1),
+        SIG_PACKAGE_MARGINAL_OK = (1 << 2),
+        SIG_PACKAGE_UNKNOWN_OK = (1 << 3),
+
+        SIG_DATABASE = (1 << 10),
+        SIG_DATABASE_OPTIONAL = (1 << 11),
+        SIG_DATABASE_MARGINAL_OK = (1 << 12),
+        SIG_DATABASE_UNKNOWN_OK = (1 << 13),
+        SIG_USE_DEFAULT = (1 << 31)
+    }
+
+    /** PGP signature verification status return codes */
+    enum alpm_sigstatus_t
+    {
+        SIGSTATUS_VALID,
+        SIGSTATUS_KEY_EXPIRED,
+        SIGSTATUS_SIG_EXPIRED,
+        SIGSTATUS_KEY_UNKNOWN,
+        SIGSTATUS_KEY_DISABLED,
+        SIGSTATUS_INVALID
+    }
+
+    /** PGP signature verification status return codes */
+    enum alpm_sigvalidity_t
+    {
+        SIGVALIDITY_FULL,
+        SIGVALIDITY_MARGINAL,
+        SIGVALIDITY_NEVER,
+        SIGVALIDITY_UNKNOWN
+    }
+
+    /** Dependency */
+    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
+    public struct alpm_depend_t
+    {
+        string name;
+        string version;
+        string desc;
+        public ulong name_hash;
+        public alpm_depmod_t mod;
+    }
+
+    [StructLayout(LayoutKind.Sequential)]
+    public struct AlpmDependPtr
+    {
+        private IntPtr ptr;
+
+        public alpm_depend_t Unmarshal()
+        {
+            return Marshal.PtrToStructure<alpm_depend_t>(ptr);
+        }
+    }
+
+    /** Missing dependency */
+    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
+    public struct alpm_depmissing_t
+    {
+        public string target;
+
+        public AlpmDependPtr depend;
+
+        /* this is used only in the case of a remove dependency error */
+        public string causingpkg;
+    }
+
+    [StructLayout(LayoutKind.Sequential)]
+    /** Conflict */
+    public struct alpm_conflict_t
+    {
+        public ulong package1_hash;
+        public ulong package2_hash;
+        public string package1;
+        public string package2;
+        public AlpmDependPtr reason;
+    }
+
+    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
+    /** File conflict */
+    struct alpm_fileconflict_t
+    {
+        public string target;
+        public alpm_fileconflicttype_t type;
+        public string file;
+        public string ctarget;
+    }
+
+    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
+    /** Package group */
+    public readonly struct alpm_group_t
+    {
+        /** group name */
+        public readonly string name;
+
+        /** list of alpm_pkg_t packages */
+        public readonly unsafe alpm_list_t* packages;
+    }
+
+    /* TODO: alpm_pkg_get_files - need to wrap */
+    /** File in a package */
+    public readonly struct alpm_file_t
+    {
+        public readonly string name;
+        public readonly UIntPtr size;
+        public readonly uint mode;
+    }
+
+    /** Package filelist container */
+    public struct _alpm_filelist_t
+    {
+        public UIntPtr count;
+        private IntPtr files;
+
+        /* FIXME: This is broken as shit */
+        public alpm_file_t[] Unmarshal()
+        {
+            var iCount = (int) this.count;
+            var byteCount = Marshal.SizeOf<alpm_file_t>() * iCount;
+            var byteBuffer = new byte[byteCount];
+            Marshal.Copy(files, byteBuffer, 0, byteBuffer.Length);
+            var result = new alpm_file_t[iCount];
+
+            Buffer.BlockCopy(byteBuffer, 0, result, 0, byteBuffer.Length);
+            return result;
+        }
+    }
+
+    /** Local package or package file backup entry */
+    public struct _alpm_backup_t
+    {
+        string name;
+        string hash;
+    }
+
+    public class alpm_pgpkey_t
+    {
+        public byte[] data;
+        public string fingerprint;
+        public string uid;
+        public string name;
+        public string email;
+        public long created;
+        public long expires;
+        public uint revoked;
+        public char pubkey_algo;
+    }
+
+    public class PgpKeyInMarshaler : ICustomMarshaler
+    {
+        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
+        private class NativePgpKey
+        {
+            public IntPtr data;
+            public string fingerprint;
+            public string uid;
+            public string name;
+            public string email;
+            public long created;
+            public long expires;
+            public uint length;
+            public uint revoked;
+            public char pubkey_algo;
+        }
+
+        public void CleanUpManagedData(object ManagedObj) { }
+        public void CleanUpNativeData(IntPtr pNativeData) { }
+
+        public int GetNativeDataSize()
+        {
+            throw new NotImplementedException();
+        }
+
+        public IntPtr MarshalManagedToNative(object ManagedObj)
+        {
+            throw new NotImplementedException();
+        }
+
+        public object MarshalNativeToManaged(IntPtr pNativeData)
+        {
+            var raw = Marshal.PtrToStructure<NativePgpKey>(pNativeData);
+            var managed = new alpm_pgpkey_t()
+            {
+                data = new byte[raw.length],
+                fingerprint = raw.fingerprint,
+                uid = raw.uid,
+                name = raw.name,
+                email = raw.email,
+                created = raw.created,
+                expires = raw.expires,
+                revoked = raw.revoked,
+                pubkey_algo = raw.pubkey_algo
+            };
+            Marshal.Copy(raw.data, managed.data, 0, (int) raw.length);
+            return managed;
+        }
+    }
+
+    /**
+ * Signature result. Contains the key, status, and validity of a given
+ * signature.
