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2012-08-05 Fix race condition when two processes create a hard link to a file in .linksEelco Dolstra1-27/+37
This is a problem because one process may set the immutable bit before the second process has created its link. Addressed random Hydra failures such as: error: cannot rename `/nix/store/.tmp-link-17397-1804289383' to `/nix/store/rsvzm574rlfip3830ac7kmaa028bzl6h-nixos-0.1pre-git/upstart-interface-version': Operation not permitted
2012-08-05 Fix race condition when two processes create the same link in /nix/store/.linksEelco Dolstra1-4/+4
2012-08-01 Count bytes freed deleting unused linksEelco Dolstra2-3/+5
2012-08-01 Drop the block count in the garbage collectorEelco Dolstra5-16/+9
2012-08-01 nix-store --gc: Make ‘--max-freed 0’ do the right thingEelco Dolstra3-6/+5
That is, delete almost nothing (it will still remove unused links from /nix/store/.links).
2012-08-01 removeUnusedLinks(): Print stats on disk space saved by hard linkingEelco Dolstra1-1/+16
2012-08-01 DohEelco Dolstra1-1/+2
2012-08-01 Make ‘nix-store --optimise’ interruptibleEelco Dolstra1-0/+2
2012-07-26 Set permissions on temporary build directories to 0700Eelco Dolstra1-1/+2
Fixes #39.
2012-07-23 Handle platforms that don't support linking to a symlinkEelco Dolstra1-2/+7
E.g. Darwin doesn't allow this.
2012-07-23 Unlink the right fileEelco Dolstra1-2/+2
2012-07-23 Garbage collect unused links in /nix/store/.linksEelco Dolstra2-0/+39
Incremental optimisation requires creating links in /nix/store/.links to all files in the store. However, this means that if we delete a store path, no files are actually deleted because links in /nix/store/.links still exists. So we need to check /nix/store/.links for files with a link count of 1 and delete them.
2012-07-23 Automatically optimise the Nix store when a new path is addedEelco Dolstra4-9/+31
Auto-optimisation is enabled by default. It can be turned off by setting auto-optimise-store to false in nix.conf.
2012-07-23 optimiseStore(): Use a content-addressed file store in /nix/store/.linksEelco Dolstra2-107/+108
optimiseStore() now creates persistent, content-addressed hard links in /nix/store/.links. For instance, if it encounters a file P with hash H, it will create a hard link P' = /nix/store/.link/<H> to P if P' doesn't already exist; if P' exist, then P is replaced by a hard link to P'. This is better than the previous in-memory map, because it had the tendency to unnecessarily replace hard links with a hard link to whatever happened to be the first file with a given hash it encountered. It also allows on-the-fly, incremental optimisation.
2012-07-23 Use lutimes() if available to canonicalise the timestamp of symlinksEelco Dolstra1-9/+16
Also use utimes() instead of utime() if lutimes() is not available.
2012-07-18 Use "#pragma once" to prevent repeated header file inclusionEelco Dolstra9-45/+9
2012-07-17 Add function queryPathFromHashPart()Eelco Dolstra6-0/+46
To implement binary caches efficiently, Hydra needs to be able to map the hash part of a store path (e.g. "gbg...zr7") to the full store path (e.g. "/nix/store/gbg...kzr7-subversion-1.7.5"). (The binary cache mechanism uses hash parts as a key for looking up store paths to ensure privacy.) However, doing a search in the Nix store for /nix/store/<hash>* is expensive since it requires reading the entire directory. queryPathFromHashPart() prevents this by doing a cheap database lookup.
2012-07-17 Return an exit code of 100 for cached failed buildsEelco Dolstra1-0/+1
Exit code 100 should be returned for all permanent failures. This includes cached failures. Fixes #34.
2012-07-17 Update Nix 1.1 release notesEelco Dolstra1-0/+3
2012-07-17 Allow disabling log compressionEelco Dolstra1-12/+25
2012-06-27 nix-store -r: do substitutions in parallelEelco Dolstra6-12/+19
I.e. when multiple non-derivation arguments are passed to ‘nix-store -r’ to be substituted, do them in parallel.
2012-06-27 Mount an empty /dev/shm tmpfs in the chrootEelco Dolstra1-0/+6
This ensures that whatever the builder writes in /dev/shm is automatically cleaned up.
2012-06-27 Check the return code of the clone() callEelco Dolstra1-1/+2
2012-06-25 When using chroots, use a private PID namespaceEelco Dolstra1-154/+181
In a private PID namespace, processes have PIDs that are separate from the rest of the system. The initial child gets PID 1. Processes in the chroot cannot see processes outside of the chroot. This improves isolation between builds. However, processes on the outside can see processes in the chroot and send signals to them (if they have appropriate rights). Since the builder gets PID 1, it serves as the reaper for zombies in the chroot. This might turn out to be a problem. In that case we'll need to have a small PID 1 process that sits in a loop calling wait().
2012-06-25 Use a private UTS namespace to provide a deterministic host/domain name to ↵Eelco Dolstra1-1/+7
builders In chroot builds, set the host name to "localhost" and the domain name to "(none)" (the latter being the kernel's default). This improves determinism a bit further. P.S. I have to idea what UTS stands for.
2012-06-23 Improve error messageEelco Dolstra1-1/+1
2012-06-23 In chroot builds, use a private SysV IPC namespaceEelco Dolstra1-12/+19
This improves isolation a bit further, and it's just one extra flag in the unshare() call. P.S. It would be very cool to use CLONE_NEWPID (to put the builder in a private PID namespace) as well, but that's slightly more risky since having a builder start as PID 1 may cause problems.
