tjh.dev
1#!/usr/bin/env nix-shell
2#!nix-shell --packages curl
3#!nix-shell --packages jq
4#!nix-shell --packages parallel
5#!nix-shell -i bash
6
7# Exit immediately if a command exits with a non-zero status.
8# Exit when a producer fails in a pipe
9# Treat undefined variable references as errors
10set -e -o pipefail -u
11
12# Check if working directory is (probably) right
13test "./update" = $0 || {
14 echo "The working directory ought to be the same is the update script location. Please invoke as ./update" 1>&2
15 exit 1
16}
17
18# Create temporary directory with automatic cleanup
19readonly MY_TMP="$(mktemp -d)"
20cleanup () {
21 rm -rf "$MY_TMP"
22}
23trap cleanup EXIT
24
25# stdout: file containing release info and a convenient placeholder
26# for the sha256 attribute
27getRelease () {
28 local owner="$1"
29 local repo="$2"
30 local out="$MY_TMP/$owner--$repo-release"
31 curl -fSs https://api.github.com/repos/"$owner"/"$repo"/releases/latest \
32 | jq '{ version: .name, url: .tarball_url, sha256: "__SHA256__" }' \
33 > "$out"
34 echo "$out"
35}
36
37# 'getters' for the release info file
38
39# stdout: unquoted tarball url
40releaseUrl () {
41 local file="$1"
42 jq -r '.url' <"$file"
43}
44
45# stdout: unquoted version
46releaseVersion () {
47 local file="$1"
48 jq -r '.version' <"$file"
49}
50
51# Fetch release tarball and compute hash
52# stdout: base32 sha256 to be used in fetchurl
53getReleaseHash () {
54 local file="$1"
55 local name="$2"
56 nix-prefetch-url "$(releaseUrl "$file")" --name "$name-$(releaseVersion "$file").tar.gz"
57}
58
59# Write a release info file to release-info/$owner-$repo.json
60updateRelease () {
61 local owner="$1"
62 local repo="$2"
63 local r="$(getRelease "$owner" "$repo")"
64 local hash="$(getReleaseHash "$r" "$repo")"
65 sed \
66 -e s/__SHA256__/"$hash"/\
67 <"$r" \
68 >"release-info/$owner-$repo.json"
69}
70
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