Patch: add basic package management for 'install'

[assirati]

Hello,

Attached is a patch that extends the functionality of Coreutils  
install creating a basic package management capability. If it is to be  
considered useful or viable, I would like very much to receive  
reveiews, suggestions for improvements or bug reports. My purpose is  
to get the code integrated to Coreutils 'install'.

Thank you,
Joao Luis.

** RATIONALE **

When installing programs from upstream source code, 'install' is the  
traditional way makefiles install files to /usr/local or other  
locations. After that, it is difficult to get a full listing of what  
was installed where, and usually one must keep the source code so it  
is possible to 'make uninstall' in the future, in case the makefile  
provides this possibility.

This patch allows 'install' to make a list of all installed files and  
created directories, making it easy to track all files and uninstall  
the "package".

** USAGE **

With this patch, when 'install' is executed with the command line options

-l FILE

or

--list=FILE

it will append to FILE the canonicalized name of the installed file or  
directory.

For example

install -l file_list -D my_file /usr/local/my_dir/my_file

or

install --list=file_list -D my_file /usr/local/my_dir/my_file

or

export INSTALL_LIST=file_list
install -D my_file /usr/local/my_dir/my_file

will append to file_list (or create it if it doesn't exist) containing

/usr/local/my_dir
/usr/local/my_dir/my_file

After that, files and directories may be easily uninstalled with

tac file_list | while read f; do test -d "$f" && \rmdir "$f" || \rm  
"$f"; done; \rm file_list

** USE CASES **

Install may be called in new makefiles with the option -l to generate  
a list of installed files and direcory. For legacy makefiles, one can  
execute

INSTALL_LIST=somefile make install

or

export INSTALL_LIST=somefile
make install

or the like.

** DETAILS **

A global variable

static FILE *install_list = NULL;

was created to hold the stream for the file list. This stream is  
fopen()ed for append in main() and closed by the atexit() handler  
close_install_list().

A function

static void install_list_append (const char *fname)

was created to write to the file list. This function is called by:

make_ancestor(), to record all the created parent directories (case of  
option -D)

process_dir(), to record a created dir (case of option -d)

install_file_in_file(), to record installed files.

install-list.diff
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