pyrox.dev
1#!/usr/bin/env bash
2set -euo pipefail
3
4# To update all rt kernels run: ./update-rt.sh
5
6# To update just one ./linux-rt-5.X.nix run: ./update-rt.sh ./linux-rt-5.X.nix
7
8# To add a new kernel branch 5.Y run: ./update-rt.sh ./linux-rt-5.Y.nix
9# (with nonexistent .nix file) and update all-packages.nix.
10
11# To commit run with: env COMMIT=1
12
13mirror=https://kernel.org/pub/linux/kernel
14
15main() {
16 if [ $# -ge 1 ]; then
17 update-if-needed "$1"
18 else
19 update-all-if-needed
20 fi
21}
22
23update-all-if-needed() {
24 for f in "$(dirname "$0")"/linux-rt-*.nix; do
25 update-if-needed "$f"
26 done
27}
28
29file-version() {
30 file="$1" # e.g. ./linux-rt-5.4.nix
31 if [ -e "$file" ]; then
32 grep ' version = ' "$file" | grep -o '[0-9].[^"]*'
33 fi
34}
35
36latest-rt-version() {
37 branch="$1" # e.g. 5.4
38 curl -sL "$mirror/projects/rt/$branch/sha256sums.asc" |
39 sed -ne '/.patch.xz/ { s/.*patch-\(.*\).patch.xz/\1/p}' |
40 grep -v '\-rc' |
41 tail -n 1
42}
43
44update-if-needed() {
45 file="$1" # e.g. ./linux-rt-5.4.nix (created if does not exist)
46 branch=$(basename "$file" .nix) # e.g. linux-rt-5.4
47 branch=${branch#linux-rt-} # e.g. 5.4
48 cur=$(file-version "$file") # e.g. 5.4.59-rt36 or empty
49 new=$(latest-rt-version "$branch") # e.g. 5.4.61-rt37
50 kversion=${new%-*} # e.g. 5.4.61
51 major=${branch%.*} # e.g 5
52 nixattr="linux-rt_${branch/./_}"
53 if [ "$new" = "$cur" ]; then
54 echo "$nixattr: $cur (up-to-date)"
55 return
56 fi
57 khash=$(nix-prefetch-url "$mirror/v${major}.x/linux-${kversion}.tar.xz")
58 phash=$(nix-prefetch-url "$mirror/projects/rt/${branch}/older/patch-${new}.patch.xz")
59 if [ "$cur" ]; then
60 msg="$nixattr: $cur -> $new"
61 else
62 msg="$nixattr: init at $new"
63 prev=$(ls -v "$(dirname "$0")"/linux-rt-*.nix | tail -1)
64 cp "$prev" "$file"
65 cur=$(file-version "$file")
66 fi
67 echo "$msg"
68 sed -i "$file" \
69 -e "s/$cur/$new/" \
70 -e "s|kernel/v[0-9]*|kernel/v$major|" \
71 -e "1,/.patch.xz/ s/sha256 = .*/sha256 = \"$khash\";/" \
72 -e "1,/.patch.xz/! s/sha256 = .*/sha256 = \"$phash\";/"
73 if [ "${COMMIT:-}" ]; then
74 git add "$file"
75 git commit -m "$msg"
76 fi
77}
78
79return 2>/dev/null || main "$@"