install

Additional install commands

macOS

Homebrewverified · 100%

brew install classads

local Homebrew formula metadata

Linux

Nixverified · 92%

nix profile install nixpkgs#classads

nixpkgs package indexes · pkgs/by-name/cl/classads/package.nix · source: api.github.com

overview

Package summary

Classified Advertisements (used by HTCondor Central Manager)

Project links

Commands and aliases

classad_functional_tester
classad_functional_tester_ns
classad_version
classad_version_ns
cxi
cxi_ns

history

Project history and usage

ClassAds are HTCondor's classified advertisement language and matching mechanism for describing jobs, machines, submitters, resources, and constraints in high-throughput computing systems.

Project history

The official ClassAds page describes ClassAds as the lingua franca of HTCondor, exchanged by HTCondor processes to describe jobs, workstations, and other resources. The same page states that the ClassAd library is also available as a standalone package outside HTCondor.

HTCondor documentation records a transition from Old ClassAds to New ClassAds: Old ClassAds were tied to HTCondor development libraries, New ClassAds added features and were designed as a standalone library, and HTCondor switched to the New ClassAd library in version 7.5.1.

Adoption history

The standalone C++ ClassAd distribution has official release history from 0.9.6 in October 2004 through 1.0.10 in April 2011. Homebrew packages that standalone tarball as classads 1.0.10 and reported 101 installs over the prior 365 days.

How it is used

ClassAds are used for matchmaking: a job ClassAd and a machine ClassAd can refer to one another while expressions evaluate whether constraints are satisfied. The Homebrew package exposes small C++ library utilities such as cxi and classad_version.

Why package nerds care

ClassAds is package-nerd interesting because Homebrew preserves a standalone slice of HTCondor's scheduler expression language as a small C++ package, separate from the much larger HTCondor system.

Timeline

2004: Official standalone C++ library version 0.9.6 released.
2010: HTCondor 7.5.1 switched to the New ClassAd library.
2011: Official standalone C++ library version 1.0.10 released.
2026: Homebrew formula metadata lists classads 1.0.10 as stable.

Related projects

ClassAds are part of the HTCondor software suite and are also documented in the HTCondor manual.
The official ClassAds page references Java implementations and ClassAd language papers/specifications alongside the C++ library.

Sources

security posture

Risk level: green

narrow executable package without higher-risk signals.

Risk classifier

green risk · low confidence · appliance

Why

narrow executable package without higher-risk signals

Signals

metadata:no-higher-risk-signals

Install behavior

No Homebrew post-install hook is recorded in formula metadata.
Homebrew bottle metadata is available for 6 platform targets.
Build metadata lists 3 build dependencies.

Recommended review

Before unattended agent use, check whether the tool reads plaintext credentials, writes remote state, publishes artifacts, or shells out to plugins.

executables

Installed executables

Command	Kind	Exposure
`classad_functional_tester`	cli	global executable
`classad_functional_tester_ns`	cli	global executable
`classad_version`	cli	global executable
`classad_version_ns`	cli	global executable
`cxi`	cli	global executable
`cxi_ns`	cli	global executable

freshness

Version and freshness

These signals separate page generation age, package-manager activity, and upstream release comparison. Version lag is warned only when an evidence URL and comparable versions are present.

page generated2026-07-08

manager version1.0.10

manager updated

local dataok

upstreamnot checked

latest detectednot detected

https://research.cs.wisc.edu/htcondor/classad/

infoNo package-manager update timestamp was available.low confidence
infoRelease/tag comparison is only available for GitHub repositories.https://research.cs.wisc.edu/htcondor/classad/none confidence

install metadata

Package metadata

Package key	brew:classads
Version	1.0.10
Package manager	Homebrew
Package manager page	https://formulae.brew.sh/formula/classads
Homepage	https://research.cs.wisc.edu/htcondor/classad/
Repository	https://github.com/htcondor/htcondor
Upstream docs	https://htcondor.org/classad/c%2B%2Bdoc
License	Apache-2.0
Source archive	https://ftp.cs.wisc.edu/condor/classad/c++/classads-1.0.10.tar.gz
Build dependencies	autoconf, automake, libtool
Bottle	available (on arm64_linux, arm64_sequoia, arm64_sonoma, arm64_tahoe, sonoma, x86_64_linux)
Homebrew post-install	not defined
Service	none declared

registry facts

Source database details

Source Database	Homebrew formula API
Tap	homebrew/core
Full Name	classads
Version Scheme	0
Revision	0
Bottle Stable Root URL	https://ghcr.io/v2/homebrew/core
Deprecated	no
Disabled	no
Keg Only	no
URL Keys	stable

source database matches

Other package-manager records

Matches are pulled from external package-manager indexes and kept separate from local Automic Vault package links.

Nix95%

classads

nix profile install nixpkgs#classads

normalized package name match
Matched by: Classads

nixpkgs package indexes · api.github.com · nixpkgs package indexes: pkgs/by-name/cl/classads/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1

package graph

Links come from deterministic package relationships, av.db category and tag curation, ecosystem matches, and package hub membership.

source trail

Generated from repository data

This page is generated by av-web from the private package SQLite artifact built by scripts/generate-pkg-sqlite.py.

Combined YAML source

View the package source record on GitHub.

combined/classads.yml

Used sources

Geiger risk classifier
Nucleus package database
av.db category and tag curation
cross-ecosystem install command graph
curated package history
external package-manager database matches
package relationship graph
package version freshness
package-page enrichment

Install classads with Homebrew, Nix