python 3.12 cannot run pip<23.1.2 (#4763)

https://stackoverflow.com/questions/77364550/attributeerror-module-pkgutil-has-no-attribute-impimporter-did-you-mean

projects/pip.pypa.io/README.md

@@ -0,0 +1,5 @@
+# fit & finish
+
+* we provide all `pip3.x` (that we could build) that automatically invoke
+  pip via that python
+* if a pkgx python is already in the environment, that python is used

projects/pip.pypa.io/package.yml

@@ -12,34 +12,52 @@ dependencies:
 
 build:
   dependencies:
+    python.org: ~3.11
     crates.io/semverator: ^0.4.3
   script:
   - pkgx curl -O https://bootstrap.pypa.io/get-pip.py
 
-  # build a pip for every python
-  # FIXME hardcoding 3.12 sucks
-  # FIXME 3.7 *should* work but doesn't
-  - run:
-      - v=3.7
-      - while semverator lt $v 3.12; do
-      -   v=$(semverator bump $v minor | cut -d. -f1,2)
-
   - rm -rf bootstrap && mkdir bootstrap
-      -   pkgx python@$v get-pip.py --target=bootstrap
+  - python get-pip.py --target=bootstrap
 
   - PYTHONPATH=$PWD/bootstrap
-            pkgx python@$v -m pip install .
-              --target={{prefix}}/py$v
+      python -m pip install .
+        --target={{prefix}}/libexec
+
+  - run:
+      # FIXME 3.7 *should* work but doesn't
+      - v=3.7
+
+      # Python 3.12 had various breaking changes (semver is meaningless
+      # apparently) and thus pip less than 23.1.2 will not work with it
+      # FIXME hardcoding 3.12 sucks
+      - |
+        if semverator lt {{version}} 23.1.2; then
+          vMax=3.11
+        else
+          vMax=3.12
+        fi
+
+      - while semverator lt $v $vMax; do
+      -   v=$(semverator bump $v minor | cut -d. -f1,2)
+
       - |
           install -D $PROP {{prefix}}/bin/pip$v
-          sed -i s/{{v}}/$v/ {{prefix}}/bin/pip$v
           echo "exec pkgx python@$v \"\$d/bin/pip\" \"\$@\"" >> {{prefix}}/bin/pip$v
-
-      -   vMax=$v
       - done
+
+      # FIXME hardcoded `3`
+      - |
+        install -D $PROP {{prefix}}/bin/pip3
+        echo "exec pkgx python@3 \"\$d/bin/pip\" \"\$@\"" >> {{prefix}}/bin/pip3
+
+      - |
+        install -D $PROP {{prefix}}/bin/pip
+        echo "exec pkgx python \"\$d/bin/pip\" \"\$@\"" >> {{prefix}}/bin/pip
+
     prop: |
       #!/bin/sh
-      d="$(cd "$(dirname "$0")"/.. && pwd)/py{{v}}"
+      d="$(cd "$(dirname "$0")"/.. && pwd)/libexec"
       export PIP_DISABLE_PIP_VERSION_CHECK=1
       if [ -n "$PYTHONPATH" ]; then
         export PYTHONPATH="$d:$PYTHONPATH"
@@ -47,14 +65,10 @@ build:
         export PYTHONPATH="$d"
       fi
 
-  # FIXME hardcoded `3`
-  - run: |
-      ln -s pip$vMax pip3
-      ln -s pip$vMax pip
-    working-directory:
-      ${{prefix}}/bin
+  # cleanup unused files
+  - rm {{prefix}}/libexec/bin/pip?*
 
-  - fix-shebangs.ts {{prefix}}/py*/bin/*
+  - fix-shebangs.ts {{prefix}}/libexec/bin/*
 
 test:
   - run: pkgx +python.org~3.9 pip install findtui --target .
@@ -69,6 +83,16 @@ test:
   - pip --version | grep {{prefix}}
   - pip --version | grep {{version}}
 
+  - |
+    for v in 3.8 3.9 3.10 3.11; do
+      test $(pip$v inspect | pkgx jq --raw-output .environment.python_version) = $v
+    done
+
 provides:
   - bin/pip
+  - bin/pip3.8
+  - bin/pip3.9
+  - bin/pip3.10
+  - bin/pip3.11
+  - bin/pip3.12
 #FIXME  - bin/pip{{deps.python.org.version.major}}