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GNU General Public License # GNU General Public License
==========================
_Version 3, 29 June 2007_ _Version 3, 29 June 2007_ _Copyright © 2007 Free Software Foundation, Inc.
_Copyright © 2007 Free Software Foundation, Inc. &lt;<http://fsf.org/>&gt;_ &lt;<http://fsf.org/>&gt;_
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## Preamble ## Preamble
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## TERMS AND CONDITIONS ## TERMS AND CONDITIONS
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### 6. Conveying Non-Source Forms ### 6. Conveying Non-Source Forms
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### 7. Additional Terms ### 7. Additional Terms
“Additional permissions” are terms that supplement the terms of this “Additional permissions” are terms that supplement the terms of this License by
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When you convey a copy of a covered work, you may at your option remove any When you convey a copy of a covered work, you may at your option remove any
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* **c)** Prohibiting misrepresentation of the origin of that material, or requiring that - **c)** Prohibiting misrepresentation of the origin of that material, or
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* **d)** Limiting the use for publicity purposes of names of licensors or authors of the - **d)** Limiting the use for publicity purposes of names of licensors or
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* **e)** Declining to grant rights under trademark law for use of some trade names, - **e)** Declining to grant rights under trademark law for use of some trade
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* **f)** Requiring indemnification of licensors and authors of that material by anyone - **f)** Requiring indemnification of licensors and authors of that material by
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All other non-permissive additional terms are considered “further All other non-permissive additional terms are considered “further restrictions”
restrictions” within the meaning of section 10. If the Program as you received within the meaning of section 10. If the Program as you received it, or any part
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along with a term that is a further restriction, you may remove that term. If a a term that is a further restriction, you may remove that term. If a license
license document contains a further restriction but permits relicensing or conveying document contains a further restriction but permits relicensing or conveying
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If you add terms to a covered work in accord with this section, you must place, in If you add terms to a covered work in accord with this section, you must place,
the relevant source files, a statement of the additional terms that apply to those in the relevant source files, a statement of the additional terms that apply to
files, or a notice indicating where to find the applicable terms. those files, or a notice indicating where to find the applicable terms.
Additional terms, permissive or non-permissive, may be stated in the form of a Additional terms, permissive or non-permissive, may be stated in the form of a
separately written license, or stated as exceptions; the above requirements apply separately written license, or stated as exceptions; the above requirements
either way. apply either way.
### 8. Termination ### 8. Termination
You may not propagate or modify a covered work except as expressly provided under You may not propagate or modify a covered work except as expressly provided
this License. Any attempt otherwise to propagate or modify it is void, and will under this License. Any attempt otherwise to propagate or modify it is void, and
automatically terminate your rights under this License (including any patent licenses will automatically terminate your rights under this License (including any
granted under the third paragraph of section 11). patent licenses granted under the third paragraph of section 11).
However, if you cease all violation of this License, then your license from a However, if you cease all violation of this License, then your license from a
particular copyright holder is reinstated **(a)** provisionally, unless and until the particular copyright holder is reinstated **(a)** provisionally, unless and
copyright holder explicitly and finally terminates your license, and **(b)** permanently, until the copyright holder explicitly and finally terminates your license, and
if the copyright holder fails to notify you of the violation by some reasonable means **(b)** permanently, if the copyright holder fails to notify you of the
prior to 60 days after the cessation. violation by some reasonable means prior to 60 days after the cessation.
Moreover, your license from a particular copyright holder is reinstated permanently Moreover, your license from a particular copyright holder is reinstated
if the copyright holder notifies you of the violation by some reasonable means, this permanently if the copyright holder notifies you of the violation by some
is the first time you have received notice of violation of this License (for any reasonable means, this is the first time you have received notice of violation
work) from that copyright holder, and you cure the violation prior to 30 days after of this License (for any work) from that copyright holder, and you cure the
your receipt of the notice. violation prior to 30 days after your receipt of the notice.
Termination of your rights under this section does not terminate the licenses of Termination of your rights under this section does not terminate the licenses of
parties who have received copies or rights from you under this License. If your parties who have received copies or rights from you under this License. If your
rights have been terminated and not permanently reinstated, you do not qualify to rights have been terminated and not permanently reinstated, you do not qualify
receive new licenses for the same material under section 10. to receive new licenses for the same material under section 10.
