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Pre-commit unable to determine if it is in a container from /proc/1/cgroup for Docker-in-Docker setups #3360

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@JasonAlt

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@JasonAlt

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is:issue docker is:open

describe your issue

Developing in a Fedora 40 container on a Fedora 41 host, using Docker-in-Docker such that pre-commit can make use of existing containers for lint tests. It appears that the contents of/proc/1/cgroup has changed:

$ cat /proc/1/cgroup0::/

This is in contrast to pre-commit's checks for_is_in_docker() and_get_container_id:

def _is_in_docker() -> bool:    try:        with open('/proc/1/cgroup', 'rb') as f:            return b'docker' in f.read()    ...def _get_container_id() -> str:    ...    with open('/proc/1/cgroup', 'rb') as f:        for line in f.readlines():            if line.split(b':')[1] == b'cpuset':                return os.path.basename(line.split(b':')[2]).strip().decode()    ...

It's not clear yet what has changed with/proc/1/cgroup nor what the fix should be.

Host:

$ rpm -qa |grep dockerdocker-ce-cli-27.3.1-1.fc41.x86_64docker-ce-27.3.1-1.fc41.x86_64docker-ce-rootless-extras-27.3.1-1.fc41.x86_64docker-compose-plugin-2.29.7-1.fc41.x86_64docker-buildx-plugin-0.17.1-1.fc41.x86_64

Guest:

$ rpm -qa |grep dockerdocker-compose-plugin-2.29.7-1.fc40.x86_64docker-buildx-plugin-0.17.1-1.fc40.x86_64docker-ce-cli-27.3.1-1.fc40.x86_64

pre-commit --version

pre-commit 3.8.0

.pre-commit-config.yaml

repos:  -repo:localhooks:      -id:shfmtname:shfmt# shfmt versions can be found here:#   https://hub.docker.com/r/mvdan/shfmt/tagsentry:mvdan/shfmt:v3.8.0language:docker_imagetypes:[shell]args:["-w"]

~/.cache/pre-commit/pre-commit.log (if present)

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