Configures the `--cache-dir` parameter for the prune and check commands run after backing up. For `check`, also adds a `checkOpts` flag to enable using the cache, since that is disabled by default.
this is just a hook so its safe
without this change:
we build a python3 for buildHost twice instead of only once while the result
of the build is the same
```
nix-repl> pkgsCross.aarch64-multiplatform.python3.pythonForBuild
«derivation /nix/store/5sx1ng86lxzggi33rchvq0z16ywkg11b-python3-3.10.7.drv»
nix-repl> pkgsCross.aarch64-multiplatform.buildPackages.python3
«derivation /nix/store/c5rlaqdfymd3j5v41rh98pjcv3dx3sh7-python3-3.10.7.drv»
```
```
$ nix-diff $(getOutForDrv "/nix/store/5sx1ng86lxzggi33rchvq0z16ywkg11b-python3-3.10.7.drv") $(getOutForDrv "/nix/store/c5rlaqdfymd3j5v41rh98pjcv3dx3sh7-python3-3.10.7.drv") --environment
- /nix/store/3fkwg2pypsxhydgwb9m7f1v5pcgfns6p-python3-3.10.7:{out}
+ /nix/store/wyhbl43ycqn43d08v5fqj1j6ynf7nz73-python3-3.10.7:{out}
• The input derivation named `python-setup-hook.sh` differs
- /nix/store/slvn39rh0l53c9czaf3g6a4awcj63j5r-python-setup-hook.sh.drv:{out}
+ /nix/store/bcjff6dn4gp7pf0knnja9ax4qrll78d5-python-setup-hook.sh.drv:{out}
• The set of input source names do not match:
- cross-file.conf
• The input derivation named `stdenv-linux` differs
- /nix/store/rsxsipgabvny0mc286j3vfpgaaaixdyz-stdenv-linux.drv:{out}
+ /nix/store/46ywpk0p6r22y502gi21xxghminy9lbj-stdenv-linux.drv:{out}
• The set of input derivation names do not match:
- hook
+ acl-2.3.1
+ attr-2.5.1
+ binutils-2.39
+ binutils-wrapper-2.39
+ ed-1.18
+ expand-response-params
+ gcc-11.3.0
+ gcc-wrapper-11.3.0
+ glibc-2.35-163
+ gmp-with-cxx-stage4-6.2.1
+ libidn2-2.3.2
+ libunistring-1.0
+ linux-headers-5.19
+ pcre-8.45
+ zlib-1.2.12
• The set of input derivations named `bzip2-1.0.8` do not match
• The set of input derivations named `xz-5.2.6` do not match
• The environments do not match:
+ allowedRequisites=...
defaultNativeBuildInputs=''
...
''
• The environments do not match:
cmakeFlags=''
-DCMAKE_SYSTEM_NAME=Linux -DCMAKE_SYSTEM_PROCESSOR=aarch64 -DCMAKE_HOST_SYSTEM_NAME=Linux -DCMAKE_HOST_SYSTEM_PROCESSOR=x86_64
''
configureFlags=''
--build=x86_64-unknown-linux-gnu --host=aarch64-unknown-linux-gnu
''
mesonFlags=''
--cross-file=/nix/store/0d6bflf42rgrrxhp10visp67scqncd4g-cross-file.conf
''
stdenv=''
/nix/store/6ji09gqw12pnp3ylw3rrsd65f9vhhx89-stdenv-linux/nix/store/ykjm8yzjcwg2xpf640zh6jql5s8yimkp-stdenv-linux
''
• The environments do not match:
setupHook=''
/nix/store/x6rrxsai11kl9gq29ipv0jn455admav3-python-setup-hook.sh/nix/store/h7z4wvlf7n23ir86nngjn9rpk1ygc7di-python-setup-hook.sh
''
```