### 9. Acceptance Not Required for Having Copies ### 9. Acceptance Not Required for Having Copies
You are not required to accept this License in order to receive or run a copy of the You are not required to accept this License in order to receive or run a copy of
Program. Ancillary propagation of a covered work occurring solely as a consequence of the Program. Ancillary propagation of a covered work occurring solely as a
using peer-to-peer transmission to receive a copy likewise does not require consequence of using peer-to-peer transmission to receive a copy likewise does
acceptance. However, nothing other than this License grants you permission to not require acceptance. However, nothing other than this License grants you
propagate or modify any covered work. These actions infringe copyright if you do not permission to propagate or modify any covered work. These actions infringe
accept this License. Therefore, by modifying or propagating a covered work, you copyright if you do not accept this License. Therefore, by modifying or
indicate your acceptance of this License to do so. propagating a covered work, you indicate your acceptance of this License to do
so.
### 10. Automatic Licensing of Downstream Recipients ### 10. Automatic Licensing of Downstream Recipients
Each time you convey a covered work, the recipient automatically receives a license Each time you convey a covered work, the recipient automatically receives a
from the original licensors, to run, modify and propagate that work, subject to this license from the original licensors, to run, modify and propagate that work,
License. You are not responsible for enforcing compliance by third parties with this subject to this License. You are not responsible for enforcing compliance by
License. third parties with this License.
An “entity transaction” is a transaction transferring control of an An “entity transaction” is a transaction transferring control of an
organization, or substantially all assets of one, or subdividing an organization, or organization, or substantially all assets of one, or subdividing an
merging organizations. If propagation of a covered work results from an entity organization, or merging organizations. If propagation of a covered work results
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receives whatever licenses to the work the party's predecessor in interest had or of the work also receives whatever licenses to the work the party's predecessor
could give under the previous paragraph, plus a right to possession of the in interest had or could give under the previous paragraph, plus a right to
Corresponding Source of the work from the predecessor in interest, if the predecessor possession of the Corresponding Source of the work from the predecessor in
has it or can get it with reasonable efforts. interest, if the predecessor has it or can get it with reasonable efforts.
You may not impose any further restrictions on the exercise of the rights granted or You may not impose any further restrictions on the exercise of the rights
affirmed under this License. For example, you may not impose a license fee, royalty, granted or affirmed under this License. For example, you may not impose a
or other charge for exercise of rights granted under this License, and you may not license fee, royalty, or other charge for exercise of rights granted under this
initiate litigation (including a cross-claim or counterclaim in a lawsuit) alleging License, and you may not initiate litigation (including a cross-claim or
that any patent claim is infringed by making, using, selling, offering for sale, or counterclaim in a lawsuit) alleging that any patent claim is infringed by
importing the Program or any portion of it. making, using, selling, offering for sale, or importing the Program or any
portion of it.
### 11. Patents ### 11. Patents
A “contributor” is a copyright holder who authorizes use under this A “contributor” is a copyright holder who authorizes use under this License of
License of the Program or a work on which the Program is based. The work thus the Program or a work on which the Program is based. The work thus licensed is
licensed is called the contributor's “contributor version”. called the contributor's “contributor version”.
A contributor's “essential patent claims” are all patent claims owned or A contributor's “essential patent claims” are all patent claims owned or
controlled by the contributor, whether already acquired or hereafter acquired, that controlled by the contributor, whether already acquired or hereafter acquired,
would be infringed by some manner, permitted by this License, of making, using, or that would be infringed by some manner, permitted by this License, of making,
selling its contributor version, but do not include claims that would be infringed using, or selling its contributor version, but do not include claims that would
only as a consequence of further modification of the contributor version. For be infringed only as a consequence of further modification of the contributor
purposes of this definition, “control” includes the right to grant patent version. For purposes of this definition, “control” includes the right to grant
sublicenses in a manner consistent with the requirements of this License. patent sublicenses in a manner consistent with the requirements of this License.