+ */
+    public readonly struct alpm_sigresult_t
+    {
+        [MarshalAs(UnmanagedType.CustomMarshaler, MarshalTypeRef = typeof(PgpKeyInMarshaler))]
+        readonly alpm_pgpkey_t key;
+
+        readonly alpm_sigstatus_t status;
+        readonly alpm_sigvalidity_t validity;
+    }
+
+    /**
+ * Signature list. Contains the number of signatures found and a pointer to an
+ * array of results. The array is of size count.
+ */
+    public class SigListInMarshaler : ICustomMarshaler
+    {
+        public void CleanUpManagedData(object ManagedObj) { }
+        public void CleanUpNativeData(IntPtr pNativeData) { }
+
+        public int GetNativeDataSize()
+        {
+            throw new NotImplementedException();
+        }
+
+        public IntPtr MarshalManagedToNative(object ManagedObj)
+        {
+            throw new NotImplementedException();
+        }
+
+        public object MarshalNativeToManaged(IntPtr pNativeData)
+        {
+            UIntPtr count;
+            IntPtr data;
+            unsafe
+            {
+                count = *(UIntPtr*) pNativeData;
+                data = *(IntPtr*) (pNativeData + sizeof(UIntPtr));
+            }
+
+            var iCount = (int) count;
+            var result = new alpm_sigresult_t[iCount];
+            // NOTE: I expect this to fail cuz i didn't implement the above GetNativeDataSize
+            for (var i = 0; i < iCount; ++i, data += Marshal.SizeOf<alpm_sigresult_t>())
+            {
+                result[i] = Marshal.PtrToStructure<alpm_sigresult_t>(data);
+            }
+
+            return result;
+        }
+    }
+
+
+/*
+ * Hooks
+ */
+
+    enum alpm_hook_when_t
+    {
+        HOOK_PRE_TRANSACTION = 1,
+        HOOK_POST_TRANSACTION
+    }
+
+/*
+ * Logging facilities
+ */
+
+    /** Logging Levels */
+    enum _alpm_loglevel_t
+    {
+        LOG_ERROR = 1,
+        LOG_WARNING = (1 << 1),
+        LOG_DEBUG = (1 << 2),
+        LOG_FUNCTION = (1 << 3)
+    }
+
+    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
+    public struct alpm_pkg_p
+    {
+        private IntPtr ptr;
+    }
+
+    [StructLayout(LayoutKind.Sequential)]
+    public struct alpm_list_t
+    {
+        public IntPtr data;
+        public unsafe alpm_list_t* prev;
+        public unsafe alpm_list_t* next;
+    }
+
+    public interface IAlpmItemsAccessor<TElement>
+    {
+        SafeAlpmHandle Handle { get; }
+        public IntPtr GetItems();
+        public int SetItems(IntPtr list);
+        public int AddItem(TElement item);
+        public int RemoveItem(TElement item);
+        public IntPtr FindItem(TElement item);
+        public TElement PtrToItem(IntPtr p);
+    }
+
+
+    public class SafeAlpmHandle : SafeHandle
+    {
+        private SafeAlpmHandle() : base(IntPtr.Zero, true) { }
+
+        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
+        protected override bool ReleaseHandle()
+        {
+            return alpm.alpm_release(handle) == 0;
+        }
+
+        public override bool IsInvalid => handle == IntPtr.Zero;
+    }
+
+    public sealed class Handle : IDisposable
+    {
+        private readonly SafeAlpmHandle _handle;
+
+        public Handle(string root, string dbpath)
+        {
+            var err = errno_t.ERR_OK;
+            _handle = alpm.alpm_initialize(root, dbpath, ref err);
+            if (_handle.IsInvalid)
+            {
+                throw new Exception(err);
+            }
+        }
+
+        public void Dispose()
+        {
+            _handle.Dispose();
+        }
+
+        private Database DatabaseAccess(IntPtr ptr)
+        {
+            if (ptr == IntPtr.Zero)
+            {
+                throw new Exception(_handle);
+            }
+
+            Database db;
+            RuntimeHelpers.PrepareConstrainedRegions();
+            try { }
+            finally
+            {
+                // adding this ref and getting the Database object the handle must not interrupted
+                var addedRef = false;
+                _handle.DangerousAddRef(ref addedRef);
+                if (!addedRef)
+                    throw new ObjectDisposedException(GetType().FullName);
