Claude Code, Skill
Nix Best Practices Skill
A standard for Nix: the scope a with opens, the shape of a module header and where its options live, what a derivation's meta has to say, what a flake.lock must not hold — everything nixfmt, statix and deadnix cannot see and therefore has to be written down — plus check-nix.sh,
Compatibility: Not stated.
Grade D
Two or more Medium findings, or a High. Only try it in a sandbox.
Not a guarantee. A hygiene check of the source at the commit shown, not a security audit.
INSTALL_REMOTE_SCRIPT
Why this grade
- INSTALL_REMOTE_SCRIPT High
Fetches a script from the network and runs it (a pipe to a shell, or an install hook with a URL).
check-pins.sh, line 73
'(curl|wget) [^|]*[|] *(sudo +)?(ba|z)?sh( |$)' 'curl -fsSL https://example.invalid/install.sh | sh'
Any High, or two or more Medium findings, give D. One Medium gives C. Low findings or a security Note give B. Each code names a finding behind the letter.
If you think this grade is wrong, email [email protected] with the entry link and your evidence. We aim to acknowledge within two working days and decide within seven. If we confirm an error, we aim to correct it within 24 hours of confirming it. These are aims, not guarantees.
Grades are a hygiene check of the source at the commit shown, on the date checked, not a security audit or a guarantee. The free directory grades are automated. Before release, a PlugVet engineer reviews every paid report and any grade we hold back, including all F grades, against the source code and the evidence we quote.
What was checked
Plain notes from the hygiene checks.
Permissions
Concern
can delete files.
PERMISSION_DELETE_FILES
vendor-sync.sh, line 189
shutil.rmtree(target)
Install and update
Serious
install fetches a script from the network.
INSTALL_REMOTE_SCRIPT
check-pins.sh, line 73
'(curl|wget) [^|]*[|] *(sudo +)?(ba|z)?sh( |$)' 'curl -fsSL https://example.invalid/install.sh | sh'
check-pins.sh, line 74
'' 'wget -qO- https://example.invalid/install.sh | sudo bash'
Network
Concern
can reach example.invalid. The description does not name that host. can reach a host that is not written as a fixed address.
NETWORK_NO_FIXED_HOST NETWORK_UNNAMED_HOST
check-pins.sh, line 75
'' 'curl -fsSL https://example.invalid/install.sh | zsh'
check-sh.sh, line 1150
# The help again, through the pipe `bash <(curl …)` hands bash. bash reads a script from
vendor-sync.sh, line 2
# Needs bash 3.2, git and POSIX tools only; URL sources also need curl and python3
Show more
vendor-sync.sh, line 46
their executable bit. URL sources need curl and python3; Git sources do not need them.
vendor-sync.sh, line 144
fetch() {
vendor-sync.sh, line 162
command -v curl >/dev/null || fail "URL sources need curl"
vendor-sync.sh, line 166
curl --fail --silent --show-error --location --max-time 120 \
Secrets
Concern
reads a credential or environment file.
SECRETS_PATH_DOTENV
references/packages.md, line 95
pname: .env.pname,
references/packages.md, line 96
version: .env.version,
references/packages.md, line 97
mainProgram: .env.NIX_MAIN_PROGRAM,
Agent instructions
Pass
No instruction to ignore earlier instructions or to hide a step.
Obfuscation
Pass
No encoded or minified payload found.
Licence
Pass
A licence file is present (LICENSE).
Maintainer activity
Pass
The latest commit is within the last 365 days.
Note
Hygiene check of commit a1238b481d5f. can delete files. install fetches a script from the network. can reach example.invalid. The description does not name that host. can reach a host that is not written as a fixed address. reads a credential or environment file.
Date and source
Date checked:
github.com
Commit graded: a1238b481d5f377ae8eb24fe9b039d39eb0956e9
This link goes to the original host. PlugVet does not host or check what you download from there, and installing it is your own decision and risk.