Each contributor grants you a non-exclusive, worldwide, royalty-free patent license Each contributor grants you a non-exclusive, worldwide, royalty-free patent
under the contributor's essential patent claims, to make, use, sell, offer for sale, license under the contributor's essential patent claims, to make, use, sell,
import and otherwise run, modify and propagate the contents of its contributor offer for sale, import and otherwise run, modify and propagate the contents of
version. its contributor version.
In the following three paragraphs, a “patent license” is any express In the following three paragraphs, a “patent license” is any express agreement
agreement or commitment, however denominated, not to enforce a patent (such as an or commitment, however denominated, not to enforce a patent (such as an express
express permission to practice a patent or covenant not to sue for patent permission to practice a patent or covenant not to sue for patent infringement).
infringement). To “grant” such a patent license to a party means to make To “grant” such a patent license to a party means to make such an agreement or
such an agreement or commitment not to enforce a patent against the party. commitment not to enforce a patent against the party.
If you convey a covered work, knowingly relying on a patent license, and the If you convey a covered work, knowingly relying on a patent license, and the
Corresponding Source of the work is not available for anyone to copy, free of charge Corresponding Source of the work is not available for anyone to copy, free of
and under the terms of this License, through a publicly available network server or charge and under the terms of this License, through a publicly available network
other readily accessible means, then you must either **(1)** cause the Corresponding server or other readily accessible means, then you must either **(1)** cause the
Source to be so available, or **(2)** arrange to deprive yourself of the benefit of the Corresponding Source to be so available, or **(2)** arrange to deprive yourself
patent license for this particular work, or **(3)** arrange, in a manner consistent with of the benefit of the patent license for this particular work, or **(3)**
the requirements of this License, to extend the patent license to downstream arrange, in a manner consistent with the requirements of this License, to extend
recipients. “Knowingly relying” means you have actual knowledge that, but the patent license to downstream recipients. “Knowingly relying” means you have
for the patent license, your conveying the covered work in a country, or your actual knowledge that, but for the patent license, your conveying the covered
recipient's use of the covered work in a country, would infringe one or more work in a country, or your recipient's use of the covered work in a country,
identifiable patents in that country that you have reason to believe are valid. would infringe one or more identifiable patents in that country that you have
reason to believe are valid.
If, pursuant to or in connection with a single transaction or arrangement, you If, pursuant to or in connection with a single transaction or arrangement, you
convey, or propagate by procuring conveyance of, a covered work, and grant a patent convey, or propagate by procuring conveyance of, a covered work, and grant a
license to some of the parties receiving the covered work authorizing them to use, patent license to some of the parties receiving the covered work authorizing
propagate, modify or convey a specific copy of the covered work, then the patent them to use, propagate, modify or convey a specific copy of the covered work,
license you grant is automatically extended to all recipients of the covered work and then the patent license you grant is automatically extended to all recipients of
works based on it. the covered work and works based on it.
A patent license is “discriminatory” if it does not include within the A patent license is “discriminatory” if it does not include within the scope of
scope of its coverage, prohibits the exercise of, or is conditioned on the its coverage, prohibits the exercise of, or is conditioned on the non-exercise
non-exercise of one or more of the rights that are specifically granted under this of one or more of the rights that are specifically granted under this License.
License. You may not convey a covered work if you are a party to an arrangement with You may not convey a covered work if you are a party to an arrangement with a
a third party that is in the business of distributing software, under which you make third party that is in the business of distributing software, under which you
payment to the third party based on the extent of your activity of conveying the make payment to the third party based on the extent of your activity of
work, and under which the third party grants, to any of the parties who would receive conveying the work, and under which the third party grants, to any of the
the covered work from you, a discriminatory patent license **(a)** in connection with parties who would receive the covered work from you, a discriminatory patent
copies of the covered work conveyed by you (or copies made from those copies), or **(b)** license **(a)** in connection with copies of the covered work conveyed by you
primarily for and in connection with specific products or compilations that contain (or copies made from those copies), or **(b)** primarily for and in connection
the covered work, unless you entered into that arrangement, or that patent license with specific products or compilations that contain the covered work, unless you
was granted, prior to 28 March 2007. entered into that arrangement, or that patent license was granted, prior to 28
March 2007.
