AppVeyor CI configuration using Cygwin.

This also serves nicely as documentation of the Cygwin build
requirements.

appveyor.sh

@@ -0,0 +1,70 @@
+#!/bin/sh
+#
+# Cleanup for Appveyor peculiarities.
+#
+# This thing is dangerous.  See "rm -rf *".  It tries hard, but if it
+# gets it wrong you will not be happy.
+#
+# Only run this on an Appveyor instance, where the consequences are
+# nil.
+#
+
+# Echo, eval, and error on shell commands.
+eeval()
+{
+    echo "$0: $*" >&2
+    eval "$@"
+    rv=$?
+    if [ $rv -ne 0 ]; then
+	echo "$0: failed, exitcod $rv"
+	exit $rv
+    fi
+    return 0
+}
+
+# We inherit a broken Windows path with a Windows Git.
+PATH=/bin
+
+# This supposedly fixes some failures.
+exec 0</dev/null
+
+# Mosh-specific environment
+export LANG=en_US.UTF-8
+
+# Make sure we're on Appveyor
+if [ -z "$APPVEYOR_BUILD_FOLDER" ]; then
+    echo "$0: APPVEYOR_BUILD_FOLDER variable empty" >&2
+    exit 2
+fi
+
+# Make really, really sure we're in the build dir
+cd $APPVEYOR_BUILD_FOLDER || exit 2
+if [ "$(pwd)" = "$HOME" -o "$PWD" = "$HOME" ]; then
+    echo "$0: in home directory" >&2
+    exit 2
+fi
+
+set -e
+
+case $1 in
+    before_build)
+	# Check that we're in a Mosh repo with mosh-1.2.5, then clean it mercilessly
+	eeval git config --local core.symlinks true
+	eeval "git describe 3c3b356cb5e387887499beb2eedddce185f36944 && rm -rf * && git reset --hard"
+	;;
+    build_script)
+	eeval ./autogen.sh
+	eeval ./configure --enable-compile-warnings=error --enable-examples
+	eeval make distcheck VERBOSE=1 V=1
+	;;
+    wait)
+	touch wait.lck
+	while [ -f wait.lck ]; do
+	    sleep 10
+	done
+	;;
+    *)
+	echo "Fail: $0 $*"
+	exit 2
+	;;
+esac

appveyor.yml

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+#
+# Appveyor configuration file for CI build of Mosh on Windows (under Cygwin)
+#
+# For further details see http://www.appveyor.com
+#
+
+#
+# Custom environment variables
+#
+environment:
+    global:
+        CYG_ROOT: C:\cygwin64
+        CYG_MIRROR: http://cygwin.mirror.constant.com
+        CYG_CACHE: C:\cygwin64\var\cache\setup
+        CYG_BASH: C:\cygwin64\bin\bash
+
+cache:
+  - '%CYG_CACHE%'
+
+#
+# Do a shallow clone of the repo to speed up build
+#
+# clone_depth: 1
+
+# Initialisation prior to pulling the repository
+# Attempt to ensure we don't try to convert line endings to Win32 CRLF as this will cause build to fail
+init:
+    # - ps: $blockRdp = $true; iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/appveyor/ci/master/scripts/enable-rdp.ps1'))
+    - git config --global core.autocrlf input
+#
+# Install needed build dependencies
+# 
+install:
+    - '%CYG_ROOT%\setup-x86_64.exe --quiet-mode --no-shortcuts --packages autoconf,autogen,automake,cygwin-devel,git,gcc-core,gcc-g++,libncurses-devel,libprotobuf-devel,make,openssh,openssl-devel,perl,pkg-config,tmux,zlib-devel'
+    - '%CYG_ROOT%\bin\cygcheck -dc cygwin'
+
+#
+# Mosh uses symlinks and other Unixisms in the work dir.  Fix by replacing it with a Cygwin checkout.
+#
+before_build:
+    - '%CYG_BASH% -lc "cd $APPVEYOR_BUILD_FOLDER && ./appveyor.sh before_build"'
+
+
+# Build and test, actually.
+build_script:
+    - 'echo Building...'
+    - '%CYG_BASH% -lc "cd $APPVEYOR_BUILD_FOLDER && ./appveyor.sh build_script"'
+#
+# Disable tests for now
+# 
+test: off
+
+# on_finish:
+#     - '%CYG_BASH% -lc "cd $APPVEYOR_BUILD_FOLDER && ./appveyor.sh wait"'