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enter_chroot: add support for git object pool indirection

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This adds repo --references awareness (which maps down to git shared object
pools; see git clone -s); specifically, it sets up the appropriate indirection
bindings back to the actual shared source for use from within the chroot.

Note that the approach is a bit complex, but it's required complexity- via
this approach the references are accessible both from within, and without
the chroot.

BUG=chromium-os:19939
TEST=cbuildbot x86-generic-full --clobber --notests --nouprev
TEST=cbuildbot x86-generic-full --notests --nouprev
CQ-DEPEND=I986f17503dc154234ecadd90f6975d7164117cdb

Change-Id: I8498863010cefe0bf5b8f20350fa45a5f2a093d3
Reviewed-on: https://gerrit.chromium.org/gerrit/13467
Tested-by: Brian Harring <ferringb@chromium.org>
Reviewed-by: David James <davidjames@chromium.org>
Commit-Ready: Brian Harring <ferringb@chromium.org>
This commit is contained in:
Brian Harring 2011-12-23 04:21:33 -08:00 committed by Gerrit
parent 104d20d8ea
commit dd7d7939e0
1 changed files with 38 additions and 0 deletions
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38
sdk_lib/enter_chroot.sh
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@ -250,6 +250,44 @@ function setup_env {
fi
queue_mount "${FLAGS_trunk}" "--bind" "${CHROOT_TRUNK_DIR}"
debug "Setting up referenced repositories if required."
REFERENCE_DIR=$(git config --file \
"${FLAGS_trunk}/.repo/manifests.git/config" \
repo.reference)
if [ -n "${REFERENCE_DIR}" ]; then
IFS=$'\n';
required=( $( "${FLAGS_trunk}/chromite/lib/rewrite_git_alternates.py" \
"${FLAGS_trunk}" "${REFERENCE_DIR}" "${CHROOT_TRUNK_DIR}" ) )
unset IFS
queue_mount "${FLAGS_trunk}/.repo/chroot/alternates" --bind \
"${CHROOT_TRUNK_DIR}/.repo/alternates"
# Note that as we're bringing up each referened repo, we also
# mount bind an empty directory over its alternates. This is
# required to suppress git from tracing through it- we already
# specify the required alternates for CHROOT_TRUNK_DIR, no point
# in having git try recursing through each on their own.
#
# Finally note that if you're unfamiliar w/ chroot/vfs semantics,
# the bind is visible only w/in the chroot.
mkdir -p ${FLAGS_trunk}/.repo/chroot/empty
position=1
for x in "${required[@]}"; do
base="${CHROOT_TRUNK_DIR}/.repo/chroot/external${position}"
queue_mount "${x}" "--bind" "${base}"
if [ -e "${x}/.repo/alternates" ]; then
queue_mount "${FLAGS_trunk}/.repo/chroot/empty" "--bind" \
"${base}/.repo/alternates"
fi
position=$(( ${position} + 1 ))
done
unset required position base
fi
unset REFERENCE_DIR
if [ $FLAGS_ssh_agent -eq $FLAGS_TRUE ]; then
if [ -n "${SSH_AUTH_SOCK}" -a -d "${HOME}/.ssh" ]; then
TARGET_DIR="${FLAGS_chroot}/home/${USER}/.ssh"