fix(python): set pyvenv python home

Signed-off-by: Ettore Di Giacinto <[email protected]>

Author: mudler

backend/python/common/libbackend.sh

@@ -237,6 +237,7 @@ function getBuildProfile() {
 # Make the venv relocatable:
 # - rewrite venv/bin/python{,3} to relative symlinks into $(_portable_dir)
 # - normalize entrypoint shebangs to /usr/bin/env python3
+# - update pyvenv.cfg to point to the portable Python directory
 _makeVenvPortable() {
     local venv_dir="${EDIR}/venv"
     local vbin="${venv_dir}/bin"
@@ -255,7 +256,37 @@ _makeVenvPortable() {
     ln -s "${rel_py}" "${vbin}/python3"
     ln -s "python3" "${vbin}/python"
 
-    # 2) Rewrite shebangs of entry points to use env, so the venv is relocatable
+    # 2) Update pyvenv.cfg to point to the portable Python directory
+    #    Use absolute path resolved at runtime so it works when the venv is copied
+    local pyvenv_cfg="${venv_dir}/pyvenv.cfg"
+    if [ -f "${pyvenv_cfg}" ]; then
+        local portable_dir="$(_portable_dir)"
+        # Resolve to absolute path - this ensures it works when the backend is copied
+        # Only resolve if the directory exists (it should if ensurePortablePython was called)
+        if [ -d "${portable_dir}" ]; then
+            portable_dir="$(cd "${portable_dir}" && pwd)"
+        else
+            # Fallback to relative path if directory doesn't exist yet
+            portable_dir="../python"
+        fi
+        local sed_i=(sed -i)
+        # macOS/BSD sed needs a backup suffix; GNU sed doesn't. Make it portable:
+        if sed --version >/dev/null 2>&1; then
+            sed_i=(sed -i)
+        else
+            sed_i=(sed -i '')
+        fi
+        # Update the home field in pyvenv.cfg
+        # Handle both absolute paths (starting with /) and relative paths
+        if grep -q "^home = " "${pyvenv_cfg}"; then
+            "${sed_i[@]}" "s|^home = .*|home = ${portable_dir}|" "${pyvenv_cfg}"
+        else
+            # If home field doesn't exist, add it
+            echo "home = ${portable_dir}" >> "${pyvenv_cfg}"
+        fi
+    fi
+
+    # 3) Rewrite shebangs of entry points to use env, so the venv is relocatable
     #    Only touch text files that start with #! and reference the current venv.
     local ve_abs="${vbin}/python"
     local sed_i=(sed -i)
@@ -321,8 +352,14 @@ function ensureVenv() {
     fi
 
     # We call it here to make sure that when we source a venv we can still use python as expected
+    # Also make existing venvs portable if we're using portable Python (e.g., after copying from container)
     if [ -x "$(_portable_python)" ]; then
         _macosPortableEnv
+        # If venv exists and we're using portable Python, ensure it's made portable
+        # This handles the case where the venv was copied from a container
+        if [ -d "${EDIR}/venv" ] && [ "x${PORTABLE_PYTHON}" == "xtrue" ]; then
+            _makeVenvPortable
+        fi
     fi
 
     if [ "x${VIRTUAL_ENV:-}" != "x${EDIR}/venv" ]; then