在appimage中使用unionfs

Question

我正在从AppImage中的脚本创建一个覆盖FS (使用unionfs-fuse) (使用appImage-Builderv0.9.2创建)。

覆盖被成功地挂载，但是在脚本的末尾，它无法正确地用'Operation not permitted‘卸载。

不过，在AppImage结束后，fusermount -u可以正常工作。

这是脚本script.sh

#!/bin/sh

ROOT_DIR=$(mktemp -d -t test-XXXXXX)
myUID=$(id -u)
myGID=$(id -g)
USER_DIR=/tmp/a
mkdir -p ${USER_DIR}

echo "Hello world!" > ${USER_DIR}/hello.txt

# create an overlay of $USER_DIR (rw) over $APPDIR (ro) into $ROOT_DIR
UNIONFS="unionfs -o cow,uid=${myUID},gid=${myGID} ${USER_DIR}=RW:${APPDIR} ${ROOT_DIR}"
if ! $( ${UNIONFS} ); then
    echo "mount failed!"
    exit 1
fi
echo "overlay created in ${ROOT_DIR}"

# files in $USER_DIR may be read/written from the overlay
cat ${ROOT_DIR}/hello.txt

# unmount overlay before closing the AppImage
fusermount -zu ${ROOT_DIR}
rmdir ${ROOT_DIR}

这是AppImage食谱AppImageBuilder.yml

version: 1

AppDir:
  path: /home/user/bugreport

  app_info:
    id: org.appimage.test
    name: AppimageTest
    icon: terminal
    version: 0.0.1
    exec: bin/dash
    exec_args: "script.sh"

  apt:
    arch: amd64
    sources:
      - sourceline: 'deb [arch=amd64] http://archive.ubuntu.com/ubuntu/ bionic main restricted universe multiverse'
        key_url: 'http://keyserver.ubuntu.com/pks/lookup?op=get&search=0x3b4fe6acc0b21f32'
      - sourceline: 'deb [arch=amd64] http://archive.ubuntu.com/ubuntu/ bionic-updates main restricted universe multiverse'
      - sourceline: 'deb [arch=amd64] http://archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse'

    include: [unionfs-fuse, dash, coreutils]
    exclude: []

AppImage:
  arch: x86_64
  update-information: None
  sign-key: None

(在terminal.png中还需要一个随机图标文件来构建AppImage)。

AppImage是使用以下方法构建的：

$ appimage-builder --recipe ./AppImageBuilder.yml

任何帮助都将不胜感激！

Answer 1

解决办法是：

使用选项auto_unmount

• instead of fusermount -u启动unionfs，用pkill -nf ${ROOT_DIR}终止最后一个unionfs进程。

(杀死最近在其参数中包含${ROOT_DIR}的进程)

生成的脚本：

#!/bin/sh

ROOT_DIR=$(mktemp -d -t test-XXXXXX)
myUID=$(id -u)
myGID=$(id -g)
USER_DIR=/tmp/a
mkdir -p ${USER_DIR}

echo "Hello world!" > ${USER_DIR}/hello.txt

# create an overlay of $USER_DIR (rw) over $APPDIR (ro) into $ROOT_DIR
UNIONFS="unionfs -o cow,auto_unmount,uid=${myUID},gid=${myGID} ${USER_DIR}=RW:${APPDIR} ${ROOT_DIR}"
if ! $( ${UNIONFS} ); then
    echo "mount failed!"
    exit 1
fi
echo "overlay created in ${ROOT_DIR}"

# files in $USER_DIR may be read/written from the overlay
cat ${ROOT_DIR}/hello.txt

# killing unionfs will unmount the overlay
pkill -nf ${ROOT_DIR}
sleep 0.1
rmdir ${ROOT_DIR}