2012-06-23 In chroot builds, use a private network namespaceEelco Dolstra1-6/+31
On Linux it's possible to run a process in its own network namespace, meaning that it gets its own set of network interfaces, disjunct from the rest of the system. We use this to completely remove network access to chroot builds, except that they get a private loopback interface. This means that: - Builders cannot connect to the outside network or to other processes on the same machine, except processes within the same build. - Vice versa, other processes cannot connect to processes in a chroot build, and open ports/connections do not show up in "netstat". - If two concurrent builders try to listen on the same port (e.g. as part of a test), they no longer conflict with each other. This was inspired by the "PrivateNetwork" flag in systemd.
2012-05-30 Compress build logs on the fly using bzip2Eelco Dolstra2-11/+45
2012-05-29 Reserve some disk space for the garbage collectorEelco Dolstra7-9/+29
We can't open a SQLite database if the disk is full. Since this prevents the garbage collector from running when it's most needed, we reserve some dummy space that we can free just before doing a garbage collection. This actually revives some old code from the Berkeley DB days. Fixes #27.
2012-05-29 Add option ‘build-keep-log’ to enable/disable writing of build logsEelco Dolstra1-1/+4
Fixes #26.
2012-04-30 * Add an option ‘build-use-substitutes’, which can be set to ‘false’Eelco Dolstra4-3/+8
to disable use of substitutes; i.e., force building from source. Fixes Nix/221.
2012-04-30 Handle EPERM when creating a hard link for the chrootEelco Dolstra1-2/+5
There is a race condition when doing parallel builds with chroots and the immutable bit enabled. One process may call makeImmutable() before the other has called link(), in which case link() will fail with EPERM. We could retry or wrap the operation in a lock, but since this condition is rare and I'm lazy, we just use the existing copy fallback. Fixes #9.
2012-04-23 Merge pull request #2 from viric/masterEelco Dolstra1-0/+6
Again, adding the sync option
2012-04-16 Fix obscure race condition in GC root creationEelco Dolstra1-16/+18
This should fix rare Hydra errors of the form: error: symlinking `/nix/var/nix/gcroots/per-user/hydra/hydra-roots/7sfhs5fdmjxm8sqgcpd0pgcsmz1kq0l0-nixos-iso-0.1pre33785-33795' to `/nix/store/7sfhs5fdmjxm8sqgcpd0pgcsmz1kq0l0-nixos-iso-0.1pre33785-33795': File exists
2012-04-15 Close almost all file descriptors in the builderEelco Dolstra1-0/+3
This regression was accidentally introduced in 35355fc1fcffbe859395e360c0a6a1463f137d63.
2012-04-05 On Linux, pretend we're building on Linux 2.6Eelco Dolstra1-0/+11
Setting the UNAME26 personality causes "uname" to return "2.6.x", regardless of the kernel version. This improves determinism in a few misbehaved packages.
2012-03-26 Mac OS X fixEelco Dolstra1-0/+3
2012-03-26 Delete non-directory valid paths right awayEelco Dolstra1-16/+27
It's unlikely that rename() is faster than unlink() on a regular file or symlink, so don't bother.
2012-03-26 Make the garbage collector more concurrentEelco Dolstra3-21/+48
Make the garbage collector more concurrent by deleting valid paths outside the region where we're holding the global GC lock. This should greatly reduce the time during which new builds are blocked, since the deletion accounts for the vast majority of the time spent in the GC. To ensure that this is safe, the valid paths are invalidated and renamed to some arbitrary path while we're holding the lock. This ensures that we when we finally delete the path, it's not a (newly) valid or locked path.
2012-03-26 Remove the --max-links GC optionEelco Dolstra4-17/+2
We don't need this anymore now that current filesystems support more than 32,000 files in a directory.
2012-03-22 Fixing the default of sync-before-registeringLluís Batlle i Rossell1-1/+5
Setting 'false' as default, as suggested by Eelco. I also added a comment about the setting in the code.
2012-03-22 Adding a nix option to sync before registering a path, for non-ext*Lluís Batlle i Rossell1-0/+2
filesystems.
2012-03-20 nix-store --clear-failed-paths: Clear derivation outputsEelco Dolstra1-1/+3
If the argument to ‘nix-store --clear-failed-paths’ is a derivation, then clear the failed state of its outputs.
2012-03-18 Drop the externals directoryEelco Dolstra1-2/+2
Nix now requires SQLite and bzip2 to be pre-installed. SQLite is detected using pkg-config. We required DBD::SQLite anyway, so depending on SQLite is not a big problem. The --with-bzip2, --with-openssl and --with-sqlite flags are gone.
2012-03-13 Ensure that Perl processes delete their entry in the temproots directoryEelco Dolstra1-0/+12
By moving the destructor object to libstore.so, it's also run when download-using-manifests and nix-prefetch-url exit. This prevents them from cluttering /nix/var/nix/temproots with stale files.
2012-03-05 Set the close-on-exec flag on file descriptorsEelco Dolstra3-3/+5
2012-03-05 Don't leak a file descriptor in commonChildInit()Eelco Dolstra1-0/+1
2012-03-05 Restore progress indication during nix-copy-closureEelco Dolstra1-0/+2
2012-03-01 Remove dependency on sqlite3_table_column_metadataEelco Dolstra1-7/+0
Not all SQLite builds have the function sqlite3_table_column_metadata. We were only using it in a schema upgrade check for compatibility with databases that were probably never seen in the wild. So remove it.
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