From 8cd05ab65a92a592e771a0a1847c7e5505d9a024 Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Fri, 23 May 2014 17:07:24 +0100 Subject: [PATCH] configure: Put tempfiles in a subdir of the build directory When libtool support was added to configure, the new temporary files were left out of the list of files cleaned up on exit; this results in a lot of stale .lo files being left around in /tmp. Worse, libtool creates a /tmp/.libs directory which we can't easily clean up. Put all our temporary files in a single temporary directory created as a subdirectory of the build directory, so we can easily clean it up, and don't need fragile or complicated code for creation to avoid it clashing with temporary directories from other instances of QEMU configure or being subject to attack from adversaries who can write to /tmp. Since the temporaries now live in the build tree, we have no need to jump through hoops with a trap handler to try to remove them when configure exits; this fixes some weird bugs where hitting ^C during a configure run wouldn't actually make it stop, because we would run the trap handler but then not stop. (It is possible to get the trap handler semantics right but it is convoluted largely because of bugs in dash, so it is simpler to just avoid it.) Note that "temporary files go in the build directory, not /tmp" is the way autoconf behaves. Signed-off-by: Peter Maydell Reviewed-by: Eric Blake Signed-off-by: Michael Tokarev --- .gitignore | 1 + configure | 29 ++++++++++++++++------------- 2 files changed, 17 insertions(+), 13 deletions(-) diff --git a/.gitignore b/.gitignore index 8a5270973e..c658613560 100644 --- a/.gitignore +++ b/.gitignore @@ -4,6 +4,7 @@ /config-host.* /config-target.* /config.status +/config-temp /trace/generated-tracers.h /trace/generated-tracers.c /trace/generated-tracers-dtrace.h diff --git a/configure b/configure index 678a1061ad..cde432520d 100755 --- a/configure +++ b/configure @@ -2,26 +2,28 @@ # # qemu configure script (c) 2003 Fabrice Bellard # -# set temporary file name -if test ! -z "$TMPDIR" ; then - TMPDIR1="${TMPDIR}" -elif test ! -z "$TEMPDIR" ; then - TMPDIR1="${TEMPDIR}" -else - TMPDIR1="/tmp" + +# Temporary directory used for files created while +# configure runs. Since it is in the build directory +# we can safely blow away any previous version of it +# (and we need not jump through hoops to try to delete +# it when configure exits.) +TMPDIR1="config-temp" +rm -rf "${TMPDIR1}" +mkdir -p "${TMPDIR1}" +if [ $? -ne 0 ]; then + echo "ERROR: failed to create temporary directory" + exit 1 fi -TMPC="${TMPDIR1}/qemu-conf-${RANDOM}-$$-${RANDOM}.c" -TMPB="qemu-conf-${RANDOM}-$$-${RANDOM}" +TMPB="qemu-conf" +TMPC="${TMPDIR1}/${TMPB}.c" TMPO="${TMPDIR1}/${TMPB}.o" TMPCXX="${TMPDIR1}/${TMPB}.cxx" TMPL="${TMPDIR1}/${TMPB}.lo" TMPA="${TMPDIR1}/lib${TMPB}.la" -TMPE="${TMPDIR1}/qemu-conf-${RANDOM}-$$-${RANDOM}.exe" +TMPE="${TMPDIR1}/${TMPB}.exe" -# NB: do not call "exit" in the trap handler; this is buggy with some shells; -# see <1285349658-3122-1-git-send-email-loic.minier@linaro.org> -trap "rm -f $TMPC $TMPO $TMPCXX $TMPE" EXIT INT QUIT TERM rm -f config.log # Print a helpful header at the top of config.log @@ -5235,3 +5237,4 @@ printf " '%s'" "$0" "$@" >>config.status echo >>config.status chmod +x config.status +rm -r "$TMPDIR1"