From 19afad50f58b15b57ae3da673b9ba750a641350f Mon Sep 17 00:00:00 2001 From: "Yann E. MORIN" Date: Thu, 3 Jul 2014 21:36:20 +0200 Subject: pkg-infra: don't use DL_DIR as scratchpad for temporary downloads DL_DIR can be a very precious place for some users: they use it to store all the downloaded archives to share across all their Buildroot (and maybe non-Buildroot) builds. We do not want to trash this location with our temporary downloads (e.g. git, Hg, svn, cvs repository clones/checkouts, or wget, bzr tep tarballs). Turns out that we already have some kind of scratchpad, the BUILD_DIR. Although it is not really a disposable location, that's the best we have so far. Also, we create the temporary tarballs with mktemp using the final tarball, as template, since we want the temporary to be on the same filesystem as the final location, so the 'mv' is just a plain, atomic rename(2), and we are not left with a half-copied file as the final location. Using mktemp ensures all temp file names are unique, so it allows for parallel downloads from different build dirs at the same time, without cloberring each downloads. Note: we're using neither ${TMP} nor ${TMPDIR} since they are shared locations, sometime with little place (eg. tmpfs), and some of the repositories we clone/checkout can be very big. Signed-off-by: "Yann E. MORIN" Cc: Samuel Martin Cc: Arnout Vandecappelle Cc: Thomas Petazzoni Cc: Thomas De Schampheleire Tested-by: Thomas De Schampheleire [tested a particular scenario that used to fail: two separate builds using a shared DL_DIR, ccache enabled, so that they run almost synchronously. These would download the same file at the same time, corrupting each other. With the patches in this series, all works fine.] Signed-off-by: Peter Korsgaard --- support/download/svn | 33 ++++++++++++++++++++++++++------- 1 file changed, 26 insertions(+), 7 deletions(-) (limited to 'support/download/svn') diff --git a/support/download/svn b/support/download/svn index 142a8d8911..39cbbcb904 100755 --- a/support/download/svn +++ b/support/download/svn @@ -10,16 +10,35 @@ set -e # $3: package's basename (eg. foobar-1.2.3) # $4: output file # And this environment: -# SVN : the svn command to call -# BR2_DL_DIR: path to Buildroot's download dir +# SVN : the svn command to call +# BUILD_DIR: path to Buildroot's build dir repo="${1}" rev="${2}" basename="${3}" output="${4}" -pushd "${BR2_DL_DIR}" >/dev/null -${SVN} export "${repo}@${rev}" "${basename}" -tar czf "${output}" "${basename}" -rm -rf "${basename}" -popd >/dev/null +repodir="${basename}.tmp-svn-checkout" +tmp_output="$( mktemp "${output}.XXXXXX" )" + +cd "${BUILD_DIR}" +# Remove leftovers from a previous failed run +rm -rf "${repodir}" + +# Play tic-tac-toe with temp files +# - first, we download to a trashable location (the build-dir) +# - then we create a temporary tarball in the final location, so it is +# on the same filesystem as the final file +# - finally, we atomically rename to the final file + +ret=1 +if ${SVN} export "${repo}@${rev}" "${repodir}"; then + if tar czf "${tmp_output}" "${repodir}"; then + mv "${tmp_output}" "${output}" + ret=0 + fi +fi + +# Cleanup +rm -rf "${repodir}" "${tmp_output}" +exit ${ret} -- cgit v1.2.3