mirror of
https://github.com/opencontainers/runc.git
synced 2026-07-11 06:03:57 +08:00
mount: add support for ridmap and idmap
ridmap indicates that the id mapping should be applied recursively (only
really relevant for rbind mount entries), and idmap indicates that it
should not be applied recursively (the default). If no mappings are
specified for the mount, we use the userns configuration of the
container. This matches the behaviour in the currently-unreleased
runtime-spec.
This includes a minor change to the state.json serialisation format, but
because there has been no released version of runc with commit
fbf183c6f8 ("Add uid and gid mappings to mounts"), we can safely make
this change without affecting running containers. Doing it this way
makes it much easier to handle m.IsIDMapped() and indicating that a
mapping has been specified.
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
This commit is contained in:
Aleksa Sarai
@@ -5,7 +5,6 @@ load helpers
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function setup() {
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OVERFLOW_UID="$(cat /proc/sys/kernel/overflowuid)"
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OVERFLOW_GID="$(cat /proc/sys/kernel/overflowgid)"
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requires root
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requires_kernel 5.12
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@@ -37,12 +36,34 @@ function setup() {
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# Add a symlink-containing source.
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ln -s source-multi1 source-multi1-symlink
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# Add some top-level files in the mount tree.
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mkdir -p mnt-subtree/multi{1,2}
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touch mnt-subtree/{foo,bar,baz}.txt
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chown 100:211 mnt-subtree/foo.txt
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chown 200:222 mnt-subtree/bar.txt
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chown 300:233 mnt-subtree/baz.txt
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mounts_file="$PWD/.all-mounts"
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echo -n >"$mounts_file"
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}
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function teardown() {
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if [ -v mounts_file ]; then
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xargs -n 1 -a "$mounts_file" -- umount -l
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rm -f "$mounts_file"
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fi
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teardown_bundle
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}
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function setup_host_bind_mount() {
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src="$1"
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dst="$2"
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mount --bind "$src" "$dst"
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echo "$dst" >>"$mounts_file"
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}
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function setup_idmap_userns() {
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update_config '.linux.namespaces += [{"type": "user"}]
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| .linux.uidMappings += [{"containerID": 0, "hostID": 100000, "size": 65536}]
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@@ -341,3 +362,331 @@ function setup_idmap_basic_mount() {
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[[ "$output" == *"=/tmp/mount-multi1/bar.txt:2000=2202="* ]]
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[[ "$output" == *"=/tmp/mount-multi1/baz.txt:3000=3303="* ]]
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}
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@test "idmap mount (non-recursive idmap) [userns]" {
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setup_idmap_userns
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setup_host_bind_mount "source-multi1/" "mnt-subtree/multi1"
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setup_host_bind_mount "source-multi2/" "mnt-subtree/multi2"
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update_config '.mounts += [
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{
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"source": "mnt-subtree/",
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"destination": "/tmp/mount-tree",
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"options": ["rbind"],
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"uidMappings": [
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{"containerID": 100, "hostID": 101000, "size": 3},
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{"containerID": 200, "hostID": 102000, "size": 3},
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{"containerID": 300, "hostID": 103000, "size": 3}
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],
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"gidMappings": [
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{"containerID": 210, "hostID": 101100, "size": 10},
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{"containerID": 220, "hostID": 102200, "size": 10},
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{"containerID": 230, "hostID": 103300, "size": 10}
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]
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}
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]'
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update_config '.process.args = ["bash", "-c", "stat -c =%n:%u=%g= /tmp/mount-tree{,/multi1,/multi2}/{foo,bar,baz}.txt"]'
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runc run test_debian
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[ "$status" -eq 0 ]
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[[ "$output" == *"=/tmp/mount-tree/foo.txt:1000=1101="* ]]
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[[ "$output" == *"=/tmp/mount-tree/bar.txt:2000=2202="* ]]
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[[ "$output" == *"=/tmp/mount-tree/baz.txt:3000=3303="* ]]
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# Because we used "idmap", the child mounts were not remapped recursively.
