release.sh: update to current version.

release.sh

@@ -4,7 +4,6 @@ set -eo pipefail
 shopt -s extglob
 
 version=$1
-branch_name=$(git rev-parse --abbrev-ref HEAD)
 
 awk-in-place () {
   local tmpfile=$(mktemp)
@@ -35,7 +34,17 @@ crate-names () {
   cargo metadata --format-version 1 --no-deps | jq -r '.packages[].name'
 }
 
+branch-name () {
+  git rev-parse --abbrev-ref HEAD
+}
+
 auto-pr () {
+  local branch_name="$(branch-name)"
+  if [[ "$(branch-name)" = main ]] ; then
+    echo "Cannot auto-pr on main branch." >&2
+    return 1
+  fi
+
   pr_url=$((gh pr view --json url,closed 2>/dev/null || true) \
     | jq -r 'select(.closed | not) | .url')
 
@@ -90,7 +99,7 @@ command -v parse-changelog &>/dev/null || {
   exit 1
 }
 
-if [[ "$branch_name" = main ]] ; then
+if [[ "$(branch-name)" = main ]] ; then
   git switch -c "release-$version"
 fi
 
@@ -106,6 +115,7 @@ awk-in-place Cargo.toml '
   { print }'
 
 # Fix docs.rs links in README, if present
+echo 'Updating links in README.md'
 for name in $(crate-names) ; do
   awk-in-place README.md '{
       sub(/https:\/\/docs\.rs\/'"$name"'\/[0-9]+.[0-9]+.[0-9]+\//, \
@@ -118,7 +128,9 @@ cargo check --quiet
 
 # Do semver checks only if there is a version on crates.io to compare to.
 # FIXME: can’t tell if crates.io search failed for another reason.
-if (cd / && cargo info "$(crate-names | head -1)" &>/dev/null) ; then
+main_crate_name=$(crate-names | head -1)
+if (cd / && cargo info "$main_crate_name" &>/dev/null) ; then
+  echo 'Doing semantic versioning checks'
   cargo semver-checks || { echo ; confirm 'Release anyway?' ; }
 fi