Description:	Standardized installer program.
Min:		0
Max:		1
Show-Pid:	0
Usage:		[top-directory] <LIST

[prefix]

[options]
-v --verbose FLAG=1 opt_verbose
List the files as they are processed

-n --dry-run FLAG=1 opt_dryrun
Don't modify any files, just display

-c --check FLAG=1 opt_check
Check destinations instead of installing

[suffix]
See http://untroubled.org/bglibs/docs/group__installer.html
for more information

[description]

The program @command{bg-installer} reads an installation instruction
file from standard input, and executes the instructions in the
directory named on the command line.

Each line in the file is an individual instruction.  Blank lines and
lines beginning with @samp{#} are ignored.  Lines beginning with
@samp{>}, if present, instruct bg-installer as to which base directory
to use (see below).  All other lines must have following format:

@verbatim
CMD:[OWNER]:[GROUP]:MODE:DIR[:FILENAME[:SOURCE]]
@end verbatim

@table @var

@item CMD

is a single character specifying the installation command, optionally
followed by @samp{?} indicating the command should only execute if the
source exists.  If the @samp{?} is followed by a name, it is used
instead of @var{SOURCE} as the filename to test.

@item OWNER

(optional) is the owner user ID or name for the target file.

@item GROUP

(optional) is the group ID or name for the target file.

@item MODE

is the permissions of the installed file in octal.

@item DIR

is the subdirectory of the installation prefix for the destination file.

@item FILENAME

(optional) is the name of the file to install into the directory.  It
may be omitted for directories.

@item SOURCE

(optional) is the name of the source file to install, if it differs
from the destination file, or the path in the symlink.

@end table

If @var{SOURCE} contains wildcards, the command is repeated once for each
matching filename.

If @var{FILENAME} is empty, it is replaced with the value of
@var{SOURCE} after wildcard expansion.  Each instance of @samp{$N} in
@var{FILENAME} where @samp{N} is a single digit is replaced with the
Nth part of the source filename.  @samp{$0} is replaced with the whole
source filename.

The target filename is @samp{PREFIX/TOP/DIR/FILENAME} where
@samp{PREFIX} is the value of @var{$install_prefix} if it is set,
@var{TOP} is the directory given on the command line, and @var{DIR}
and @var{FILENAME} given in the installation file.

@itemize

@item @samp{c} lines copy regular files from the current directory

@item @samp{d} lines create directories

@item @samp{s} lines create symlinks (@var{UID}, @var{GID}, and @var{MODE} are ignored)

@item @samp{l} lines copy libraries using libtool

@end itemize

When @command{bg-installer} encounters a base directory directive, as
indicated above, it opens the file named @file{conf-BASE} (where
@var{BASE} is the word on the directive line), reads the first line,
and uses that as the base directory (prefixed by @env{$install_prefix}
as above).

[examples]
@verbatim
>bin
c:::755::prog2
c?:root:root:4750::prog2
>include
d:::755:package
c:::644:package:base.h:pkgbase.h
s:::::package.h:package/base.h
@end verbatim

This reads @file{conf-bin}, and installs @file{prog1} and setuid root
@file{prog2} (if it was built) under it.  It then reads
@file{conf-include}, creates the directory @file{package} under it,
and installs @file{pkgbase.h} as @file{base.h} in that directory. It
also creates a symlink @file{package.h} to @file{package/base.h}.

[environment]
@table @env

@item install_prefix

If set, is prefixed to all destination file names.

@end table

[author]
Bruce Guenter <bruce@untroubled.org>