a58868d201 build: Makes rcc output always deterministic (Hennadii Stepanov)
Pull request description:
The Qt Resource Compiler ([rcc](https://doc.qt.io/qt-5/rcc.html)) has a command-line option `--format-version` which has the [default value](https://code.qt.io/cgit/qt/qtbase.git/tree/src/tools/rcc/main.cpp?h=5.12.10#n172) 2.
The only difference from `--format-version 1` is adding a [last modified timestamp](https://code.qt.io/cgit/qt/qtbase.git/tree/src/tools/rcc/rcc.cpp?h=5.12.10#n207) to the output file ([credits](https://github.com/bitcoin/bitcoin/pull/21654#issuecomment-819198228) to **fanquake**). That, in turn, forces us to use `QT_RCC_SOURCE_DATE_OVERRIDE=1` to get deterministic builds (#13732).
This change makes rcc output always deterministic by using `--format-version 1` option that makes usage of the
`QT_RCC_SOURCE_DATE_OVERRIDE` needless.
---
Also it improves interaction with ccache:
On master (f6c44e999b):
```
$ make && make clean && ccache --zero-stats && make && ccache --show-stats
...
cache directory /home/hebasto/.ccache
primary config /home/hebasto/.ccache/ccache.conf
secondary config (readonly) /etc/ccache.conf
stats updated Sun Apr 11 15:45:43 2021
stats zeroed Sun Apr 11 15:45:05 2021
cache hit (direct) 638
cache hit (preprocessed) 0
cache miss 1
cache hit rate 99.84 %
called for link 10
cleanups performed 0
files in cache 20023
cache size 13.2 GB
max cache size 15.0 GB
```
The missed file is always `qt/libbitcoinqt_a-qrc_bitcoin_locale.o`.
With this PR:
```
$ make && make clean && ccache --zero-stats && make && ccache --show-stats
...
cache directory /home/hebasto/.ccache
primary config /home/hebasto/.ccache/ccache.conf
secondary config (readonly) /etc/ccache.conf
stats updated Sun Apr 11 15:28:46 2021
stats zeroed Sun Apr 11 15:28:21 2021
cache hit (direct) 639
cache hit (preprocessed) 0
cache miss 0
cache hit rate 100.00 %
called for link 10
cleanups performed 0
files in cache 20012
cache size 13.2 GB
max cache size 15.0 GB
```
ACKs for top commit:
fanquake:
ACK a58868d201
Tree-SHA512: 52f4a3267f41883d13025c0de79b6da22e92d60c729e01b986935c6812bbfe7fadc40b742bd715bfdf09df94af6838d4fbbe8208c6123f366108e38c8e1121c5
d420e5c1c0 guix-attest: Avoid incomplete sigdirs with ERR traps (Carl Dong)
feda2c8e31 guix: Skip attesting to dist-archive (Carl Dong)
d522d8006b guix: Attest to inputs in inputs.SHA256SUMS (Carl Dong)
f9e2960c01 guix: Construct $OUTDIR in ${DISTSRC}/output (Carl Dong)
022abc85fc guix: Minor quoting fix in libexec/build.sh (Carl Dong)
c83c4fa5b7 guix-attest: Allow skipping GPG signing with NO_SIGN (Carl Dong)
0e1c2e448c guix-attest: Use ascii-armor signatures (Carl Dong)
b5fd89c4c8 guix-attest: Only use cross-platform flags for find+xargs (Carl Dong)
5926432ba6 guix: Add guix-verify script (Carl Dong)
30daf76a97 guix: Add guix-attest script (Carl Dong)
Pull request description:
Adds replacements for `gsign` and `gverify`.
Personally I'm not a big fan of using the word "sign" as it's been used to refer to both codesigning and GPG signing.
ACKs for top commit:
laanwj:
Code review and tested ACK d420e5c1c0
Tree-SHA512: 93d82d201f4596eaea0e3825aa55b013dfb91790e6ccee79893833d37921513d7b4e735f0641103e1e2ea8308abe4cb6218b73160924708802f2e0e3f7f6caf1
The Qt Resource Compiler (rcc) has a command-line option
`--format-version` which has the default value 2.
The only difference from `--format-version 1` is adding a last modified
timestamp to the output file. That, in turn, forces us to use
`QT_RCC_SOURCE_DATE_OVERRIDE=1` to get deterministic builds.