Nothing in this License shall be construed as excluding or limiting any implied Nothing in this License shall be construed as excluding or limiting any implied
license or other defenses to infringement that may otherwise be available to you license or other defenses to infringement that may otherwise be available to you
@ -470,51 +485,55 @@ under applicable patent law.
### 12. No Surrender of Others' Freedom ### 12. No Surrender of Others' Freedom
If conditions are imposed on you (whether by court order, agreement or otherwise) If conditions are imposed on you (whether by court order, agreement or
that contradict the conditions of this License, they do not excuse you from the otherwise) that contradict the conditions of this License, they do not excuse
conditions of this License. If you cannot convey a covered work so as to satisfy you from the conditions of this License. If you cannot convey a covered work so
simultaneously your obligations under this License and any other pertinent as to satisfy simultaneously your obligations under this License and any other
obligations, then as a consequence you may not convey it at all. For example, if you pertinent obligations, then as a consequence you may not convey it at all. For
agree to terms that obligate you to collect a royalty for further conveying from example, if you agree to terms that obligate you to collect a royalty for
those to whom you convey the Program, the only way you could satisfy both those terms further conveying from those to whom you convey the Program, the only way you
and this License would be to refrain entirely from conveying the Program. could satisfy both those terms and this License would be to refrain entirely
from conveying the Program.
### 13. Use with the GNU Affero General Public License ### 13. Use with the GNU Affero General Public License
Notwithstanding any other provision of this License, you have permission to link or Notwithstanding any other provision of this License, you have permission to link
combine any covered work with a work licensed under version 3 of the GNU Affero or combine any covered work with a work licensed under version 3 of the GNU
General Public License into a single combined work, and to convey the resulting work. Affero General Public License into a single combined work, and to convey the
The terms of this License will continue to apply to the part which is the covered resulting work. The terms of this License will continue to apply to the part
work, but the special requirements of the GNU Affero General Public License, section which is the covered work, but the special requirements of the GNU Affero
13, concerning interaction through a network will apply to the combination as such. General Public License, section 13, concerning interaction through a network
will apply to the combination as such.
### 14. Revised Versions of this License ### 14. Revised Versions of this License
The Free Software Foundation may publish revised and/or new versions of the GNU The Free Software Foundation may publish revised and/or new versions of the GNU
General Public License from time to time. Such new versions will be similar in spirit General Public License from time to time. Such new versions will be similar in
to the present version, but may differ in detail to address new problems or concerns. spirit to the present version, but may differ in detail to address new problems
or concerns.
Each version is given a distinguishing version number. If the Program specifies that Each version is given a distinguishing version number. If the Program specifies
a certain numbered version of the GNU General Public License “or any later that a certain numbered version of the GNU General Public License “or any later
version” applies to it, you have the option of following the terms and version” applies to it, you have the option of following the terms and
conditions either of that numbered version or of any later version published by the conditions either of that numbered version or of any later version published by
Free Software Foundation. If the Program does not specify a version number of the GNU the Free Software Foundation. If the Program does not specify a version number
General Public License, you may choose any version ever published by the Free of the GNU General Public License, you may choose any version ever published by
Software Foundation. the Free Software Foundation.
If the Program specifies that a proxy can decide which future versions of the GNU If the Program specifies that a proxy can decide which future versions of the
General Public License can be used, that proxy's public statement of acceptance of a GNU General Public License can be used, that proxy's public statement of
version permanently authorizes you to choose that version for the Program. acceptance of a version permanently authorizes you to choose that version for
the Program.
Later license versions may give you additional or different permissions. However, no Later license versions may give you additional or different permissions.
additional obligations are imposed on any author or copyright holder as a result of However, no additional obligations are imposed on any author or copyright holder
your choosing to follow a later version. as a result of your choosing to follow a later version.