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[[ "$output" == *"=/tmp/mount-tree/multi1/foo.txt:$OVERFLOW_UID=$OVERFLOW_GID="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi1/bar.txt:$OVERFLOW_UID=$OVERFLOW_GID="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi1/baz.txt:$OVERFLOW_UID=$OVERFLOW_GID="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi2/foo.txt:$OVERFLOW_UID=$OVERFLOW_GID="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi2/bar.txt:$OVERFLOW_UID=$OVERFLOW_GID="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi2/baz.txt:$OVERFLOW_UID=$OVERFLOW_GID="* ]]
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}
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@test "idmap mount (non-recursive idmap) [no userns]" {
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setup_host_bind_mount "source-multi1/" "mnt-subtree/multi1"
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setup_host_bind_mount "source-multi2/" "mnt-subtree/multi2"
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update_config '.mounts += [
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{
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"source": "mnt-subtree/",
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"destination": "/tmp/mount-tree",
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"options": ["rbind"],
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"uidMappings": [
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{"containerID": 100, "hostID": 101000, "size": 3},
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{"containerID": 200, "hostID": 102000, "size": 3},
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{"containerID": 300, "hostID": 103000, "size": 3}
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],
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"gidMappings": [
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{"containerID": 210, "hostID": 101100, "size": 10},
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{"containerID": 220, "hostID": 102200, "size": 10},
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{"containerID": 230, "hostID": 103300, "size": 10}
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]
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}
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]'
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update_config '.process.args = ["bash", "-c", "stat -c =%n:%u=%g= /tmp/mount-tree{,/multi1,/multi2}/{foo,bar,baz}.txt"]'
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runc run test_debian
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[ "$status" -eq 0 ]
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[[ "$output" == *"=/tmp/mount-tree/foo.txt:101000=101101="* ]]
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[[ "$output" == *"=/tmp/mount-tree/bar.txt:102000=102202="* ]]
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[[ "$output" == *"=/tmp/mount-tree/baz.txt:103000=103303="* ]]
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# Because we used "idmap", the child mounts were not remapped recursively.
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[[ "$output" == *"=/tmp/mount-tree/multi1/foo.txt:100=211="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi1/bar.txt:101=222="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi1/baz.txt:102=233="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi2/foo.txt:200=211="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi2/bar.txt:201=222="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi2/baz.txt:202=233="* ]]
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}
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@test "idmap mount (idmap flag) [userns]" {
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setup_idmap_userns
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setup_host_bind_mount "source-multi1/" "mnt-subtree/multi1"
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setup_host_bind_mount "source-multi2/" "mnt-subtree/multi2"
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update_config '.mounts += [
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{
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"source": "mnt-subtree/",
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"destination": "/tmp/mount-tree",
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"options": ["rbind", "idmap"],
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"uidMappings": [
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{"containerID": 100, "hostID": 101000, "size": 3},
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{"containerID": 200, "hostID": 102000, "size": 3},
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{"containerID": 300, "hostID": 103000, "size": 3}
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],
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"gidMappings": [
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{"containerID": 210, "hostID": 101100, "size": 10},
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{"containerID": 220, "hostID": 102200, "size": 10},
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{"containerID": 230, "hostID": 103300, "size": 10}
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]
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}
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]'
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update_config '.process.args = ["bash", "-c", "stat -c =%n:%u=%g= /tmp/mount-tree{,/multi1,/multi2}/{foo,bar,baz}.txt"]'
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runc run test_debian
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[ "$status" -eq 0 ]
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[[ "$output" == *"=/tmp/mount-tree/foo.txt:1000=1101="* ]]
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[[ "$output" == *"=/tmp/mount-tree/bar.txt:2000=2202="* ]]
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[[ "$output" == *"=/tmp/mount-tree/baz.txt:3000=3303="* ]]
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# Because we used "idmap", the child mounts were not remapped recursively.