This change makes rcc output always deterministic by using
`--format-version 1` option that makes usage of the
`QT_RCC_SOURCE_DATE_OVERRIDE` needless. Also it improves interaction
with ccache.
Co-authored-by: fanquake <fanquake@gmail.com>
46b025e00d test: add new python linter to check file names and permissions (windsok)
6f6bb3ebc7 test: fix file permissions on various scripts (windsok)
Pull request description:
Adds a new python linter test which tests for correct filenames and file permissions in the repository.
Replaces the existing tests in the `test/lint/lint-filenames.sh` and `test/lint/lint-shebang.sh` linter tests, as well as adding some new and increased testing. This increased coverage is intended to catch issues such as in #21728 and https://github.com/bitcoin/bitcoin/pull/16807/files#r345547050
Summary of tests:
* Checks every file in the repository against an allowed regexp to make sure only lowercase or uppercase alphanumerics (a-zA-Z0-9), underscores (_), hyphens (-), at (@) and dots (.) are used in repository filenames.
* Checks only source files (*.cpp, *.h, *.py, *.sh) against a stricter allowed regexp to make sure only lowercase alphanumerics (a-z0-9), underscores (_), hyphens (-) and dots (.) are used in source code filenames. Additionally there is an exception regexp for directories or files which are excepted from matching this regexp (This should replicate the existing `test/lint/lint-filenames.sh` test)
* Checks all files in the repository match an allowed executable or non-executable file permission octal. Additionally checks that for executable files, the file contains a shebang line.
* Checks that for executable `.py` and `.sh` files, the shebang line used matches an allowable list of shebangs (This should replicate the existing `test/lint/lint-shebang.sh` test)
* Checks every file that contains a shebang line to ensure it has an executable permission
Additionally updates the permissions on various files to comply with the new tests.
Fixes#21729
ACKs for top commit:
practicalswift:
cr re-ACK 46b025e00df40724175735eb5606ac73067cb3b8: patch still looks correct
kiminuo:
code review ACK 46b025e00d if `contrib/gitian-descriptors/assign_DISTNAME` permission change is deemed OK.
laanwj:
Code review ACK 46b025e00d
Tree-SHA512: 1c8201a2cee0d9cbce15652b68cec9a6458a8b493fcd5392f98560aca0b1a12e668baab65a47100f116f626dadc3f591deb47f7368468c6a46c6c712c2533455
7fc5e865b9 test: install lief in CI (fanquake)
955140b326 contrib: consolidate PIE and NX security checks (fanquake)
2aa1631822 contrib: use LIEF in PE symbol checks (fanquake)
e93ac26b85 contrib: use LIEF in macOS symbol checks (fanquake)
a632cbcee5 contrib: use f strings in symbol-check.py (fanquake)
0f5d77c8e4 contrib: add PE PIE check to security checks (fanquake)
8e1f40dd9a contrib: use LIEF for PE security checks (fanquake)
a25b2e965c contrib: use LIEF for macOS security checks (fanquake)
7e7eae7aa8 contrib: use f strings in security-check.py (fanquake)
2e7a9f7ade guix: install LIEF in Guix container (fanquake)
465967b5ef gitian: install LIEF in gitian container (fanquake)
Pull request description:
This PR is a proof of concept for using [LIEF](https://github.com/lief-project/LIEF) for the PE and MACHO symbol and security checks. It replaces our current approach of manually parsing the output of `objdump` & `otool`. If the consensus is that using LIEF is ok, then I also plan on replacing [pixie.py](https://github.com/bitcoin/bitcoin/blob/master/contrib/devtools/pixie.py), and using LIEF for all checks. LIEF for Linux is also currently blocked (on the next release, unless we want to build master) on one change for RISC-V that I [sent upstream](https://github.com/lief-project/LIEF/pull/562).
LIEF is seemingly well maintained, and is the basis for a number of other tools. It also has some very nice documentation; i.e the [Python API for ELF](https://lief.quarkslab.com/doc/latest/api/python/elf.html). It also has many builtins we can take advantage of. i.e [`is_pie`](https://lief.quarkslab.com/doc/latest/api/python/macho.html#lief.MachO.Binary.is_pie), [`has_nx`](https://lief.quarkslab.com/doc/latest/api/python/macho.html#lief.MachO.Binary.has_nx) etc. This means we can [consolidate some of our checks](9c5eeb5484). If/when end up using LIEF for lightning then we can consolidate further, and cleanup these scripts. i.e to not parse the binary inside the checks, but once at the start of the script.
