Commit graph

735 commits

Author SHA1 Message Date
Eelco Dolstra 5526a282b5 Security: Don't allow builders to change permissions on files they don't own
It turns out that in multi-user Nix, a builder may be able to do

  ln /etc/shadow $out/foo

Afterwards, canonicalisePathMetaData() will be applied to $out/foo,
causing /etc/shadow's mode to be set to 444 (readable by everybody but
writable by nobody).  That's obviously Very Bad.

Fortunately, this fails in NixOS's default configuration because
/nix/store is a bind mount, so "ln" will fail with "Invalid
cross-device link".  It also fails if hard-link restrictions are
enabled, so a workaround is:

  echo 1 > /proc/sys/fs/protected_hardlinks

The solution is to check that all files in $out are owned by the build
user.  This means that innocuous operations like "ln
${pkgs.foo}/some-file $out/" are now rejected, but that already failed
in chroot builds anyway.
2013-02-26 02:30:19 +01:00
Ludovic Courtès 3e067ac11c Add `Settings::nixDaemonSocketFile'. 2013-02-19 10:19:18 +01:00
Ludovic Courtès 5ea138dc4b Enable chroot support on old glibc versions. 2013-02-19 10:19:11 +01:00
Eelco Dolstra 5e9c3da412 Only warn about SQLite being busy once
No need to get annoying.
2013-01-23 16:45:10 +01:00
Eelco Dolstra 536c85ea49 Store build logs in /nix/var/log/nix/drvs/<XX>
...where <XX> is the first two characters of the derivation.
Otherwise /nix/var/log/nix/drvs may become so large that we run into
all sorts of weird filesystem limits/inefficiences.  For instance,
ext3/ext4 filesystems will barf with "ext4_dx_add_entry:1551:
Directory index full!" once you hit a few million files.
2013-01-17 15:47:26 +01:00
Eelco Dolstra e42df686f3 Delete a left-over trash directory before doing a GC 2013-01-05 00:13:29 +01:00
Eelco Dolstra 92926be2fe Fix "0 store paths deleted" message 2013-01-04 15:17:19 +01:00
Eelco Dolstra b424d29d1b Open the database after removing immutable bits 2013-01-03 13:29:17 +01:00
Eelco Dolstra def5160b61 Clear any immutable bits in the Nix store
Doing this once makes subsequent operations like garbage collecting
more efficient since we don't have to call makeMutable() first.
2013-01-03 12:59:23 +01:00
Eelco Dolstra 299141ecbd If a substitute closure is incomplete, build dependencies, then retry the substituter
Issue #77.
2013-01-02 12:38:28 +01:00
Eelco Dolstra 1b3a78a459 Automatically fall back if the references of a substitute are not substitutable
Fixes #77.
2013-01-02 12:00:26 +01:00
Eelco Dolstra 12f9129f60 nix-build: Support talking to old daemons
Fixes #76.
2012-12-29 23:21:46 +01:00
Eelco Dolstra b7629778ef Allow mounting a path in a different location in the chroot
Fixes #24.
2012-12-29 23:04:02 +01:00
Eelco Dolstra 2754a07ead nix-store -q --roots: Respect the gc-keep-outputs/gc-keep-derivations settings
So if a path is not garbage solely because it's reachable from a root
due to the gc-keep-outputs or gc-keep-derivations settings, ‘nix-store
-q --roots’ now shows that root.
2012-12-20 18:41:44 +01:00
Eelco Dolstra 06f62defe6 Yet another rewrite of the garbage collector
But this time it's *obviously* correct!  No more segfaults due to
infinite recursions for sure, etc.

Also, move directories to /nix/store/trash instead of renaming them to
/nix/store/bla-gc-<pid>.  Then we can just delete /nix/store/trash at
the end.
2012-12-20 17:32:15 +01:00
Eelco Dolstra e775d4d84f If gc-keep-derivations is set, only keep the actual deriver
This prevents zillions of derivations from being kept, and fixes an
infinite recursion in the garbage collector (due to an obscure cycle
that can occur with fixed-output derivations).
2012-12-19 15:33:09 +01:00
Eelco Dolstra fbf0b2fa45 Kill the build hook rather than shutting it down cleanly
Waiting for the hook to shut down cleanly sometimes seems to lead to
hangs.
2012-12-19 11:47:42 +01:00
Eelco Dolstra 228ea7c2f9 Revert brain fart
This reverts commit cc511fd65b.
2012-12-18 20:43:47 +01:00
Eelco Dolstra cc511fd65b Check for potential infinite select() loops when building 2012-12-18 18:50:05 +01:00
Eelco Dolstra 772778c0ec On SQLITE_BUSY, wait a random amount of time
If all contending processes wait a fixed amount of time (100 ms),
there is a good probability that they'll just collide again.
2012-12-11 11:49:42 +01:00
Eelco Dolstra 8b8ee53bc7 Add builtin constants ‘langVersion’ and ‘nixVersion’
The integer constant ‘langVersion’ denotes the current language
version.  It gets increased every time a language feature is
added/changed/removed.  It's currently 1.

The string constant ‘nixVersion’ contains the current Nix version,
e.g. "1.2pre2980_9de6bc5".
2012-11-27 13:29:55 +01:00
Eelco Dolstra 5943f41b8b queryMissing(): Handle partially valid derivations 2012-11-26 18:25:12 +01:00
Eelco Dolstra 8d8d47abd2 Only substitute wanted outputs of a derivation
If a derivation has multiple outputs, then we only want to download
those outputs that are actuallty needed.  So if we do "nix-build -A
openssl.man", then only the "man" output should be downloaded.
Likewise if another package depends on ${openssl.man}.