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[[ "$output" == *"=/tmp/mount-tree/multi1/foo.txt:$OVERFLOW_UID=$OVERFLOW_GID="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi1/bar.txt:$OVERFLOW_UID=$OVERFLOW_GID="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi1/baz.txt:$OVERFLOW_UID=$OVERFLOW_GID="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi2/foo.txt:$OVERFLOW_UID=$OVERFLOW_GID="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi2/bar.txt:$OVERFLOW_UID=$OVERFLOW_GID="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi2/baz.txt:$OVERFLOW_UID=$OVERFLOW_GID="* ]]
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}
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@test "idmap mount (idmap flag) [no userns]" {
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setup_host_bind_mount "source-multi1/" "mnt-subtree/multi1"
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setup_host_bind_mount "source-multi2/" "mnt-subtree/multi2"
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update_config '.mounts += [
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{
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"source": "mnt-subtree/",
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"destination": "/tmp/mount-tree",
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"options": ["rbind", "idmap"],
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"uidMappings": [
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{"containerID": 100, "hostID": 101000, "size": 3},
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{"containerID": 200, "hostID": 102000, "size": 3},
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{"containerID": 300, "hostID": 103000, "size": 3}
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],
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"gidMappings": [
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{"containerID": 210, "hostID": 101100, "size": 10},
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{"containerID": 220, "hostID": 102200, "size": 10},
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{"containerID": 230, "hostID": 103300, "size": 10}
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]
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}
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]'
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update_config '.process.args = ["bash", "-c", "stat -c =%n:%u=%g= /tmp/mount-tree{,/multi1,/multi2}/{foo,bar,baz}.txt"]'
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runc run test_debian
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[ "$status" -eq 0 ]
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[[ "$output" == *"=/tmp/mount-tree/foo.txt:101000=101101="* ]]
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[[ "$output" == *"=/tmp/mount-tree/bar.txt:102000=102202="* ]]
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[[ "$output" == *"=/tmp/mount-tree/baz.txt:103000=103303="* ]]
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# Because we used "idmap", the child mounts were not remapped recursively.
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[[ "$output" == *"=/tmp/mount-tree/multi1/foo.txt:100=211="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi1/bar.txt:101=222="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi1/baz.txt:102=233="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi2/foo.txt:200=211="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi2/bar.txt:201=222="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi2/baz.txt:202=233="* ]]
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}
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@test "idmap mount (ridmap flag) [userns]" {
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setup_idmap_userns
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setup_host_bind_mount "source-multi1/" "mnt-subtree/multi1"
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setup_host_bind_mount "source-multi2/" "mnt-subtree/multi2"
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update_config '.mounts += [
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{
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"source": "mnt-subtree/",
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"destination": "/tmp/mount-tree",
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"options": ["rbind", "ridmap"],
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"uidMappings": [
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{"containerID": 100, "hostID": 101000, "size": 3},
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{"containerID": 200, "hostID": 102000, "size": 3},
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{"containerID": 300, "hostID": 103000, "size": 3}
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],
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"gidMappings": [
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{"containerID": 210, "hostID": 101100, "size": 10},
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{"containerID": 220, "hostID": 102200, "size": 10},
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{"containerID": 230, "hostID": 103300, "size": 10}
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]
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}
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]'
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update_config '.process.args = ["bash", "-c", "stat -c =%n:%u=%g= /tmp/mount-tree{,/multi1,/multi2}/{foo,bar,baz}.txt"]'
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runc run test_debian
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[ "$status" -eq 0 ]
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[[ "$output" == *"=/tmp/mount-tree/foo.txt:1000=1101="* ]]
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[[ "$output" == *"=/tmp/mount-tree/bar.txt:2000=2202="* ]]
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[[ "$output" == *"=/tmp/mount-tree/baz.txt:3000=3303="* ]]
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# The child mounts have the same mapping applied.
