Allow CONDA_OVERRIDE_X for __osx and __glibc native checks

CONSTRUCT.md

@@ -122,8 +122,10 @@ A list of virtual packages that must be satisfied at install time. Virtual
 packages must start with `__`. For example, `__osx>=11` or `__glibc>=2.24`.
 These specs are dry-run solved offline by the bundled `--conda-exe` binary.
 In SH installers, `__glibc>=x.y` and `__osx>=x.y` specs can be checked with
-Bash only. In PKG installers, `__osx` specs can be checked natively without
-the solver being involved as long as only `>=`, `<` or `,` are used.
+Bash only. The detected version can be overriden with environment variables
+`CONDA_OVERRIDE_GLIBC` and `CONDA_OVERRIDE_OSX`, respectively. In PKG
+installers, `__osx` specs can be checked natively without the solver being
+involved as long as only `>=`, `<` or `,` are used.
 
 ### `exclude`
 

constructor/construct.py

@@ -88,8 +88,10 @@
 packages must start with `__`. For example, `__osx>=11` or `__glibc>=2.24`.
 These specs are dry-run solved offline by the bundled `--conda-exe` binary.
 In SH installers, `__glibc>=x.y` and `__osx>=x.y` specs can be checked with
-Bash only. In PKG installers, `__osx` specs can be checked natively without
-the solver being involved as long as only `>=`, `<` or `,` are used.
+Bash only. The detected version can be overriden with environment variables
+`CONDA_OVERRIDE_GLIBC` and `CONDA_OVERRIDE_OSX`, respectively. In PKG
+installers, `__osx` specs can be checked natively without the solver being
+involved as long as only `>=`, `<` or `,` are used.
 '''),
 
     ('exclude',                False, list, '''

constructor/header.sh

@@ -23,44 +23,47 @@ fi
 
 #if osx and min_osx_version
 min_osx_version="__MIN_OSX_VERSION__"
-system_osx_version=$(SYSTEM_VERSION_COMPAT=0 sw_vers -productVersion)
+system_osx_version="${CONDA_OVERRIDE_OSX:-$(SYSTEM_VERSION_COMPAT=0 sw_vers -productVersion)}"
 # shellcheck disable=SC2183 disable=SC2046
 int_min_osx_version="$(printf "%02d%02d%02d" $(echo "$min_osx_version" | sed 's/\./ /g'))"
 # shellcheck disable=SC2183 disable=SC2046
 int_system_osx_version="$(printf "%02d%02d%02d" $(echo "$system_osx_version" | sed 's/\./ /g'))"
-if [  "$int_system_osx_version" -lt "$int_min_osx_version" ]; then
+if [ "$int_system_osx_version" -lt "$int_min_osx_version" ]; then
     echo "Installer requires macOS >=${min_osx_version}, but system has ${system_osx_version}."
     exit 1
 fi
 #endif
 #if linux and min_glibc_version
 min_glibc_version="__MIN_GLIBC_VERSION__"
-case "$(ldd --version 2>&1)" in
-    *musl*)
-        # musl ldd will report musl version; call libc.so directly
-        # see https://github.com/conda/constructor/issues/850#issuecomment-2343756454
-        libc_so="$(find /lib /usr/local/lib /usr/lib -name 'libc.so.*' -print -quit 2>/dev/null)"
-        if [ -z "${libc_so}" ]; then
-            libc_so="$(strings /etc/ld.so.cache | grep '^/.*/libc\.so.*' | head -1)"
-        fi
-        if [ -z "${libc_so}" ]; then
-            echo "Warning: Couldn't find libc.so; won't be able to determine GLIBC version!" >&2
-            echo "Override by setting CONDA_OVERRIDE_GLIBC" >&2
-            system_glibc_version="${CONDA_OVERRIDE_GLIBC:-0.0}"
-        else
-            system_glibc_version=$("${libc_so}" --version | awk 'NR==1{ sub(/\.$/, ""); print $NF}')
-        fi
-    ;;
-    *)
-        # ldd reports glibc in the last field of the first line
-        system_glibc_version=$(ldd --version | awk 'NR==1{print $NF}')
-    ;;
-esac
+system_glibc_version="${CONDA_OVERRIDE_GLIBC:-}"
+if [ "${system_glibc_version}" = "" ]; then
+    case "$(ldd --version 2>&1)" in
+        *musl*)
+            # musl ldd will report musl version; call libc.so directly
+            # see https://github.com/conda/constructor/issues/850#issuecomment-2343756454
+            libc_so="$(find /lib /usr/local/lib /usr/lib -name 'libc.so.*' -print -quit 2>/dev/null)"
+            if [ -z "${libc_so}" ]; then
+                libc_so="$(strings /etc/ld.so.cache | grep '^/.*/libc\.so.*' | head -1)"
+            fi
+            if [ -z "${libc_so}" ]; then
+                echo "Warning: Couldn't find libc.so; won't be able to determine GLIBC version!" >&2
+                echo "Override by setting CONDA_OVERRIDE_GLIBC" >&2
+                system_glibc_version="0.0"
+            else
+                system_glibc_version=$("${libc_so}" --version | awk 'NR==1{ sub(/\.$/, ""); print $NF}')
+            fi
+        ;;
+        *)
+            # ldd reports glibc in the last field of the first line
+            system_glibc_version=$(ldd --version | awk 'NR==1{print $NF}')
+        ;;
+    esac
+fi
 # shellcheck disable=SC2183 disable=SC2046
 int_min_glibc_version="$(printf "%02d%02d%02d" $(echo "$min_glibc_version" | sed 's/\./ /g'))"
 # shellcheck disable=SC2183 disable=SC2046
 int_system_glibc_version="$(printf "%02d%02d%02d" $(echo "$system_glibc_version" | sed 's/\./ /g'))"
-if [  "$int_system_glibc_version" -lt "$int_min_glibc_version" ]; then
+if [ "$int_system_glibc_version" -lt "$int_min_glibc_version" ]; then
     echo "Installer requires GLIBC >=${min_glibc_version}, but system has ${system_glibc_version}."
     exit 1
 fi
@@ -479,7 +482,7 @@ mkdir -p "$TMP"
 # but we haven't created $PREFIX/pkgs yet... give it a temp location
 # shellcheck disable=SC2050
 if [ "__VIRTUAL_SPECS__" != "" ]; then
-    echo 'Checking virtual specs compatibility: __VIRTUAL_SPECS__'
+    echo "Checking virtual specs compatibility:" __VIRTUAL_SPECS__
     CONDA_QUIET="$BATCH" \
     CONDA_SOLVER="classic" \
     CONDA_PKGS_DIRS="$(mktemp -d)" \

