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doc/demo: Clone and use mbuto in init namespace

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...and not in pasta's namespace: the fakeroot(1) version shipping
with (at least) Fedora 36 assumes "nested" operation as it sees that
the UID is 0, and claims it's not supported.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio 2022-09-17 01:14:27 +02:00
parent efd9d9b456
commit 8627a2da52
1 changed files with 17 additions and 5 deletions
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22
doc/demo.sh
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@ -128,6 +128,19 @@ start_pasta_delayed() {
exit 0 exit 0
} }
# start_mbuto_delayed() - Run mbuto once, and if, $DEMO_DIR/mbuto.wait is gone
start_mbuto_delayed() {
trap '' EXIT
while [ -d "${DEMO_DIR}/mbuto.wait" ]; do sleep 1; done
cmd git -C "${DEMO_DIR}" clone git://mbuto.sh/mbuto
echo
cmd "${DEMO_DIR}/mbuto/mbuto" \
-p "$(realpath "${0}")" -f "${DEMO_DIR}/demo.img"
mkdir "${DEMO_DIR}/mbuto.done"
exit 0
}
# into_ns() - Entry point and demo script to run inside new namespace # into_ns() - Entry point and demo script to run inside new namespace
into_ns() { into_ns() {
echo "We're in the new namespace now." echo "We're in the new namespace now."
@ -204,11 +217,8 @@ into_ns() {
exit 0 exit 0
fi fi
cmd git -C "${DEMO_DIR}" clone git://mbuto.sh/mbuto rmdir "${DEMO_DIR}/mbuto.wait"
echo while [ ! -d "${DEMO_DIR}/mbuto.done" ]; do sleep 1; done
cmd "${DEMO_DIR}/mbuto/mbuto" \
-p "$(realpath "${0}")" -f "${DEMO_DIR}/demo.img"
echo
echo "The guest image is ready. The next step will start the guest." echo "The guest image is ready. The next step will start the guest."
echo "Use ^C to terminate it." echo "Use ^C to terminate it."
next next
@ -229,6 +239,7 @@ trap cleanup EXIT INT
DEMO_DIR="$(mktemp -d)" DEMO_DIR="$(mktemp -d)"
mkdir "${DEMO_DIR}/pasta.wait" mkdir "${DEMO_DIR}/pasta.wait"
mkdir "${DEMO_DIR}/mbuto.wait"
echo "This script sets up a network and user namespace using pasta(1), then" echo "This script sets up a network and user namespace using pasta(1), then"
echo "starts a virtual machine in it, connected via passt(1), pausing at every" echo "starts a virtual machine in it, connected via passt(1), pausing at every"
@ -242,6 +253,7 @@ echo "of this script from there."
next next
start_pasta_delayed & start_pasta_delayed &
start_mbuto_delayed &
DEMO_DIR="${DEMO_DIR}" cmd unshare -rUn "${0}" into_ns DEMO_DIR="${DEMO_DIR}" cmd unshare -rUn "${0}" into_ns
exit 0 exit 0