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865 commits

Author SHA1 Message Date
Eelco Dolstra a82d80ddeb * Move setuidCleanup() to libutil. 2006-12-07 16:40:41 +00:00
Eelco Dolstra f76fdb6d42 * If not running as root, let the setuid helper kill the build user's 
processes before and after the build.
 2006-12-07 16:33:31 +00:00
Eelco Dolstra ec23ecc64d * In the garbage collector, if deleting a path fails, try to fix its 
ownership, then try again.
 2006-12-07 15:54:52 +00:00
Eelco Dolstra a0a43c3206 * When not running as root, call the setuid helper to change the 
ownership of the build result after the build.
 2006-12-07 15:18:14 +00:00
Eelco Dolstra 6a07ff1ec0 * Change the ownership of store paths to the Nix account before 
deleting them using the setuid helper.
 2006-12-07 14:14:35 +00:00
Eelco Dolstra 7d8cf316ee * Pass the actual build user to the setuid helper. 2006-12-07 11:27:32 +00:00
Eelco Dolstra a45c498e4e * If Nix is not running as root, call the setuid helper to start the 
builder under the desired build user.
 2006-12-07 00:42:30 +00:00
Eelco Dolstra 813a7c65c9 * Sanity check. 2006-12-07 00:19:27 +00:00
Eelco Dolstra 6a8e60913a * Move killUser() to libutil so that the setuid helper can use it. 2006-12-07 00:16:07 +00:00
Eelco Dolstra 79875c5e42 * Change the ownership of the current directory to the build user. 2006-12-06 23:52:25 +00:00
Eelco Dolstra 62ab131412 * Verify that the desired target user is in the build users group (as 
specified in the setuid config file).
 2006-12-06 23:15:26 +00:00
Eelco Dolstra f07ac41656 * Check that the caller is allowed to call the setuid helper. The 
allowed uid is specified in a configuration file in
  /etc/nix-setuid.conf.
 2006-12-06 22:45:41 +00:00
Eelco Dolstra ef281b93c2 * Fix the safety check. 2006-12-06 20:18:29 +00:00
Eelco Dolstra 6e5ec1029a * Get rid of `build-users'. We'll just take all the members of 
`build-users-group'.  This makes configuration easier: you can just
  add users in /etc/group.
 2006-12-06 20:00:15 +00:00
Eelco Dolstra 751f6d2157 * nix-setuid-helper: allow running programs under a different uid. 2006-12-06 17:29:10 +00:00
Eelco Dolstra 9f0efa6611 * Start of the setuid helper (the program that performs the operations 
that have to be done as root: running builders under different uids,
  changing ownership of build results, and deleting paths in the store
  with the wrong ownership).
 2006-12-06 01:24:02 +00:00
Eelco Dolstra 2b558843a2 * Be less chatty. 2006-12-05 19:01:19 +00:00
Eelco Dolstra 44cad9630f * Urgh. Do setgid() before setuid(), because the semantics of setgid() 
changes completely depending on whether you're root...
 2006-12-05 18:28:15 +00:00
Eelco Dolstra 6f0d050324 * Tricky: child processes should not send data to the client since 
that might mess up the protocol.  And besides, the socket file
  descriptor is probably closed.
 2006-12-05 18:21:16 +00:00
Eelco Dolstra 4c1c37d0b6 * FreeBSD returns ESRCH when there are no processes to kill. 2006-12-05 18:07:46 +00:00
Eelco Dolstra 8d1854c3f1 * Oops! In daemon mode, we can't run as root either if build-users is empty. 2006-12-05 17:44:19 +00:00
Eelco Dolstra 99655245ae * Use an explicit handler for SIGCHLD, since SIG_IGN doesn't do the 
right thing on FreeBSD 4 (it leaves zombies).
 2006-12-05 17:21:42 +00:00
Eelco Dolstra 62b0497c0f * Better message. 2006-12-05 16:17:01 +00:00
Eelco Dolstra c808e6252f * Ugly hack to handle spurious SIGPOLLs. 2006-12-05 15:36:31 +00:00
Eelco Dolstra fd4a9db91f * Some renaming. 2006-12-05 14:15:51 +00:00
Eelco Dolstra a9c4f66cfb * Allow unprivileged users to run the garbage collector and to do 
`nix-store --delete'.  But unprivileged users are not allowed to
  ignore liveness.
* `nix-store --delete --ignore-liveness': ignore the runtime roots as
  well.
 2006-12-05 02:18:46 +00:00
Eelco Dolstra 29cf434a35 * The determination of the root set should be made by the privileged 
process, so forward the operation.
* Spam the user about GC misconfigurations (NIX-71).
* findRoots: skip all roots that are unreadable - the warnings with
  which we spam the user should be enough.
