Refer users to git-rev-parse for revision specification syntax.

diff --git a/git-sh-setup.sh b/git-sh-setup.sh
index d5bfa62dee0e85d404f955edefd2151e8c0e7aab..6b1c1423ebb7fde53aae566fa09211d331c422bc 100755 (executable)
--- a/git-sh-setup.sh
+++ b/git-sh-setup.sh
@@ -1,10 +1,9 @@
 #!/bin/sh
 #
-# Set up GIT_DIR and GIT_OBJECT_DIRECTORY
-# and return true if everything looks ok
-#
-: ${GIT_DIR=.git}
-: ${GIT_OBJECT_DIRECTORY="$GIT_DIR/objects"}
+# This is included in commands that either have to be run from the toplevel
+# of the repository, or with GIT_DIR environment variable properly.
+# If the GIT_DIR does not look like the right correct git-repository,
+# it dies.
 
 # Having this variable in your environment would break scripts because
 # you would cause "cd" to be be taken to unexpected places.  If you
@@ -13,21 +12,71 @@
 unset CDPATH
 
 die() {
-       echo "$@" >&2
+       echo >&2 "$@"
        exit 1
 }
 
-check_clean_tree() {
-    dirty1_=`git-update-index -q --refresh` && {
-    dirty2_=`git-diff-index --name-only --cached HEAD`
-    case "$dirty2_" in '') : ;; *) (exit 1) ;; esac
-    } || {
-       echo >&2 "$dirty1_"
-       echo "$dirty2_" | sed >&2 -e 's/^/modified: /'
-       (exit 1)
-    }
+usage() {
+       die "Usage: $0 $USAGE"
+}
+
+set_reflog_action() {
+       if [ -z "${GIT_REFLOG_ACTION:+set}" ]
+       then
+               GIT_REFLOG_ACTION="$*"
+               export GIT_REFLOG_ACTION
+       fi
+}
+
+is_bare_repository () {
+       git-repo-config --bool --get core.bare ||
+       case "$GIT_DIR" in
+       .git | */.git) echo false ;;
+       *) echo true ;;
+       esac
+}
+
+cd_to_toplevel () {
+       cdup=$(git-rev-parse --show-cdup)
+       if test ! -z "$cdup"
+       then
+               cd "$cdup" || {
+                       echo >&2 "Cannot chdir to $cdup, the toplevel of the working tree"
+                       exit 1
+               }
+       fi
+}
+
+require_work_tree () {
+       test $(is_bare_repository) = false ||
+       die "fatal: $0 cannot be used without a working tree."
 }
 
-[ -h "$GIT_DIR/HEAD" ] &&
-[ -d "$GIT_DIR/refs" ] &&
-[ -d "$GIT_OBJECT_DIRECTORY/00" ]
+if [ -z "$LONG_USAGE" ]
+then
+       LONG_USAGE="Usage: $0 $USAGE"
+else
+       LONG_USAGE="Usage: $0 $USAGE
+
+$LONG_USAGE"
+fi
+
+case "$1" in
+       -h|--h|--he|--hel|--help)
+       echo "$LONG_USAGE"
+       exit
+esac
+
+# Make sure we are in a valid repository of a vintage we understand.
+if [ -z "$SUBDIRECTORY_OK" ]
+then
+       : ${GIT_DIR=.git}
+       GIT_DIR=$(GIT_DIR="$GIT_DIR" git-rev-parse --git-dir) || {
+               exit=$?
+               echo >&2 "You need to run this command from the toplevel of the working tree."
+               exit $exit
+       }
+else
+       GIT_DIR=$(git-rev-parse --git-dir) || exit
+fi
+: ${GIT_OBJECT_DIRECTORY="$GIT_DIR/objects"}