### 15. Disclaimer of Warranty ### 15. Disclaimer of Warranty
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER
PROVIDE THE PROGRAM “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER PARTIES PROVIDE THE PROGRAM “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER
EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE
QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE
@ -525,32 +544,32 @@ DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY
COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM AS COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM AS
PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL,
INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE
PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED
OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE
WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY
POSSIBILITY OF SUCH DAMAGES. HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
### 17. Interpretation of Sections 15 and 16 ### 17. Interpretation of Sections 15 and 16
If the disclaimer of warranty and limitation of liability provided above cannot be If the disclaimer of warranty and limitation of liability provided above cannot
given local legal effect according to their terms, reviewing courts shall apply local be given local legal effect according to their terms, reviewing courts shall
law that most closely approximates an absolute waiver of all civil liability in apply local law that most closely approximates an absolute waiver of all civil
connection with the Program, unless a warranty or assumption of liability accompanies liability in connection with the Program, unless a warranty or assumption of
a copy of the Program in return for a fee. liability accompanies a copy of the Program in return for a fee.
_END OF TERMS AND CONDITIONS_ _END OF TERMS AND CONDITIONS_
## How to Apply These Terms to Your New Programs ## How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest possible use to If you develop a new program, and you want it to be of the greatest possible use
the public, the best way to achieve this is to make it free software which everyone to the public, the best way to achieve this is to make it free software which
can redistribute and change under these terms. everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest to attach them To do so, attach the following notices to the program. It is safest to attach
to the start of each source file to most effectively state the exclusion of warranty; them to the start of each source file to most effectively state the exclusion of
and each file should have at least the “copyright” line and a pointer to warranty; and each file should have at least the “copyright” line and a pointer
where the full notice is found. to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.> <one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author> Copyright (C) <year> <name of author>
@ -570,26 +589,26 @@ where the full notice is found.
Also add information on how to contact you by electronic and paper mail. Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short notice like this If the program does terminal interaction, make it output a short notice like
when it starts in an interactive mode: this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author> <program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type 'show w'. This program comes with ABSOLUTELY NO WARRANTY; for details type 'show w'.
This is free software, and you are welcome to redistribute it This is free software, and you are welcome to redistribute it
under certain conditions; type 'show c' for details. under certain conditions; type 'show c' for details.
The hypothetical commands `show w` and `show c` should show the appropriate parts of The hypothetical commands `show w` and `show c` should show the appropriate
the General Public License. Of course, your program's commands might be different; parts of the General Public License. Of course, your program's commands might be
for a GUI interface, you would use an “about box”. different; for a GUI interface, you would use an “about box”.
You should also get your employer (if you work as a programmer) or school, if any, to You should also get your employer (if you work as a programmer) or school, if
sign a “copyright disclaimer” for the program, if necessary. For more any, to sign a “copyright disclaimer” for the program, if necessary. For more
information on this, and how to apply and follow the GNU GPL, see information on this, and how to apply and follow the GNU GPL, see
&lt;<http://www.gnu.org/licenses/>&gt;. &lt;<http://www.gnu.org/licenses/>&gt;.
The GNU General Public License does not permit incorporating your program into The GNU General Public License does not permit incorporating your program into
proprietary programs. If your program is a subroutine library, you may consider it proprietary programs. If your program is a subroutine library, you may consider
more useful to permit linking proprietary applications with the library. If this is it more useful to permit linking proprietary applications with the library. If
what you want to do, use the GNU Lesser General Public License instead of this this is what you want to do, use the GNU Lesser General Public License instead
License. But first, please read of this License. But first, please read
&lt;<http://www.gnu.org/philosophy/why-not-lgpl.html>&gt;. &lt;<http://www.gnu.org/philosophy/why-not-lgpl.html>&gt;.

64
README.md
View file

@ -1,25 +1,27 @@
# nix-eval-jobs # nix-eval-jobs
This project evaluates nix attribute sets in parallel with streamable json This project evaluates nix attribute sets in parallel with streamable json
output. This is useful for time and memory intensive evaluations such as NixOS output. This is useful for time and memory intensive evaluations such as NixOS
machines, i.e. in a CI context. The evaluation is done with a controllable machines, i.e. in a CI context. The evaluation is done with a controllable
number of threads that are restarted when their memory consumption exceeds a number of threads that are restarted when their memory consumption exceeds a
certain threshold. certain threshold.
