A user could not override system-wide settings in their ~/.my.cnf,
because the DEFAULT_SYSCONFDIR was being searched last. Also, in
some configurations (especially when the --sysconfdir compile-time
option is set to /etc or /etc/mysql), the system-wide my.cnf file
was read multiple times, causing confusion and potential problems.
Rearrange default directories to conform to the manual and logic.
Move --sysconfdir=<path> (DEFAULT_SYSCONFDIR) from the last default
directory to the middle of the list. $HOME/.my.cnf should be last,
so the user is able to override the system-wide settings.
Change init_default_directories() to remove duplicates from the
list.
include/my_sys.h:
Add array_append_string_unique(), from mf_arr_appstr.c
libmysql/Makefile.shared:
Add new mf_arr_appstr.lo object
mysys/CMakeLists.txt:
Add new mf_arr_appstr.c source.
mysys/Makefile.am:
Add new mf_arr_appstr.c source.
mysys/default.c:
Change order in which defaults files are added to default_directories,
in order to conform to the manual (and to common sense). This fixes
a particularly bad problem on Unix, where ~/.my.cnf was read before
/usr/local/etc/my.cnf.
Also, don't add duplicate entries; move the existing entry to the
end of the list instead.
Here is a comparison of the order of defaults files, BEFORE and AFTER
this patch.
On Windows:
BEFORE: C:\, GetWindowsDirectory(), GetSystemWindowsDirectory(),
$MYSQL_HOME, defaults-extra-file, INSTALLDIR
AFTER: GetSystemWindowsDirectory(), GetWindowsDirectory(), C:\,
INSTALLDIR, $MYSQL_HOME, defaults-extra-file
GetSystemWindowsDirectory() is moved before GetWindowsDirectory() because
the former is shared by all Terminal Services users, while the latter is
private for each user.
On Netware (no change):
BEFORE: sys:/etc/, $MYSQL_HOME, defaults-extra-file
AFTER: sys:/etc, $MYSQL_HOME, defaults-extra-file
On OS/2:
BEFORE: $ETC, /etc, $MYSQL_HOME, defaults-extra-file
AFTER: /etc, $ETC, $MYSQL_HOME, defaults-extra-file
On everything else (general Unix):
BEFORE: /etc, $MYSQL_HOME, defaults-extra-file, ~/, --sysconfdir
AFTER: /etc/, --sysconfdir, $MYSQL_HOME, defaults-extra-file, ~/
The BEFORE code added --sysconfdir on all systems, but only the
Unix build system actually defined a value for it.
mysys/mf_arr_appstr.c:
BitKeeper file /home/tsmith/m/bk/build/50-b20748/mysys/mf_arr_appstr.c
