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LocalStore: Allow the physical and logical store directories to differ

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This is primarily to subsume the functionality of the
copy-from-other-stores substituter. For example, in the NixOS
installer, we can now do (assuming we're in the target chroot, and the
Nix store of the installation CD is bind-mounted on /tmp/nix):

  $ nix-build ... --option substituters 'local?state=/tmp/nix/var&real=/tmp/nix/store'

However, unlike copy-from-other-stores, this also allows write access
to such a store. One application might be fetching substitutes for
/nix/store in a situation where the user doesn't have sufficient
privileges to create /nix, e.g.:

  $ NIX_REMOTE="local?state=/home/alice/nix/var&real=/home/alice/nix/store" nix-build ...
This commit is contained in:
Eelco Dolstra 2016-06-02 15:08:18 +02:00
parent 064816ab98
commit 4494000e04
7 changed files with 68 additions and 158 deletions
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3
src/libstore/build.cc
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@ -1269,6 +1269,9 @@ void DerivationGoal::tryToBuild()
{
trace("trying to build");
if (worker.store.storeDir != worker.store.realStoreDir)
throw Error("building with a diverted Nix store is not supported");
/* Check for the possibility that some other goal in this process
has locked the output since we checked in haveDerivation().
(It can't happen between here and the lockPaths() call below