Use a semi-persistent script path

src/python/cram/__main__.py

@@ -3,8 +3,6 @@
 import logging
 import os
 import pickle
-import platform
-import re
 from collections import defaultdict
 from pathlib import Path
 from pprint import pformat
@@ -18,6 +16,7 @@ from vfs import Vfs
 from . import __author__, __copyright__, __license__, __version__
 from .v0 import PackageV0, ProfileV0
 from .v1 import LightPackageV1, PackageV1, ProfileV1
+from .common import expandvars
 
 log = logging.getLogger(__name__)
 
@@ -60,29 +59,6 @@ def upsearch(name: Union[str, Path], limit=10) -> Optional[Path]:
         limit -= 1
 
 
-def expandvars(s: str) -> str:
-    def _repl(m: re.Match) -> str:
-        var = m.group(0).lower()
-        match var:
-            case "${hostname}":
-                return os.uname()[1].split(".")[0]
-            case "${fqdn}":
-                return os.uname()[1]
-            case "${home}":
-                return os.path.expanduser("~")
-            case "${uname}" | "${sysname}":
-                return platform.system().lower()
-            case "${arch}":
-                return platform.machine()
-            case "${release}":
-                return platform.release()
-            case _:
-                return os.path.expandvars(m.group(0))
-
-    s = re.sub(r"\${?([^\s}]+)}?", "${\\1}", s)
-    return re.sub(r"\$\{.*?\}", _repl, s)
-
-
 def handle_vars(_ctx, _param, s):
     return expandvars(s)
 
@@ -278,6 +254,8 @@ def configure(ctx, param, filename: Optional[Path]):
         log.debug(f"Loading config from {filename}")
         ctx.obj = cfg = toml.load(filename)
         assert cfg["cram"]["version"] >= 1
+        cfg["cram"]["config"] = str(filename.absolute())
+        cfg["cram"]["root"] = str(filename.absolute().parent)
 
         task_cfg = cfg.get("cram", {}).get("task", {})
         defaults = task_cfg.get("default", {})

src/python/cram/common.py

@@ -5,6 +5,8 @@ import sys
 from pathlib import Path
 from shlex import quote as sh_quote
 from typing import List, Optional
+import re
+import platform
 
 from vfs import Vfs
 
@@ -86,3 +88,26 @@ class Package(object):
 
     def post_install(self, fs: Vfs, dest: Path):
         pass
+
+
+def expandvars(s: str) -> str:
+    def _repl(m: re.Match) -> str:
+        var = m.group(0).lower()
+        match var:
+            case "${hostname}":
+                return os.uname()[1].split(".")[0]
+            case "${fqdn}":
+                return os.uname()[1]
+            case "${home}":
+                return os.path.expanduser("~")
+            case "${uname}" | "${sysname}":
+                return platform.system().lower()
+            case "${arch}":
+                return platform.machine()
+            case "${release}":
+                return platform.release()
+            case _:
+                return os.path.expandvars(m.group(0))
+
+    s = re.sub(r"\${?([^\s}]+)}?", "${\\1}", s)
+    return re.sub(r"\$\{.*?\}", _repl, s)

src/python/cram/v1.py

@@ -12,13 +12,17 @@ from typing import List, Optional, Union
 import toml
 from vfs import Vfs
 
-from .common import Package, sh, stow
+from .common import Package, sh, stow, expandvars
 
 
-def tempf(name):
-    root = Path("/tmp/stow")
-    root.mkdir(exist_ok=True, parents=True)
-    return root / name
+def tempf(global_config, name):
+    root = Path(global_config["cram"]["root"]) / ".cache" # Config root dir.
+    assert root.exists() and root.is_dir()
+
+    cache_dir = global_config.get("cram", {}).get("task", {}).get("default", {}).get("cache_dir")
+    cache_root = cache_dir and Path(expandvars(cache_dir)) or root
+
+    return cache_root / name[0:2] / name
 
 
 class PackageV1(Package):
@@ -76,10 +80,11 @@ class PackageV1(Package):
                     self.do_sh_or_script(fp.read(), fs, dest)
 
             elif content:
-                f = tempf(f"{sum}.sh")
+                f = tempf(self.global_config, f"{sum}.sh")
+                f.parent.mkdir(exist_ok=True, parents=True)
                 with open(f, "w") as fp:
                     fp.write(content)
-                    fs.exec(cwd, sh(self.global_config, [f]))
+                    fs.exec(cwd, sh(self.global_config, [str(f)]))
 
     def do_build(self, fs: Vfs, dest: Path):
         self.do_sh_or_script(self.config().get("package", {}).get("build"), fs, dest)