Difference between && and `set -ex` in Dockerfiles
This isn't specific to Docker; it's just regular shell syntax used in the RUN command. set -e causes the script to exit if any command fails, while && only runs its right-hand command if the left-hand command does not fail. So in both
set -efoobarand
foo && barbar will only run if foo succeeds.
So, the two are identical if the entire script consists of a single list command ... && ... && ... where a command only runs if every previous command succeeds. An example of how they would differ:
set -eecho onefalseecho twoecho threeHere, echo two and echo three would never run. But in
echo one && false && echo twoecho threethe echo three would still run, because only echo two was "guarded" by the && preceding it.