Guix builds:
```bash
# find guix-build-$(git rev-parse --short=12 HEAD)/output/ -type f -print0 | env LC_ALL=C sort -z | xargs -r0 sha256sum
963a08638c46f9a3d75cd4b0c155d1ca091bbeba27167291adcd3dca03fd4c3d guix-build-f51237d94d98/output/aarch64-linux-gnu/bitcoin-f51237d94d98-aarch64-linux-gnu-debug.tar.gz
a3ce927c46b103789a010c41a6ebfafe4548d90ee7d88f2a735c9183b775da5c guix-build-f51237d94d98/output/aarch64-linux-gnu/bitcoin-f51237d94d98-aarch64-linux-gnu.tar.gz
2503ac8901068805d5e7251fd5cfeb7c1f8ba3528bdfcf3aa1e0c40bfd5c1cbc guix-build-f51237d94d98/output/arm-linux-gnueabihf/bitcoin-f51237d94d98-arm-linux-gnueabihf-debug.tar.gz
5798697e58e1788df85aa9e2e4d33fef0456169fcbd2521f13b3b5806ac0d84d guix-build-f51237d94d98/output/arm-linux-gnueabihf/bitcoin-f51237d94d98-arm-linux-gnueabihf.tar.gz
4185adebc6a0abe7241a3cd409a6ab7be031c26f1c4245e30bb5f87eef0925d2 guix-build-f51237d94d98/output/dist-archive/bitcoin-f51237d94d98.tar.gz
9b4b8756c5c84295eb6b61b6b32a07a8d07723fb38aaa8f519b6133935061bda guix-build-f51237d94d98/output/powerpc64-linux-gnu/bitcoin-f51237d94d98-powerpc64-linux-gnu-debug.tar.gz
cbd821aa464a9c16f7979dbec1a5e66939e777a567f55f7081499a8d528d42c5 guix-build-f51237d94d98/output/powerpc64-linux-gnu/bitcoin-f51237d94d98-powerpc64-linux-gnu.tar.gz
abed530a82e97e3cf621c90a13c0881b0e39ccce2a6f42a3ff80de76e2abc5f7 guix-build-f51237d94d98/output/powerpc64le-linux-gnu/bitcoin-f51237d94d98-powerpc64le-linux-gnu-debug.tar.gz
8b6d2bdd8b58ff1f6072bf8693abe3ce773ff3a7d8d2b7218207e69945b9d31b guix-build-f51237d94d98/output/powerpc64le-linux-gnu/bitcoin-f51237d94d98-powerpc64le-linux-gnu.tar.gz
d99cc705032d22ae819975992216899ed960ba25871a05c8789d00b80418511f guix-build-f51237d94d98/output/riscv64-linux-gnu/bitcoin-f51237d94d98-riscv64-linux-gnu-debug.tar.gz
5240ca4f4ef7c62088185224ac319ad9a4a9b40075df10af18d8a6355bca32fb guix-build-f51237d94d98/output/riscv64-linux-gnu/bitcoin-f51237d94d98-riscv64-linux-gnu.tar.gz
adc16eaee4b51e8615ce8b3be9f6c018698237df4ad6e0886cf0d4ab6bc9e5c4 guix-build-f51237d94d98/output/x86_64-apple-darwin18/bitcoin-f51237d94d98-osx-unsigned.dmg
b188af0572ee682d74cc82c7e6e464115205fc130a457cfe19d42ac9ddd267f8 guix-build-f51237d94d98/output/x86_64-apple-darwin18/bitcoin-f51237d94d98-osx-unsigned.tar.gz
e764062fde144e6fb5d6dd776c10fc2daa8d775831f7e43247d17a6c6e060c97 guix-build-f51237d94d98/output/x86_64-apple-darwin18/bitcoin-f51237d94d98-osx64.tar.gz
dab3d26ac94c669140f7329d14e57ef02b0fe92b8a8f9d96c32a416adea0da0f guix-build-f51237d94d98/output/x86_64-linux-gnu/bitcoin-f51237d94d98-x86_64-linux-gnu-debug.tar.gz
ca59d4379fbe2b9a52deebeaf88508e0eda4215f28d319aff0781289dd159712 guix-build-f51237d94d98/output/x86_64-linux-gnu/bitcoin-f51237d94d98-x86_64-linux-gnu.tar.gz
52b7c35321a85c4f6c95bf0e687574454b71ede9bec1c9cf17f37c578c888a94 guix-build-f51237d94d98/output/x86_64-w64-mingw32/bitcoin-f51237d94d98-win-unsigned.tar.gz
