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bake: add formattimestamp and tighten unix timestamp parsing

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Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>
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CrazyMax
2026-03-25 11:46:49 +01:00
parent 11395747a6
commit 2798e134e9
3 changed files with 207 additions and 25 deletions
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docs/bake-stdlib.md
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@@ -38,8 +38,9 @@ title: Bake standard library functions
| [`flatten`](#flatten) | Transforms a list, set, or tuple value into a tuple by replacing any given elements that are themselves sequences with a flattened tuple of all of the nested elements concatenated together. |
| [`floor`](#floor) | Returns the greatest whole number that is less than or equal to the given value. |
| [`format`](#format) | Constructs a string by applying formatting verbs to a series of arguments, using a similar syntax to the C function \"printf\". |
| [`formatdate`](#formatdate) | Formats a timestamp given in RFC 3339 syntax into another timestamp in some other machine-oriented time syntax, as described in the format string. |
| [`formatdate`](#formatdate) | Deprecated: use formattimestamp instead. Formats a timestamp given in RFC 3339 syntax into another timestamp in some other machine-oriented time syntax, as described in the format string. |
| [`formatlist`](#formatlist) | Constructs a list of strings by applying formatting verbs to a series of arguments, using a similar syntax to the C function \"printf\". |
| [`formattimestamp`](#formattimestamp) | Formats a timestamp string in RFC 3339 syntax or a unix timestamp integer into another timestamp in some other machine-oriented time syntax, as described in the format string. |
| [`greaterthan`](#greaterthan) | Returns true if and only if the second number is greater than the first. |
| [`greaterthanorequalto`](#greaterthanorequalto) | Returns true if and only if the second number is greater than or equal to the first. |
| [`hasindex`](#hasindex) | Returns true if if the given collection can be indexed with the given key without producing an error, or false otherwise. |
@@ -533,6 +534,10 @@ target "webapp-dev" {
## `formatdate`
> [!WARNING]
> Deprecated: use `formattimestamp` instead. `formatdate` only accepts RFC3339
> timestamp strings.
```hcl
# docker-bake.hcl
target "webapp-dev" {
@@ -544,6 +549,28 @@ target "webapp-dev" {
}
```
## `formattimestamp`
Formats either an RFC3339 timestamp string or a unix timestamp integer.
```hcl
# docker-bake.hcl
variable "SOURCE_DATE_EPOCH" {
type = number
default = 1690328596
}
target "default" {
dockerfile = "Dockerfile"
labels = {
"org.opencontainers.image.created" = formattimestamp("YYYY-MM-DD'T'hh:mm:ssZ", SOURCE_DATE_EPOCH) # => "2023-07-25T23:43:16Z"
}
args = {
build_date = formattimestamp("YYYY-MM-DD", "2025-09-16T12:00:00Z") # => "2025-09-16"
}
}
```
## `formatlist`
```hcl