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+#!/bin/sh
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+#
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+# msys2-sshd-setup.sh — configure sshd on MSYS2 and run it as a Windows service
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+#
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+# Replaces ssh-host-config <https://github.com/openssh/openssh-portable/blob/master/contrib/cygwin/ssh-host-config>
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+# Adapted from <https://ghc.haskell.org/trac/ghc/wiki/Building/Windows/SSHD> by Sam Hocevar <sam@hocevar.net>
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+# Adapted from <https://gist.github.com/samhocevar/00eec26d9e9988d080ac> by David Macek
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+#
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+# Prerequisites:
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+# - pacman -S openssh cygrunsrv
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+#
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+#
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+# Adapted by the MMGen Project from https://www.msys2.org/wiki/Setting-up-SSHd/
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+#
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+# MMGen notes:
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+# Open PowerShell (Run as Administrator)
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+# system32> net user administrator /active:yes
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+# system32> C:\\msys64\usr\bin\bash.exe --login
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+# $ path/to/msys2-sshd-setup.sh
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+#
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+# Now the SSH service should start automatically when Windows is rebooted.
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+# You can manually start and stop the service by running:
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+# net start msys2_sshd
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+# net stop msys2_sshd
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+
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+set -e
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+
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+# Configuration
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+UNPRIV_USER=sshd # DO NOT CHANGE; this username is hardcoded in the openssh code
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+UNPRIV_NAME="Privilege separation user for sshd"
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+EMPTY_DIR=/var/empty
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+
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+# Check installation sanity
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+if ! cygrunsrv -v >/dev/null; then
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+ echo "ERROR: Missing 'cygrunsrv'. Try: pacman -S cygrunsrv."
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+ exit 1
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+fi
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+
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+if ! ssh-keygen -A; then
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+ echo "ERROR: Missing 'ssh-keygen'. Try: pacman -S openssh."
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+ exit 1
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+fi
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+
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+# The unprivileged sshd user (for privilege separation)
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+add="$(if ! net user "${UNPRIV_USER}" >/dev/null; then echo "//add"; fi)"
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+if ! net user "${UNPRIV_USER}" ${add} //fullname:"${UNPRIV_NAME}" \
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+ //homedir:"$(cygpath -w ${EMPTY_DIR})" //active:no; then
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+ echo "ERROR: Unable to create Windows user ${UNPRIV_USER}"
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+ exit 1
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+fi
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+
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+# Add or update /etc/passwd entries
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+if test -f /etc/passwd; then
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+ sed -i -e '/^'"${UNPRIV_USER}"':/d' /etc/passwd
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+ SED='/^'"${UNPRIV_USER}"':/s?^\(\([^:]*:\)\{5\}\).*?\1'"${EMPTY_DIR}"':/bin/false?p'
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+ mkpasswd -l -u "${UNPRIV_USER}" | sed -e 's/^[^:]*+//' | sed -ne "${SED}" >> /etc/passwd
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+ mkgroup.exe -l > /etc/group
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+fi
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+
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+# Finally, register service with cygrunsrv and start it
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+cygrunsrv -R msys2_sshd || true
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+cygrunsrv -I msys2_sshd -d "MSYS2 sshd" -p /usr/bin/sshd.exe -a "-D -e" -y tcpip
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