[JENKINS-66285] Cant get content file through subshell syntax: $(command) in ssh-agent

[jenkins-infra-bot]

I build images usig Jenkinsfile with my versioning which store in txt files.

And I use ssh-agent in post-actions to remove temporary images.

So I use command set like this:

cd /home/jenkins/docker/basic_images
export REPO="$(cat ./repo.txt)"
export PHP_VERSION=$(cat ./php-fpm/phpVersion.txt)
export PHP_IMAGE_NAME=$(cat ./php-fpm/imageName.txt)
export PHP_IMAGE_VERSION="$(cat ./php-fpm/imageVersion.txt)"
export PHP_COMMON_IMAGE_NAME=$REPO/basic-php-$PHP_VERSION-$PHP_IMAGE_NAME
docker rmi $PHP_COMMON_IMAGE_NAME:$PHP_IMAGE_VERSION

And in Console Output I see that result:

cd /home/jenkins/docker/basic_images
export REPO=""
export PHP_VERSION=
export PHP_IMAGE_NAME=
export PHP_IMAGE_VERSION=""
export PHP_COMMON_IMAGE_NAME=/basic-php--
docker rmi :

I tried many other bash possibilities: single/double quotes, apostrophes, while-cycle; set etc. And always blocked to get data from file to set env.

Besides other operations, which "echo $PATH", "cat ./" finished successful.

So: maybe you offer me the way to solve my problem?
Thx!

---

Originally reported by denisg, imported from: Cant get content file through subshell syntax: $(command) in ssh-agent

• status: Open
• priority: Minor
• component(s): ssh-agent-plugin
• resolution: Unresolved
• votes: 0
• watchers: 1
• imported: 20260604-211335

Raw content of original issue

I build images usig Jenkinsfile with my versioning which store in txt files.

And I use ssh-agent in post-actions to remove temporary images.

So I use command set like this:

cd /home/jenkins/docker/basic_images
export REPO="$(cat ./repo.txt)"
export PHP_VERSION=$(cat ./php-fpm/phpVersion.txt)
export PHP_IMAGE_NAME=$(cat ./php-fpm/imageName.txt)
export PHP_IMAGE_VERSION="$(cat ./php-fpm/imageVersion.txt)"
export PHP_COMMON_IMAGE_NAME=$REPO/basic-php-$PHP_VERSION-$PHP_IMAGE_NAME
docker rmi $PHP_COMMON_IMAGE_NAME:$PHP_IMAGE_VERSION


And in Console Output I see that result:

cd /home/jenkins/docker/basic_images
export REPO=""
export PHP_VERSION=
export PHP_IMAGE_NAME=
export PHP_IMAGE_VERSION=""
export PHP_COMMON_IMAGE_NAME=/basic-php--
docker rmi :


I tried many other bash possibilities: single/double quotes, apostrophes, while-cycle; set etc. And always blocked to get data from file to set env.
Besides other operations, which "echo $PATH", "cat ./<filename>" finished successful.
So: maybe you offer me the way to solve my problem?
 Thx!