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t/lib-commit-graph.sh: avoid directory change in graph_git_behavior()

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The `graph_git_behavior()` helper asserts that a number of common Git
operations (such as `git log --oneline`, `git log --topo-order`, etc.)
produce identical output regardless of whether or not a commit-graph is
in use.

This helper takes as its second argument the location (relative to the
`$TRASH_DIRECTORY`) of the Git repostiory under test. In order to run
each of its commands within that repository, it first changes into that
directory, without the use of a sub-shell.

This pollutes future tests which expect to be run in the top-level
`$TRASH_DIRECTORY` as usual. We could wrap `graph_git_behavior()` in a
sub-shell, like:

    graph_git_behavior() {
      # ...
      (
        cd "$TRASH_DIRECTORY/$DIR" &&
        graph_git_two_modesl
      )
    }

, but since we're invoking git directly, we can pass along a "-C $DIR"
when "$DIR" is non-empty.

Note, however, that until the remaining callers are cleaned up to avoid
changing working directories outside of a sub-shell, that we need to
ensure that we are operating in the top-level $TRASH_DIRECTORY. The
inner-subshell will go away in a future commit once it is no longer
necessary.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Taylor Blau 2023-07-24 12:39:25 -04:00 committed by Junio C Hamano
parent c355b64176
commit a953d2b628
1 changed files with 15 additions and 6 deletions
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21
t/lib-commit-graph.sh
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@ -14,18 +14,27 @@ graph_git_two_modes() {
test_cmp expect output
}
# graph_git_behavior <name> <directory> <branch> <compare>
#
# Ensures that a handful of traversal operations produce the same
# results with and without the commit-graph in use.
#
# NOTE: it is a bug to call this function with <directory> containing
# any characters in $IFS.
graph_git_behavior() {
MSG=$1
DIR=$2
BRANCH=$3
COMPARE=$4
test_expect_success "check normal git operations: $MSG" '
cd "$TRASH_DIRECTORY/$DIR" &&
graph_git_two_modes "log --oneline $BRANCH" &&
graph_git_two_modes "log --topo-order $BRANCH" &&
graph_git_two_modes "log --graph $COMPARE..$BRANCH" &&
graph_git_two_modes "branch -vv" &&
graph_git_two_modes "merge-base -a $BRANCH $COMPARE"
(
cd "$TRASH_DIRECTORY" &&
graph_git_two_modes "${DIR:+-C $DIR} log --oneline $BRANCH" &&
graph_git_two_modes "${DIR:+-C $DIR} log --topo-order $BRANCH" &&
graph_git_two_modes "${DIR:+-C $DIR} log --graph $COMPARE..$BRANCH" &&
graph_git_two_modes "${DIR:+-C $DIR} branch -vv" &&
graph_git_two_modes "${DIR:+-C $DIR} merge-base -a $BRANCH $COMPARE"
)
'
}