tjh.dev
nixpkgs mirror (for testing)
github.com/NixOS/nixpkgs
nix
1#! /usr/bin/env bash
2set -e
3
4url=$1
5rev=$2
6expHash=$3
7
8hashType="${NIX_HASH_ALGO:-sha256}"
9hashFormat=${hashFormat:-"--base32"}
10rev="${rev:-tip}"
11
12LOG() {
13 echo "$@" >&2
14}
15
16die() {
17 LOG "$@"
18 exit 1
19}
20
21if [[ -z "$url" || "$url" == "--help" ]]; then
22 die "Usage: nix-prefetch-hg URL [rev [EXPECTED-HASH]]"
23fi
24
25if [[ "${fetchSubrepos:-0}" == 1 ]]; then
26 subrepoClause=S
27else
28 subrepoClause=
29fi
30
31# If the hash was given, a file with that hash may already be in the
32# store.
33if [[ -n "$expHash" ]]; then
34 finalPath=$(nix-store --print-fixed-path --recursive "$hashType" "$expHash" hg-archive)
35 if ! nix-store --check-validity "$finalPath" 2> /dev/null; then
36 finalPath=
37 fi
38 hash="$expHash"
39fi
40
41
42# If we don't know the hash or a path with that hash doesn't exist,
43# download the file and add it to the store.
44if [[ -z "$finalPath" ]]; then
45 # nix>=2.20 rejects adding symlinked paths to the store, so use realpath
46 # to resolve to a physical path. https://github.com/NixOS/nix/issues/11941
47 tmpPath="$(realpath "$(mktemp -d --tmpdir hg-checkout-tmp-XXXXXXXX)")"
48 cleanup() { x=$?; rm -rf "$tmpPath"; exit $x; }; trap cleanup EXIT
49
50 tmpArchive="$tmpPath/hg-archive"
51
52 # Perform the checkout.
53 if [[ "$url" != /* ]]; then
54 tmpClone="$tmpPath/hg-clone"
55 hg clone -q -y -U "$url" "$tmpClone" >&2
56 else
57 tmpClone=$url
58 fi
59 hg archive -q$subrepoClause -y -r "$rev" --cwd "$tmpClone" "$tmpArchive"
60 rm -f "$tmpArchive/.hg_archival.txt"
61
62 LOG "hg revision is $(cd "$tmpClone"; hg id -r "$rev" -i)"
63
64 # Compute the hash.
65 hash=$(nix-hash --type "$hashType" "$hashFormat" "$tmpArchive")
66 if [[ -z "$QUIET" ]]; then LOG "hash is $hash"; fi
67
68 # Add the downloaded file to the Nix store.
69 finalPath=$(nix-store --add-fixed --recursive "$hashType" "$tmpArchive")
70
71 if [[ -n "$expHash" && "$expHash" != "$hash" ]]; then
72 die "ERROR: hash mismatch for URL \`$url'"
73 fi
74
75
76fi
77
78if [[ -z "$QUIET" ]]; then LOG "path is $finalPath"; fi
79
80echo "$hash"
81
82if [[ -n "$PRINT_PATH" ]]; then
83 echo "$finalPath"
84fi