Check file system access rights

Check file system access rights

checkAccess(x, access = "")

check_access(x, access = "")

assertAccess(x, access = "", .var.name = vname(x), add = NULL)

assert_access(x, access = "", .var.name = vname(x), add = NULL)

testAccess(x, access = "")

test_access(x, access = "")

expect_access(x, access = "", info = NULL, label = vname(x))

Arguments

x

[any]
Object to check.

access

[character(1)]
Single string containing possible characters ‘r’, ‘w’ and ‘x’ to force a check for read, write or execute access rights, respectively. Write and executable rights are not checked on Windows.

.var.name

[character(1)]
Name of the checked object to print in assertions. Defaults to the heuristic implemented in vname.

add

[AssertCollection]
Collection to store assertion messages. See AssertCollection.

info

[character(1)]
Extra information to be included in the message for the testthat reporter. See expect_that.

label

[character(1)]
Name of the checked object to print in messages. Defaults to the heuristic implemented in vname.

Value

Depending on the function prefix: If the check is successful, the functions

assertAccess/assert_access return

x invisibly, whereas

checkAccess/check_access and

testAccess/test_access return

TRUE. If the check is not successful,

assertAccess/assert_access

throws an error message,

testAccess/test_access

returns FALSE, and checkAccess/check_access

return a string with the error message. The function expect_access always returns an

expectation.

See also

Other filesystem: checkDirectoryExists(), checkFileExists(), checkPathForOutput()

Examples

# Is R's home directory readable?
testAccess(R.home(), "r")
#> [1] TRUE

# Is R's home directory writeable?
testAccess(R.home(), "w")
#> [1] FALSE