summaryrefslogtreecommitdiffstats
path: root/admin/detect-autoconf.pl
blob: 7166bceb3a603415520b6fb8a0385b653a486f08 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
#!/usr/bin/env perl

# Try to locate best version of auto*
# By Michael Pyne <michael.pyne@kdemail.net>
#
# Copyright (c) 2005.
# This code is public domain.  You may use it however you like (including
# relicensing).

# Emulate the 'which' program.
sub which
{
    my $prog = shift;
    my @paths = split(/:/, $ENV{'PATH'});

    for $path (@paths)
    {
	return "$path/$prog" if -x "$path/$prog";
    }

    return "";
}

# Subroutine to determine the highest installed version of the given program,
# searching from the given paths.
sub findBest
{
    my ($program, @paths) = @_;
    my $best_version_found = '0'; # Deliberately a string.
    my %versions;
    my %minimumVersions = (
 	'autoconf' => '2.5',
	'automake' => '1.6',
    );

    # Allow user to use environment variable to override search.
    return $ENV{uc $program} if $ENV{uc $program};

    for $prefix (@paths)
    {
	@files = glob "$prefix/$program*";
	for $file (@files)
	{
	    # Don't check non-executable scripts.
	    next unless -x $file;

	    ($version) = $file =~ /$prefix\/$program-?(.*)$/;
	    $version =~ s/-|\.//g;

	    # Special case some programs to make sure it has a minimum version.
	    if (not $version and exists $minimumVersions{$program})
	    {
		my $min_version = $minimumVersions{$program};
		my $versionOutput = `$program --version 2>/dev/null | head -n 1`;

		# If we can't run the script to get the version it likely won't work later.
		next unless $versionOutput; 

		# Use number.number for version (we don't need the excess in general).
		($versionOutput) = ($versionOutput =~ /(\d\.\d)/);

		# Use lt to do lexicographical comparison of strings (which should be
		# equivalent and doesn't involve issues with floating point conversions).
		if (not $versionOutput or $versionOutput lt $min_version)
		{
		    next;
		}
	    }

	    # If no version suffix then use it in favor of a versioned autotool
	    # since the ever-popular WANT_AUTOFOO should then work (in theory).
	    return $file unless $version;

	    # Emulate 'which', and abort if we've already seen this version.
	    next if exists $versions{$version};

	    # Save filename of program.
	    $versions{$version} = $file;

	    # Use string comparison so that e.g. 253a will be > 253 but < 254.
	    if ($version gt $best_version_found)
	    {
		$best_version_found = $version;
	    }
	}
    }

    return $versions{$best_version_found};
}

# Find an appropriate "which" program for later use by the shell script calling
# us.
sub findWhich
{
    for $candidate ('type -p', 'which', 'type')
    {
	$test = `$candidate sh 2>/dev/null`;
	chomp $test;

	return $candidate if -x $test;
    }
}

# Uses which() to find a program unless the user provided its path in the
# environment (the upper case program name is searched).
sub findProgram
{
    $suffix = ""; # For use if @_ has only one param.
    my ($program, $suffix) = @_;

    return $ENV{uc $program} if $ENV{uc $program};
    return which("$program$suffix");
}

# SCRIPT STARTS.

# Search in path.
@paths = split(/:/, $ENV{'PATH'});

# Make sure at least /usr/bin and /usr/local/bin are in this search.
unshift @paths, '/usr/local/bin' unless grep $_ eq '/usr/local/bin', @paths;
unshift @paths, '/usr/bin' unless grep $_ eq '/usr/bin', @paths;

$autoconf = findBest('autoconf', @paths);
($autoconf_suffix) = $autoconf =~ /.*autoconf(.*)$/;

# Find matching autoconf companions.
$autoheader = findProgram('autoheader', $autoconf_suffix);
$autom4te = findProgram('autom4te', $autoconf_suffix);

# Get best automake, and look for unsermake to possibly override it.
$automake = findBest('automake', @paths);
$unsermake = "";
# backward compatible: if $UNSERMAKE points to a path, use it
$unsermake = findProgram('unsermake') if (defined($ENV{'UNSERMAKE'}) and $ENV{'UNSERMAKE'} =~ /\//);
# new compatible: if it says 'yes', use the one from path
$unsermake = which('unsermake') if ($ENV{'UNSERMAKE'} ne 'no');

($automake_suffix) = $automake =~ /.*automake(.*)$/;

# Use unsermake if we found it.
$automake = "$unsermake -c" if $unsermake;

# Find matching automake companions.
$aclocal = findProgram('aclocal', $automake_suffix);

$which = findWhich();

# Make sure we have all of the needed programs.
for $i (qw'autoconf autoheader autom4te automake aclocal')
{
    unless(${$i})
    {
	print "# Unable to find $i!!\n";
	exit 1;
    }
}

# Print results in eval-able form.
print <<EOF;
AUTOCONF="$autoconf"
AUTOHEADER="$autoheader"
AUTOM4TE="$autom4te"

AUTOMAKE="$automake"
ACLOCAL="$aclocal"

WHICH="$which"

export AUTOCONF AUTOHEADER AUTOM4TE AUTOMAKE ACLOCAL WHICH
EOF

exit 0;