a543895a00f8ffb3ba50ca68396d52ad5a18dd8efe38730e0049dd70d283a092 guix-build-f51237d94d98/output/x86_64-w64-mingw32/bitcoin-f51237d94d98-win64-debug.zip
aec050d03c65268a986148500f7341cceb8c5f85287e0e3cde8933ce4b4dee32 guix-build-f51237d94d98/output/x86_64-w64-mingw32/bitcoin-f51237d94d98-win64-setup-unsigned.exe
57ba33ed6ee8d3a885e342471359301473e83037d5442895beb686921a4c50e9 guix-build-f51237d94d98/output/x86_64-w64-mingw32/bitcoin-f51237d94d98-win64.zip
```
Gitian builds:
```bash
# macOS:
2f066e852bdd30ac46e5ecdf7619d19d408035c318a3edf0f1893ec2e25efb69 bitcoin-41a1b3d1b130-osx-unsigned.dmg
8cf8ac4d21740f490262453c330b5f4a5c5b8139dfc1b322efefce3f3b93d1b2 bitcoin-41a1b3d1b130-osx-unsigned.tar.gz
cf1b84efdd9d2588a1ce9513580fb56b38bfafe60e18f8adbeedf03521c6c2b2 bitcoin-41a1b3d1b130-osx64.tar.gz
14995244b0bb3e80e7b79975c9c70fdfb3ee3c04fda3efd5358ce1c4efa3a312 src/bitcoin-41a1b3d1b130.tar.gz
93881069d5e1dc385c08895a7b035a94eb010325afc2776c99b6aafa21096eb8 bitcoin-core-osx-22-res.yml
# Windows:
4d56dd7713121684b7eaa448679c65df2fd0aa5319bf8d12fb6cfa9f0b005cf7 bitcoin-f51237d94d98-win-unsigned.tar.gz
4558f4173152b084bcba25aa1a53c605208a70fe20392141b63cefb476528c85 bitcoin-f51237d94d98-win64-debug.zip
b63feaca010e86d514cfe38d716e3c8a8b8058e4f969b868aaaeb8a8a3d3dc81 bitcoin-f51237d94d98-win64-setup-unsigned.exe
de7d8586cc91ba391fe911853a99d9fd15fc6f9a60f9b91a0447940173aac67a bitcoin-f51237d94d98-win64.zip
4185adebc6a0abe7241a3cd409a6ab7be031c26f1c4245e30bb5f87eef0925d2 src/bitcoin-f51237d94d98.tar.gz
45efaca35b5fad0a04dfd06e44f7c00b990aa91c7bf2faea57e020d3491a6cf0 bitcoin-core-win-22-res.yml
# Linux:
055d646c5f8cf4708008374546176012ff758566a2645a3a01e1a33eab1002fe bitcoin-f51237d94d98-aarch64-linux-gnu-debug.tar.gz
bfc8b0efc36b0474c88546b12d2723c04b4dc629ae311082025c7e0b8f0d1aa9 bitcoin-f51237d94d98-aarch64-linux-gnu.tar.gz
9dfaa5acfffadad8942b32996458013a155d12ed07be76601f232233627b5cb9 bitcoin-f51237d94d98-arm-linux-gnueabihf-debug.tar.gz
54eb57905ff8513b9f628707b61aa4659c362fb2f6d17e0ee240b4da3674907d bitcoin-f51237d94d98-arm-linux-gnueabihf.tar.gz
ad98d876616eff578ad8cfd17dfbabe48ed14200823579687d66694bae3d2fe3 bitcoin-f51237d94d98-powerpc64-linux-gnu-debug.tar.gz
fe1b421dd1cb6e04d5dc5d341459dc15fa6e15b80906e5d8e0405cf43495e0f7 bitcoin-f51237d94d98-powerpc64-linux-gnu.tar.gz
9001d95cc7d2722d9d7dd83d9da8e5adf575fddf91b615b76b9bcfece30ecf6f bitcoin-f51237d94d98-powerpc64le-linux-gnu-debug.tar.gz
9e0650ad2aba70c0fd1608a077e95f335dc1bb4a79eab9b0b56ac87427a4fd4f bitcoin-f51237d94d98-powerpc64le-linux-gnu.tar.gz
fbfde0134944d3dbd32991455b0a8abdd334853ab8a4c1a1a4c060d9de071c50 bitcoin-f51237d94d98-riscv64-linux-gnu-debug.tar.gz
2fa2cfddce98c44c65305326fc623a7f065129208337503d813a08d51580cb8a bitcoin-f51237d94d98-riscv64-linux-gnu.tar.gz
b2d6caeee0e3c350a43165c39876ebed8e588958007af0d06996e341c7060683 bitcoin-f51237d94d98-x86_64-linux-gnu-debug.tar.gz
