Remove TRACK_DEPENDS

This was added in 2012 with I89677fd54635e82b10ab674ddeb9ffb3f1a755f0,
but I can not see it being used anywhere currently.

It's use of virtualenv's has become problematic in a python2
deprecated world, but since it is not used, remove it to avoid further
confusion.

Change-Id: I65d44d24f449436ca6229928eee2c5a021793055

functions-common

@@ -27,7 +27,6 @@
 # - ``RECLONE``
 # - ``REQUIREMENTS_DIR``
 # - ``STACK_USER``
-# - ``TRACK_DEPENDS``
 # - ``http_proxy``, ``https_proxy``, ``no_proxy``
 #
 
@@ -44,7 +43,6 @@ declare -A -g GITREPO
 declare -A -g GITBRANCH
 declare -A -g GITDIR
 
-TRACK_DEPENDS=${TRACK_DEPENDS:-False}
 KILL_PATH="$(which kill)"
 
 # Save these variables to .stackenv
@@ -2075,11 +2073,7 @@ function _safe_permission_operation {
         return 0
     fi
 
-    if [[ $TRACK_DEPENDS = True ]]; then
-        sudo_cmd="env"
-    else
     sudo_cmd="sudo"
-    fi
 
     $xtrace
     $sudo_cmd $@

inc/python

@@ -175,7 +175,7 @@ function disable_python3_package {
 
 # Wrapper for ``pip install`` to set cache and proxy environment variables
 # Uses globals ``OFFLINE``, ``PIP_VIRTUAL_ENV``,
-# ``PIP_UPGRADE``, ``TRACK_DEPENDS``, ``*_proxy``,
+# ``PIP_UPGRADE``, ``*_proxy``,
 # Usage:
 #  pip_install pip_arguments
 function pip_install {
@@ -219,14 +219,6 @@ function pip_install {
     # this works (for now...)
     local package_dir=${!#%\[*\]}
 
-    if [[ $TRACK_DEPENDS = True && ! "$@" =~ virtualenv ]]; then
-        # TRACK_DEPENDS=True installation creates a circular dependency when
-        # we attempt to install virtualenv into a virtualenv, so we must global
-        # that installation.
-        source $DEST/.venv/bin/activate
-        local cmd_pip=$DEST/.venv/bin/pip
-        local sudo_pip="env"
-    else
     if [[ -n ${PIP_VIRTUAL_ENV:=} && -d ${PIP_VIRTUAL_ENV} ]]; then
         local cmd_pip=$PIP_VIRTUAL_ENV/bin/pip
         local sudo_pip="env"
@@ -252,7 +244,6 @@ function pip_install {
             fi
         fi
     fi
-    fi
 
     cmd_pip="$cmd_pip install"
     # Always apply constraints

stack.sh

@@ -796,19 +796,6 @@ if [[ "$OFFLINE" != "True" ]]; then
     PYPI_ALTERNATIVE_URL=${PYPI_ALTERNATIVE_URL:-""} $TOP_DIR/tools/install_pip.sh
 fi
 
-TRACK_DEPENDS=${TRACK_DEPENDS:-False}
-
-# Install Python packages into a virtualenv so that we can track them
-if [[ $TRACK_DEPENDS = True ]]; then
-    echo_summary "Installing Python packages into a virtualenv $DEST/.venv"
-    pip_install -U virtualenv
-
-    rm -rf $DEST/.venv
-    virtualenv --system-site-packages $DEST/.venv
-    source $DEST/.venv/bin/activate
-    $DEST/.venv/bin/pip freeze > $DEST/requires-pre-pip
-fi
-
 # Do the ugly hacks for broken packages and distros
 source $TOP_DIR/tools/fixup_stuff.sh
 fixup_all
@@ -997,17 +984,6 @@ fi
 # osc commands. Alias dies with stack.sh.
 install_oscwrap
 
-if [[ $TRACK_DEPENDS = True ]]; then
-    $DEST/.venv/bin/pip freeze > $DEST/requires-post-pip
-    if ! diff -Nru $DEST/requires-pre-pip $DEST/requires-post-pip > $DEST/requires.diff; then
-        echo "Detect some changes for installed packages of pip, in depend tracking mode"
-        cat $DEST/requires.diff
-    fi
-    echo "Ran stack.sh in depend tracking mode, bailing out now"
-    exit 0
-fi
-
-
 # Syslog
 # ------