docs/source/construct-yaml.md

@@ -122,8 +122,10 @@ A list of virtual packages that must be satisfied at install time. Virtual
 packages must start with `__`. For example, `__osx>=11` or `__glibc>=2.24`.
 These specs are dry-run solved offline by the bundled `--conda-exe` binary.
 In SH installers, `__glibc>=x.y` and `__osx>=x.y` specs can be checked with
-Bash only. In PKG installers, `__osx` specs can be checked natively without
-the solver being involved as long as only `>=`, `<` or `,` are used.
+Bash only. The detected version can be overriden with environment variables
+`CONDA_OVERRIDE_GLIBC` and `CONDA_OVERRIDE_OSX`, respectively. In PKG
+installers, `__osx` specs can be checked natively without the solver being
+involved as long as only `>=`, `<` or `,` are used.
 
 ### `exclude`
 

news/888-overrides-vpkgs

@@ -0,0 +1,19 @@
+### Enhancements
+
+* Allow `__glibc` and `__osx` overrides with `CONDA_OVERRIDE_GLIBC` and `CONDA_OVERRIDE_OSX` environment variables, respectively (`.sh` installers only). (#888)
+
+### Bug fixes
+
+* <news item>
+
+### Deprecations
+
+* <news item>
+
+### Docs
+
+* <news item>
+
+### Other
+
+* <news item>

tests/test_examples.py

@@ -339,7 +339,11 @@ def _sort_by_extension(path):
             )
         yield installer, install_dir
         if KEEP_ARTIFACTS_PATH:
-            shutil.move(str(installer), str(KEEP_ARTIFACTS_PATH))
+            try:
+                shutil.move(str(installer), str(KEEP_ARTIFACTS_PATH))
+            except shutil.Error:
+                # Some tests reuse the examples for different checks; ignore errors
+                pass
 
 
 @lru_cache(maxsize=None)
@@ -844,6 +848,24 @@ def test_virtual_specs_ok(tmp_path, request):
         )
 
 
+@pytest.mark.skipif(sys.platform.startswith("win"), reason="Unix only")
+def test_virtual_specs_override(tmp_path, request, monkeypatch):
+    input_path = _example_path("virtual_specs_failed")
+    for installer, install_dir in create_installer(input_path, tmp_path):
+        if installer.name.endswith(".pkg"):
+            continue
+        monkeypatch.setenv("CONDA_OVERRIDE_GLIBC", "20")
+        monkeypatch.setenv("CONDA_OVERRIDE_OSX", "30")
+        _run_installer(
+            input_path,
+            installer,
+            install_dir,
+            request=request,
+            check_subprocess=True,
+            uninstall=True,
+        )
+
+
 @pytest.mark.xfail(
     CONDA_EXE == StandaloneExe.CONDA and CONDA_EXE_VERSION < Version("24.9.0"),
     reason="Pre-existing .condarc breaks installation",