+                db = new Database(_handle, new DatabaseHandle(ptr));
+            }
+            return db;
+        }
+
+        public Database LocalDB => DatabaseAccess(alpm.alpm_get_localdb(_handle));
+
+        public Database RegisterSyncDB(string treename, SigLevel sigLevel) =>
+            DatabaseAccess(alpm.alpm_register_syncdb(_handle, treename, sigLevel));
+        
+        public readonly struct CacheDirsAccessor : IAlpmItemsAccessor<string>
+        {
+            public CacheDirsAccessor(SafeAlpmHandle handle) => Handle = handle;
+            public SafeAlpmHandle Handle { get; }
+            public IntPtr GetItems() => alpm.alpm_option_get_cachedirs(Handle);
+            public int SetItems(IntPtr list) => alpm.alpm_option_set_cachedirs(Handle, list);
+            public int AddItem(string item) => alpm.alpm_option_add_cachedir(Handle, item);
+            public int RemoveItem(string item) => alpm.alpm_option_remove_cachedir(Handle, item);
+            public IntPtr FindItem(string item) => alpm.alpm_list_find_str(GetItems(), item);
+            public string PtrToItem(IntPtr p) => Marshal.PtrToStringUTF8(p)!;
+        }
+
+        #nullable enable
+        public struct CollectionWrapper<TImpl, TElement> : ICollection<TElement> where TImpl : IAlpmItemsAccessor<TElement>,
+            ICollection<TElement>
+        {
+            private TImpl _impl;
+
+            public CollectionWrapper(TImpl impl)
+            {
+                _impl = impl;
+            }
+
+            IEnumerator<TElement> IEnumerable<TElement>.GetEnumerator()
+            {
+                return (IEnumerator<TElement>) GetEnumerator();
+            }
+
+            public IEnumerator GetEnumerator()
+            {
+                var result = new List<TElement>();
+                var intPtr = _impl.GetItems();
+                unsafe
+                {
+                    for (var list = (alpm_list_t*) intPtr; list != null; list = alpm.alpm_list_next(list))
+                    {
+                        result.Add(_impl.PtrToItem(list->data));
+                    }
+                }
+
+                return result.GetEnumerator();
+            }
+
+
+            public void Add(TElement item)
+            {
+                _impl.AddItem(item);
+            }
+
+            public void Clear()
+            {
+                _impl.SetItems(IntPtr.Zero);
+            }
+
+
+            public bool Contains(TElement item) =>
+                _impl.FindItem(item) != IntPtr.Zero;
+
+            public void CopyTo(TElement[] array, int arrayIndex)
+            {
+                var intPtr = _impl.GetItems();
+                unsafe
+                {
+                    for (var list = (alpm_list_t*) intPtr; list != null; list = alpm.alpm_list_next(list))
+                    {
+                        array[arrayIndex++] = _impl.PtrToItem(list->data);
+                    }
+                }
+            }
+
+            public bool Remove(TElement item)
+            {
+                var err = _impl.RemoveItem(item);
+                if (err < 0)
+                {
+                    throw new Exception(alpm.alpm_errno(_impl.Handle));
+                }
+
+                return err == 0;
+            }
+
+            public int Count => (int) alpm.alpm_list_count(_impl.GetItems());
+            public bool IsReadOnly => false;
+        }
+
+        private readonly struct CacheDirCollection : ICollection<string>
+        {
+            private readonly SafeAlpmHandle _handle;
+
+            public CacheDirCollection(SafeAlpmHandle handle)
+            {
+                _handle = handle;
+            }
+
+            public IEnumerator<string> GetEnumerator()
+            {
+                var result = new List<string>();
+                var intPtr = alpm.alpm_option_get_cachedirs(_handle);
+                unsafe
+                {
+                    for (var list = (alpm_list_t*) intPtr; list != null; list = alpm.alpm_list_next(list))
+                    {
+                        result.Add(Marshal.PtrToStringUTF8(list->data));
+                    }
+                }
+
+                return result.GetEnumerator();
