Require at least Python 2.6. fixes #1658

[tahoe-lafs/tahoe-lafs.git] / src / allmydata / __init__.py

diff --git a/src/allmydata/__init__.py b/src/allmydata/__init__.py
index 7c5236335a3f278154448ada07c2d45b995c45c0..f6eff199e45019d2da08faa1f0a1182aca81d3b4 100644 (file)
--- a/src/allmydata/__init__.py
+++ b/src/allmydata/__init__.py
@@ -291,6 +291,12 @@ def cross_check(pkg_resources_vers_and_locs, imported_vers_and_locs_list):
                 continue
 
             pr_ver, pr_loc = pkg_resources_vers_and_locs[name]
+            if imp_ver is None and imp_loc is None:
+                errors.append("Warning: dependency %r could not be imported. pkg_resources thought it should be possible "
+                              "to import version %r from %r.\nThe exception trace was %r."
+                              % (name, pr_ver, pr_loc, imp_comment))
+                continue
+
             try:
                 pr_normver = normalized_version(pr_ver)
             except Exception, e:
@@ -351,14 +357,14 @@ def check_all_requirements():
 
     errors = []
 
-    # We require at least 2.5 on all platforms.
+    # We require at least 2.6 on all platforms.
     # (On Python 3, we'll have failed long before this point.)
-    if sys.version_info < (2, 5):
+    if sys.version_info < (2, 6):
         try:
             version_string = ".".join(map(str, sys.version_info))
         except Exception:
             version_string = repr(sys.version_info)
-        errors.append("Tahoe-LAFS current requires Python v2.5 or greater (but less than v3), not %s"
+        errors.append("Tahoe-LAFS currently requires Python v2.6 or greater (but less than v3), not %s"
                       % (version_string,))
 
     vers_and_locs = dict(_vers_and_locs_list)