Inherit variables from environment #149
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This adds mirror functions to resolve inherited variables with a lookup function. Signed-off-by: Ulysses Souza <ulyssessouza@gmail.com>
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Signed-off-by: Ulysses Souza <ulyssessouza@gmail.com>
go.mod
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| @@ -1,3 +1,3 @@ | |||
| module github.com/joho/godotenv | |||
| module github.com/ulyssessouza/godotenv | |||
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This probably shouldn’t be in this PR, right?
godotenv.go
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| // | ||
| // It's important to note that it WILL NOT OVERRIDE an env variable that already exists - consider the .env file to set dev vars or sensible defaults | ||
| func Load(filenames ...string) (err error) { | ||
| return LoadWithLookupFn(func(string) (string, bool){ |
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Should this one have used noLookupFn as well?
But perhaps instead of a dummy function, pass nil as lookup-function, then where it's executed, check if it's nil and if so, skip executing?
Signed-off-by: Ulysses Souza <ulyssessouza@gmail.com>
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Signed-off-by: Ulysses Souza <ulyssessouza@gmail.com>
Signed-off-by: Ulysses Souza <ulyssessouza@gmail.com>
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| if len(line) == 0 { | ||
| err = errors.New("zero length string") | ||
| return | ||
| } | ||
| if lookupFn == nil { | ||
| lookupFn = noLookupFn | ||
| } | ||
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| // ditch the comments (but keep quoted hashes) | ||
| if strings.Contains(line, "#") { |
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This was already there, but looks tricky (thinking of things like ${FOO##something}) https://pubs.opengroup.org/onlinepubs/009604499/utilities/xcu_chap02.html
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| key = exportRegex.ReplaceAllString(splitString[0], "$1") | ||
| if len(splitString) != 2 { | ||
| err = errors.New("Can't separate key from value") |
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errors should not start with a capital; perhaps change "Can't" to "failed to"
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| // Parse the value | ||
| value = parseValue(splitString[1], envMap) | ||
| return | ||
| } | ||
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| func validateVariableName(key string) error { |
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Did we actually need a validation for this? Note that there's no strict rules for variable names; this regex would also exclude Windows %VARIABLE%.
We made this mistake in the Docker Engine, and had to revert; moby/moby#16608
Generally, I would consider the variable name to be:
- "anything" before the
=(if present) - except when starting with
#(comment) - and white space stripped
To be a "valid" variable.
Code that consumes this library can decide what to do with those (if anything); eg for docker we pass any variable to the runtime, and have the kernel/shell decide if it's accepted.
This adds mirror functions to resolve inherited variables
with a lookup function.