postgresql-setup: multi-upgrade configuration

Turns out we need to support upgrade from more than one previous
database versions.  The plan is to make this as general as easily
possible, "run-time" configurable without need to recompile.

* postgresql-setup.in: Add options --upgrade-from and
--upgrade-ids.  Require root access (as late as possible).
($USAGE_STRING): Adjust help output accordingly.
($PGMAJORVERSION, $PREVMAJORVERSION)
($PREVPGENGINE): Remove newly useless globals.
($option_upgradefrom): New option default.
(set_var, root_prereq): New helper functions.
(parse_upgrade_setup): Helper function to parse upgrade
configuration.
(print_version): Don't print PREVMAJORVERSION as it is (with
configuration) useless.
(upgrade): Create new $inplace local to handle in-place and
copy-like migrations differently.  Use the variable set generated
by parse_upgrade_setup() function.  Small err message fixes.
(handle_service_env, handle_pgconf): Remove the MODE argument.
(parse_configuration): Generalize operations which needed to be
done on two places.
* upgrade_config.template: Example of ./configure time config
file.  Based on files like this the run-time is generated.
* share/postgresql-setup/.gitignore: New file.
* share/postgresql-setup/Makefile.inc: New file.
* build-helpers/build-config: New file, generator of configuration
files.
* build-helpers/Makefile.inc: New file.
* Makefile.am: Distribute upgrade_config.template.  Start the
conversion to flat Makefile and include two new Makefile.inc
snippets.
* configure.ac: New --with-upgrade-config option.  Propagate the
rawpkgdatadir and UPGRADE_CONFIG_LIST variables into Makefile.
(INSTANTIATE): Enhance to create the leading path also.
(INSTANTIATE_CONV): Convenience helper for leading path of target
creation.
* auxdir/install_local: New (just-for-git) installation helper.
* .gitignore: Don't hide share/postgresql-setup.
* TODO: Mention that KDE folks would like to migrate somehow.

1 files changed, 15 insertions, 1 deletions

diff --git a/configure.ac b/configure.ac
index a793a07..d6476f6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -27,6 +27,15 @@ AC_ARG_WITH([sysvinit],
     [WANT_SYSVINIT=0]
 )
 
+AC_ARG_WITH([upgrade-config],
+    AS_HELP_STRING([--with-upgrade-config=/file/path,/path2],
+                   [List of files to be used as an upgrade configuration]),
+    [UPGRADE_CONFIG_LIST="$withval"],
+    [UPGRADE_CONFIG_LIST="upgrade_config.template"]
+)
+
+AC_SUBST([UPGRADE_CONFIG_LIST])
+
 AM_CONDITIONAL([WANT_SYSVINIT], [test "$WANT_SYSVINIT" -eq 1])
 
 # Instatiating generated files by sed instead of config.status.
@@ -54,23 +63,28 @@ sed_subst_var_pattern(pkgname)
 sed_subst_var_pattern(POSTGRES_HOMEDIR)
 sed_subst_var_pattern(PREVMAJORVERSION)
 sed_subst_var_pattern(PREVPGENGINE)
+sed_subst_var_pattern(rawpkgdatadir)
 sed_subst_var_pattern(README_DIST)
 sed_subst_var_pattern(SU_POSTGRES)
 sed_subst_var_pattern(systemdunitsdir)
 sed_subst_var_pattern(userunitsdir)
 sed_subst_var_pattern(TEST_GEN_FILES_LIST)
 sed_subst_var_pattern(VERSION)
+sed_subst_var_pattern(UPGRADE_CONFIG_LIST)
 	-e 's|@__FILE__[[@]]|\$@|g'"
 
 SED_CALL="\$(SED) \$(SED_RULES)"
 m4_pattern_allow(AM_V_GEN)
-INSTANTIATE="\$(AM_V_GEN)\$(SED_CALL) \$< > \$@"
+
+INSTANTIATE_CONV="\$(AM_V_GEN)rm -rf \$@; \$(MKDIR_P) \$(@D)"
+INSTANTIATE="\$(INSTANTIATE_CONV) && \$(SED_CALL) \$< > \$@ && chmod -w \$@"
 INSTANTIATE_SCRIPT="\$(INSTANTIATE) && chmod +x \$@"
 c_s='$(top_builddir)/config.status'
 
 AC_SUBST([SED_RULES])
 AC_SUBST([SED_CALL])
 AC_SUBST([INSTANTIATE])
+AC_SUBST([INSTANTIATE_CONV])
 AC_SUBST([INSTANTIATE_SCRIPT])
 AC_SUBST([c_s])