To facilitate integration, nix-eval-jobs creates garbage collection roots for To facilitate integration, nix-eval-jobs creates garbage collection roots for
each evaluated derivation (drv file, not the build) within the provided each evaluated derivation (drv file, not the build) within the provided
attribute. This prevents race conditions between the nix garbage collection attribute. This prevents race conditions between the nix garbage collection
service and user-started nix builds processes. service and user-started nix builds processes.
## Why using nix-eval-jobs? ## Why using nix-eval-jobs?
- Faster evaluation by using threads - Faster evaluation by using threads
- Memory used for evaluation is reclaimed after nix-eval-jobs finish, so that the build can use it. - Memory used for evaluation is reclaimed after nix-eval-jobs finish, so that
the build can use it.
- Evaluation of jobs can fail individually - Evaluation of jobs can fail individually
## Example ## Example
In the following example we evaluate the hydraJobs attribute of the [patchelf](https://github.com/NixOS/patchelf) flake: In the following example we evaluate the hydraJobs attribute of the
[patchelf](https://github.com/NixOS/patchelf) flake:
```console ```console
$ nix-eval-jobs --gc-roots-dir gcroot --flake 'github:NixOS/patchelf#hydraJobs' $ nix-eval-jobs --gc-roots-dir gcroot --flake 'github:NixOS/patchelf#hydraJobs'
@ -30,11 +32,12 @@ $ nix-eval-jobs --gc-roots-dir gcroot --flake 'github:NixOS/patchelf#hydraJobs'
The output here is newline-seperated json according to https://jsonlines.org. The output here is newline-seperated json according to https://jsonlines.org.
The code is derived from [hydra's](https://github.com/nixos/hydra) eval-jobs executable. The code is derived from [hydra's](https://github.com/nixos/hydra) eval-jobs
executable.
## Further options ## Further options
``` console ```console
$ nix-eval-jobs --help $ nix-eval-jobs --help
USAGE: nix-eval-jobs [options] expr USAGE: nix-eval-jobs [options] expr
@ -60,11 +63,10 @@ USAGE: nix-eval-jobs [options] expr
--workers number of evaluate workers --workers number of evaluate workers
``` ```
## Potential use-cases for the tool ## Potential use-cases for the tool
**Faster evaluator in deployment tools.** When evaluating NixOS machines, **Faster evaluator in deployment tools.** When evaluating NixOS machines,
evaluation can take several minutes when run on a single core. This limits evaluation can take several minutes when run on a single core. This limits
scalability for large deployments with deployment tools such as scalability for large deployments with deployment tools such as
[NixOps](https://github.com/NixOS/nixops). [NixOps](https://github.com/NixOS/nixops).
@ -77,7 +79,6 @@ single large log file. In the
[wiki](https://github.com/nix-community/nix-eval-jobs/wiki#ci-example-configurations) [wiki](https://github.com/nix-community/nix-eval-jobs/wiki#ci-example-configurations)
we collect example ci configuration for various CIs. we collect example ci configuration for various CIs.
## Organisation of this repository ## Organisation of this repository
On the `main` branch we target nixUnstable. When a release of nix happens, we On the `main` branch we target nixUnstable. When a release of nix happens, we
@ -86,41 +87,44 @@ fork for a release branch i.e. `release-2.8` and change the nix version in
to these release branches. At the time of writing we only intent to support the to these release branches. At the time of writing we only intent to support the
latest release branch. latest release branch.