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[[ "$output" == *"=/tmp/mount-tree/multi1/foo.txt:1000=1101="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi1/bar.txt:1001=2202="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi1/baz.txt:1002=3303="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi2/foo.txt:2000=1101="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi2/bar.txt:2001=2202="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi2/baz.txt:2002=3303="* ]]
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}
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@test "idmap mount (ridmap flag) [no userns]" {
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setup_host_bind_mount "source-multi1/" "mnt-subtree/multi1"
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setup_host_bind_mount "source-multi2/" "mnt-subtree/multi2"
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update_config '.mounts += [
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{
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"source": "mnt-subtree/",
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"destination": "/tmp/mount-tree",
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"options": ["rbind", "ridmap"],
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"uidMappings": [
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{"containerID": 100, "hostID": 101000, "size": 3},
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{"containerID": 200, "hostID": 102000, "size": 3},
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{"containerID": 300, "hostID": 103000, "size": 3}
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],
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"gidMappings": [
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{"containerID": 210, "hostID": 101100, "size": 10},
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{"containerID": 220, "hostID": 102200, "size": 10},
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{"containerID": 230, "hostID": 103300, "size": 10}
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]
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}
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]'
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update_config '.process.args = ["bash", "-c", "stat -c =%n:%u=%g= /tmp/mount-tree{,/multi1,/multi2}/{foo,bar,baz}.txt"]'
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runc run test_debian
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[ "$status" -eq 0 ]
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[[ "$output" == *"=/tmp/mount-tree/foo.txt:101000=101101="* ]]
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[[ "$output" == *"=/tmp/mount-tree/bar.txt:102000=102202="* ]]
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[[ "$output" == *"=/tmp/mount-tree/baz.txt:103000=103303="* ]]
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# The child mounts have the same mapping applied.
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[[ "$output" == *"=/tmp/mount-tree/multi1/foo.txt:101000=101101="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi1/bar.txt:101001=102202="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi1/baz.txt:101002=103303="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi2/foo.txt:102000=101101="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi2/bar.txt:102001=102202="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi2/baz.txt:102002=103303="* ]]
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}
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@test "idmap mount (idmap flag, implied mapping) [userns]" {
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setup_idmap_userns
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setup_host_bind_mount "source-multi1/" "mnt-subtree/multi1"
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setup_host_bind_mount "source-multi2/" "mnt-subtree/multi2"
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update_config '.mounts += [
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{
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"source": "mnt-subtree/",
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"destination": "/tmp/mount-tree",
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"options": ["rbind", "idmap"],
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}
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]'
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update_config '.process.args = ["bash", "-c", "stat -c =%n:%u=%g= /tmp/mount-tree{,/multi1,/multi2}/{foo,bar,baz}.txt"]'
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runc run test_debian
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[ "$status" -eq 0 ]
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[[ "$output" == *"=/tmp/mount-tree/foo.txt:100=211="* ]]
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[[ "$output" == *"=/tmp/mount-tree/bar.txt:200=222="* ]]
|
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[[ "$output" == *"=/tmp/mount-tree/baz.txt:300=233="* ]]
|
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# Because we used "idmap", the child mounts were not remapped recursively.
|
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[[ "$output" == *"=/tmp/mount-tree/multi1/foo.txt:$OVERFLOW_UID=$OVERFLOW_GID="* ]]
|
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[[ "$output" == *"=/tmp/mount-tree/multi1/bar.txt:$OVERFLOW_UID=$OVERFLOW_GID="* ]]
|
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[[ "$output" == *"=/tmp/mount-tree/multi1/baz.txt:$OVERFLOW_UID=$OVERFLOW_GID="* ]]
|
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[[ "$output" == *"=/tmp/mount-tree/multi2/foo.txt:$OVERFLOW_UID=$OVERFLOW_GID="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi2/bar.txt:$OVERFLOW_UID=$OVERFLOW_GID="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi2/baz.txt:$OVERFLOW_UID=$OVERFLOW_GID="* ]]
|
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}
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@test "idmap mount (ridmap flag, implied mapping) [userns]" {
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setup_idmap_userns
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setup_host_bind_mount "source-multi1/" "mnt-subtree/multi1"
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setup_host_bind_mount "source-multi2/" "mnt-subtree/multi2"
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update_config '.mounts += [
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{
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"source": "mnt-subtree/",
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"destination": "/tmp/mount-tree",
|
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"options": ["rbind", "ridmap"],
|
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}
|
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]'
|
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update_config '.process.args = ["bash", "-c", "stat -c =%n:%u=%g= /tmp/mount-tree{,/multi1,/multi2}/{foo,bar,baz}.txt"]'
|
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runc run test_debian
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[ "$status" -eq 0 ]
|
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[[ "$output" == *"=/tmp/mount-tree/foo.txt:100=211="* ]]
|
||||
[[ "$output" == *"=/tmp/mount-tree/bar.txt:200=222="* ]]
|
||||
[[ "$output" == *"=/tmp/mount-tree/baz.txt:300=233="* ]]
