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#
# Works like the built-in type "file", but gets gracefully ignored if the target/source does not exist or is undefined.
#
# Also, if the source or target doesn't exist, and the destination is a git repo, then the file is restored from git.
#
# /bin/true and /usr/bin/test are hardcoded to their paths in debian.
#
# known limitations:
# * restore does not work for directories
#
define try::file (
$ensure = undef,
$target = undef,
$source = undef,
$owner = undef,
$group = undef,
$recurse = undef,
$purge = undef,
$force = undef,
$mode = undef,
$restore = true) {
if $target {
$target_or_source = $target
} else {
$target_or_source = $source
}
if $target_or_source != undef {
exec { "check_${name}":
command => "/bin/true",
onlyif => "/usr/bin/test -e '${target_or_source}'",
loglevel => info;
}
file { "$name":
ensure => $ensure,
target => $target,
source => $source,
owner => $owner,
group => $group,
recurse => $recurse,
purge => $purge,
force => $force,
mode => $mode,
require => $require ? {
undef => Exec["check_${name}"],
default => [ $require, Exec["check_${name}"] ]
},
loglevel => info;
}
}
#
# if the target/source does not exist (or is undef), and the file happens to be in a git repo,
# then restore the file to its original state.
#
if ($target_or_source == undef) or $restore {
$file_basename = basename($name)
$file_dirname = dirname($name)
$command = "git rev-parse && unlink '${name}'; git checkout -- '${file_basename}' && chown --reference='${file_dirname}' '${name}'; true"
debug($command)
if $target == undef {
exec { "restore_${name}":
command => $command,
cwd => $file_dirname,
require => $require ? {
undef => undef,
default => [ $require ]
},
loglevel => info;
}
} else {
exec { "restore_${name}":
unless => "/usr/bin/test -e '${target_or_source}'",
command => $command,
cwd => $file_dirname,
require => $require ? {
undef => undef,
default => [ $require ]
},
loglevel => info;
}
}
}
}
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