While looking into some issues with qemu-minimal@2.10.2 (used to test
GRUB), I found that I am receiving the incorrect log-file from the
Berlin build farm:

I am working from commit 8f9c5aa3ba33b025ac8d4edde4b4d9d649e05848 (gnu:
curl: Update to 7.64.0 [fixes CVE-2018-16890 and
CVE-2019-{3822,3823}].).

$ ./pre-inst-env guix build --no-grafts -e '(@@ (gnu packages virtualization) qemu-minimal-2.10)' --substitute-urls=https://berlin.guixsd.org
/gnu/store/fmwazsg7rgdq7zlxmq3rviwab54gxw8f-qemu-minimal-2.10.2
$ ./pre-inst-env guix build --no-grafts -e '(@@ (gnu packages virtualization) qemu-minimal-2.10)' --substitute-urls=https://berlin.guixsd.org -d
/gnu/store/6k7gpas81l6bb4ds7pdxr8c9k65292vz-qemu-minimal-2.10.2.drv
$ ./pre-inst-env guix build --no-grafts -e '(@@ (gnu packages virtualization) qemu-minimal-2.10)' --substitute-urls=https://berlin.guixsd.org --log-file                      
https://berlin.guixsd.org/log/fmwazsg7rgdq7zlxmq3rviwab54gxw8f-qemu-minimal-2.10.2

The log file shows that it belongs to a different derivation. Not to
mention that it describes a failed build:
------
TEST: tests/test-io-channel-socket... (pid=14521)
FAIL: tests/test-io-channel-socket
make: *** [/tmp/guix-build-qemu-minimal-2.10.2.drv-0/qemu-2.10.2/tests/Makefile.include:849: check-tests/test-io-channel-socket] Error 1

Test suite failed, dumping logs.
Backtrace:
           4 (primitive-load "/gnu/store/5s9z2df3l8dn85nn29534yrhz1q…")
In ice-9/eval.scm:
   191:35  3 (_ _)
In srfi/srfi-1.scm:
   863:16  2 (every1 #<procedure 802440 at /gnu/store/gfprsx2m62cvq…> …)
In /gnu/store/gfprsx2m62cvqbh7ysc9ay9slhijvmal-module-import/guix/build/gnu-build-system.scm:
   799:28  1 (_ _)
    369:6  0 (check #:target _ #:make-flags _ #:tests? _ # _ # _ # _)

/gnu/store/gfprsx2m62cvqbh7ysc9ay9slhijvmal-module-import/guix/build/gnu-build-system.scm:369:6: In procedure check:
Throw to key `srfi-34' with args `(#<condition &invoke-error [program: "make" arguments: ("check") exit-status: 2 term-signal: #f stop-signal: #f] 640040>)'.
builder for `/gnu/store/mr5zvp4wrlyiwl125qpzc9np8gnmlm26-qemu-minimal-2.10.2.drv' failed with exit code 1
@ build-failed /gnu/store/mr5zvp4wrlyiwl125qpzc9np8gnmlm26-qemu-minimal-2.10.2.drv - 1 builder for `/gnu/store/mr5zvp4wrlyiwl125qpzc9np8gnmlm26-qemu-minimal-2.10.2.drv' failed with exit code 1
------