bug#42009: package.cache not deterministic

[Ludovic Courtès]

Hi,

Ludovic Courtès <ludo@gnu.org> skribis:

> But it’s not quite right because the order in which variables are
> traversed is still non-deterministic, so between two runs of
> ‘generate-package-cache’, caches differ like this:
>
> --- a 2020-06-29 14:27:32.291028456 +0200
> +++ b 2020-06-29 14:27:37.930993059 +0200
> @@ -8581,7 +8581,7 @@
>   #("clang-runtime"
>     "9.0.1"
>     (gnu packages llvm)
> -   clang-runtime
> +   clang-runtime-9
>     ("out")
>     #t
>     #f
> @@ -26511,7 +26511,7 @@
>   #("gcc-objc++"
>     "7.5.0"
>     (gnu packages gcc)
> -   gcc-objc++-7
> +   gcc-objc++
>     ("out" "lib" "debug")
>     #t
>     #f
> @@ -26641,7 +26641,7 @@
>   #("gcc-toolchain"
>     "7.5.0"
>     (gnu packages commencement)
> -   gcc-toolchain
> +   gcc-toolchain-7
>     ("out" "debug" "static")
>     #t
>     #f
> @@ -33311,7 +33311,7 @@
>   #("ghc"
>     "8.6.5"
>     (gnu packages haskell)
> -   ghc-8.6
> +   ghc-8
>     ("out" "doc")
>     #t
>     #f
> @@ -41876,7 +41876,7 @@
>   #("icedtea"
>     "3.7.0"
>     (gnu packages java)
> -   icedtea-8
> +   icedtea
>     ("out" "jdk" "doc")
>     #t
>     #f
> @@ -54376,7 +54376,7 @@
>   #("linux-libre-headers"
>     "5.4.20"
>     (gnu packages linux)
> -   linux-libre-headers-5.4.20
> +   linux-libre-headers
>     ("out")
>     #t
>     #f
> @@ -54636,7 +54636,7 @@
>   #("llvm"
>     "9.0.1"
>     (gnu packages llvm)
> -   llvm-9
> +   llvm
>     ("out" "opt-viewer")
>     #t
>     #f
> @@ -61826,7 +61826,7 @@
>   #("ocaml"
>     "4.09.0"
>     (gnu packages ocaml)
> -   ocaml
> +   ocaml-4.09
>     ("out")
>     #t
>     #f
> @@ -62256,7 +62256,7 @@
>   #("opencl-headers"
>     "2.2.0-0.e986688"
>     (gnu packages opencl)
> -   opencl-headers
> +   opencl-headers-2.2
>     ("out")
>     #t
>     #f
> @@ -92636,7 +92636,7 @@
>   #("python2"
>     "2.7.17"
>     (gnu packages python)
> -   python-2
> +   python-2.7
>     ("out" "tk")
>     #t
>     #f
> @@ -92646,7 +92646,7 @@
>   #("python"
>     "3.8.2"
>     (gnu packages python)
> -   python-3
> +   python
>     ("out" "tk")
>     #t
>     #f
> @@ -123676,7 +123676,7 @@
>   #("rust"
>     "1.39.0"
>     (gnu packages rust)
> -   rust-1.39
> +   rust
>     ("out" "doc" "cargo")
>     #t
>     #f
>
>
> The problem has to do with aliases: we don’t always see the same
> variable first.  So we have to sort before calling ‘expand-cache’.

Fixed in a127e52f601ee73f675d5d28eac2388bb1ad11b0!

Ludo’.