 2006-12-05 01:31:45 +00:00
Eelco Dolstra 8623256f48 * findRoots: return a map from the symlink (outside of the store) to 
the store path (inside the store).
 2006-12-05 00:48:36 +00:00
Eelco Dolstra d27a73b1a9 * In addPermRoot, check that the root that we just registered can be 
found by the garbage collector.  This addresses NIX-71 and is a
  particular concern in multi-user stores.
 2006-12-05 00:34:42 +00:00
Eelco Dolstra 74033a844f * Add indirect root registration to the protocol so that unprivileged 
processes can register indirect roots.  Of course, there is still
  the problem that the garbage collector can only read the targets of
  the indirect roots when it's running as root...
 2006-12-04 23:29:16 +00:00
Eelco Dolstra 0d40f6d7bb * Not every OS knows about SIGPOLL. 2006-12-04 22:58:44 +00:00
Eelco Dolstra 7751160e9f * Don't redirect stderr. 2006-12-04 19:10:23 +00:00
Eelco Dolstra 40c3529909 * Handle exceptions and stderr for all protocol functions. 
* SIGIO -> SIGPOLL (POSIX calls it that).
* Use sigaction instead of signal to register the SIGPOLL handler.
  Sigaction is better defined, and a handler registered with signal
  appears not to interrupt fcntl(..., F_SETLKW, ...), which is bad.
 2006-12-04 17:55:14 +00:00
Eelco Dolstra 0130ef88ea * Daemon mode (`nix-worker --daemon'). Clients connect to the server 
via the Unix domain socket in /nix/var/nix/daemon.socket.  The
  server forks a worker process per connection.
* readString(): use the heap, not the stack.
* Some protocol fixes.
 2006-12-04 17:17:13 +00:00
Eelco Dolstra 4740baf3a6 * When NIX_REMOTE=daemon, connect to /nix/var/nix/daemon.socket 
instead of forking a worker.
 2006-12-04 14:21:39 +00:00
Eelco Dolstra f5f0cf423f * Refactoring. 2006-12-04 13:28:14 +00:00
Eelco Dolstra 052b6fb149 * Pass the verbosity level to the worker. 2006-12-04 13:15:29 +00:00
Eelco Dolstra 1e16d20655 * Install the worker in bindir, not libexecdir. 
* Allow the worker path to be overriden through the NIX_WORKER
  environment variable.
 2006-12-04 13:09:16 +00:00
Eelco Dolstra 9322b399f3 * Doh. 2006-12-03 20:41:22 +00:00
Eelco Dolstra f4279bcde0 * Don't run setuid root when build-users is empty. 
* Send startup errors to the client.
 2006-12-03 16:25:19 +00:00
Eelco Dolstra 35247c4c9f * Removed `build-allow-root'. 
* Added `build-users-group', the group under which builds are to be
  performed.
* Check that /nix/store has 1775 permission and is owner by the
  build-users-group.
 2006-12-03 15:32:38 +00:00
Eelco Dolstra 84d6459bd5 * Use setreuid if setresuid is not available. 2006-12-03 14:32:22 +00:00
Eelco Dolstra a9f9241054 * Handle a subtle race condition: the client closing the socket 
between the last worker read/write and the enabling of the signal
  handler.
 2006-12-03 03:16:27 +00:00
Eelco Dolstra 3ed9e4ad9b * Some hardcore magic to handle asynchronous client disconnects. 
The problem is that when we kill the client while the worker is
  building, and the builder is not writing anything to stderr, then
  the worker never notice that the socket is closed on the other side,
  so it just continues indefinitely.  The solution is to catch SIGIO,
  which is sent when the far side of the socket closes, and simulate
  an normal interruption.  Of course, SIGIO is also sent every time
  the client sends data over the socket, so we only enable the signal
  handler when we're not expecting any data...
 2006-12-03 03:03:36 +00:00
Eelco Dolstra 4251f94b32 * Use a Unix domain socket instead of pipes. 2006-12-03 02:36:44 +00:00
Eelco Dolstra 8c76df93e6 * Better error message if the worker doesn't start. 2006-12-03 02:22:04 +00:00
Eelco Dolstra 363f40022f * Pid::kill() should be interruptable. 2006-12-03 02:12:26 +00:00
Eelco Dolstra 7951c3c546 * Some hackery to propagate the worker's stderr and exceptions to the 
client.
 2006-12-03 02:08:13 +00:00
Eelco Dolstra 714fa24cfb * Run the worker in a separate session to prevent terminal signals 
from interfering.
 2006-12-03 00:52:27 +00:00
Eelco Dolstra e25fad691a * Move addTempRoot() to the store API, and add another function 
syncWithGC() to allow clients to register GC roots without needing
  write access to the global roots directory or the GC lock.
 2006-12-02 16:41:36 +00:00