226ebe1717
The user-namespace prefix that lets an unprivileged restore put back a file's original owner was only wired into restic. borg extract and kopia snapshot restore run as the same backup user with the same lack of CAP_CHOWN, so both lost <container-uid>:<backup-user> exactly the way restic did — an app whose data comes back owned by the backup user cannot write it, which is how grafana kept dying with "attempt to write a readonly database". borg is quieter about it than restic: it does not print an "ignoring error" line at all, so there was nothing to notice. Move the prefix to engine_dispatch.sh as backupUsernsPrefix — it was never restic-specific — and use it from all three engines. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
57 lines
1.8 KiB
Bash
57 lines
1.8 KiB
Bash
#!/bin/bash
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kopiaRestoreSnapshot()
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{
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local idx="$1"
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local snapshot_id="$2"
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local target_dir="$3"
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local include_path="$4" # ignored — kopia restores by snapshot id directly
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if [[ -z "$snapshot_id" || -z "$target_dir" ]]; then
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isError "kopiaRestoreSnapshot requires snapshot_id and target_dir"
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return 1
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fi
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kopiaEnvExport "$idx" || return 1
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runFileOp mkdir -p "$target_dir"
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isNotice "Restoring ${snapshot_id:0:12} from $(resticLocationName "$idx") → $target_dir"
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# Kopia's restore lays down the snapshot's source tree relative to target.
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# If include_path was given (we always pass /docker/containers/<app>), we
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# nest into that subpath under target so it matches restic's behaviour.
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local final_target="$target_dir"
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if [[ -n "$include_path" ]]; then
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final_target="$target_dir/${include_path#/}"
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runFileOp mkdir -p "$final_target"
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fi
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# Restore runs as the backup user with no CAP_CHOWN; without the namespace
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# every <container-uid>:<backup-user> file comes back owned by the backup
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# user and the app cannot write its own data. See restic-userns-exec.
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local ns_prefix=()
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mapfile -t ns_prefix < <(backupUsernsPrefix)
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runBackupOp "${ns_prefix[@]}" kopia snapshot restore "$snapshot_id" "$final_target"
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local rc=$?
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kopiaEnvUnset
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return $rc
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}
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kopiaDumpFile()
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{
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local idx="$1"
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local snapshot_id="$2"
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local file_path="$3"
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local target_file="$4"
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kopiaEnvExport "$idx" || return 1
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# `kopia show` writes the file contents from a snapshot to stdout.
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if [[ -n "$target_file" ]]; then
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runBackupOp kopia show "${snapshot_id}:${file_path}" | runBackupOp tee "$target_file" >/dev/null
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else
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runBackupOp kopia show "${snapshot_id}:${file_path}"
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fi
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local rc=$?
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kopiaEnvUnset
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return $rc
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}
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