+            }
+
+            IEnumerator IEnumerable.GetEnumerator()
+            {
+                return GetEnumerator();
+            }
+
+            public void Add(string item)
+            {
+                var handle = _handle;
+                Alpm.ErrWrap(_handle, () => alpm.alpm_option_add_cachedir(handle, item));
+            }
+
+            public void Clear()
+            {
+                var handle = _handle;
+                Alpm.ErrWrap(_handle, () => alpm.alpm_option_set_cachedirs(handle, IntPtr.Zero));
+            }
+
+            public bool Contains(string item) =>
+                alpm.alpm_list_find_str(alpm.alpm_option_get_cachedirs(_handle), item) != IntPtr.Zero;
+
+            public void CopyTo(string[] array, int arrayIndex)
+            {
+                var intPtr = alpm.alpm_option_get_cachedirs(_handle);
+                unsafe
+                {
+                    for (var list = (alpm_list_t*) intPtr; list != null; list = alpm.alpm_list_next(list))
+                    {
+                        array[arrayIndex++] = Marshal.PtrToStringUTF8(list->data);
+                    }
+                }
+            }
+
+            public bool Remove(string item)
+            {
+                var err = alpm.alpm_option_remove_cachedir(_handle, item);
+                if (err < 0)
+                {
+                    throw new Exception(alpm.alpm_errno(_handle));
+                }
+
+                return err == 0;
+            }
+
+            public int Count => (int) alpm.alpm_list_count(alpm.alpm_option_get_cachedirs(_handle));
+            public bool IsReadOnly => false;
+        }
+
+        public ICollection<string> CacheDirs
+        {
+            get => new CacheDirCollection(_handle);
+            set
+            {
+                foreach (var s in value)
+                {
+                    Alpm.ErrWrap(_handle, () => alpm.alpm_option_add_cachedir(_handle, s));
+                }
+            }
+        }
+    }
+
+    public enum caps
+    {
+        ALPM_CAPABILITY_NLS = (1 << 0),
+        ALPM_CAPABILITY_DOWNLOADER = (1 << 1),
+        ALPM_CAPABILITY_SIGNATURES = (1 << 2)
+    }
+
+    [Serializable()]
+    public class Exception : System.Exception
+    {
+        public Exception() { }
+        public Exception(SafeAlpmHandle handle) : base(Alpm.StrError(alpm.alpm_errno(handle))) { }
+        public Exception(errno_t errno) : base(Alpm.StrError(errno)) { }
+        public Exception(errno_t errno, System.Exception inner) : base(Alpm.StrError(errno), inner) { }
+
+        protected Exception(SerializationInfo info,
+            StreamingContext context) : base(info, context) { }
+    }
+
+    public class DatabaseHandle : SafeHandle
+    {
+        private DatabaseHandle() : base(IntPtr.Zero, true) { }
+
+        public DatabaseHandle(IntPtr h) : this()
+        {
+            SetHandle(h);
+        }
+
+        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
+        protected override bool ReleaseHandle()
+        {
+            return alpm.alpm_db_unregister(handle) == 0;
+        }
+
+        public override bool IsInvalid => handle == IntPtr.Zero;
+    }
+
+    public sealed class Database : IDisposable
+    {
+        private SafeAlpmHandle _handle;
+        private DatabaseHandle _db;
+
+        public Database(SafeAlpmHandle handle, DatabaseHandle db)
+        {
+            _handle = handle;
+            _db = db;
+        }
+
+        private readonly struct ServerCollection : ICollection<string>
+        {
+            private readonly SafeAlpmHandle _handle;
+            private readonly DatabaseHandle _db;
+
+            public ServerCollection(SafeAlpmHandle handle, DatabaseHandle db)
+            {
+                _handle = handle;
+                _db = db;
+            }
+
+            public IEnumerator<string> GetEnumerator()
+            {
+                var result = new List<string>();
+                var intPtr = alpm.alpm_db_get_servers(_db);
+                unsafe
+                {
+                    for (var list = (alpm_list_t*) intPtr; list != null; list = alpm.alpm_list_next(list))
+                    {
