1#!/bin/sh
2#
3# Check if a given custom skeleton or overlay complies to the merged /usr
4# requirements:
5# /
6# /bin -> usr/bin
7# /lib -> usr/lib
8# /sbin -> usr/sbin
9# /usr/bin/
10# /usr/lib/
11# /usr/sbin/
12#
13# Output: the list of non-compliant paths (empty if compliant).
14#
15
16# Extract the inode numbers for all of those directories. In case any is
17# a symlink, we want to get the inode of the pointed-to directory, so we
18# append '/.' to be sure we get the target directory. Since the symlinks
19# can be anyway (/bin -> /usr/bin or /usr/bin -> /bin), we do that for
20# all of them.
21#
22lib_inode=$(stat -c '%i' "${1}/lib/." 2>/dev/null)
23bin_inode=$(stat -c '%i' "${1}/bin/." 2>/dev/null)
24sbin_inode=$(stat -c '%i' "${1}/sbin/." 2>/dev/null)
25usr_lib_inode=$(stat -c '%i' "${1}/usr/lib/." 2>/dev/null)
26usr_bin_inode=$(stat -c '%i' "${1}/usr/bin/." 2>/dev/null)
27usr_sbin_inode=$(stat -c '%i' "${1}/usr/sbin/." 2>/dev/null)
28
29not_merged_dirs=""
30test -z "$lib_inode" || \
31	test "$lib_inode" = "$usr_lib_inode" || \
32		not_merged_dirs="/lib"
33test -z "$bin_inode" || \
34	test "$bin_inode" = "$usr_bin_inode" || \
35		not_merged_dirs="$not_merged_dirs /bin"
36test -z "$sbin_inode" || \
37	test "$sbin_inode" = "$usr_sbin_inode" || \
38		not_merged_dirs="$not_merged_dirs /sbin"
39echo "${not_merged_dirs# }"
40