about summary refs log tree commit diff
path: root/src/libmain
diff options
context:
space:
mode:
authorEelco Dolstra <e.dolstra@tudelft.nl>2004-06-28T10·42+0000
committerEelco Dolstra <e.dolstra@tudelft.nl>2004-06-28T10·42+0000
commit91dc023665e22eb5637bf08c405e91ac9060c357 (patch)
tree566e96b4670653bc9ab68f042e94808dcdcb5b29 /src/libmain
parentb113edeab780216b0590045b932be685d1399e9b (diff)
* Added a switch `--fallback'. From the manual:
  Whenever Nix attempts to realise a derivation for which a closure is
  already known, but this closure cannot be realised, fall back on
  normalising the derivation.

  The most common scenario in which this is useful is when we have
  registered substitutes in order to perform binary distribution from,
  say, a network repository.  If the repository is down, the
  realisation of the derivation will fail.  When this option is
  specified, Nix will build the derivation instead.  Thus, binary
  installation falls back on a source installation.  This option is
  not the default since it is generally not desirable for a transient
  failure in obtaining the substitutes to lead to a full build from
  source (with the related consumption of resources).


Diffstat (limited to 'src/libmain')
-rw-r--r--src/libmain/shared.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libmain/shared.cc b/src/libmain/shared.cc
index 13ad4fedea19..6aad03a37a98 100644
--- a/src/libmain/shared.cc
+++ b/src/libmain/shared.cc
@@ -139,6 +139,8 @@ static void initAndRun(int argc, char * * argv)
             keepFailed = true;
         else if (arg == "--keep-going" || arg == "-k")
             keepGoing = true;
+        else if (arg == "--fallback")
+            tryFallback = true;
         else if (arg == "--max-jobs" || arg == "-j") {
             ++i;
             if (i == args.end()) throw UsageError("`--max-jobs' requires an argument");