Adam Mercer <ramercer@xxxxxxxxx> writes:
> git diff-index --quiet HEAD
It is expected that a Porcelain script that implements a custom feature
may call diff-files, diff-index and other plumbing commands many times
during its lifetime, and that it knows what it is doing (namely, when
it touches the working tree itself and why).
For this reason, most plumbing commands do not refresh the cached stat
information in the index. A Porcelain script is responsible for running
"update-index --refresh" once before it makes a call that cached stat
information matters, and as long as it doesn't touch the files in the
working tree, it doesn't have to run it again and again.
Porcelain commands like "git diff" that are expected to be run directly by
the end user cannot assume that, so they do not optimize---they typically
refresh the cached stat information by themselves internally whey they
start up.
Your Porcelain script should look something like:
git update-index --refresh
git diff-files -q || { echo "modified working tree"; exit 1 }
git diff-index --cached -q HEAD || { echo "modified index"; exit 2 }
See contrib/examples/*.sh for examples.
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