sceptre-cmd-resolver
Sceptre resolver to execute generic shell commands
Decision gist · record as of 2026-08-14
Yes, if you use Sceptre and need to inject dynamic values into CloudFormation stacks at deploy time. The low install friction, active maintenance, permissive license, and zero known vulnerabilities make it safe to adopt. The single dependency on sceptre itself keeps the footprint minimal. Install it when you want to move beyond static parameters and integrate external tools or APIs into your infrastructure-as-code workflow.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Low friction install with a single runtime dependency on sceptre.
- The package is actively maintained with recent commits and supports Python 3.7 through 3.10.
License · maintenance · safety
Apache2 (permissive) — Apache2 permissive license allows use in commercial and proprietary projects without significant restrictions.
last release 2023-02-13 (1278 days) · last repo commit 2026-08-10 · 7 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 115,508 downloads/mo, #12,247 on PyPI
Alternatives
Verify before relying
pip install sceptre-cmd-resolver
# In a Sceptre config YAML file:
parameters:
DatabasePassword: !rcmd cat .env/password
LatestAmiId: !rcmd aws ssm get-parameters --names /aws/service/canonical/ubuntu/server/20.04/stable/current/amd64/hvm/ebs-gp2/ami-id --query 'Parameters[0].[Value]' --output text- Whether the resolver works reliably with Windows PowerShell or only Unix-like shells
- Performance characteristics when resolving many parameters or executing long-running commands
- Whether environment variables and AWS credentials are properly inherited during command execution
What it is and what it does
This is a plugin for Sceptre, the CloudFormation orchestration tool, that lets you use the `!rcmd` YAML tag to execute arbitrary shell commands and inject their output as CloudFormation stack parameters. Instead of hardcoding values, you can run commands at deploy time—pulling secrets from Vault, querying AWS APIs for the latest AMI IDs, reading files, or piping output through standard Unix tools like jq and grep.
The resolver runs commands with the same AWS profile and credentials that Sceptre uses, and you can override the profile, region, or IAM role on a per-parameter basis. This makes it useful for dynamic lookups that depend on your deployment environment, secrets management integration, or any external data source accessible via the command line.
Use it for
- Fetch the latest Ubuntu AMI ID from AWS Systems Manager Parameter Store at stack deployment time
- Retrieve database passwords or API keys from Vault or similar secret management tools
- Read configuration or secrets from local files using cat, jq, or other Unix utilities
- Query AWS APIs (S3, EC2, etc.) to populate stack parameters with live data
- Generate deployment metadata like timestamps or usernames to include in stack tags or comments
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you use Sceptre and need to inject dynamic values into CloudFormation stacks at deploy time.
The low install friction, active maintenance, permissive license, and zero known vulnerabilities make it safe to adopt. The single dependency on sceptre itself keeps the footprint minimal. Install it when you want to move beyond static parameters and integrate external tools or APIs into your infrastructure-as-code workflow.
Install
sceptre-cmd-resolver on PyPI
Before you install
Low friction install with a single runtime dependency on sceptre. The package is actively maintained with recent commits and supports Python 3.7 through 3.10.
License in practice
Apache2 permissive license allows use in commercial and proprietary projects without significant restrictions.
Quickstart
pip install sceptre-cmd-resolver
# In a Sceptre config YAML file:
parameters:
DatabasePassword: !rcmd cat .env/password
LatestAmiId: !rcmd aws ssm get-parameters --names /aws/service/canonical/ubuntu/server/20.04/stable/current/amd64/hvm/ebs-gp2/ami-id --query 'Parameters[0].[Value]' --output textVerify before relying
- Whether the resolver works reliably with Windows PowerShell or only Unix-like shells
- Performance characteristics when resolving many parameters or executing long-running commands
- Whether environment variables and AWS credentials are properly inherited during command execution
Package facts
| License | Apache2 permissive |
| Python support | Not specified |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 1 packagesceptre |
| Maintenance | Actively maintained 1,278 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 115,508 / month, #12,247 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Environment :: ConsoleIntended Audience :: DevelopersNatural Language :: EnglishProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.7Programming Language :: Python :: 3.8Programming Language :: Python :: 3.9 |
Evidence: sceptre_cmd_resolver-2.0.0-py2.py3-none-any.whl
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See also sceptre · sceptre-file-resolver · resolvelib · yq · cfn-flip · nab-resolver · cloudformation-cli · aiohttp-asyncmdnsresolver · cfn-lint · referencing