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static: add generator for hybrid-users mounts #386

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static: add generator for hybrid-users mounts #386

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44 changes: 44 additions & 0 deletions static/usr/lib/systemd/system-generators/hybrid-users
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Original file line number Diff line number Diff line change
@@ -0,0 +1,44 @@
#!/bin/sh

set -eu

if ! [ -d /run/snapd/hybrid-users ]; then
exit 0
fi

normal="${1}"

sysroot=
sysroot_unit=
target="local-fs.target"
if [ -e /etc/initrd-released ]; then
sysroot=/sysroot
sysroot_unit=sysroot-
target=initrd-fs.target
fi

gen_mount() {
unit="${1}"
file="${2}"
cat <<EOF >"${normal}/${unit}"
[Unit]
ConditionPathExists=!${sysroot}/etc/system-image/writable-paths
DefaultDependencies=no
Before=${target}
Before=umount.target
Conflicts=umount.target

[Mount]
What=${sysroot}/etc/${file}
Where=/run/snapd/hybrid-users/${file}
Type=none
Options=bind
EOF
mkdir -p "${normal}/${target}.d"
ln -s "../${unit}" "${normal}/${target}.d/${unit}"
}

gen_mount "${sysroot_unit}etc-passwd.mount" passwd
gen_mount "${sysroot_unit}etc-shadow.mount" shadow
gen_mount "${sysroot_unit}etc-group.mount" group
gen_mount "${sysroot_unit}etc-gshadow.mount" gshadow
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