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Merge pull request #138742 from etu/zfs-syncoid-parent-permission-delegation

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nixos/syncoid: Delegate permissions to parent dataset if target is missing
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Elis Hirwing 2021-09-27 19:55:32 +02:00 committed by GitHub
commit fb55c86904
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1 changed files with 65 additions and 14 deletions
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71
nixos/modules/services/backup/syncoid.nix
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@ -16,16 +16,67 @@ let
lib.concatMapStrings (s: if lib.isList s then "-" else s)
(builtins.split "[^a-zA-Z0-9_.\\-]+" name);
# Function to build "zfs allow" and "zfs unallow" commands for the
# filesystems we've delegated permissions to.
buildAllowCommand = zfsAction: permissions: dataset: lib.escapeShellArgs [
# Function to build "zfs allow" commands for the filesystems we've
# delegated permissions to. It also checks if the target dataset
# exists before delegating permissions, if it doesn't exist we
# delegate it to the parent dataset. This should solve the case of
# provisoning new datasets.
buildAllowCommand = permissions: dataset: (
"-+${pkgs.writeShellScript "zfs-allow-${dataset}" ''
# Here we explicitly use the booted system to guarantee the stable API needed by ZFS
"-+/run/booted-system/sw/bin/zfs"
zfsAction
# Run a ZFS list on the dataset to check if it exists
if ${lib.escapeShellArgs [
"/run/booted-system/sw/bin/zfs"
"list"
dataset
]} 2> /dev/null; then
${lib.escapeShellArgs [
"/run/booted-system/sw/bin/zfs"
"allow"
cfg.user
(concatStringsSep "," permissions)
dataset
];
]}
else
${lib.escapeShellArgs [
"/run/booted-system/sw/bin/zfs"
"allow"
cfg.user
(concatStringsSep "," permissions)
# Remove the last part of the path
(builtins.dirOf dataset)
]}
fi
''}"
);
# Function to build "zfs unallow" commands for the filesystems we've
# delegated permissions to. Here we unallow both the target but also
# on the parent dataset because at this stage we have no way of
# knowing if the allow command did execute on the parent dataset or
# not in the pre-hook. We can't run the same if in the post hook
# since the dataset should have been created at this point.
buildUnallowCommand = permissions: dataset: (
"-+${pkgs.writeShellScript "zfs-unallow-${dataset}" ''
# Here we explicitly use the booted system to guarantee the stable API needed by ZFS
${lib.escapeShellArgs [
"/run/booted-system/sw/bin/zfs"
"unallow"
cfg.user
(concatStringsSep "," permissions)
dataset
]}
${lib.escapeShellArgs [
"/run/booted-system/sw/bin/zfs"
"unallow"
cfg.user
(concatStringsSep "," permissions)
# Remove the last part of the path
(builtins.dirOf dataset)
]}
''}"
);
in
{
@ -274,11 +325,11 @@ in
path = [ "/run/booted-system/sw/bin/" ];
serviceConfig = {
ExecStartPre =
(map (buildAllowCommand "allow" c.localSourceAllow) (localDatasetName c.source)) ++
(map (buildAllowCommand "allow" c.localTargetAllow) (localDatasetName c.target));
(map (buildAllowCommand c.localSourceAllow) (localDatasetName c.source)) ++
(map (buildAllowCommand c.localTargetAllow) (localDatasetName c.target));
ExecStopPost =
(map (buildAllowCommand "unallow" c.localSourceAllow) (localDatasetName c.source)) ++
(map (buildAllowCommand "unallow" c.localTargetAllow) (localDatasetName c.target));
(map (buildUnallowCommand c.localSourceAllow) (localDatasetName c.source)) ++
(map (buildUnallowCommand c.localTargetAllow) (localDatasetName c.target));
ExecStart = lib.escapeShellArgs ([ "${pkgs.sanoid}/bin/syncoid" ]
++ optionals c.useCommonArgs cfg.commonArgs
++ optional c.recursive "-r"