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Survey of the version constraints that CRAN packages put on R itself (operators, repeated bounds, dash-separated versions), as a reproducible Pixi workspace. Supports prefix-dev/rattler-build PR 2759.
Raw
README.md
How to reproduce the CRAN numbers

With Pixi installed, save the two files below next to each other and run

$ pixi run snapshot 2026-09-29  # the CRAN index as archived by Posit Package Manager on that day
$ pixi run survey               # the CRAN index as it is right now

pixi.toml:

[workspace]
name = "cran-r-constraints"
description = "Survey the constraints that CRAN packages put on R itself"
channels = ["conda-forge"]
platforms = ["linux-64", "linux-aarch64", "osx-arm64", "win-64"]

[dependencies]
python = ">=3.14.7,<3.15"

[tasks.survey]
description = "The CRAN index as it is right now"
cmd = "python cran_r_constraints.py https://cloud.r-project.org/src/contrib/PACKAGES.gz"

[tasks.snapshot]
description = " The CRAN index as Posit Package Manager archived it on the given day, e.g. pixi run snapshot 2026-09-29"
args = ["date"]
cmd = "python cran_r_constraints.py https://packagemanager.posit.co/cran/{{ date }}/src/contrib/PACKAGES.gz"

[tasks.start]
depends-on = ["survey"]

cran_r_constraints.py:

"""Survey the constraints that CRAN packages put on R itself.

Reads a CRAN package index (the `Depends` field of every package) and reports
which operators are used, which packages bound R more than once, and which
write the R version in a form other than dot-separated numbers.

Usage:
    python cran_r_constraints.py <URL or path of a PACKAGES.gz>
"""

import collections
import gzip
import hashlib
import pathlib
import re
import sys
import urllib.request

# An entry of `Depends` that names R itself, e.g. "R (>= 4.1.0)" or "R"
R_ENTRY = re.compile(r"^\s*R\s*(?:\(\s*([<>=!]+)\s*([^)]*?)\s*\))?\s*$")


def read_index(source):
    """The bytes of the index at `source`, a URL or a local path."""
    if re.match(r"^https?://", source):
        with urllib.request.urlopen(source) as response:
            return response.read()
    return pathlib.Path(source).read_bytes()


def packages(index):
    """The fields of each record of a Debian-control-style index."""
    text = gzip.decompress(index).decode("utf-8", errors="replace")
    records = []
    for record in text.split("\n\n"):
        # Continuation lines start with whitespace
        record = re.sub(r"\n[ \t]+", " ", record)
        fields = dict(
            line.split(": ", 1) for line in record.split("\n") if ": " in line
        )
        if "Package" in fields:
            records.append(fields)
    return records


def r_constraints(fields):
    """The (operator, version) pairs that `Depends` puts on R."""
    constraints = []
    for entry in fields.get("Depends", "").split(","):
        match = R_ENTRY.match(entry)
        if match:
            constraints.append((match.group(1), match.group(2)))
    return constraints


def as_numbers(version):
    return tuple(int(number) for number in re.findall(r"\d+", version))


def main(source):
    index = read_index(source)
    records = packages(index)

    n_with_r = 0
    operators = collections.Counter()
    n_components = collections.Counter()
    several = []
    not_dotted = []
    not_at_least = []

    for fields in records:
        constraints = r_constraints(fields)
        if not constraints:
            continue
        n_with_r += 1
        if len(constraints) > 1:
            several.append((fields["Package"], constraints))
        for operator, version in constraints:
            operators[operator] += 1
            if operator is None:
                continue
            n_components[len(version.split("."))] += 1
            if not re.fullmatch(r"\d+(\.\d+)*", version):
                not_dotted.append((fields["Package"], operator, version))
            if operator != ">=":
                not_at_least.append((fields["Package"], operator, version))

    strictest_not_first = [
        (name, constraints)
        for name, constraints in several
        if all(operator in (">=", ">") for operator, _ in constraints)
        and as_numbers(constraints[0][1])
        < max(as_numbers(version) for _, version in constraints)
    ]

    print(f"index:  {source}")
    print(f"sha256: {hashlib.sha256(index).hexdigest()}")
    print()
    print(f"packages:                             {len(records)}")
    print(f"packages with R in Depends:           {n_with_r}")
    print(f"constraints on R:                     {sum(operators.values())}")
    print(f"constraints on R, by operator:        {dict(operators)}")
    print(f"constraints on R, by component count: {dict(sorted(n_components.items()))}")
    print(f"packages with several R entries:      {len(several)}")
    for name, constraints in several:
        print(f"    {name}: {constraints}")
    print(f"  of which strictest is not first:    {len(strictest_not_first)}")
    for name, constraints in strictest_not_first:
        print(f"    {name}: {constraints}")
    print(f"versions not dot-separated numbers:   {len(not_dotted)}")
    for name, operator, version in not_dotted:
        print(f"    {name}: {operator} {version}")
    print(f"operators other than '>=':            {len(not_at_least)}")
    for name, operator, version in not_at_least:
        print(f"    {name}: {operator} {version}")