+                        result.Add(Marshal.PtrToStringUTF8(list->data));
+                    }
+                }
+
+                return result.GetEnumerator();
+            }
+
+            IEnumerator IEnumerable.GetEnumerator()
+            {
+                return GetEnumerator();
+            }
+
+            public void Add(string item)
+            {
+                var db = _db;
+                Alpm.ErrWrap(_handle, () => alpm.alpm_db_add_server(db, item));
+            }
+
+            public void Clear()
+            {
+                var db = _db;
+                Alpm.ErrWrap(_handle, () => alpm.alpm_db_set_servers(db, IntPtr.Zero));
+            }
+
+            public bool Contains(string item) =>
+                alpm.alpm_list_find_str(alpm.alpm_db_get_servers(_db), item) != IntPtr.Zero;
+
+            public void CopyTo(string[] array, int arrayIndex)
+            {
+                var intPtr = alpm.alpm_db_get_servers(_db);
+                unsafe
+                {
+                    for (var list = (alpm_list_t*) intPtr; list != null; list = alpm.alpm_list_next(list))
+                    {
+                        array[arrayIndex++] = Marshal.PtrToStringUTF8(list->data);
+                    }
+                }
+            }
+
+            public bool Remove(string item)
+            {
+                var err = alpm.alpm_db_remove_server(_db, item);
+                if (err < 0)
+                {
+                    throw new Exception(alpm.alpm_errno(_handle));
+                }
+
+                return err == 0;
+            }
+
+
+            public int Count => (int) alpm.alpm_list_count(alpm.alpm_db_get_servers(_db));
+            public bool IsReadOnly => false;
+        }
+
+        public ICollection<string> Servers
+        {
+            get => new ServerCollection(_handle, _db);
+            set
+            {
+                foreach (var s in value)
+                {
+                    Alpm.ErrWrap(_handle, () => alpm.alpm_db_add_server(_db, s));
+                }
+            }
+        }
+
+        public string Name => Marshal.PtrToStringUTF8(alpm.alpm_db_get_name(_db));
+
+        public SigLevel SigLevel => alpm.alpm_db_get_siglevel(_db);
+
+        public errno_t Valid => alpm.alpm_db_get_valid(_db) != 0 ? alpm.alpm_errno(_handle) : errno_t.ERR_OK;
+
+        public bool Update(bool force)
+        {
+            var err = alpm.alpm_db_update(force ? 1 : 0, _db);
+            if (err < 0)
+            {
+                throw new Exception(_handle);
+            }
+
+            return err == 0;
+        }
+
+        public void Dispose()
+        {
+            _db.Dispose();
+            RuntimeHelpers.PrepareConstrainedRegions();
+            try { }
+            finally
+            {
+                _handle.DangerousRelease();
+            }
+        }
+    }
+
+
+    public static class alpm
+    {
+        [DllImport(nameof(alpm))]
+        public static extern IntPtr alpm_option_get_cachedirs(SafeAlpmHandle handle);
+
+        [DllImport(nameof(alpm))]
+        public static extern int alpm_option_set_cachedirs(SafeAlpmHandle handle, IntPtr cachedirs);
+
+        [DllImport(nameof(alpm), CharSet = CharSet.Ansi)]
+        public static extern int alpm_option_add_cachedir(SafeAlpmHandle handle, string cachedir);
+
+        [DllImport(nameof(alpm), CharSet = CharSet.Ansi)]
+        public static extern int alpm_option_remove_cachedir(SafeAlpmHandle handle, string cachedir);
+
+        [DllImport(nameof(alpm))]
+        public static extern errno_t alpm_errno(SafeAlpmHandle handle);
+
+        [DllImport(nameof(alpm))]
+        public static extern IntPtr alpm_strerror(errno_t err);
+
+        [DllImport(nameof(alpm))]
+        public static extern IntPtr alpm_get_localdb(SafeAlpmHandle handle);
+
+        [DllImport(nameof(alpm))]
+        public static extern unsafe alpm_list_t* alpm_option_get_syncdbs();
+
+        [DllImport(nameof(alpm), CharSet = CharSet.Ansi)]
+        public static extern IntPtr alpm_register_syncdb(SafeAlpmHandle handle, string treename, SigLevel sigLevel);
+
+        [DllImport(nameof(alpm))]
