#!/bin/sh

for script in /.singularity.d/env/*.sh; do
    if [ -f "$script" ]; then
        . "$script"
    fi
done

# See https://github.com/sylabs/singularity/issues/2721,
# as bash is often used as the current shell it may confuse
# users when entering in singularity container via -s /bin/bash
# implying to override PS1 set by singularity and we may end up
# with a shell prompt identical to the host one, so we force PS1
# through bash PROMPT_COMMAND
if test -z "${PROMPT_COMMAND:-}"; then
    export PROMPT_COMMAND="PS1=\"${PS1}\"; unset PROMPT_COMMAND"
else
    export PROMPT_COMMAND="${PROMPT_COMMAND:-}; PROMPT_COMMAND=\"\${PROMPT_COMMAND%%; PROMPT_COMMAND=*}\"; PS1=\"${PS1}\""
fi

if test -n "$SINGULARITY_SHELL" -a -x "$SINGULARITY_SHELL"; then
    exec $SINGULARITY_SHELL "$@"

    echo "ERROR: Failed running shell as defined by '\$SINGULARITY_SHELL'" 1>&2
    exit 1

elif test -x /bin/bash; then
    SHELL=/bin/bash
    PS1="Singularity $SINGULARITY_NAME:\\w> "
    export SHELL PS1
    exec /bin/bash --norc "$@"
elif test -x /bin/sh; then
    SHELL=/bin/sh
    export SHELL
    exec /bin/sh "$@"
else
    echo "ERROR: /bin/sh does not exist in container" 1>&2
fi
exit 1