bfdb827e75d43d61462513c9a843620b93c9160d9d246cad13278baaa07f64ea bitcoin-f51237d94d98-x86_64-linux-gnu.tar.gz
4185adebc6a0abe7241a3cd409a6ab7be031c26f1c4245e30bb5f87eef0925d2 src/bitcoin-f51237d94d98.tar.gz
34820a093916fa35b0fd98806a50092f46b20271af7422f43e2a4223ef6f9bb7 bitcoin-core-linux-22-res.yml
```
ACKs for top commit:
laanwj:
re-ACK 7fc5e865b9
Tree-SHA512: 0c30838413448ecfcf55e6273f607fdb01cb1acafa1d2762afad59360fca7d8efa78ec55064f50cba56cb2c9e98741e13665cba8e9b4b8e5b62b8a53f9bf8990
We already attest to the relevant dist-archive in inputs.SHA256SUMS,
which is recorded at build-time.
We use a SKIPATTEST.TAG file to indicate output directories which do not
require attestation (much like the CACHEDIR.TAG specification).
Generally, it's better to have build scripts declare properties of
directories instead of introducing name-based special cases in attest
scripts since build scripts have a more detailed context of what is
going on.
At build/codesigning-time, hash build inputs and output the digest to
${OUTDIR}/inputs.SHA256SUMS, which gets included in the final SHA256SUMS
constructed by guix-attest.
Example final SHA256SUMS:
ee832d2a35b7701bff581dea05a536118b118e3ad0a587a2855b6ee8cd6fba20 inputs/bitcoin-78199266af7b.tar.gz
ca765e70a0c12866dd63c0be228b675278a26329e5f8f5b5c52fd09200fedf21 bitcoin-78199266af7b-powerpc64le-linux-gnu-debug.tar.gz
dae95327d7f2c324e2728c4b73627be6cb2c0d2f2e5bea940d1d5e6463939327 bitcoin-78199266af7b-powerpc64le-linux-gnu.tar.gz
While files are being output to $OUTDIR, it will be under
${DISTSRC}/output, and only when everything is done, will
${DISTSRC}/output be moved to the actual $OUTDIR.
This makes it so that a Ctrl-C in the middle of a build is less likely
to result in a partially-constructed $OUTDIR. In fact, if I understand
correctly, if $OUTDIR and $DISTSRC reside on the same filesystem, the
move (rename) is likely atomic.
Also, since the "working $OUTDIR" is under ${DISTSRC}/output, it will be
cleaned properly by the guix-clean script.
c799a19b4b build, qt: No longer need to set QT_RCC_TEST=1 for determinism (Hennadii Stepanov)
Pull request description:
The Qt Resource Compiler (rcc) output order relies on [`QHash`](https://doc.qt.io/qt-5/qhash.html):
> This randomization of `QHash` is enabled by default. Even though programs should never depend on a particular `QHash` ordering, there may be situations where you temporarily need deterministic behavior, for example for debugging or regression testing. To disable the randomization, define the environment variable `QT_HASH_SEED` to have the value 0.
Since #3620 we use `QT_RCC_TEST=1` to achieve a deterministic output.
Since Qt 5.3.1 hash seeding is disabled for all of the bootstrapped tools, including rcc. Therefore, `QT_RCC_TEST=1` is no longer needed.
See commit [5283a6c87beac5a43f612786fefd6e43f2c70bf6](5283a6c87b).
