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#!/usr/bin/env bash
set -euo pipefail
# To update all rt kernels run: ./update-rt.sh
# To update just one ./linux-rt-5.X.nix run: ./update-rt.sh ./linux-rt-5.X.nix
# To add a new kernel branch 5.Y run: ./update-rt.sh ./linux-rt-5.Y.nix
# (with nonexistent .nix file) and update all-packages.nix.
# To commit run with: env COMMIT=1
mirror=https://kernel.org/pub/linux/kernel
main() {
if [ $# -ge 1 ]; then
update-if-needed "$1"
else
update-all-if-needed
fi
}
update-all-if-needed() {
for f in "$(dirname "$0")"/linux-rt-*.nix; do
update-if-needed "$f"
done
}
file-version() {
file="$1" # e.g. ./linux-rt-5.4.nix
if [ -e "$file" ]; then
grep ' version = ' "$file" | grep -o '[0-9].[^"]*'
fi
}
latest-rt-version() {
branch="$1" # e.g. 5.4
curl -sL "$mirror/projects/rt/$branch/sha256sums.asc" |
sed -ne '/.patch.xz/ { s/.*patch-\(.*\).patch.xz/\1/p}' |
grep -v '\-rc' |
sort --version-sort |
tail -n 1
}
update-if-needed() {
file="$1" # e.g. ./linux-rt-5.4.nix (created if does not exist)
branch=$(basename "$file" .nix) # e.g. linux-rt-5.4
branch=${branch#linux-rt-} # e.g. 5.4
cur=$(file-version "$file") # e.g. 5.4.59-rt36 or empty
new=$(latest-rt-version "$branch") # e.g. 5.4.61-rt37
kversion=${new%-*} # e.g. 5.4.61
major=${branch%.*} # e.g 5
nixattr="linux-rt_${branch/./_}"
if [ "$new" = "$cur" ]; then
echo "$nixattr: $cur (up-to-date)"
return
fi
khash=$(nix-prefetch-url "$mirror/v${major}.x/linux-${kversion}.tar.xz")
phash=$(nix-prefetch-url "$mirror/projects/rt/${branch}/older/patch-${new}.patch.xz")
if [ "$cur" ]; then
msg="$nixattr: $cur -> $new"
else
msg="$nixattr: init at $new"
prev=$(ls -v "$(dirname "$0")"/linux-rt-*.nix | tail -1)
cp "$prev" "$file"
cur=$(file-version "$file")
fi
echo "$msg"
sed -i "$file" \
-e "s/$cur/$new/" \
-e "s|kernel/v[0-9]*|kernel/v$major|" \
-e "1,/.patch.xz/ s/sha256 = .*/sha256 = \"$khash\";/" \
-e "1,/.patch.xz/! s/sha256 = .*/sha256 = \"$phash\";/"
if [ "${COMMIT:-}" ]; then
git add "$file"
git commit -m "$msg"
fi
}
return 2>/dev/null || main "$@"
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