/[gentoo-x86]/eclass/savedconfig.eclass
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Contents of /eclass/savedconfig.eclass

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Revision 1.13 - (show annotations) (download)
Mon Mar 8 04:31:59 2010 UTC (4 years, 9 months ago) by jer
Branch: MAIN
Changes since 1.12: +6 -8 lines
Do not die on first emerge with USE=savedconfig. Be nice in eerror and die messages thanks to Pawel Hajdan, Jr.

1 # Copyright 1999-2007 Gentoo Foundation
2 # Distributed under the terms of the GNU General Public License v2
3 # $Header: /var/cvsroot/gentoo-x86/eclass/savedconfig.eclass,v 1.12 2009/10/30 16:46:41 vapier Exp $
4
5 # @ECLASS: savedconfig.eclass
6 # @MAINTAINER:
7 # base-system@gentoo.org
8 # @BLURB: common API for saving/restoring complex configuration files
9 # @DESCRIPTION:
10 # It is not uncommon to come across a package which has a very fine
11 # grained level of configuration options that go way beyond what
12 # USE flags can properly describe. For this purpose, a common API
13 # of saving and restoring the configuration files was developed
14 # so users can modify these config files and the ebuild will take it
15 # into account as needed.
16
17 inherit portability
18
19 IUSE="savedconfig"
20
21 # @FUNCTION: save_config
22 # @USAGE: <config files to save>
23 # @DESCRIPTION:
24 # Use this function to save the package's configuration file into the
25 # right location. You may specify any number of configuration files,
26 # but just make sure you call save_config with all of them at the same
27 # time in order for things to work properly.
28 save_config() {
29 if [[ ${EBUILD_PHASE} != "install" ]]; then
30 die "Bad package! save_config only for use in src_install functions!"
31 fi
32 case $# in
33 0) die "Tell me what to save"
34 ;;
35 1) if [[ -f "$1" ]]; then
36 dodir /etc/portage/savedconfig/${CATEGORY}
37 cp "$1" "${D}"/etc/portage/savedconfig/${CATEGORY}/${PF} \
38 || die "Failed to save $1"
39 else
40 dodir /etc/portage/savedconfig/${CATEGORY}/${PF}
41 treecopy "$1" "${D}"/etc/portage/savedconfig/${CATEGORY}/${PF} \
42 || die "Failed to save $1"
43 fi
44 ;;
45 *)
46 dodir "${PORTAGE_CONFIGROOT}"/etc/portage/savedconfig/${CATEGORY}/${PF}
47 treecopy $* "${D}/${PORTAGE_CONFIGROOT}"/etc/portage/savedconfig/${CATEGORY}/${PF} \
48 || die "Failed to save $1"
49 esac
50 elog "Your configuration for ${CATEGORY}/${PF} has been saved in "
51 elog "/etc/portage/savedconfig/${CATEGORY}/${PF} for your editing pleasure."
52 elog "You can edit these files by hand and remerge this package with"
53 elog "USE=savedconfig to customise the configuration."
54 elog "You can rename this file/directory to one of the following for"
55 elog "its configuration to apply to multiple versions:"
56 elog '${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/'
57 elog '[${CTARGET}|${CHOST}|""]/${CATEGORY}/[${PF}|${P}|${PN}]'
58 }
59
60 # @FUNCTION: restore_config
61 # @USAGE: <config files to restore>
62 # @DESCRIPTION:
63 # Restores the configuation saved ebuild previously potentially with user edits.
64 # You can restore a single file or a whole bunch, just make sure you call
65 # restore_config with all of the files to restore at the same time.
66 #
67 # Config files can be laid out as:
68 # @CODE
69 # ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CTARGET}/${CATEGORY}/${PF}
70 # ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CHOST}/${CATEGORY}/${PF}
71 # ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CATEGORY}/${PF}
72 # ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CTARGET}/${CATEGORY}/${P}
73 # ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CHOST}/${CATEGORY}/${P}
74 # ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CATEGORY}/${P}
75 # ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CTARGET}/${CATEGORY}/${PN}
76 # ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CHOST}/${CATEGORY}/${PN}
77 # ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CATEGORY}/${PN}
78 # @CODE
79 restore_config() {
80 use savedconfig || return
81
82 case ${EBUILD_PHASE} in
83 unpack|compile|prepare)
84 ;;
85 *) die "Bad package! restore_config only for use in src_{unpack,compile,prepare} functions!"
86 ;;
87 esac
88 local found check configfile
89 local base=${PORTAGE_CONFIGROOT}/etc/portage/savedconfig
90 for check in {${CATEGORY}/${PF},${CATEGORY}/${P},${CATEGORY}/${PN}}; do
91 configfile=${base}/${CTARGET}/${check}
92 [[ -r ${configfile} ]] || configfile=${base}/${CHOST}/${check}
93 [[ -r ${configfile} ]] || configfile=${base}/${check}
94 einfo "Checking existence of ${configfile} ..."
95 if [[ -r "${configfile}" ]]; then
96 einfo "found ${configfile}"
97 found=${configfile};
98 break;
99 fi
100 done
101 if [[ -f ${found} ]]; then
102 elog "Building using saved configfile ${found}"
103 if [ $# -gt 0 ]; then
104 cp -pPR "${found}" "$1" || die "Failed to restore ${found} to $1"
105 else
106 die "need to know the restoration filename"
107 fi
108 elif [[ -d ${found} ]]; then
109 elog "Building using saved config directory ${found}"
110 local dest=${PWD}
111 pushd "${found}" > /dev/null
112 treecopy . "${dest}" || die "Failed to restore ${found} to $1"
113 popd > /dev/null
114 else
115 # maybe the user is screwing around with perms they shouldnt #289168
116 if [[ ! -r ${base} ]] ; then
117 eerror "Unable to read ${base} -- please check its permissions."
118 die "Reading config files failed"
119 fi
120 ewarn "No saved config to restore - please remove USE=savedconfig or"
121 ewarn "provide a configuration file in ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CATEGORY}/${PN}"
122 ewarn "Your config file(s) will not be used this time"
123 fi
124 }

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