tag-git: allow specifying a release date

For embargoed builds, we need to specify a future date that has been
agreed upon with the affected stakeholders.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

.github/workflows/tag-git.yml

@@ -20,6 +20,9 @@ on:
         description: 'The branch name to use for this release'
         required: false
         default: main
+      release-date:
+        description: 'Override the release date (defaults to today)'
+        required: false
       snapshot:
         description: 'A flag indicating whether this is a snapshot or a full Git for Windows release'
         required: true
@@ -35,6 +38,7 @@ env:
   REPO: "${{github.event.inputs.repo}}"
   REV: "${{github.event.inputs.rev}}"
   RELEASE_BRANCH: "${{github.event.inputs.release-branch}}"
+  RELEASE_DATE: "${{github.event.inputs.release-date}}"
   SNAPSHOT: "${{github.event.inputs.snapshot}}"
   MINGIT_ONLY: "${{github.event.inputs.mingit-only}}"
   CREATE_CHECK_RUN: "true"
@@ -134,6 +138,7 @@ jobs:
             --build-extra-dir="$RUNNER_TEMP/build-extra" \
             --artifacts-dir="$GITHUB_WORKSPACE/bundle-artifacts" \
             --release-branch="$RELEASE_BRANCH" \
+            --release-date="$RELEASE_DATE" \
             $(test "$MINGIT_ONLY" = 'true' && echo '--mingit') \
             "$REV" &&
 

update-scripts/tag-git.sh

@@ -11,13 +11,15 @@ artifacts_dir= &&
 release_branch=main &&
 git_or_mingit="Git for Windows" &&
 snapshot_version=t &&
+release_date= &&
 while case "$1" in
 --git-dir=*) git_git_dir="${1#*=}";;
 --build-extra-dir=*) build_extra_dir="${1#*=}";;
 --artifacts-dir=*) artifacts_dir="${1#*=}";;
 --release-branch=*) release_branch="${1#*=}";;
 --mingit) git_or_mingit="MinGit for Windows";;
 --full|--full-version|--no-snapshot|--no-snapshot-version) snapshot_version=;;
+--release-date=*) release_date="${1#*=}";;
 *) break;;
 esac; do shift; done ||
 die "Could not parse command-line options: $*"
@@ -70,6 +72,9 @@ version_compare () {
 mkdir -p "$artifacts_dir" &&
 if test -n "$snapshot_version"
 then
+	test -z "$release_date" ||
+	die 'Cannot specify --release-date with --no-snapshot-version'
+
 	tag_name="$(git --git-dir "$git_git_dir" describe --match 'v[0-9]*' --exclude='*-[0-9]*' "$git_rev")-$(date +%Y%m%d%H%M%S)" &&
 	tag_message="Snapshot build" &&
 	release_note="Snapshot of $(git --git-dir "$git_git_dir" show -s --pretty='tformat:%h (%s, %ad)' --date=short "$git_rev")" &&
@@ -118,10 +123,13 @@ else
 	ver="$(echo "${tag_name#v}" | sed -n \
 		's/^\([0-9]*\.[0-9]*\.[0-9]*\(-rc[0-9]*\)\?\)\.windows\(\.1\|\(\.[0-9]*\)\)$/\1\4/p')" &&
 
-	release_date="$(LC_ALL=C date +"%B %-d %Y" |
-		sed -e 's/\( [2-9]\?[4-90]\| 1[0-9]\) /\1th /' \
-			-e 's/1 /1st /' -e 's/2 /2nd /' -e 's/3 /3rd /'
-	)" &&
+	if test -z "$release_date"
+	then
+		release_date="$(LC_ALL=C date +"%B %-d %Y" |
+			sed -e 's/\( [2-9]\?[4-90]\| 1[0-9]\) /\1th /' \
+				-e 's/1 /1st /' -e 's/2 /2nd /' -e 's/3 /3rd /'
+		)"
+	fi &&
 	sed -i -e "1s/.*/# $git_or_mingit v$display_version Release Notes/" \
 		-e "2s/.*/Latest update: $release_date/" \
 		"$build_extra_dir"/ReleaseNotes.md &&