if __name__ == "__main__":
    main(sys.argv[1])
Raw
cran_r_constraints.py
"""Survey the constraints that CRAN packages put on R itself.
Reads a CRAN package index (the `Depends` field of every package) and reports
which operators are used, which packages bound R more than once, and which
write the R version in a form other than dot-separated numbers.
Usage:
python cran_r_constraints.py <URL or path of a PACKAGES.gz>
"""
import collections
import gzip
import hashlib
import pathlib
import re
import sys
import urllib.request
# An entry of `Depends` that names R itself, e.g. "R (>= 4.1.0)" or "R"
R_ENTRY = re.compile(r"^\s*R\s*(?:\(\s*([<>=!]+)\s*([^)]*?)\s*\))?\s*$")
def read_index(source):
"""The bytes of the index at `source`, a URL or a local path."""
if re.match(r"^https?://", source):
with urllib.request.urlopen(source) as response:
return response.read()
return pathlib.Path(source).read_bytes()
def packages(index):
"""The fields of each record of a Debian-control-style index."""
text = gzip.decompress(index).decode("utf-8", errors="replace")
records = []
for record in text.split("\n\n"):
# Continuation lines start with whitespace
record = re.sub(r"\n[ \t]+", " ", record)
fields = dict(
line.split(": ", 1) for line in record.split("\n") if ": " in line
)
if "Package" in fields:
records.append(fields)
return records
def r_constraints(fields):
"""The (operator, version) pairs that `Depends` puts on R."""
constraints = []
for entry in fields.get("Depends", "").split(","):
match = R_ENTRY.match(entry)
if match:
constraints.append((match.group(1), match.group(2)))
return constraints
def as_numbers(version):
return tuple(int(number) for number in re.findall(r"\d+", version))
def main(source):
index = read_index(source)
records = packages(index)
n_with_r = 0
operators = collections.Counter()
n_components = collections.Counter()
several = []
not_dotted = []
not_at_least = []
for fields in records:
constraints = r_constraints(fields)
if not constraints:
continue
n_with_r += 1
if len(constraints) > 1:
several.append((fields["Package"], constraints))
for operator, version in constraints:
operators[operator] += 1
if operator is None:
continue
n_components[len(version.split("."))] += 1
if not re.fullmatch(r"\d+(\.\d+)*", version):
not_dotted.append((fields["Package"], operator, version))
if operator != ">=":
not_at_least.append((fields["Package"], operator, version))
strictest_not_first = [
(name, constraints)
for name, constraints in several
if all(operator in (">=", ">") for operator, _ in constraints)
and as_numbers(constraints[0][1])
< max(as_numbers(version) for _, version in constraints)
]
print(f"index: {source}")
print(f"sha256: {hashlib.sha256(index).hexdigest()}")
print()
print(f"packages: {len(records)}")
print(f"packages with R in Depends: {n_with_r}")
print(f"constraints on R: {sum(operators.values())}")
print(f"constraints on R, by operator: {dict(operators)}")
print(f"constraints on R, by component count: {dict(sorted(n_components.items()))}")
print(f"packages with several R entries: {len(several)}")
for name, constraints in several:
print(f" {name}: {constraints}")
print(f" of which strictest is not first: {len(strictest_not_first)}")
for name, constraints in strictest_not_first:
print(f" {name}: {constraints}")
print(f"versions not dot-separated numbers: {len(not_dotted)}")
for name, operator, version in not_dotted:
print(f" {name}: {operator} {version}")
print(f"operators other than '>=': {len(not_at_least)}")
for name, operator, version in not_at_least:
print(f" {name}: {operator} {version}")
if __name__ == "__main__":
main(sys.argv[1])
Raw
pixi.lock
version: 7
platforms:
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virtual-packages:
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virtual-packages:
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- name: osx-arm64
virtual-packages:
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virtual-packages:
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- zstd >=1.5.7,<1.6.0a0
size: 387535
timestamp: 1786599623274
Raw
pixi.toml
[workspace]
name = "cran-r-constraints"
description = "Survey the constraints that CRAN packages put on R itself"
channels = ["conda-forge"]
platforms = ["linux-64", "linux-aarch64", "osx-arm64", "win-64"]
[dependencies]
python = ">=3.14.7,<3.15"
[tasks.survey]
description = "The CRAN index as it is right now"
cmd = "python cran_r_constraints.py https://cloud.r-project.org/src/contrib/PACKAGES.gz"
[tasks.snapshot]
description = " The CRAN index as Posit Package Manager archived it on the given day, e.g. pixi run snapshot 2026-09-29"
args = ["date"]
cmd = "python cran_r_constraints.py https://packagemanager.posit.co/cran/{{ date }}/src/contrib/PACKAGES.gz"
[tasks.start]
depends-on = ["survey"]
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