user-manual: start revising "internals" chapter

diff --git a/git-bisect.sh b/git-bisect.sh
index 936b4a4b835e51410ccfbb37f4205accbade4422..11313a7949909f61f47ccc061cfc6390b225c630 100755 (executable)
--- a/git-bisect.sh
+++ b/git-bisect.sh
@@ -123,7 +123,15 @@ bisect_next_check() {
        case "$next_ok,$1" in
        no,) false ;;
        no,fail)
-           echo >&2 'You need to give me at least one good and one bad revisions.'
+           THEN=''
+           test -d "$GIT_DIR/refs/bisect" || {
+               echo >&2 'You need to start by "git bisect start".'
+               THEN='then '
+           }
+           echo >&2 'You '$THEN'need to give me at least one good' \
+               'and one bad revisions.'
+           echo >&2 '(You can use "git bisect bad" and' \
+               '"git bisect good" for that.)'
            exit 1 ;;
        *)
            true ;;
@@ -173,7 +181,7 @@ bisect_reset() {
           else
               branch=master
           fi ;;
-       1) test -f "$GIT_DIR/refs/heads/$1" || {
+       1) git-show-ref --verify --quiet -- "refs/heads/$1" || {
               echo >&2 "$1 does not seem to be a valid branch"
               exit 1
           }
@@ -223,6 +231,8 @@ bisect_replay () {
 }
 
 bisect_run () {
+    bisect_next_check fail
+
     while true
     do
       echo "running $@"