139 lines
5.6 KiB
Plaintext
139 lines
5.6 KiB
Plaintext
### 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 `gc-reserved-space'
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#
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# This option specifies how much space should be reserved in normal
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# use so that the garbage collector can run succesfully. Since the
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# garbage collector must perform Berkeley DB transactions, it needs
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# some disk space for itself. However, when the disk is full, this
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# space is not available, so the collector would not be able to run
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# precisely when it is most needed.
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#
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# For this reason, when Nix is run, it allocates a file
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# /nix/var/nix/db/reserved of the size specified by this option. When
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# the garbage collector is run, this file is deleted before the
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# Berkeley DB environment is opened. This should give it enough room
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# to proceed.
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#
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# The default is "1048576" (1 MiB).
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#gc-reserved-space = 1048576
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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-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 `system'
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#
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# This option specifies the canonical Nix system name of the current
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# installation, such as `i686-linux' or `powerpc-darwin'. Nix can
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# only build derivations whose `system' attribute equals the value
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# specified here. In general, it never makes sense to modify this
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# value from its default, since you can use it to `lie' about the
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# platform you are building on (e.g., perform a Mac OS build on a
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# Linux machine; the result would obviously be wrong). It only makes
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# sense if the Nix binaries can run on multiple platforms, e.g.,
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# `universal binaries' that run on `powerpc-darwin' and `i686-darwin'.
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#
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# It defaults to the canonical Nix system name detected by `configure'
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# at build time.
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#
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# Example:
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# system = i686-darwin
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#system =
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