/usr/lib/xul-ext/enigmail/wrappers/gpg-agent-wrapper.sh is in enigmail 2:1.8.2-4~deb7u1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | #!/bin/sh
# Wrapper script for launching gpg-agent
GPG_AGENT=$1
TMPFILE=$2
shift 2
$GPG_AGENT "$@" > $TMPFILE 2>&1
exit 0
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