|
||||
# The child mounts have the same mapping applied.
|
||||
[[ "$output" == *"=/tmp/mount-tree/multi1/foo.txt:100=211="* ]]
|
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[[ "$output" == *"=/tmp/mount-tree/multi1/bar.txt:101=222="* ]]
|
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[[ "$output" == *"=/tmp/mount-tree/multi1/baz.txt:102=233="* ]]
|
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[[ "$output" == *"=/tmp/mount-tree/multi2/foo.txt:200=211="* ]]
|
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[[ "$output" == *"=/tmp/mount-tree/multi2/bar.txt:201=222="* ]]
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[[ "$output" == *"=/tmp/mount-tree/multi2/baz.txt:202=233="* ]]
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}
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@test "idmap mount (idmap flag, implied mapping, userns join) [userns]" {
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# Create a detached container with the id-mapping we want.
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cp config.json config.json.bak
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update_config '.linux.namespaces += [{"type": "user"}]
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| .linux.uidMappings += [{"containerID": 0, "hostID": 100000, "size": 65536}]
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| .linux.gidMappings += [{"containerID": 0, "hostID": 100000, "size": 65536}]'
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update_config '.process.args = ["sleep", "infinity"]'
|
||||
|
||||
runc run -d --console-socket "$CONSOLE_SOCKET" target_userns
|
||||
[ "$status" -eq 0 ]
|
||||
|
||||
# Configure our container to attach to the first container's userns.
|
||||
target_pid="$(__runc state target_userns | jq .pid)"
|
||||
update_config '.linux.namespaces |= map(if .type == "user" then (.path = "/proc/'"$target_pid"'/ns/" + .type) else . end)'
|
||||
update_config 'del(.linux.uidMappings) | del(.linux.gidMappings)'
|
||||
|
||||
setup_host_bind_mount "source-multi1/" "mnt-subtree/multi1"
|
||||
setup_host_bind_mount "source-multi2/" "mnt-subtree/multi2"
|
||||
|
||||
update_config '.mounts += [
|
||||
{
|
||||
"source": "mnt-subtree/",
|
||||
"destination": "/tmp/mount-tree",
|
||||
"options": ["rbind", "idmap"],
|
||||
}
|
||||
]'
|
||||
|
||||
update_config '.process.args = ["bash", "-c", "stat -c =%n:%u=%g= /tmp/mount-tree{,/multi1,/multi2}/{foo,bar,baz}.txt"]'
|
||||
runc run test_debian
|
||||
[ "$status" -eq 0 ]
|
||||
[[ "$output" == *"=/tmp/mount-tree/foo.txt:100=211="* ]]
|
||||
[[ "$output" == *"=/tmp/mount-tree/bar.txt:200=222="* ]]
|
||||
[[ "$output" == *"=/tmp/mount-tree/baz.txt:300=233="* ]]
|
||||
# Because we used "idmap", the child mounts were not remapped recursively.
|
||||
[[ "$output" == *"=/tmp/mount-tree/multi1/foo.txt:$OVERFLOW_UID=$OVERFLOW_GID="* ]]
|
||||
[[ "$output" == *"=/tmp/mount-tree/multi1/bar.txt:$OVERFLOW_UID=$OVERFLOW_GID="* ]]
|
||||
[[ "$output" == *"=/tmp/mount-tree/multi1/baz.txt:$OVERFLOW_UID=$OVERFLOW_GID="* ]]
|
||||
[[ "$output" == *"=/tmp/mount-tree/multi2/foo.txt:$OVERFLOW_UID=$OVERFLOW_GID="* ]]
|
||||
[[ "$output" == *"=/tmp/mount-tree/multi2/bar.txt:$OVERFLOW_UID=$OVERFLOW_GID="* ]]
|
||||
[[ "$output" == *"=/tmp/mount-tree/multi2/baz.txt:$OVERFLOW_UID=$OVERFLOW_GID="* ]]
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user