app-backup/portage-snapper: new package, add 0.3.0

Signed-off-by: Keita Urashima <ursm@ursm.jp>

app-backup/portage-snapper/Manifest

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+DIST portage-snapper-0.3.0.tar.gz 5283 BLAKE2B 386d81ec247073f67aab3a07ab3cc045db9436bd4e6744106a412900fc2fd736392a8eac4243b0a7e9b45f5cb8250ba4cd8c006b77f0806722f8ee0ba9c923be SHA512 1dad1cd274223a69bbcb10481986568b50b9c8ffda0267fa4c53ea0b53e451ff0bf0280bc478681e4f34cdc788d47c341c6f8d0f3e24394a3eed43dc4a6379ce

app-backup/portage-snapper/metadata.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="person">
+		<email>ursm@ursm.jp</email>
+		<name>Keita Urashima</name>
+	</maintainer>
+	<upstream>
+		<remote-id type="github">ursm/portage-snapper</remote-id>
+	</upstream>
+</pkgmetadata>

app-backup/portage-snapper/portage-snapper-0.3.0.ebuild

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+# Copyright 2026 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+DESCRIPTION="Snapper snapshots around Portage transactions, snap-pac style"
+HOMEPAGE="https://github.com/ursm/portage-snapper"
+SRC_URI="https://github.com/ursm/${PN}/archive/refs/tags/v${PV}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="MIT"
+SLOT="0"
+KEYWORDS="~amd64"
+
+RDEPEND="app-backup/snapper"
+
+src_install() {
+	emake DESTDIR="${D}" install
+	einstalldocs
+}
+
+pkg_postinst() {
+	elog "The scripts are installed, but /etc/portage/ is left untouched."
+	elog "Enable portage-snapper manually:"
+	elog
+	elog "  1. Add to /etc/portage/bashrc:"
+	elog "       source /usr/share/portage-snapper/hook.bash"
+	elog
+	elog "  2. Point /etc/portage/bin/post_emerge at it, e.g. as a symlink:"
+	elog "       ln -s /usr/share/portage-snapper/post_emerge /etc/portage/bin/post_emerge"
+	elog "     or call it from your own post_emerge wrapper."
+	elog
+	elog "Tune behavior in /etc/portage-snapper.conf. A configured snapper config"
+	elog "is required (default: root)."
+}