Add NSIS installer as final build step

.gitignore

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+Borg-installer
+CygWin
+http*
+ftp*

README.md

@@ -1,22 +1,23 @@
 # borg-cygwin
-Automated installation of [borg backup](https://github.com/borgbackup/borg) under Windows/CygWin
 
-* Create a temporary build folder and place the files from this repository there
-* Download `setup-x86_64.exe` from [CygWin Home Page](https://cygwin.com/setup-x86_64.exe) into build folder
-* Run `install.bat`, after a while you should end up with CygWin installation in `Borg` subfolder
-* To install, copy the `Borg` subfolder into `C:\Program Files\` (this will require Administrator rights)
-* Optionally, add `C:\Program Files\Borg` into your Windows `PATH` variable
-* Delete completely the build folder
+This creates a standard Windows installer for Borg Backup on 64bit Windows 7 and above.
 
-To install into other folder or prepare 32-bit build, edit `install.bat` and use different CygWin setup executable.
+* The only prerequisite is NSIS installed, available at http://nsis.sourceforge.net/Download
+* About 1 GB free disk space required to build installer
+* Borg install itself will only require about 150 MB
+* Tested on Windows 7 64-bit
 
-After installation, use borg like this:
+---
+
+Create the installer by running install.bat. After creating the installer, run it to install Borg.
+
+Then use borg like this, noting that all file paths are in Cygwin notation e.g. /cygdrive/c/path/to/my/files
 
 ```
 borg init /cygdrive/D/Borg
 borg create -C lz4 /cygdrive/D/Borg::Test /cygdrive/C/Photos/
 ```
 
-The install script first builds borg inside temporary CygWin subfolder, then installs much smaller release version into Borg subfolder. Built packages are copied over, unnecessary files removed.
+The install script first builds borg inside temporary CygWin subfolder, then installs a much smaller release version into the Borg-installer subfolder. Built packages are copied over, unnecessary files removed, and then NSIS is run.
 
 Tested with CygWin 2.4.1, borgbackup 1.0.0 on Windows 7 64-bit.

bin/borg-installer-1.0.7.exe.asc

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build-installer.bat

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+REM --- Change to use different CygWin platform and final install path
+
+set CYGSETUP=setup-x86_64.exe
+set TARGETPATH=.
+
+REM --- NSIS must be installed!  Get NSIS from http://nsis.sourceforge.net/Download
+
+set MAKENSIS=C:\Program Files (x86)\NSIS\makensis.exe
+set POWERSHELL=%windir%\System32\WindowsPowerShell\v1.0\powershell.exe
+
+REM --- Fetch Cygwin setup from internet using powershell
+
+"%POWERSHELL%" -Command "(New-Object Net.WebClient).DownloadFile('https://cygwin.com/setup-x86_64.exe', 'setup-x86_64.exe')"
+
+REM --- Install build version of CygWin in a subfolder
+
+set OURPATH=%cd%
+set CYGBUILD=%OURPATH%\CygWin
+set CYGMIRROR=http://mirrors.kernel.org/sourceware/cygwin/
+set BUILDPKGS=python3,python3-devel,python3-setuptools,binutils,gcc-g++,libopenssl,openssl-devel,git,make,openssh,liblz4-devel,liblz4_1
+
+%CYGSETUP% -q -B -o -n -R %CYGBUILD% -L -D -s %CYGMIRROR% -P %BUILDPKGS%
+
+REM --- Build borgbackup
+
+cd %CYGBUILD%
+bin\bash --login -c 'easy_install-3.6 pip'
+bin\bash --login -c 'pip install borgbackup'
+cd %OURPATH%
+
+REM --- Install release version of CygWin in a subfolder
+
+set CYGPATH=%OURPATH%\Borg-installer
+set INSTALLPKGS=python3,openssh,liblz4_1,python3-setuptools
+set REMOVEPKGS=csih,gawk,lynx,man-db,groff,vim-minimal,tzcode,ncurses,info,util-linux
+
+%CYGSETUP% -q -B -o -n -L -R %CYGPATH% -P %INSTALLPKGS% -x %REMOVEPKGS%
+
+REM --- Adjust final CygWin environment
+
+echo @"%TARGETPATH%\bin\bash" --login -c "cd $(cygpath '%cd%'); /bin/borg %%*" >%CYGPATH%\borg.bat
+copy nsswitch.conf %CYGPATH%\etc\
+copy fstab %CYGPATH%\etc\
+
+REM --- Copy built packages into release path
+
+cd %CYGBUILD%
+
+copy bin\borg %CYGPATH%\bin
+for /d %%d in (lib\python3.6\site-packages\borg*) do xcopy /s %%d %CYGPATH%\%%d\
+for /d %%d in (lib\python3.6\site-packages\msgpack*) do xcopy /s %%d %CYGPATH%\%%d\
+for /d %%d in (lib\python3.6\site-packages\pkg_resources) do xcopy /s %%d %CYGPATH%\%%d\
+
+REM --- Remove all locales except EN (borg does not use them)
+
+del /s /q %CYGPATH%\usr\share\locale\
+for /d %%d in (usr\share\locale\en*) do xcopy /s %%d %CYGPATH%\%%d\
+
+REM --- Remove all documentation
+
+del /s /q %CYGPATH%\usr\share\doc\
+del /s /q %CYGPATH%\usr\share\info\
+del /s /q %CYGPATH%\usr\share\man\
+
+REM --- Build Installer using NSIS
+
+cd %OURPATH%
+
+"%MAKENSIS%" nsis-installer.nsi
+

fstab

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+# /etc/fstab
+#
+#    This file is read once by the first process in a Cygwin process tree.
+#    To pick up changes, restart all Cygwin processes.  For a description
+#    see https://cygwin.com/cygwin-ug-net/using.html#mount-table
+
+# BORG INSTALLER: moved drive mount point from /cygdrive to /
+none / cygdrive binary,posix=0,user 0 0