80 lines
1.8 KiB
Markdown
80 lines
1.8 KiB
Markdown
+++
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+++
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## why?
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lets take this script:
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```bash
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rm -fr data.json
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curl https://url.com/data.json -o data.json
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```
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the problem here is that `curl` might not be installed on second line, but the data is already deleted.
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it will result in `data.json` being irreparably deleted and no way to reinstall it
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## solution
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so generally, you would want to check if the dependencies of your bash script are installed, right?
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you could write up something like this and put it in the start:
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```sh
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if ! command -v curl; then
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echo no curl!
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exit 1
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fi
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```
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but that's just not reliable and barely maintainable. so that's why i made this thing. it parses your script, and then appends a small snippet at the earliest place in your program that would check if all deps are installed.
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you can use it like this:
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```sh
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#!/usr/bin/env bash
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curl https://url.com
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```
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then compile it like that: `bshchk program.sh dist.sh`.
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also you can read the script from stdin: `cat program.sh | bshchk - dist.sh`, or get the output to stdout: `bshchk program.sh > dist.sh`
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it would output something like this:
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```sh
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#!/usr/bin/env bash
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# This is the runtime dependency checker
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# Please do not remove the following lines.
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deps=('curl')
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non_ok=()
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for d in $deps
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do
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if ! command -v $d > /dev/null 2>&1; then
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non_ok+=$d
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fi
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done
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if (( ${#non_ok[@]} != 0 )); then
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>&2 echo "RDC Failed!"
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>&2 echo " This program requires these commands:"
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>&2 echo " > $deps"
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>&2 echo " --- "
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>&2 echo " From which, these are missing:"
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>&2 echo " > $non_ok"
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>&2 echo "Make sure that those are installed and are present in \$PATH."
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exit 1
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fi
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unset non_ok
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unset deps
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# Dependencies are OK at this point
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curl https://url.com
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```
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---
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[website's source code available here](https://git.blek.codes/blek/bshchk.web)
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