ACKs for top commit:
fanquake:
ACK c799a19b4b
Tree-SHA512: 9d116ac1e8c605ee3e8ed7f618586f0de85d8b06bbbb70fe8c298939ce203d2a7e97264a9afac037179993ab54c5f69a65ebb9ab27ca7f45acb963011bd45743
Passing ADDITIONAL_GUIX_COMMON_FLAGS="--no-substitutes --bootstrap" as
suggested doesn't work:
```bash
...outputting in: '/bitcoin/guix-build-a1f0b8b62eb8/output/x86_64-linux-gnu'
...bind-mounted in container to: '/outdir-base/x86_64-linux-gnu'
guix time-machine: error: bootstrap: unrecognized option
```
and I think bootstrapping is more than covered in the preceding "Choose
your security model" section.
867a5e172a guix: Register garbage collector root for containers (Carl Dong)
8f8b96fb54 guix: Update hint messages to mention guix-clean (Carl Dong)
44f6d4f56b guix: Record precious directories and add guix-clean (Carl Dong)
84912d4b24 build: Remove spaces from variable-printing rules (Carl Dong)
Pull request description:
```
guix: Record precious directories and add guix-clean
Many users have reported problems that stem from having an unclean
working tree. To that end, I've written a guix-clean script which should
help reset the working tree while respecting user-specified precious
directories.
Precious directories, such as:
- SOURCES_PATH
- BASE_CACHE
- SDK_PATH
- OUTDIR
Should be preserved when cleaning the working tree, and are thus
recorded in ./contrib/guix/var/precious_dirs.
The ./contrib/guix/guix-clean script is able to parse that file and make
sure to avoid them when cleaning out the working tree.
```
ACKs for top commit:
laanwj:
ACK 867a5e172a
Tree-SHA512: c498fad781ff5e6406639df2b91b687fc528273fdf266bcdba8f6eec3b3b37ecce544b6da0252f0b9c6717f9d88e844e4c7b72d1877bdbabfc6871ddd0172af5
By registering the container profiles as garbage collector roots, it
will prevent `guix gc` from garbage collecting derivations which our
container needs and inconvieniencing the user with a rebuild.
Many users have reported problems that stem from having an unclean
working tree. To that end, I've written a guix-clean script which should
help reset the working tree while respecting user-specified precious
directories.
Precious directories, such as:
- SOURCES_PATH
- BASE_CACHE
- SDK_PATH
- OUTDIR
Should be preserved when cleaning the working tree, and are thus
recorded in ./contrib/guix/var/precious_dirs.
The ./contrib/guix/guix-clean script is able to parse that file and make
sure to avoid them when cleaning out the working tree.
This relatively easy change eliminates all runtime dependencies (except
for the kernel) for dmg, which is the only native build tool that gets
put in our output tarballs.
This allows much more flexibility when constructing the codesigning
environment, and is much more robust.
./windeploy is a "working directory", and therefore belongs inside
distsrc-*. Many people have noticed their Guix builds failing after
hours simply because they did not remove windeploy (but did remove the
distsrc-* directories).
In Guix, there are two flags for controlling parallelism:
Note: When I say "derivation," think "package"
--cores=n
- controls the number of CPU cores to build each derivation. This is
the value passed to `make`'s `--jobs=` flag.
- defaults to 0: as many cores as is available
--max-jobs=n
- controls how many derivations can be built in parallel
- defaults to 1
Therefore, if set --max-jobs=$MAX_JOBS and don't set --cores, Guix could
theoretically spin up $MAX_JOBS * $(nproc) number of threads, and that's
no good.
So we could either default to --cores=1, --max-jobs=$MAX_JOBS
- Pro: --cores=1 means that `make` will be invoked with `-j1`,
avoiding problems with package whose build systems and test
suites break when running multi-threaded.
- Con: There will be times when only 1 or 2 derivations can be built
at a time, because the rest of the dependency graph all depend
on those 1 or 2 derivations. During these times, the machine
will be severely under-utilized.
or --cores=$MAX_JOBS, --max-jobs=1
- Pro: We don't encounter prolonged periods of
severe under-utilization mentioned above.
- Con: Many packages' build systems and test suites break when running
multi-threaded.
or --cores=1, --max-jobs=1 and let the user override with
$ADDITIONAL_GUIX_COMMON_FLAGS
fanquake