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96 lines
3.2 KiB
Markdown
96 lines
3.2 KiB
Markdown
[](https://goreportcard.com/report/github.com/Luzifer/envrun)
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# Luzifer / envrun
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`envrun` is a small helper utility to inject environment variables stored in a file into processes.
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It reads a `.env` file (configurable) from the current directory and then either takes its own environment variables or a clean set and adds the env variables found in `.env` to it. The resulting set is passed to the command you put as arguments to `envrun`.
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## Examples
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To visualize the effect of the utility the test command is `python test.py` with this simple python script:
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```python
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import os
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for k in os.environ.keys():
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print "{} = {}".format(k, os.environ[k])
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```
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It just prints the current environment to `STDOUT` and exits.
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```console
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$ cat .env
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MY_TEST_VAR=hello world
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ANOTHER_VAR=foo
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$ python test.py | grep MY_TEST_VAR
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## No output on this command
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$ envrun --help
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Usage of envrun:
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--clean Do not pass current environment to child process
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--encryption string Encryption method used for encrypted env-file (Available: openssl-md5) (default "openssl-md5")
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--env-file string Location of the environment file (default ".env")
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--log-level string Log level (debug, info, warn, error, fatal) (default "info")
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-p, --password string Password to decrypt environment file
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--password-file string Read encryption key from file
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--q Suppress informational messages from envrun (DEPRECATED, use --log-level=warn)
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--version Prints current version and exits
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$ envrun python test.py | grep MY_TEST_VAR
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MY_TEST_VAR = hello world
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$ envrun python test.py | wc -l
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45
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$ envrun --clean python test.py | wc -l
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3
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$ envrun --clean python test.py
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__CF_USER_TEXT_ENCODING = 0x1F5:0x0:0x0
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ANOTHER_VAR = foo
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MY_TEST_VAR = hello world
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```
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## Encrypted `.env`-file
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In case you don't want to put the environment variables into a plain text file onto your disk you can use an encrypted file and provide a password to `envrun`:
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### GnuPG symmetric encryption
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In this example an armored (`-a`) encryption is used. This is not required and you can leave out the `-a` flag.
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```console
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$ echo "MYVAR=myvalue" | gpg --passphrase justatest --batch --quiet --yes -c -a -o .env
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$ cat .env
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-----BEGIN PGP MESSAGE-----
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jA0ECQMCIsGVKNlJw1Py0kMB542XJvekKyuPi2LHQrnFlhD5ALm6orvE3WFAzp7D
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kAisTMr10fmjLuENfQhxqd9MB0Kd2mfd3b1mgOzei5IMDLJc
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=7k9M
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-----END PGP MESSAGE-----
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$ envrun -p justatest --encryption gpg-symmetric --clean -- env
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MYVAR=myvalue
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INFO[0000] Process exitted with code 0
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```
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### OpenSSL AES256 encryption
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Pay attention on the `-md md5` flag: OpenSSL 1.1.0f and newer uses an incompatible hasing algorithm for the passwords!
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```console
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$ echo 'MYVAR=myvalue' | openssl enc -e -aes-256-cbc -pass pass:justatest -md md5 -base64 -out .env
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$ cat .env
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U2FsdGVkX18xcVIMejjwWzh1DppzptJCHhORH/JDj10=
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$ envrun -p justatest --clean -- env
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MYVAR=myvalue
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2017/03/21 16:34:57 Process exitted with code 0
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```
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