pkgs/build-support/fetchhg/nix-prefetch-hg

   1 #! /usr/bin/env bash
   2 set -e
   3
   4 url=$1
   5 rev=$2
   6 expHash=$3
   7
   8 hashType="${NIX_HASH_ALGO:-sha256}"
   9 hashFormat=${hashFormat:-"--base32"}
  10 rev="${rev:-tip}"
  11
  12 LOG() {
  13   echo "$@" >&2
  14 }
  15
  16 die() {
  17   LOG "$@"
  18   exit 1
  19 }
  20
  21 if [[ -z "$url" || "$url" == "--help" ]]; then
  22     die "Usage: nix-prefetch-hg URL [rev [EXPECTED-HASH]]"
  23 fi
  24
  25 if [[ "${fetchSubrepos:-0}" == 1 ]]; then
  26     subrepoClause=S
  27 else
  28     subrepoClause=
  29 fi
  30
  31 # If the hash was given, a file with that hash may already be in the
  32 # store.
  33 if [[ -n "$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="$expHash"
  39 fi
  40
  41
  42 # If we don't know the hash or a path with that hash doesn't exist,
  43 # download the file and add it to the store.
  44 if [[ -z "$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
  76 fi
  77
  78 if [[ -z "$QUIET" ]]; then LOG "path is $finalPath"; fi
  79
  80 echo "$hash"
  81
  82 if [[ -n "$PRINT_PATH" ]]; then
  83     echo "$finalPath"
  84 fi