This bash script updates a package version and source hash directly in the source files.
It uses unsafeGetAttrPos to find the files to edit, which in turn require to get access to the real attrset.
This is why we have to define the overlays.
Last active
February 3, 2018 00:14
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Prefetch nix packages and update files in place
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| #!/usr/bin/env nix-shell | |
| #!nix-shell -i bash -p jshon diffutils | |
| set -e | |
| set -o pipefail | |
| main () { | |
| local drvAttr=$1 | |
| local newVersion='"'$2'"' | |
| # Get the old hash _before_ bumping the version. | |
| local oldHash=$(nixVal "$drvAttr.src.outputHash") | |
| if [ "$newVersion" != '""' ]; then | |
| log "Bumping version..." | |
| local oldVersion=$(nixVal "$drvAttr._args.version") | |
| local versionFile=$(nixAttrFile "$drvAttr._args" '"version"') | |
| update "$versionFile" "$oldVersion" "$newVersion" | |
| fi | |
| log "Prefetching source..." | |
| local newHash='"'$(nix-prefetch-url -A "$drvAttr.src")'"' | |
| log "Rewriting hash..." | |
| local hashMethod=$(nixVal "$drvAttr.src.outputHashAlgo") | |
| local hashFile=$(nixAttrFile "$drvAttr.src._args" "$hashMethod") | |
| update "$hashFile" "$oldHash" "$newHash" | |
| } | |
| update () { | |
| local file=$1 old=$2 new=$3 | |
| [ -f "$file" ] || exit 1 | |
| diff -U3 "$file" <(sed -e "s/$old/$new/" "$file") --color || true | |
| sed -e "s/$old/$new/" -i "$file" | |
| } | |
| nixVal () { | |
| local expr=$1; shift | |
| nix-instantiate --eval --strict -E " | |
| #begin:nix | |
| with (import ./. { | |
| overlays = [ (self: super: with super; { | |
| fetchurl = _args: (fetchurl _args) // { inherit _args; }; | |
| stdenv = stdenv // { | |
| mkDerivation = _args: (stdenv.mkDerivation _args) // { inherit _args; }; | |
| }; | |
| })]; | |
| }).pkgs; | |
| #end:nix | |
| $expr" $@ | |
| } | |
| nixAttrFile () { | |
| nixVal "builtins.unsafeGetAttrPos $2 $1" --json | jshon -e file -u | |
| } | |
| log () { echo >&2; echo "$@" >&2; } | |
| # Run the stuff! | |
| main "$@" |
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| ~/projets/nixpkgs$ pkgs/build-support/fetchurl/prefetch.sh cups-filters 1.20.0 | |
| Bumping version... | |
| --- /home/gmaudoux/projets/nixpkgs/pkgs/misc/cups/filters.nix 2018-01-31 17:11:16.448974182 +0100 | |
| +++ /dev/fd/63 2018-01-31 17:18:18.813967126 +0100 | |
| @@ -9,7 +9,7 @@ | |
| in stdenv.mkDerivation rec { | |
| name = "cups-filters-${version}"; | |
| - version = "1.16.0"; | |
| + version = "1.20.0"; | |
| src = fetchurl { | |
| url = "http://openprinting.org/download/cups-filters/${name}.tar.xz"; | |
| Prefetching source... | |
| path is '/nix/store/99hnv30fyc7vgp3aikl37sygf1by28bz-cups-filters-1.20.0.tar.xz' | |
| Rewriting hash... | |
| --- /home/gmaudoux/projets/nixpkgs/pkgs/misc/cups/filters.nix 2018-01-31 17:18:18.819967155 +0100 | |
| +++ /dev/fd/63 2018-01-31 17:18:21.356979118 +0100 | |
| @@ -13,7 +13,7 @@ | |
| src = fetchurl { | |
| url = "http://openprinting.org/download/cups-filters/${name}.tar.xz"; | |
| - sha256 = "1kcndzpbbcaxafnz1wa6acy3p3r5likfqmf057i5q0q6i176lz5k"; | |
| + sha256 = "0g6npicm1cwmxqi6ymfvf9wkplp4z2rzvjjl9v4yfvqdjq85gxnp"; | |
| }; | |
| nativeBuildInputs = [ pkgconfig makeWrapper ]; |
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