## Projects using nix-eval-jobs ## Projects using nix-eval-jobs
- [nix-fast-build](https://github.com/Mic92/nix-fast-build) - Combine the power of nix-eval-jobs with nix-output-monitor to speed-up your evaluation and building process - [nix-fast-build](https://github.com/Mic92/nix-fast-build) - Combine the power
- [buildbot-nix](https://github.com/Mic92/buildbot-nix) - A nixos module to make buildbot a proper Nix-CI of nix-eval-jobs with nix-output-monitor to speed-up your evaluation and
- [colmena](https://github.com/zhaofengli/colmena) - A simple, stateless NixOS deployment tool building process
- [robotnix](https://github.com/danielfullmer/robotnix) - Build Android (AOSP) using Nix, used in their [CI](https://github.com/danielfullmer/robotnix/blob/38b80700ee4265c306dcfdcce45056e32ab2973f/.github/workflows/instantiate.yml#L18) - [buildbot-nix](https://github.com/Mic92/buildbot-nix) - A nixos module to make
buildbot a proper Nix-CI
- [colmena](https://github.com/zhaofengli/colmena) - A simple, stateless NixOS
deployment tool
- [robotnix](https://github.com/danielfullmer/robotnix) - Build Android (AOSP)
using Nix, used in their
[CI](https://github.com/danielfullmer/robotnix/blob/38b80700ee4265c306dcfdcce45056e32ab2973f/.github/workflows/instantiate.yml#L18)
## FAQ ## FAQ
### nix-eval-jobs consumes too much memory / is too slow ### nix-eval-jobs consumes too much memory / is too slow
By default, nix-eval-jobs spawns as many worker processes as there are By default, nix-eval-jobs spawns as many worker processes as there are hardware
hardware threads in the system and limits the memory usage for each worker to threads in the system and limits the memory usage for each worker to 4GB.
4GB.
However, keep in mind that each worker process may need to re-evaluate shared However, keep in mind that each worker process may need to re-evaluate shared
dependencies of the attributes, which can introduce some overhead for each dependencies of the attributes, which can introduce some overhead for each
evaluation or cause workers to exceed their memory limit. If you encounter evaluation or cause workers to exceed their memory limit. If you encounter these
these situations, you can tune the following options: situations, you can tune the following options:
`--workers`: This option allows you to set the number of evaluation workers that `--workers`: This option allows you to set the number of evaluation workers that
nix-eval-jobs should spawn. You can increase or decrease this number to nix-eval-jobs should spawn. You can increase or decrease this number to optimize
optimize the evaluation speed and memory usage. For example, if you have a the evaluation speed and memory usage. For example, if you have a system with
system with many CPU cores but limited memory, you may want to reduce the many CPU cores but limited memory, you may want to reduce the number of workers
number of workers to avoid exceeding the memory limit. to avoid exceeding the memory limit.
`--max-memory-size`: This option allows you to adjust the memory limit for each `--max-memory-size`: This option allows you to adjust the memory limit for each
worker process. By default, it's set to 4GiB, but you can increase or decrease worker process. By default, it's set to 4GiB, but you can increase or decrease
this value as needed. For example, if you have a system with a lot of memory this value as needed. For example, if you have a system with a lot of memory and
and want to speed up the evaluation, you may want to increase the memory limit want to speed up the evaluation, you may want to increase the memory limit to
to allow workers to cache more data in memory before getting restarted by allow workers to cache more data in memory before getting restarted by
nix-eval-jobs. nix-eval-jobs. Note that this is not a hard limit and memory usage may rise
Note that this is not a hard limit and memory usage may rise above the limit momentarily above the limit momentarily before the worker process exits.
before the worker process exits.
Overall, tuning these options can help you optimize the performance and memory Overall, tuning these options can help you optimize the performance and memory
usage of nix-eval-jobs to better fit your system and evaluation needs. usage of nix-eval-jobs to better fit your system and evaluation needs.

10
dev/treefmt.nix
View file

@ -1,12 +1,8 @@
{ pkgs, lib, ... }: { { pkgs, ... }: {
# Used to find the project root # Used to find the project root
projectRootFile = "flake.lock"; projectRootFile = "flake.lock";
programs.prettier.enable = true; programs.deno.enable = true;
programs.prettier.package = pkgs.writeShellScriptBin "prettier" ''
export NODE_PATH=${pkgs.nodePackages.prettier-plugin-toml}/lib/node_modules
exec ${pkgs.nodePackages.prettier}/bin/prettier "$@"
'';
programs.clang-format.enable = true; programs.clang-format.enable = true;
@ -32,8 +28,6 @@
clang-format = { }; clang-format = { };
prettier.includes = lib.mkForce [ "*.toml" ];
python = { python = {
command = "sh"; command = "sh";
options = [ options = [