build: add experimental support for print flag

Print flag can be used to make additional information
requests about the build and print their results.

Currently Dockerfile supports: outline, targets, subrequests.describe

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
This commit is contained in:
Tonis Tiigi
2022-05-04 18:48:50 -07:00
parent 17dc0e1108
commit eefa8188e1
98 changed files with 8536 additions and 3339 deletions

View File

@ -188,7 +188,9 @@ func FromIncomingContext(ctx context.Context) (MD, bool) {
// map, and there's no guarantee that the MD attached to the context is
// created using our helper functions.
key := strings.ToLower(k)
out[key] = v
s := make([]string, len(v))
copy(s, v)
out[key] = s
}
return out, true
}
@ -226,7 +228,9 @@ func FromOutgoingContext(ctx context.Context) (MD, bool) {
// map, and there's no guarantee that the MD attached to the context is
// created using our helper functions.
key := strings.ToLower(k)
out[key] = v
s := make([]string, len(v))
copy(s, v)
out[key] = s
}
for _, added := range raw.added {
if len(added)%2 == 1 {