Hello Ludo',
On 07/04/2025 2:22 pm, Ludovic Courtès wrote:
Hello Ada,
(Cc: Reepca, who followed these developments.)
The build discrepancies you report are serious enough that we need to
find a strategy other than re-mounting the root directory MS_RDONLY so
we get EPERM and not EROFS on /.
I think we can go with the solution Reepca outlined in
<https://issues.guix.gnu.org/75810#14-lineno78>: expose
chrootRootDir/top inside the build environment (with permissions 0555
but still user-owned). I’ll work on it.
Thank you for looking into this!
Below are details about the failures you reported, Ada, reproduced with
commit 6af680670bf9055b90e6f8b63c4c2ab7b08e7c56 and a recent guix-daemon
where the build environment root is remounted read-only.
For scons, I get:
--8<---------------cut here---------------start------------->8---
ERROR: test_PathIsDirCreate (__main__.PathVariableTestCase)
Test the PathIsDirCreate validator
----------------------------------------------------------------------
Traceback (most recent call last):
File
"/tmp/guix-build-scons-4.4.0.drv-0/source/SCons/Variables/PathVariableTests.py",
line 129, in test_PathIsDirCreate
o.validator('X', f, {})
File
"/tmp/guix-build-scons-4.4.0.drv-0/source/SCons/Variables/PathVariable.py",
line 105, in PathIsDirCreate
os.makedirs(val, exist_ok=True)
File
"/gnu/store/nla5820scsv7ibvr3kwpgkm9wr4prf0q-python-3.10.7/lib/python3.10/os.py",
line 215, in makedirs
makedirs(head, exist_ok=exist_ok)
File
"/gnu/store/nla5820scsv7ibvr3kwpgkm9wr4prf0q-python-3.10.7/lib/python3.10/os.py",
line 225, in makedirs
mkdir(name, mode)
OSError: [Errno 30] Read-only file system: '/yyy'
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File
"/tmp/guix-build-scons-4.4.0.drv-0/source/SCons/Variables/PathVariableTests.py",
line 133, in test_PathIsDirCreate
raise Exception("did not catch expected UserError") from e
Exception: did not catch expected UserError
[…]
build of /gnu/store/jwsp6vz0hxriiylfl53wg2m98npwv8iy-scons-4.4.0.drv failed
--8<---------------cut here---------------end--------------->8---
And indeed, the code in question expects EEXIST or EPERM, but not EROFS:
--8<---------------cut here---------------start------------->8---
def PathIsDirCreate(key, val, env) -> None:
"""Validator to check if Path is a directory,
creating it if it does not exist."""
try:
os.makedirs(val, exist_ok=True)
except FileExistsError:
m = 'Path for option %s is a file, not a directory: %s'
raise SCons.Errors.UserError(m % (key, val))
except PermissionError:
m = 'Path for option %s could not be created: %s'
raise SCons.Errors.UserError(m % (key, val))
--8<---------------cut here---------------end--------------->8---
For Ruby, I get:
--8<---------------cut here---------------start------------->8---
make[1]: Leaving directory '/tmp/guix-build-ruby-3.3.3.drv-0/ruby-3.3.3'
Generating RDoc documentation
uh-oh! RDoc had a problem:
Read-only file system @ dir_s_mkdir - /homeless-shelter
run with --debug for full backtrace
make: *** [uncommon.mk:665: rdoc] Error 1
error: in phase 'build': uncaught exception:
%exception #<&invoke-error program: "make" arguments: ("-j" "4") exit-status: 2
term-signal: #f stop-signal: #f>
phase `build' failed after 232.1 seconds
command "make" "-j" "4" failed with status 2
build process 6 exited with status 256
note: keeping build directory `/tmp/guix-build-ruby-3.3.3.drv-0'
builder for `/gnu/store/n7zsjg0gm4kz74f2hp6k22iw42zwn5kn-ruby-3.3.3.drv' failed
with exit code 1
--8<---------------cut here---------------end--------------->8---
Not sure how it would deal with that unwritable $HOME previously.
However, /gnu/store/jyrmg3qkii4mb51ca1f3j9mv6knicr8a-go-1.23.5.drv
builds fine for me (no test failures).
It appears I was building the full bootstrap chain for go, and it is the
bootstrap go that is failing. Running this command will produce the
failing build: `guix build --no-substitutes --no-grafts
[email protected]`.
Ludo’.
--
Warmly,
Ada
