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bisect: remove "checkout_done" variable used when checking merge bases

Using return values from the following functions:

- check_merge_bases
- check_good_are_ancestors_of_bad

seems simpler.

While at it, let's add some comments to better document the above
functions.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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1 parent c9c4e2d commit 6a54d976f654ef15ce6db7d52c76677dfdd0de6c @chriscool chriscool committed with gitster
Showing with 27 additions and 5 deletions.
  1. +27 −5 git-bisect.sh
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32 git-bisect.sh
@@ -384,6 +384,17 @@ We continue anyway.
EOF
}
+#
+# "check_merge_bases" checks that merge bases are not "bad".
+#
+# - If one is "good", that's good, we have nothing to do.
+# - If one is "bad", it means the user assumed something wrong
+# and we must exit.
+# - If one is "skipped", we can't know but we should warn.
+# - If we don't know, we should check it out and ask the user to test.
+#
+# In the last case we will return 1, and otherwise 0.
+#
check_merge_bases() {
_bad="$1"
_good="$2"
@@ -398,12 +409,20 @@ check_merge_bases() {
handle_skipped_merge_base "$_mb" "$_bad" "$_good"
else
bisect_checkout "$_mb" "a merge base must be tested"
- checkout_done=1
- return
+ return 1
fi
done
+ return 0
}
+#
+# "check_good_are_ancestors_of_bad" checks that all "good" revs are
+# ancestor of the "bad" rev.
+#
+# If that's not the case, we need to check the merge bases.
+# If a merge base must be tested by the user we return 1 and
+# otherwise 0.
+#
check_good_are_ancestors_of_bad() {
test -f "$GIT_DIR/BISECT_ANCESTORS_OK" &&
return
@@ -417,11 +436,13 @@ check_good_are_ancestors_of_bad() {
_side=$(git rev-list $_good ^$_bad)
if test -n "$_side"; then
+ # Return if a checkout was done
check_merge_bases "$_bad" "$_good" "$_skip" || return
- test "$checkout_done" -eq "1" && return
fi
: > "$GIT_DIR/BISECT_ANCESTORS_OK"
+
+ return 0
}
bisect_next() {
@@ -437,8 +458,9 @@ bisect_next() {
"refs/bisect/skip-*" | tr '\012' ' ') &&
# Maybe some merge bases must be tested first
- check_good_are_ancestors_of_bad "$bad" "$good" "$skip" || exit
- test "$checkout_done" -eq "1" && checkout_done='' && return
+ check_good_are_ancestors_of_bad "$bad" "$good" "$skip"
+ # Return now if a checkout has already been done
+ test "$?" -eq "1" && return
# Get bisection information
BISECT_OPT=''

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