wroclaw-git-backups/nix
1
0
Fork 0
mirror of https://github.com/NixOS/nix synced 2025-07-03 02:01:48 +02:00
Code Activity

Remove setting of the immutable bit

Browse source 
Using the immutable bit is problematic, especially in conjunction with
store optimisation.  For instance, if the garbage collector deletes a
file, it has to clear its immutable bit, but if the file has
additional hard links, we can't set the bit afterwards because we
don't know the remaining paths.

So now that we support having the entire Nix store as a read-only
mount, we may as well drop the immutable bit.  Unfortunately, we have
to keep the code to clear the immutable bit for backwards
compatibility.
This commit is contained in:
Eelco Dolstra 2012-09-19 16:17:54 -04:00
parent b9124a5c33
commit b9c2b4d5b4
5 changed files with 34 additions and 95 deletions
Download patch file Download diff file Expand all files Collapse all files

13
src/libstore/build.cc
View file

@ -1355,11 +1355,6 @@ void DerivationGoal::buildDone()
/* Delete the chroot (if we were using one). */
autoDelChroot.reset(); /* this runs the destructor */
/* Deleting the chroot will have caused the immutable bits on
hard-linked inputs to be cleared. So set them again. */
foreach (PathSet::iterator, i, regularInputPaths)
makeImmutable(*i);
/* Delete redirected outputs (when doing hash rewriting). */
foreach (PathSet::iterator, i, redirectedOutputs)
deletePath(*i);
@ -1766,11 +1761,8 @@ void DerivationGoal::startBuilder()
/* Hard-linking fails if we exceed the maximum
link count on a file (e.g. 32000 of ext3),
which is quite possible after a `nix-store
--optimise'. It can also fail if another
process called makeImmutable() on *i after we
did makeMutable(). In those cases, make a copy
instead. */
if (errno != EMLINK && errno != EPERM)
--optimise'. */
if (errno != EMLINK)
throw SysError(format("linking `%1%' to `%2%'") % p % *i);
StringSink sink;
dumpPath(*i, sink);
@ -1778,7 +1770,6 @@ void DerivationGoal::startBuilder()
restorePath(p, source);
}
makeImmutable(*i);
regularInputPaths.insert(*i);
}
}