From 7231f47b26236cb2500057fb98a4771799220385 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gonzalo=20Tornar=C3=ADa?= <tornaria@cmat.edu.uy>
Date: Sun, 5 Dec 2021 20:14:14 -0300
Subject: [PATCH] etc/conf: implement XBPS_MIRROR for remote repos

Setting this variable will make xbps-src use an alternative mirror for
remote repositories.

Using this variable one can change the remote repository for all
architectures in a single setting and without the need to modify
`etc/xbps.d/repos-remote*.conf`. This is much more convenient as it
allows changing remote repos without a dirty worktree.

To use just add a line like the following to `etc/conf`:

    XBPS_MIRROR=https://repo-us.voidlinux.org/current

We also disable 00-repository-main.conf for cross so we don't use the
remote repo from the xbps package.
---
 common/xbps-src/shutils/chroot.sh | 29 +++++++++++++++++++----------
 etc/defaults.conf                 |  9 +++++++--
 2 files changed, 26 insertions(+), 12 deletions(-)

diff --git a/common/xbps-src/shutils/chroot.sh b/common/xbps-src/shutils/chroot.sh
index 53e3d4a4c70..a7100d4ea56 100644
--- a/common/xbps-src/shutils/chroot.sh
+++ b/common/xbps-src/shutils/chroot.sh
@@ -237,26 +237,33 @@ chroot_sync_repodata() {
             $confdir/12-repository-local-multilib.conf
     fi
 
+    # mirror_sed is a sed script: nop by default
+    local mirror_sed
+    if [ -n "$XBPS_MIRROR" ]; then
+        # when XBPS_MIRROR is set, mirror_sed rewrites remote repos
+        mirror_sed="s|^repository=http.*/current|repository=${XBPS_MIRROR}|"
+    fi
+
     if [ "$XBPS_SKIP_REMOTEREPOS" ]; then
         rm -f $confdir/*remote*
     else
         if [ -s "${XBPS_DISTDIR}/etc/xbps.d/repos-remote-${XBPS_MACHINE}.conf" ]; then
             # If per-architecture base remote repo config exists, use that
-            install -Dm644 ${XBPS_DISTDIR}/etc/xbps.d/repos-remote-${XBPS_MACHINE}.conf \
-                $confdir/20-repository-remote.conf
+            sed -e "$mirror_sed" ${XBPS_DISTDIR}/etc/xbps.d/repos-remote-${XBPS_MACHINE}.conf \
+                > $confdir/20-repository-remote.conf
         else
             # Otherwise use generic base for musl or glibc
             local suffix=
             case "$XBPS_MACHINE" in
                 *-musl) suffix="-musl";;
             esac
-            install -Dm644 ${XBPS_DISTDIR}/etc/xbps.d/repos-remote${suffix}.conf \
-                $confdir/20-repository-remote.conf
+            sed -e "$mirror_sed" ${XBPS_DISTDIR}/etc/xbps.d/repos-remote${suffix}.conf \
+                > $confdir/20-repository-remote.conf
         fi
         # Install multilib conf for remote repos if it exists for the architecture
         if [ -s "${XBPS_DISTDIR}/etc/xbps.d/repos-remote-${XBPS_MACHINE}-multilib.conf" ]; then
-            install -Dm644 ${XBPS_DISTDIR}/etc/xbps.d/repos-remote-${XBPS_MACHINE}-multilib.conf \
-                $confdir/22-repository-remote-multilib.conf
+            sed -e "$mirror_sed" ${XBPS_DISTDIR}/etc/xbps.d/repos-remote-${XBPS_MACHINE}-multilib.conf \
+                > $confdir/22-repository-remote-multilib.conf
         fi
     fi
 
@@ -266,6 +273,8 @@ chroot_sync_repodata() {
     if [ -n "$XBPS_CROSS_BUILD" ]; then
         rm -rf $XBPS_MASTERDIR/$XBPS_CROSS_BASE/etc/xbps.d
         mkdir -p $XBPS_MASTERDIR/$XBPS_CROSS_BASE/etc/xbps.d
+        # Disable 00-repository-main.conf from share/xbps.d (part of xbps)
+        ln -s /dev/null $XBPS_MASTERDIR/$XBPS_CROSS_BASE/etc/xbps.d/00-repository-main.conf
         # copy xbps.d files from host for local repos
         cp ${XBPS_MASTERDIR}/etc/xbps.d/*local*.conf \
             $XBPS_MASTERDIR/$XBPS_CROSS_BASE/etc/xbps.d
@@ -274,15 +283,15 @@ chroot_sync_repodata() {
         else
             # Same general logic as above, just into cross root, and no multilib
             if [ -s "${XBPS_DISTDIR}/etc/xbps.d/repos-remote-${XBPS_TARGET_MACHINE}.conf" ]; then
-                install -Dm644 ${XBPS_DISTDIR}/etc/xbps.d/repos-remote-${XBPS_TARGET_MACHINE}.conf \
-                    $crossconfdir/20-repository-remote.conf
+                sed -e "$mirror_sed" ${XBPS_DISTDIR}/etc/xbps.d/repos-remote-${XBPS_TARGET_MACHINE}.conf \
+                    > $crossconfdir/20-repository-remote.conf
             else
                 local suffix=
                 case "$XBPS_TARGET_MACHINE" in
                     *-musl) suffix="-musl"
                 esac
-                install -Dm644 ${XBPS_DISTDIR}/etc/xbps.d/repos-remote${suffix}.conf \
-                    $crossconfdir/20-repository-remote.conf
+                sed -e "$mirror_sed" ${XBPS_DISTDIR}/etc/xbps.d/repos-remote${suffix}.conf \
+                    > $crossconfdir/20-repository-remote.conf
             fi
         fi
 
diff --git a/etc/defaults.conf b/etc/defaults.conf
index 58369e95cbc..e3876cdc7d2 100644
--- a/etc/defaults.conf
+++ b/etc/defaults.conf
@@ -14,13 +14,18 @@
 # rely on this to work properly.
 #
 
+# [OPTIONAL]
+# Use an alternative mirror for remote repositories. This is more
+# convenient than modifying etc/xbps.d/repos-remote*.conf.
+#
+#XBPS_MIRROR=https://repo-us.voidlinux.org/current
+
 # [OPTIONAL]
 # Enable optional arguments to xbps-install(1) for the host system.
 # Currently used in the 'binary-bootstrap' and 'bootstrap-update' targets.
 #
 # NOTE: local repositories are handled automatically by xbps-src,
-# but you can modify the default remote repositories at
-# 'etc/xbps.d/repos-remote*.conf'
+# and remote repositories can be changed by setting XBPS_MIRROR
 #
 #XBPS_INSTALL_ARGS=""