+        public static extern int alpm_db_unregister_all_syncdbs(SafeAlpmHandle handle);
+
+        [DllImport(nameof(alpm))]
+        public static extern unsafe alpm_list_t* alpm_list_next(alpm_list_t* list);
+
+        [DllImport(nameof(alpm))]
+        public static extern UIntPtr alpm_list_count(IntPtr list);
+
+        [DllImport(nameof(alpm))]
+        public static extern void alpm_list_free(IntPtr list);
+
+        [DllImport(nameof(alpm), CharSet = CharSet.Ansi)]
+        public static extern IntPtr alpm_list_find_str(IntPtr list, string needle);
+
+        [DllImport(nameof(alpm))]
+        public static extern int alpm_unlock(Handle handle);
+
+        [DllImport(nameof(alpm))]
+        public static extern IntPtr alpm_version();
+
+        [DllImport(nameof(alpm))]
+        public static extern caps alpm_capabilities();
+
+        [DllImport(nameof(alpm), CharSet = CharSet.Ansi)]
+        public static extern SafeAlpmHandle alpm_initialize(string root, string dbpath, ref errno_t err);
+
+        [DllImport(nameof(alpm))]
+        public static extern int alpm_release(IntPtr handle);
+
+        [DllImport(nameof(alpm))]
+        public static extern int alpm_db_remove_server(DatabaseHandle db, string url);
+
+        [DllImport(nameof(alpm))]
+        public static extern int alpm_db_unregister(IntPtr db);
+
+        [DllImport(nameof(alpm))]
+        public static extern IntPtr alpm_db_get_name(DatabaseHandle db);
+
+        [DllImport(nameof(alpm))]
+        public static extern SigLevel alpm_db_get_siglevel(DatabaseHandle db);
+
+        [DllImport(nameof(alpm))]
+        public static extern int alpm_db_get_valid(DatabaseHandle db);
+
+        [DllImport(nameof(alpm))]
+        public static extern int alpm_db_update(int force, DatabaseHandle db);
+
+        [DllImport(nameof(alpm))]
+        public static extern IntPtr alpm_db_get_servers(DatabaseHandle db);
+
+        [DllImport(nameof(alpm))]
+        public static extern int alpm_db_set_servers(DatabaseHandle db, IntPtr list);
+
+        [DllImport(nameof(alpm), CharSet = CharSet.Ansi)]
+        public static extern int alpm_db_add_server(DatabaseHandle db, string url);
+    }
+
+    internal static class Alpm
+    {
+        public static string Version()
+        {
+            return Marshal.PtrToStringUTF8(alpm.alpm_version());
+        }
+
+        public static string StrError(errno_t err)
+        {
+            return Marshal.PtrToStringUTF8(alpm.alpm_strerror(err));
+        }
+
+        internal static void ErrWrap(SafeAlpmHandle h, Func<int> f)
+        {
+            var err = f();
+            if (err != 0)
+            {
+                throw new Exception(alpm.alpm_errno(h));
+            }
+        }
+    }
+}

Folder.DotSettings

@@ -0,0 +1,8 @@
+<wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
+	<s:Boolean x:Key="/Default/UserDictionary/Words/=alpm/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/UserDictionary/Words/=libalpm/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/UserDictionary/Words/=siglevel/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/UserDictionary/Words/=strerror/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/UserDictionary/Words/=syncdb/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/UserDictionary/Words/=syncdbs/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/UserDictionary/Words/=treename/@EntryIndexedValue">True</s:Boolean></wpf:ResourceDictionary>

Program.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.Data.Common;
+
+namespace nalpm
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            errno_t err = errno_t.ERR_OK;
+
+            using var h = new Handle("/", "/home/luebsj/db");
+            using var db = h.RegisterSyncDB("jkl-repo", SigLevel.SIG_PACKAGE_OPTIONAL | SigLevel.SIG_USE_DEFAULT);
+
+            db.Servers = new List<string> {"http://a.b.c", "http://d.e.f", "http://arch.johnluebs.com/x86_64"}; 
+            var a = new string[3];
+            db.Servers.CopyTo(a, 0);
+            Console.WriteLine("Hello World! {0} {1} {2}", db.Name, Alpm.Version(),
+                a[0]);
+
+        }
+    }
+}

nalpm.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>