Arch::Backend - Arch backend feature specific functions

    use Arch::Backend qw(arch_backend is_baz has_file_diffs_cmd);

    my $exe = arch_backend();
    print "Not in tree, try '$exe init-tree'\n";

    my $version = Arch::Backend::arch_backend_version;
    print "Using baz $version as a backend\n" if is_baz();

    my $cmd = has_file_diffs_cmd()
        ? "file-diffs"
        : "file-diff";
    Arch::Util::run_tla($cmd, $filename);

A set of helper functions suitable for GNU Arch related projects in Perl.

Higher (object oriented) levels of Arch/Perl library make use of these helper functions to query certain aspects (like incompatible features) of the actual arch backend used.

The following functions are available:

arch_backend, arch_backend_name, arch_backend_version, is_baz, is_tla, has_archive_setup_cmd, has_file_diffs_cmd, has_register_archive_name_arg, has_tree_version_dir_opt, has_tree_id_cmd, has_set_tree_version_cmd, has_cache_feature, get_cache_config.

arch_backend [exe]

Return or set the arch backend executable, like /opt/bin/tla or baz-1.3. By default, the arch backend executable is taken from environment variable CW$ARCH_BACKEND (or CW$TLA, or CW$BAZ). If no environment variable is set, then tla is used.

arch_backend_name

Return the brand name of the arch backend, tla or baz.

arch_backend_version

Return the arch backend version, like 1.3.1.

is_tla

Return true if arch_backend_name is tla.

is_baz

Return true if arch_backend_name is baz.

has_archive_setup_cmd

Return true if the arch backend has archive-setup command. baz removed this command.

has_file_diffs_cmd

Return true if the arch backend has file-diffs command. It was renamed to file-diff in tla-1.3.

has_register_archive_name_arg

Return true if the arch backend's register-archive command supports two positional arguments, one of which is archive name. baz-1.3 removed such syntax; the previous baz versions supported this syntax, but it was useless, since the archive was accessed anyway.

has_tree_version_dir_opt

Return true if the arch backend's tree-version command supports -d options. This is true for baz.

has_tree_id_cmd

Return true if the arch backend has tree-id command. This is true for baz.

has_set_tree_version_cmd

Return true if the arch backend has set-tree-version command. baz removed this command and merged it into tree-version.

has_cache_feature

Return true if the arch backend supports Arch Cache feature. This is true for baz.

get_cache_config

Return hash with the following keys: dir - directory of the local cache (or undef if not applicable).

has_commit_version_arg

Return true if the arch backend's commit command supports version argument. baz-1.4 removed this functionality.

has_commit_files_separator

Return true if the arch backend's commit command requires -- argument to separate files. baz-1.4 removed this separator.

has_revlib_patch_set_dir

Return true if the arch backend's creates ,,patch-set subdirectory in revision library. baz-1.4 removed this functionality.

This module uses heuristics and does not (intend to) provide the perfect information. Requires constant updating.

Mikhael Goikhman (migo@homemail.comPerl-GPL/arch-perldevel).

For more information, see tla, baz, Arch.