6.22. Acl-2.2.52

#### Linux From Scratch - Version 7.10-rc1

### Chapter 6. Installing Basic System Software

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# 6.22. Acl-2.2.52

The Acl package contains utilities to administer Access Control Lists, which are used to define more fine-grained discretionary access rights for files and directories.

Approximate build time: less than 0.1 SBU
Required disk space: 5.0 MB

## 6.22.1. Installation of Acl

Modify the documentation directory so that it is a versioned directory:

    sed -i -e 's|/@pkg_name@|&-@pkg_version@|' include/builddefs.in

Fix some broken tests:

    sed -i "s:| sed.*::g" test/{sbits-restore,cp,misc}.test

Additionally, fix a bug that causes getfacl -e to segfault on overly long group name:

    sed -i -e "/TABS-1;/a if (x > (TABS-1)) x = (TABS-1);" \
        libacl/__acl_to_any_text.c

Prepare Acl for compilation:

    ./configure --prefix=/usr    \
                --bindir=/bin    \
                --disable-static \
                --libexecdir=/usr/lib

Compile the package:

    make

The Acl tests need to be run on a filesystem that supports access controls after Coreutils has been built with the Acl libraries. If desired, return to this package and run make -j1 tests after Coreutils has been built later in this chapter.

Install the package:

    make install install-dev install-lib
    chmod -v 755 /usr/lib/libacl.so

The shared library needs to be moved to `/lib`, and as a result the `.so` file in `/usr/lib` will need to be recreated:

    mv -v /usr/lib/libacl.so.* /lib
    ln -sfv ../../lib/$(readlink /usr/lib/libacl.so) /usr/lib/libacl.so

## 6.22.2. Contents of Acl

Installed programs: chacl, getfacl, and setacl
Installed library: libacl.so
Installed directories: /usr/include/acl and /usr/share/doc/acl-2.2.52

### Short Descriptions

chacl | Changes the access control list of a file or directory
getfacl | Gets file access control lists
setacl | Sets file access control lists
`libacl` | Contains the library functions for manipulating Access Control Lists

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