From d89f0ce632388a8915a330af8dd681e0dbcf2b6c Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Mon, 2 Oct 2023 10:20:27 +0200
Subject: backup: download arch packages from mirror before doing the backup

---
 backup.in | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 61 insertions(+), 5 deletions(-)

diff --git a/backup.in b/backup.in
index 2de7384..2d4a046 100755
--- a/backup.in
+++ b/backup.in
@@ -203,13 +203,69 @@ for toExclude in "${excludes[@]}"; do
   excludeArgs="${excludeArgs} --exclude ${toExclude}"
 done
 
-if [ ! -e "${neues}/wip" ]; then
-  mkdir -p "${neues}/wip"
-fi
-chmod 750 "${neues}"{,/wip}
-chown root:root "${neues}"{,/wip}
+mkdir -p "${neues}/wip"
+mkdir -p "${neues}/tmp"
+chmod 750 "${neues}"{,/wip,/tmp}
+chown root:root "${neues}"{,/wip,/tmp}
 if [ -z "${rsyncShell}" ]; then
   preConnectHook
+  if [ -z "${Quelle#*@*:/}" ]; then
+    ssh "-${ipVer}" "${Quelle%:/}" '
+      pacman-conf Architecture
+      find /var/lib/pacman/local -name desc -exec cat {} +
+    ' \
+    | {
+      read -r arch
+      sed -n '
+        /^%\(NAME\|VERSION\|ARCH\)%/ {
+          N
+          s/\n/ /
+          p
+        }
+      ' \
+      | sed '
+        N
+        N
+        s@^%NAME% \(\S\+\)\n%VERSION% \(\S\+\)\n%ARCH% \(\S\+\)$@\1-\2-\3.pkg.tar.zst@
+        t
+        w /dev/stderr
+        d
+      ' \
+      | while read -r file; do
+        cache_file='/var/cache/pacman/pkg/'"${file}"
+        if [ ! -f "${cache_file}" ]; then
+          case "${arch}" in
+            'x86_64')
+              for url in \
+                'https://mirror.f4st.host/archlinux/pool/packages/'"${file}" \
+                'https://archive.archlinux.org/packages/'"${file:0:1}"'/'"${file%-*}"'/'"${file}"; do
+                curl -Lo "${cache_file}" "${url}" || continue
+                tar --zstd -tf "${cache_file}" >/dev/null 2>&1 && break
+              done
+            ;;
+            'i486'|'i686'|'pentium4')
+              for url in \
+                'https://mirror.archlinux32.org/pool/'"${file}" \
+                'https://archive.archlinux32.org/packages/'"${file:0:1}"'/'"${file%-*}"'/'"${file}"; do
+                curl -Lo "${cache_file}" "${url}" || continue
+                tar --zstd -tf "${cache_file}" >/dev/null 2>&1 && break
+              done
+            ;;
+            *)
+              for url in \
+                'https://mirror.archlinux.org/'"${arch}"'/'{extra,community,core,alarm,aur}'/'"${file}"; do
+                curl -Lo "${cache_file}" "${url}" || continue
+                tar --zstd -tf "${cache_file}" >/dev/null 2>&1 && break
+              done
+            ;;
+          esac
+        fi
+        if [ -f "${cache_file}" ]; then
+          tar -C "${neues:?}/wip/" --zstd -xf "${cache_file}"
+        fi
+      done
+    }
+  fi
   rsync ${rsyncOptions} \
     ${linkdests} \
     ${excludeArgs} \
-- 
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