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  • r

    rough-minister-58256

    12/05/2017, 8:31 PM
    its really about layered composition all the way down
  • w

    witty-crayon-22786

    12/05/2017, 8:31 PM
    but that wouldn't allow for tagging... so every line is a new layer, but you can only a tag a file
  • r

    rough-minister-58256

    12/05/2017, 8:31 PM
    derive from some image, add layers, derive from that, add more
  • r

    rough-minister-58256

    12/05/2017, 8:31 PM
    you can tag any operation
  • e

    enough-analyst-54434

    12/05/2017, 8:31 PM
    yes, ... by sane means
  • w

    witty-crayon-22786

    12/05/2017, 8:32 PM
    ...because the tag is a computed thing
  • w

    witty-crayon-22786

    12/05/2017, 8:32 PM
    the fingerprint
  • e

    enough-analyst-54434

    12/05/2017, 8:32 PM
    Basically - no one tags layers
  • r

    rough-minister-58256

    12/05/2017, 8:32 PM
    yeah
  • e

    enough-analyst-54434

    12/05/2017, 8:32 PM
    it would be too confusing - outside normal use of the toolset
  • r

    rough-minister-58256

    12/05/2017, 8:33 PM
    you’re generally 
    docker build . && docker tag <final id> x
  • e

    enough-analyst-54434

    12/05/2017, 8:33 PM
    instead people factor out docker files and use FROM
  • r

    rough-minister-58256

    12/05/2017, 8:33 PM
    where 
    docker build
    does everything in the 
    Dockerfile
  • w

    witty-crayon-22786

    12/05/2017, 8:33 PM
    yea, i get it.
  • r

    rough-minister-58256

    12/05/2017, 8:33 PM
    for repeatability
  • w

    witty-crayon-22786

    12/05/2017, 8:34 PM
    just trying to understand why cacheability requires multiple files.
  • w

    witty-crayon-22786

    12/05/2017, 8:34 PM
    at a fundamental level, it wouldn't.
  • w

    witty-crayon-22786

    12/05/2017, 8:34 PM
    missing commands, weird UX i guess.
  • r

    rough-minister-58256

    12/05/2017, 8:34 PM
    theres no partial docker build afaik, so tagging sub-build shas like John says would be weird generally
  • e

    enough-analyst-54434

    12/05/2017, 8:34 PM
    it doesn't!
  • e

    enough-analyst-54434

    12/05/2017, 8:34 PM
    but we 
    RUN useradd -d /travis/home -g ${TRAVIS_GROUP} --uid ${TRAVIS_UID} ${TRAVIS_USER}
  • e

    enough-analyst-54434

    12/05/2017, 8:34 PM
    that can only be dne on travis
  • e

    enough-analyst-54434

    12/05/2017, 8:35 PM
    the rest - jdk install - is heavy and we can do ahead of time
  • w

    witty-crayon-22786

    12/05/2017, 8:35 PM
    @enough-analyst-54434: sorry, understood re: local cache
  • w

    witty-crayon-22786

    12/05/2017, 8:35 PM
    but it's the remote cache i care about
  • w

    witty-crayon-22786

    12/05/2017, 8:35 PM
    anyway, thanks: this has been helpful
  • a

    average-vr-56795

    12/05/2017, 9:04 PM
    (Note that Docker "repeatability" is kind of sketchy, because it shoves timestamps all over the place, which I hear is one of the things the way k8s builds has over docker)
  • w

    witty-crayon-22786

    12/05/2017, 9:06 PM
    ...also, i think i see what you were getting at John... each command/layer is producing a fingerprint, so you could tag any random command/layer if you wanted. i think the issue is just that you'd then need some UX like the 
    TAG
    thing above to "hit" the cache
  • w

    witty-crayon-22786

    12/05/2017, 9:16 PM
    i haven't profiled watchman to see what it is doing during startup (around 30+ seconds?) but i do wonder whether it is fundamental
  • w

    witty-crayon-22786

    12/05/2017, 9:17 PM
    it emits a message containing 
    431552
    files, which implies that it's actually doing an fs walk
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