As described in the commit that added this function, this fixes one
quite annoying bug and one at least in-principle bug:
* On Windows, the simple version (lacking `git update-index
--refresh`) routinely gives false positives, making the tools
that rely on it basically unusable.
* If you have uncommitted changes in the index but manage to have
the worktree nevevertheless match HEAD, the simple version will
give a false negative and we'd blow away those changes.
The Git commands we're invoking to do the real work are useful to
print, for transparency to see what's happening and that there's no
magic here.
The boring shell stuff like `remote=${2:-"upstream"}` is not so
helpful, and nor is the rather arcane and in any case read-only
command `git diff-index --quiet HEAD`. Those only add noise that
obscures the interesting parts. So, move the `set -x` down to when
we're done with the boring preparatory stuff and ready to perform
the commands that do the work.
/bin/sh and /usr/bin/env are the only two binaries that NixOS provides
at a fixed path (outside a buildFHSUserEnv sandbox).
This discussion was split from #11004.
Signed-off-by: Anders Kaseorg <andersk@mit.edu>
Greg Price
Anders Kaseorg
Rohitt Vashishtha