d1e139c3fb
Add more detailed HCL2 docs, mostly lifted from Packer with tweaks for Nomad. The function docs are basically verbatim taken from Packer with basic string substitutions. I commented out some for_each details as the examples are mostly driven towards Packer resources. I'll iterate on those with better Nomad examples.
55 lines
1.7 KiB
Plaintext
55 lines
1.7 KiB
Plaintext
---
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layout: docs
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page_title: pathexpand - Functions - Configuration Language
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sidebar_title: pathexpand
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description: |-
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The pathexpand function expands a leading ~ character to the current user's
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home directory.
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---
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# `pathexpand` Function
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`pathexpand` takes a filesystem path that might begin with a `~` segment,
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and if so it replaces that segment with the current user's home directory
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path.
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This function works only with the path string and does not access the
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filesystem itself. It is therefore unable to take into account filesystem
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features such as symlinks.
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If the leading segment in the path is not `~` then the given path is returned
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unmodified.
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Using this function in job arguments will cause spurious diffs if the
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same configuration is run by multiple users with different home directory
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paths, or used on different host operating systems.
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The rules for determining the "home directory" for the current user vary
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depending on host operating system.
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**For Unix systems**, the following sources are consulted, in order of preference:
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- The `HOME` environment variable.
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- The result of running `getent passwd` followed by the Nomad process uid.
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- The result of running `cd && pwd` in `sh`.
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**For Windows systems**, there is not really the concept of a home directory
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in the same sense as on Unix, but the following sources are consulted in
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order of preference:
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- The `HOME` environment variable.
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- The `HOMEDRIVE` and `HOMEPATH` environment variables, if both are set.
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- The `USERPROFILE` environment variable.
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The exact rules employed for each operating system may change in future
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releases of Nomad.
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## Examples
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```shell-session
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> pathexpand("~/.ssh/id_rsa")
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/home/steve/.ssh/id_rsa
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> pathexpand("/etc/resolv.conf")
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/etc/resolv.conf
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```
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