Initial Travis-CI YML and build script for CentOS 7.

.travis.yml

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+if: tag IS present
+os: linux
+dist: bionic
+language: shell
+addons:
+  apt:
+    packages:
+      - qemu-utils
+script:
+  - chmod +x ./build.sh
+  - ./build.sh
+deploy:
+  provider: releases
+  edge: true
+  token:
+    secure: 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
+  file: 'wsl/dist/*.zip'
+  on:
+    repo: mishamosher/CentOS-WSL
+    tags: true
+    all_branches: true

build.sh

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+#!/bin/bash
+
+# Environment variables for the CentOS cloud image
+ARCH="x86_64"
+OS_VER="7"
+ROOTFS_VER="2003"
+ROOTFS_FN="CentOS-${OS_VER}-${ARCH}-GenericCloud-${ROOTFS_VER}.qcow2"
+ROOTFS_URL="http://cloud.centos.org/centos/${OS_VER}/images/${ROOTFS_FN}"
+
+# Environment variables for Yuk7's wsldl
+LNCR_BLD="20040300"
+LNCR_ZIP="icons.zip"
+LNCR_NAME="CentOS"
+LNCR_FN=${LNCR_NAME}.exe
+LNCR_ZIPFN=${LNCR_NAME}${OS_VER}.exe
+LNCR_URL="https://github.com/yuk7/wsldl/releases/download/${LNCR_BLD}/${LNCR_ZIP}"
+
+# Waits until a file appears or disappears
+# - $1   File path to wait for its existence
+# - [$2] The string 'a' to wait until the file appears, or 'd' to wait until the file disappears
+# - [$3] Timeout in seconds
+waitFile() {
+  local START=$(cut -d '.' -f 1 /proc/uptime)
+  local MODE=${2:-"a"}
+  until [[ "${MODE}" = "a" && -e "$1" ]] || [[ "${MODE}" = "d" && ( ! -e "$1" ) ]]; do
+    sleep 1s
+    if [ -n "$3" ]; then
+      local NOW=$(cut -d '.' -f 1 /proc/uptime)
+      local ELAPSED=$(( NOW - START ))
+      if [ $ELAPSED -ge "$3" ]; then break; fi
+    fi
+  done
+}
+
+# Create a work dir
+mkdir wsl
+cd wsl
+
+# Download the CentOS cloud image and Yuk7's WSLDL
+wget --no-verbose ${ROOTFS_URL} -O ${ROOTFS_FN}
+wget --no-verbose ${LNCR_URL} -O ${LNCR_ZIP}
+
+# Extract the CentOS WSL launcher
+unzip ${LNCR_ZIP} ${LNCR_FN}
+
+# Clean up
+rm ${LNCR_ZIP}
+
+# Mount the qcow2 image
+sudo mkdir mntfs
+sudo modprobe nbd
+sudo qemu-nbd -c /dev/nbd0 --read-only ./${ROOTFS_FN}
+waitFile /dev/nbd0p1 "a" 30
+sudo mount -o ro /dev/nbd0p1 mntfs
+
+# Clone the qcow2 image contents to a writable directory
+sudo cp -a mntfs rootfs
+
+# Unmount the qcow2 image
+sudo umount mntfs
+sudo qemu-nbd -d /dev/nbd0
+waitFile /dev/nbd0p1 "d" 30
+sudo rmmod nbd
+sudo rmdir mntfs
+
+# Clean up
+rm ${ROOTFS_FN}
+
+# Create a tar.gz of the rootfs
+sudo tar -zcpf rootfs.tar.gz -C ./rootfs .
+sudo chown "$(id -un)" rootfs.tar.gz
+
+# Clean up
+sudo rm -rf rootfs
+
+# Create the distribution zip of WSL CentOS
+mkdir out
+mkdir dist
+mv -f ${LNCR_FN} ./out/${LNCR_ZIPFN}
+mv -f rootfs.tar.gz ./out/
+pushd out
+zip -r ../dist/CentOS${OS_VER}.zip ./*
+popd
+
+# Clean up
+rm -rf out