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8b7f8b56f1
This patch adds the configuration file variable "build-cores" and the command line argument "--cores". These settings specify the number of CPU cores to utilize for parallel building within a job, i.e. by passing an appropriate "-j" flag to GNU Make. The default value is 1, which means that parallel building is *disabled*. If the number of build cores is specified as 0 (synonymously: "guess" or "auto"), then the actual value is supposed to be auto-detected by builders at run-time, i.e by calling the nproc(1) utility from coreutils. The environment variable $NIX_BUILD_CORES is available to builders, but the contents of that variable does *not* influence the hash that goes into the $out store path, i.e. the number of build cores to be utilized can be changed at will without requiring any re-builds.
182 lines
7.2 KiB
Text
182 lines
7.2 KiB
Text
### Option `gc-keep-outputs'
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#
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# If `true', the garbage collector will keep the outputs of
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# non-garbage derivations. If `false' (default), outputs will be
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# deleted unless they are GC roots themselves (or reachable from other
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# roots).
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#
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# In general, outputs must be registered as roots separately.
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# However, even if the output of a derivation is registered as a root,
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# the collector will still delete store paths that are used only at
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# build time (e.g., the C compiler, or source tarballs downloaded from
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# the network). To prevent it from doing so, set this option to
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# `true'.
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#gc-keep-outputs = false
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### Option `gc-keep-derivations'
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#
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# If `true' (default), the garbage collector will keep the derivations
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# from which non-garbage store paths were built. If `false', they
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# will be deleted unless explicitly registered as a root (or reachable
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# from other roots).
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#
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# Keeping derivation around is useful for querying and traceability
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# (e.g., it allows you to ask with what dependencies or options a
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# store path was built), so by default this option is on. Turn it off
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# to safe a bit of disk space (or a lot if `gc-keep-outputs' is also
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# turned on).
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#gc-keep-derivations = true
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### Option `env-keep-derivations'
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#
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# If `false' (default), derivations are not stored in Nix user
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# environments. That is, the derivation any build-time-only
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# dependencies may be garbage-collected.
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#
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# If `true', when you add a Nix derivation to a user environment, the
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# path of the derivation is stored in the user environment. Thus, the
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# derivation will not be garbage-collected until the user environment
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# generation is deleted (`nix-env --delete-generations'). To prevent
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# build-time-only dependencies from being collected, you should also
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# turn on `gc-keep-outputs'.
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#
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# The difference between this option and `gc-keep-derivations' is that
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# this one is `sticky': it applies to any user environment created
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# while this option was enabled, while `gc-keep-derivations' only
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# applies at the moment the garbage collector is run.
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#env-keep-derivations = false
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### Option `build-max-jobs'
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#
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# This option defines the maximum number of jobs that Nix will try to
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# build in parallel. The default is 1. You should generally set it
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# to the number of CPUs in your system (e.g., 2 on a Athlon 64 X2).
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# It can be overriden using the `--max-jobs' / `-j' command line
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# switch.
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#build-max-jobs = 1
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### Option `build-cores'
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#
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# This option defines the number of CPU cores to utilize in parallel
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# within a build job, i.e. by passing an appropriate `-jN' flag to
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# GNU make. The default is 1, meaning that parallel building within
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# jobs is disabled. Passing the special values `0', `auto', or
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# `guess' causes Nix to try and auto-detect the number of available
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# cores on the local host. This setting can be overridden using the
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# `--cores' command line switch.
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#build-cores = 1
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### Option `build-max-silent-time'
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#
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# This option defines the maximum number of seconds that a builder can
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# go without producing any data on standard output or standard error.
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# This is useful (for instance in a automated build system) to catch
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# builds that are stuck in an infinite loop, or to catch remote builds
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# that are hanging due to network problems. It can be overriden using
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# the `--max-silent-time' command line switch.
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#
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# The value 0 means that there is no timeout. This is also the
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# default.
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#
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# Example:
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# build-max-silent-time = 600 # = 10 minutes
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#build-max-silent-time = 0
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### Option `build-users-group'
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#
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# This options specifies the Unix group containing the Nix build user
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# accounts. In multi-user Nix installations, builds should not
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# be performed by the Nix account since that would allow users to
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# arbitrarily modify the Nix store and database by supplying specially
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# crafted builders; and they cannot be performed by the calling user
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# since that would allow him/her to influence the build result.
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#
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# Therefore, if this option is non-empty and specifies a valid group,
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# builds will be performed under the user accounts that are a member
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# of the group specified here (as listed in /etc/group). Those user
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# accounts should not be used for any other purpose!
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#
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# Nix will never run two builds under the same user account at the
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# same time. This is to prevent an obvious security hole: a malicious
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# user writing a Nix expression that modifies the build result of a
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# legitimate Nix expression being built by another user. Therefore it
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# is good to have as many Nix build user accounts as you can spare.
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# (Remember: uids are cheap.)
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#
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# The build users should have permission to create files in the Nix
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# store, but not delete them. Therefore, /nix/store should be owned
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# by the Nix account, its group should be the group specified here,
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# and its mode should be 1775.
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#
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# If the build users group is empty, builds will be performed under
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# the uid of the Nix process (that is, the uid of the caller if
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# $NIX_REMOTE is empty, the uid under which the Nix daemon runs if
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# $NIX_REMOTE is `daemon', or the uid that owns the setuid nix-worker
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# program if $NIX_REMOTE is `slave'). Obviously, this should not be
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# used in multi-user settings with untrusted users.
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#
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# The default is empty.
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#
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# Example:
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# build-users-group = nix-builders
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#build-users-group =
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### Option `build-use-chroot'
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#
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# If set to `true', builds will be performed in a chroot environment,
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# i.e., the build will be isolated from the normal file system
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# hierarchy and will only see the Nix store, the temporary build
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# directory, and the directories configured with the
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# `build-chroot-dirs' option (such as /proc and /dev). This is useful
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# to prevent undeclared dependencies on files in directories such as
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# /usr/bin.
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#
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# The use of a chroot requires that Nix is run as root (but you can
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# still use the "build users" feature to perform builds under
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# different users than root). Currently, chroot builds only work on
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# Linux because Nix uses "bind mounts" to make the Nix store and other
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# directories available inside the chroot.
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#
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# The default is `false'.
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#
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# Example:
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# build-use-chroot = true
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#build-use-chroot = false
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### Option `build-chroot-dirs'
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#
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# When builds are performed in a chroot environment, Nix will mount
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# (using `mount --bind' on Linux) some directories from the normal
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# file system hierarchy inside the chroot. These are the Nix store,
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# the temporary build directory (usually /tmp/nix-<pid>-<number>) and
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# the directories listed here. The default is "/dev /dev/pts /proc".
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# Files in /dev (such as /dev/null) are needed by many builds, and
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# some files in /proc may also be needed occasionally.
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#
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# Example:
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# build-use-chroot = /dev /proc /bin
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#build-chroot-dirs = /dev /dev/pts /proc
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### Option `build-cache-failure'
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#
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# If this option is enabled, Nix will do negative caching; that is, it
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# will remember failed builds, and won't attempt to try to build them
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# again if you ask for it. Negative caching is disabled by default
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# because Nix cannot distinguish between permanent build errors (e.g.,
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# a syntax error in a source file) and transient build errors (e.g., a
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# full disk), as they both cause the builder to return a non-zero exit
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# code. You can clear the cache by doing `rm -f
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# /nix/var/nix/db/failed/*'.
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#
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# Example:
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# build-cache-failure = true
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#build-cache-failure = false
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