The tricky part is that different derivations can depend on different
outputs of a given derivation, so we may need to restart the
corresponding derivation goal if that happens.
2012-11-26 17:15:09 +01:00
Eelco Dolstra 46a369ad95 Make "nix-build -A <derivation>.<output>" do the right thing
For example, given a derivation with outputs "out", "man" and "bin":

  $ nix-build -A pkg

produces ./result pointing to the "out" output;

  $ nix-build -A pkg.man

produces ./result-man pointing to the "man" output;

  $ nix-build -A pkg.all

produces ./result, ./result-man and ./result-bin;

  $ nix-build -A pkg.all -A pkg2

produces ./result, ./result-man, ./result-bin and ./result-2.
2012-11-26 15:39:10 +01:00
Eelco Dolstra f794465ca8 Disable use of vfork()
vfork() is just too weird.  For instance, in this build:

  http://hydra.nixos.org/build/3330487

the value fromHook.writeSide becomes corrupted in the parent, even
though the child only reads from it.  At -O0 the problem goes away.
Probably the child is overriding some spilled temporary variable.

If I get bored I may implement using posix_spawn() instead.
2012-11-15 19:35:18 +01:00
Eelco Dolstra 8541d27fce Don't use std::cerr in a few places
Slightly scared of using std::cerr in a vforked process...
2012-11-15 15:01:02 +01:00
Eelco Dolstra ea89df2b76 Use vfork() instead of fork() if available
Hopefully this reduces the chance of hitting ‘unable to fork: Cannot
allocate memory’ errors.  vfork() is used for everything except
starting builders.
2012-11-09 18:00:33 +01:00
Eelco Dolstra 48c19c4633 Remove definition of non-existant function 2012-11-09 17:59:41 +01:00
Eelco Dolstra 198dbe7fa1 Remove some redundant close() calls
They are unnecessary because we set the close-on-exec flag.
2012-11-09 16:58:51 +01:00
Eelco Dolstra 10dcee99ed Remove the quickExit function 2012-11-09 16:42:10 +01:00
Eelco Dolstra 4c9e3fa641 Remove a Darwin hack that should no longer be needed 2012-11-09 16:35:42 +01:00
Eelco Dolstra f581ce0b0c Don't start copy-from-other-stores if $NIX_OTHER_STORES is unset
Slight optimisation.
2012-11-09 14:58:10 +01:00
Eelco Dolstra 91ef4d9a81 Remove unnecessary call to closeMostFDs()
We have close-on-exec on all FDs now, and there is no security risk in
passing open FDs to substituters anyway.
2012-11-09 14:43:47 +01:00
Shea Levy d0fc615af6 canonicalizePathMetaData: Fall-back to utimes if lutimes fails due to ENOSYS 2012-11-06 11:29:59 +01:00
Eelco Dolstra 4c34d384e6 If hashes do not match, print them in base-32 for SHA-1/SHA-256
Fixes #57.
2012-10-23 18:05:50 +02:00
Eelco Dolstra e345182055 Shorten the names of temporary build directories 2012-10-11 14:03:06 -04:00
Eelco Dolstra 904f50412c nix-store --verify: Continue on errors 2012-10-04 10:20:23 -04:00
Eelco Dolstra 90b8a34f82 Fix regular expression
http://hydra.nixos.org/build/3123177
2012-10-04 09:46:10 -04:00
Eelco Dolstra 522ecab9b8 Drop support for running nix-worker in "slave" mode
AFAIK nobody uses this, setuid binaries are evil, and there is no good
reason why people can't just run the daemon.
2012-10-03 17:30:45 -04:00
Eelco Dolstra 7586095504 Remove bin2c 2012-10-03 16:59:28 -04:00
Eelco Dolstra 2bbc4a214e nix-env: Support ‘--repair’ flag 2012-10-03 15:35:42 -04:00
Eelco Dolstra 0a7084567f Add a ‘--repair’ flag to nix-instantiate
This allows repairing corrupted derivations and other source files.
2012-10-03 15:09:18 -04:00
Eelco Dolstra a807edfae8 Handle repairing paths that are in build-chroot-dirs 2012-10-03 11:20:16 -04:00
Eelco Dolstra a3f205b249 When repairing a derivation, check and repair the entire output closure
If we find a corrupted path in the output closure, we rebuild the
derivation that produced that particular path.
2012-10-03 10:38:09 -04:00
Eelco Dolstra 2001895f3d Add a --repair flag to ‘nix-store -r’ to repair derivation outputs
With this flag, if any valid derivation output is missing or corrupt,
it will be recreated by using a substitute if available, or by
rebuilding the derivation.  The latter may use hash rewriting if
chroots are not available.
2012-10-02 17:13:46 -04:00
Eelco Dolstra 8e3a7bd712 nix-store --verify: Add an option ‘--repair’ to repair all missing/corrupt paths
Also, return a non-zero exit code if errors remain after
verifying/repairing.
2012-10-02 15:12:56 -04:00
Eelco Dolstra 9958bd6992 Add operation ‘nix-store --repair-path’
This operation allows fixing corrupted or accidentally deleted store
paths by redownloading them using substituters, if available.

Since the corrupted path cannot be replaced atomically, there is a
very small time window (one system call) during which neither the old
(corrupted) nor the new (repaired) contents are available.  So
repairing should be used with some care on critical packages like
Glibc.
2012-10-02 14:08:59 -04:00
Eelco Dolstra e666e1156f Handle octal escapes in /proc/self/mountinfo 2012-09-28 21:39:30 -04:00
Eelco Dolstra f406288cc7 Print a more descriptive error message if setting up the build environment fails 2012-09-28 21:37:02 -04:00
Eelco Dolstra d534f137f0 Make the store writable before creating /nix/store/.links 2012-09-25 16:30:08 -04:00