feat: allow disabling caches with --no-cache option or PDM_NO_CACHE

news/2702.feature.md

@@ -0,0 +1 @@
+Caches can be disabled by using the `--no-cache` option or setting the `PDM_NO_CACHE` environment variable.

src/pdm/cli/completions/pdm.bash

@@ -24,7 +24,7 @@ _pdm_a919b69078acdf0a_complete()
 
     # completing for an option
     if [[ ${cur} == --* ]] ; then
-        opts="--config --help --ignore-python --pep582 --quiet --verbose --version"
+        opts="--config --help --ignore-python --no-cache --pep582 --quiet --verbose --version"
 
         case "$com" in
 

src/pdm/cli/completions/pdm.fish

@@ -14,6 +14,7 @@ end
 complete -c pdm -n '__fish_pdm_a919b69078acdf0a_complete_no_subcommand' -l config -d 'Specify another config file path [env var: PDM_CONFIG_FILE] '
 complete -c pdm -n '__fish_pdm_a919b69078acdf0a_complete_no_subcommand' -l help -d 'Show this help message and exit.'
 complete -c pdm -n '__fish_pdm_a919b69078acdf0a_complete_no_subcommand' -l ignore-python -d 'Ignore the Python path saved in .pdm-python. [env var: PDM_IGNORE_SAVED_PYTHON]'
+complete -c pdm -n '__fish_pdm_a919b69078acdf0a_complete_no_subcommand' -l no-cache -d 'Disable the cache for the current command. [env var: PDM_NO_CACHE]'
 complete -c pdm -n '__fish_pdm_a919b69078acdf0a_complete_no_subcommand' -l pep582 -d 'Print the command line to be eval\'d by the shell'
 complete -c pdm -n '__fish_pdm_a919b69078acdf0a_complete_no_subcommand' -l quiet -d 'Suppress output'
 complete -c pdm -n '__fish_pdm_a919b69078acdf0a_complete_no_subcommand' -l verbose -d 'Use `-v` for detailed output and `-vv` for more detailed'

src/pdm/cli/completions/pdm.ps1

@@ -482,7 +482,7 @@ function TabExpansion($line, $lastWord) {
             default {
                 # No command
                 $command = $null
-                $completer.AddOpts(([Option]::new(("--pep582", "-I", "--ignore-python", "-c", "--config"))))
+                $completer.AddOpts(([Option]::new(("--pep582", "-I", "--ignore-python", "-c", "--config", "--no-cache"))))
                 $completer.AddParams($AllCommands, $false)
             }
         }

src/pdm/cli/completions/pdm.zsh

@@ -46,6 +46,7 @@ _pdm() {
     {-c,--config}'[Specify another config file path\[env var: PDM_CONFIG_FILE\]]' \
     {-V,--version}'[Show the version and exit]' \
     {-I,--ignore-python}'[Ignore the Python path saved in .pdm-python]' \
+    '--no-cache:Disable the cache for the current command. [env var: PDM_NO_CACHE]' \
     '--pep582:Print the command line to be eval by the shell:shell:(zsh bash fish tcsh csh)' \
     '*:: :->_subcmds' \
     && return 0

src/pdm/cli/options.py

@@ -152,6 +152,12 @@ def from_splitted_env(name: str, separator: str) -> list[str] | None:
 )
 verbose_option.add_argument("-q", "--quiet", action="store_const", const=-1, dest="verbose", help="Suppress output")
 
+no_cache_option = Option(
+    "--no-cache",
+    action="store_true",
+    default=os.getenv("PDM_NO_CACHE"),
+    help="Disable the cache for the current command. [env var: PDM_NO_CACHE]",
+)
 
 dry_run_option = Option(
     "--dry-run",

src/pdm/core.py

@@ -23,7 +23,7 @@
 
 from pdm import termui
 from pdm.__version__ import __version__
-from pdm.cli.options import ignore_python_option, pep582_option, verbose_option
+from pdm.cli.options import ignore_python_option, no_cache_option, pep582_option, verbose_option
 from pdm.cli.utils import ArgumentParser, ErrorArgumentParser
 from pdm.compat import importlib_metadata
 from pdm.exceptions import PdmArgumentError, PdmUsageError
@@ -89,6 +89,7 @@ def init_parser(self) -> None:
             help="Specify another config file path [env var: PDM_CONFIG_FILE] ",
         )
         verbose_option.add_to_parser(self.parser)
+        no_cache_option.add_to_parser(self.parser)
         ignore_python_option.add_to_parser(self.parser)
         pep582_option.add_to_parser(self.parser)
 
@@ -149,6 +150,10 @@ def handle(self, project: Project, options: argparse.Namespace) -> None:
 
         command = cast("BaseCommand | None", getattr(options, "command", None))
         self.config_settings = getattr(options, "config_setting", None)
+
+        if options.no_cache:
+            project.cache_dir = Path(self.create_temp_dir(prefix="pdm-cache-"))
+
         hooks = HookManager(project, getattr(options, "skip", None))
         hooks.try_emit("pre_invoke", command=command.name if command else None, options=options)
 

src/pdm/project/core.py

@@ -77,6 +77,7 @@ def __init__(
         self._lockfile: Lockfile | None = None
         self._environment: BaseEnvironment | None = None
         self._python: PythonInfo | None = None
+        self._cache_dir: Path | None = None
         self.core = core
 
         if global_config is None:
@@ -587,7 +588,13 @@ def backend(self) -> BuildBackend:
 
     @property
     def cache_dir(self) -> Path:
-        return Path(self.config.get("cache_dir", "")).expanduser()
+        if self._cache_dir is None:
+            self._cache_dir = Path(self.config.get("cache_dir", "")).expanduser()
+        return self._cache_dir
+
+    @cache_dir.setter
+    def cache_dir(self, value: Path) -> None:
+        self._cache_dir = value
 
     def cache(self, name: str) -> Path:
         path = self.cache_dir / name

tests/cli/test_add.py

@@ -321,3 +321,12 @@ def test_add_update_reuse_installed_config(project, working_set, repository, pdm
     pdm(["add", "foo"], obj=project, strict=True)
     locked_candidates = project.locked_repository.all_candidates
     assert locked_candidates["foo"].version == "1.0.0"
+
+
+def test_add_disable_cache(project, pdm, working_set):
+    cache_dir = project.cache_dir
+    pdm(["--no-cache", "add", "requests"], obj=project, strict=True)
+    assert "requests" in working_set
+
+    files = [file for file in cache_dir.rglob("*") if file.is_file()]
+    assert not files