RC ISO installs from the rc package channel

pacman-online-rc.conf's [omarchy] repo moves from pkgs.omarchy.org/edge to
pkgs.omarchy.org/rc: an RC ISO now bundles and installs the release-candidate
packages against the package set stable users will get, instead of edge
churn.

configs/airootfs/usr/local/bin/omarchy-install-diagnose-media

@@ -47,21 +47,6 @@ corrupt_package() {
   printf '%s' "$package"
 }
 
-# A retry in the same boot never gets as far as a checksum. The first failure
-# unlinked the package through the bind mount, so pacman now fails opening it,
-# and it names the mirror it read from rather than the cache it writes to.
-deleted_package() {
-  local log match package=""
-
-  for log in "$@"; do
-    [[ -f $log ]] || continue
-    match=$(sed -n "s|.*Could not open file ${OFFLINE_MIRROR}/\([^ ]*\).*|\1|p" "$log" | tail -n 1)
-    [[ -n $match ]] && package="$match"
-  done
-
-  printf '%s' "$package"
-}
-
 expected_checksum() {
   local package="$1" reader
 
@@ -92,14 +77,7 @@ actual_checksum() {
   printf '%s' "${sum%% *}"
 }
 
-# The checksum failure is read first wherever both are in the log: it is the
-# attempt that names the cause, and the open failures after it are its wake.
 package=$(corrupt_package "$@")
-deleted=""
-if [[ -z $package ]]; then
-  package=$(deleted_package "$@")
-  deleted=1
-fi
 if [[ -z $package ]]; then
   exit 1
 fi
@@ -109,20 +87,6 @@ fi
 # filename has no business containing before printing it.
 display_package="${package//[^A-Za-z0-9._+:@%-]/}"
 
-# Nothing can be weighed here: the bytes that failed are gone, and the copy in
-# the mirror went with them. Say which attempt this is, because the screen
-# otherwise repeats the same unreadable error for every retry and the one that
-# explains it scrolled away with the first.
-if [[ -n $deleted ]]; then
-  echo "An earlier attempt deleted this package"
-  echo "pacman rejected it off this ISO and unlinked it from the mirror:"
-  echo "$display_package"
-  echo
-  echo "Reboot before retrying: the deletion is in RAM, so the ISO's copy returns"
-  echo "The first error after that reboot is the one that names the fault"
-  exit 0
-fi
-
 expected=$(expected_checksum "$package")
 actual=$(actual_checksum "$package")
 

configs/pacman-online-rc.conf

@@ -27,7 +27,7 @@ Include = /etc/pacman.d/mirrorlist
 
 [omarchy]
 SigLevel = Optional TrustAll
-Server = https://pkgs.omarchy.org/edge/$arch
+Server = https://pkgs.omarchy.org/rc/$arch
 
 [arch-mact2]
 Server = https://mirror.funami.tech/arch-mact2/os/x86_64

test/unit/install-media-diagnosis-test.sh

@@ -142,65 +142,6 @@ if grep -qF "no longer matches the checksum" <<<"$output"; then
 fi
 pass "a deleted package names the medium without claiming which way it failed"
 
-# Every retry in the same boot fails on the open rather than the checksum, and
-# pacman names the mirror it read from, not the cache it writes to.
-write_retry_log() {
-  local log="$1" path="${2:-$mirror/$PACKAGE}"
-
-  {
-    echo "[dashboard] :: Retrieving packages..."
-    echo "[dashboard] error: failed retrieving file '${path##*/}' from disk : Could not open file $path"
-    echo "[dashboard] error: failed to commit transaction (download library error)"
-    echo "[dashboard] ==> ERROR: Failed to install packages to new root"
-  } >"$log"
-}
-
-write_retry_log "$work/retry.log"
-
-set +e
-output=$(diagnose "$work/retry.log")
-status=$?
-set -e
-
-(( status == 0 )) || fail "a retry after the deletion is diagnosed" "exit status $status"
-[[ $(head -n 1 <<<"$output") == "An earlier attempt deleted this package" ]] ||
-  fail "a retry is diagnosed as a retry" "$output"
-grep -qF "$PACKAGE" <<<"$output" || fail "a retry names the package" "$output"
-grep -qF "Reboot before retrying" <<<"$output" ||
-  fail "a retry says how to get the package back" "$output"
-pass "a retry after the deletion says so instead of going undiagnosed"
-
-# A log holding both attempts must answer with the one that names the cause.
-# The retries come after it and would otherwise win on recency.
-printf 'a package, but damaged\n' >"$mirror/$PACKAGE"
-write_mirror_db "$(printf '0%.0s' {1..64})"
-{
-  cat "$log"
-  cat "$work/retry.log"
-} >"$work/both.log"
-
-set +e
-output=$(diagnose "$work/both.log")
-set -e
-
-[[ $(head -n 1 <<<"$output") == "The install medium is damaged" ]] ||
-  fail "the checksum failure outranks the retries that followed it" "$output"
-pass "the checksum failure outranks the retries that followed it"
-
-# An open failure somewhere other than the mirror was not read off this ISO.
-write_retry_log "$work/retry-elsewhere.log" "/var/tmp/build/$PACKAGE"
-
-set +e
-output=$(diagnose "$work/retry-elsewhere.log")
-status=$?
-set -e
-
-(( status == 1 )) || fail "an open failure outside the mirror is not diagnosed" "exit $status: $output"
-[[ -z $output ]] || fail "an open failure outside the mirror prints nothing" "$output"
-pass "an open failure outside the mirror is not blamed on the medium"
-
-rm "$mirror/$PACKAGE"
-
 # A record with no %SHA256SUM% must not borrow the next record's, which would
 # compare a real file against another package's checksum.
 printf 'a package, but damaged\n' >"$mirror/$PACKAGE"