How to Check File Permissions With Cmake?

To check file permissions with CMake, you can use the file command followed by the PERMISSIONS option to specify the permissions you want to check for. You can use this command to check if a file has read, write, or execute permissions set for the owner, group, or others. By using the file command in your CMake script, you can easily verify the permission settings of a specific file and take appropriate actions based on the result.

How to check file permissions with different users using cmake?

You can check file permissions with different users using cmake by utilizing the execute_process command along with the stat command in a custom shell command. Here's an example CMake code snippet to achieve this:

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set(FILE_PATH "/path/to/your/file.txt")
set(USER1 "user1")
set(USER2 "user2")

execute_process(
    COMMAND sh -c "stat -c '%A' ${FILE_PATH}"
    OUTPUT_VARIABLE FILE_PERMISSIONS
    OUTPUT_STRIP_TRAILING_WHITESPACE
)

message("File permissions: ${FILE_PERMISSIONS}")

execute_process(
    COMMAND sh -c "sudo -u ${USER1} stat -c '%A' ${FILE_PATH}"
    OUTPUT_VARIABLE FILE_PERMISSIONS_USER1
    OUTPUT_STRIP_TRAILING_WHITESPACE
)

message("File permissions for user1: ${FILE_PERMISSIONS_USER1}")

execute_process(
    COMMAND sh -c "sudo -u ${USER2} stat -c '%A' ${FILE_PATH}"
    OUTPUT_VARIABLE FILE_PERMISSIONS_USER2
    OUTPUT_STRIP_TRAILING_WHITESPACE
)

message("File permissions for user2: ${FILE_PERMISSIONS_USER2}")

In this example, we first get the file permissions for the specified FILE_PATH. Then, we use the sudo -u command to switch the user context to USER1 and USER2 to check the file permissions from their respective perspectives.

You can run this CMake code by including it in your CMakeLists.txt file and generating the build system using cmake. When you run the generated build system, the file permissions for the specified file path will be displayed for the default user and the specified users.

How to check read permissions with cmake?

You can check read permissions using the CMake file command with the EXISTS option. Here is an example of how to do this:

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file(READABLE file_path)
if (file_path)
  message("File is readable")
else()
  message("File is not readable")
endif()

In this code snippet, the file command is used with the READABLE option to check if the specified file_path is readable. If the file is readable, it will print "File is readable", otherwise it will print "File is not readable".

How to check specific file permissions with cmake?

To check specific file permissions with CMake, you can use the FILE command in CMake. Here is an example to check for read, write, and execute permissions of a specific file:

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file(READABLE filePathVar filePath)
file(WRITEABLE filePathVar filePath)
file(READABLE filePathVar filePath)

In the above example, replace filePathVar with the path to the specific file for which you want to check permissions. The READABLE, WRITEABLE, and EXECUTABLE options can be used to check for read, write, and execute permissions respectively.

You can use these commands in your CMake script to check the permissions of a specific file and take appropriate actions based on the results.

How to check file permissions in a specific directory with cmake?

To check file permissions in a specific directory with CMake, you can use the file command in CMake. Here's an example of how to check the file permissions of a specific file in a directory:

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# Specify the path to the file
set(FILE_PATH "path/to/file")

# Check the file permissions
file(READABLE ${FILE_PATH} IS_READABLE)
file(WRITABLE ${FILE_PATH} IS_WRITABLE)
file(EXECUTABLE ${FILE_PATH} IS_EXECUTABLE)

message("File at ${FILE_PATH} is readable: ${IS_READABLE}")
message("File at ${FILE_PATH} is writable: ${IS_WRITABLE}")
message("File at ${FILE_PATH} is executable: ${IS_EXECUTABLE}")

You can also use the file(permissions) command in CMake to retrieve the file permissions as a string. Here's an example:

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# Specify the path to the file
set(FILE_PATH "path/to/file")

# Get the file permissions
file(READABLE ${FILE_PATH} READ_PERM)
file(WRITABLE ${FILE_PATH} WRITE_PERM)
file(EXECUTABLE ${FILE_PATH} EXEC_PERM)

message("File permissions for ${FILE_PATH}: ${READ_PERM}${WRITE_PERM}${EXEC_PERM}")

These examples show how to check the file permissions of a specific file in a directory using CMake. You can modify the code snippets above to check the file permissions of multiple files in a specific directory if needed.

How to check file permissions using wildcards with cmake?

To check file permissions using wildcards with CMake, you can use the "file" command along with the "GLOB" subcommand to search for files matching a certain pattern, and then use the "file" command again with the "TEST" subcommand to check the permissions of each file.

Here's an example CMake code snippet that checks the permissions of all files in a directory that match a certain pattern:

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file(GLOB FILES_TO_CHECK "path/to/directory/*.txt")

foreach(FILE ${FILES_TO_CHECK})
    file(TEST FILE_PERMISSIONS ${FILE} PERMISSIONS OWNER_READ OWNER_WRITE OWNER_EXECUTE)
    if(NOT FILE_PERMISSIONS)
        message(WARNING "File ${FILE} does not have the required permissions.")
    endif()
endforeach()

In this example, we first use the "file(GLOB ...)" command to get a list of all ".txt" files in the "path/to/directory" directory. Then, we iterate over each file in the list and use the "file(TEST ...)" command to check if the file has the required permissions (in this case, owner read, write, and execute permissions).

You can adjust the file pattern and the required permissions to fit your specific use case.