Every patch verb outside the series work is real. check reads the working
tree through checkpatch's stdin, which is the only way it can read one,
since --git with no revision dies; format puts --fix-inplace's output back
into the tree after setting the uncommitted change aside, and restores it
if the fix does not apply; commit and create sit on git; create writes a
mail-formatted patch, because git send-email refuses a bare diff with "No
subject line"; submit splits get_maintainer.pl's roles into To and Cc,
prints the command line it is about to run, and only sends when --dry-run
is off; update re-rolls a patch by renaming it and does nothing at the
revision it is already at.
git.rs grows the plumbing those verbs stand on: diff_unstaged,
format_patch, apply, commit, rev_parse. apply feeds the patch in on stdin,
so a fixed patch stays in memory until it is known to apply.
tests/ holds a fixture kernel tree, so the suite needs no kernel tree, no
network, and no configured git send-email. The two tests that do want the
host's own checkpatch and get_maintainer are ignored unless asked for, and
one of them earned its place immediately: checkpatch's --file means "this
argument is source code", so checking a patch with it reported a dirty
patch as clean, 8004 lines and no errors. Patchfile mode is checkpatch's
default and the path now stands alone.
patch check also takes --rev, which is how a committed range gets checked.
Checked with cargo fmt --check, cargo clippy --all-targets -- -D warnings,
cargo test, and cargo doc --no-deps.
