62 lines
2.2 KiB
Bash
62 lines
2.2 KiB
Bash
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#!/usr/bin/env bash
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set -Eeuo pipefail
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[[ $# -eq 2 ]] || { echo "Usage: $0 ROOTFS.ext4 TREE" >&2; exit 2; }
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ROOTFS=$1
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TREE=$2
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[[ -f "$ROOTFS" && -d "$TREE" ]] || { echo "Invalid rootfs or tree" >&2; exit 2; }
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COMMANDS=$(mktemp)
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trap 'rm -f -- "$COMMANDS"' EXIT
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escape_debugfs() {
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local value=$1
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value=${value//\\/\\\\}
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value=${value//\"/\\\"}
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printf '%s' "$value"
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}
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while IFS= read -r -d '' source_path; do
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relative_path=${source_path#"$TREE"/}
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target_path="/${relative_path}"
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quoted_target=$(escape_debugfs "$target_path")
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if [[ -d "$source_path" && ! -L "$source_path" ]]; then
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printf 'mkdir "%s"\n' "$quoted_target" >>"$COMMANDS"
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fi
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done < <(find "$TREE" -mindepth 1 -type d -print0 | sort -z)
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while IFS= read -r -d '' source_path; do
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relative_path=${source_path#"$TREE"/}
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target_path="/${relative_path}"
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quoted_source=$(escape_debugfs "$source_path")
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quoted_target=$(escape_debugfs "$target_path")
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if [[ -L "$source_path" ]]; then
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printf 'rm "%s"\n' "$quoted_target" >>"$COMMANDS"
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printf 'symlink "%s" "%s"\n' "$quoted_target" "$(escape_debugfs "$(readlink "$source_path")")" >>"$COMMANDS"
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elif [[ -f "$source_path" ]]; then
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printf 'rm "%s"\n' "$quoted_target" >>"$COMMANDS"
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printf 'write "%s" "%s"\n' "$quoted_source" "$quoted_target" >>"$COMMANDS"
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fi
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done < <(find "$TREE" -mindepth 1 \( -type f -o -type l \) -print0 | sort -z)
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while IFS= read -r -d '' source_path; do
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relative_path=${source_path#"$TREE"/}
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target_path="/${relative_path}"
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quoted_target=$(escape_debugfs "$target_path")
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permissions=$(stat -c '%a' "$source_path")
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if [[ -d "$source_path" && ! -L "$source_path" ]]; then
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file_type=040000
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elif [[ -L "$source_path" ]]; then
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file_type=0120000
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else
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file_type=0100000
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fi
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printf 'set_inode_field "%s" uid 0\n' "$quoted_target" >>"$COMMANDS"
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printf 'set_inode_field "%s" gid 0\n' "$quoted_target" >>"$COMMANDS"
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printf 'set_inode_field "%s" mode 0%o\n' "$quoted_target" "$((file_type | 8#$permissions))" >>"$COMMANDS"
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done < <(find "$TREE" -mindepth 1 -print0 | sort -z)
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# debugfs reports benign "already exists" and "file not found" diagnostics for
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# idempotent mkdir/rm operations. The caller performs explicit postconditions.
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debugfs -w -f "$COMMANDS" "$ROOTFS" >/dev/null 2>&1
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