A script to create a git repository for Apple's XNU kernel source.

git-xnu.sh

#! /bin/bash
#
# git-xnu.sh
# Brandon Azad
#
# A script to download Apple's XNU kernel source code and create a git
# repository.
#

XNU_DIR="xnu"

XNU_BASE_URL="https://opensource.apple.com/tarballs/xnu"
XNU_ARCHIVE_EXT=".tar.gz"

# macOS version, Release date, XNU version
XNU_RELEASE_INFO=(
	10.10.5  "Aug 13, 2015"  xnu-2782.40.9

	10.11    "Sep 30, 2015"  xnu-3247.1.106
	10.11.1  "Oct 21, 2015"  xnu-3247.10.11
	10.11.2  "Dec 08, 2015"  xnu-3248.20.55
	10.11.3  "Jan 19, 2016"  xnu-3248.30.4
	10.11.4  "Mar 21, 2016"  xnu-3248.40.184
	10.11.5  "May 16, 2016"  xnu-3248.50.21
	10.11.6  "Jul 18, 2016"  xnu-3248.60.10

	10.12    "Sep 20, 2016"  xnu-3789.1.32
	10.12.1  "Oct 24, 2016"  xnu-3789.21.4
	10.12.2  "Dec 13, 2016"  xnu-3789.31.2
	10.12.3  "Jan 23, 2017"  xnu-3789.41.3
	10.12.4  "Mar 27, 2017"  xnu-3789.51.2
	10.12.5  "May 15, 2017"  xnu-3789.60.24
	10.12.6  "Jul 19, 2017"  xnu-3789.70.16

	10.13    "Sep 25, 2017"  xnu-4570.1.46
	10.13.1  "Oct 31, 2017"  xnu-4570.20.62
	10.13.2  "Dec 06, 2017"  xnu-4570.31.3
	10.13.3  "Jan 23, 2018"  xnu-4570.41.2
	10.13.4  "Mar 29, 2018"  xnu-4570.51.1
	10.13.5  "Jun 01, 2018"  xnu-4570.61.1
	10.13.6  "Jul 09, 2018"  xnu-4570.71.2

	#10.14    "Sep 24, 2018"  xnu-4903.201.2
	10.14.1  "Oct 30, 2018"  xnu-4903.221.2
	10.14.2  "Dec 05, 2018"  xnu-4903.231.4
	10.14.3  "Jan 22, 2019"  xnu-4903.241.1
	#10.14.4  "Mar 25, 2019"  xnu-4903.251.3
	#10.14.5  "Jul 22, 2019"  xnu-4903.261.4

	10.15    "Oct 07, 2019"  xnu-6153.11.26
	)

# The number of releases in XNU_RELEASE_INFO.
XNU_N_RELEASES="${#XNU_RELEASE_INFO[@]}"
XNU_N_RELEASES=$((XNU_N_RELEASES/3))

# Create an XNU download URL from an XNU version.
xnu_download_url() {
	echo "${XNU_BASE_URL}/${1}${XNU_ARCHIVE_EXT}"
}

# Remove superfluous files that shouldn't be included in the repository.
remove_unneeded_files() {
	find . \( -name '.DS_Store' -o -name '*.auto.html' \) -delete -print || :
}

# The git author and committer.
export GIT_AUTHOR_NAME="Apple Open Source"
export GIT_AUTHOR_EMAIL="opensource@apple.com"
export GIT_COMMITTER_NAME="$GIT_AUTHOR_NAME"
export GIT_COMMITTER_EMAIL="$GIT_AUTHOR_EMAIL"

set -e

mkdir -p "${XNU_DIR}"
cd "${XNU_DIR}"
if [ -d .git ]; then
	git checkout master
	SKIPTO_XNUVERS=$(git tag --points-at HEAD | grep 'xnu-')
else
	git init
	SKIPTO_XNUVERS=
fi

NEWL=$'\n'

for ((i=0;i<XNU_N_RELEASES;i++)); do
	OSVERS="${XNU_RELEASE_INFO[$((3*i))]}"
	DATE="${XNU_RELEASE_INFO[$((3*i+1))]}"
	XNUVERS="${XNU_RELEASE_INFO[$((3*i+2))]}"
	# If we're updating an existing repo, skip to the current version.
	if [ -n "$SKIPTO_XNUVERS" ]; then
		if [ "$SKIPTO_XNUVERS" == "$XNUVERS" ]; then
			SKIPTO_XNUVERS=
		fi
		continue
	fi
	FMTDATE="$(date -jRf '%b %d, %Y, %H:%M:%S' "${DATE}, 00:00:00")"
	URL="$(xnu_download_url "${XNUVERS}")"
	printf "%-20s%-12s%-16s%s\n" "${XNUVERS}" "${OSVERS}" "${DATE}" "${URL}"
	# Download and add the new files.
	git rm -rf '*' >/dev/null 2>&1 || :
	curl -sS "${URL}" | tar -xf- --strip-components=1
	remove_unneeded_files
	git add '*' >/dev/null
	# Commit the new files.
	export GIT_COMMITTER_DATE="${FMTDATE}"
	export GIT_AUTHOR_DATE="${GIT_COMMITTER_DATE}"
	git commit -m "${XNUVERS}${NEWL}${NEWL}${URL}" -q
	git tag "${OSVERS}"
	git tag "${XNUVERS}"
done