Modernize lts-candidate-stats script (#765)

Co-authored-by: Mark Waite <[email protected]>

Author: NotMyFault

.github/ISSUE_TEMPLATE/1-lts-release-checklist.md

@@ -48,7 +48,7 @@ Remember to exchange the LTS version, release date and Jira URLs.
 
 - [ ] Backport changes, run the [list-issue-commits script](https://github.com/jenkins-infra/release/blob/master/tools/list-issue-commits) to locate commits via Jira ID, some manual work is required to locate them if the issue ID wasn't present at merge time, backport with `git cherry-pick -x $commit`.
 
-- [ ] Open backporting PR with `into-lts` label and summary of changes in description from [lts-candidate-stats script](https://github.com/jenkins-infra/release/blob/master/tools/lts-candidate-stats) and:
+- [ ] Open backporting PR with `into-lts` label and summary of changes in description from [lts-candidate-stats script](https://github.com/jenkins-infra/release/blob/master/tools/lts-candidate-stats.sh) and:
   - [ ] the selected [Jira lts-candidates](https://issues.jenkins-ci.org/issues/?filter=12146).
   - [ ] possible LTS candidates in the [release](https://github.com/jenkins-infra/release/issues?q=is%3Aclosed+label%3Alts-candidate+) repository.
   - [ ] possible LTS candidates in the [packaging](https://github.com/jenkinsci/packaging/issues?q=is%3Aclosed+label%3Alts-candidate) repository.

tools/README.md

@@ -14,7 +14,7 @@ There is a couple of manual tasks that needs to follow described in the output.
 
 ### Backporting
 
-Process through [LTS Candidates](https://issues.jenkins.io/issues/?filter=12146) and update label `lts-candidate` to `${VERSION}-fixed` or `${VERSION}-rejected`. See `lts-candidate-stats <next_lts_version>` for status report.
+Process through [LTS Candidates](https://issues.jenkins.io/issues/?filter=12146) and update label `lts-candidate` to `${VERSION}-fixed` or `${VERSION}-rejected`. See `./lts-candidate-stats.sh <next_lts_version>` for status report.
 
 #### Identify issue commits
 

tools/lts-candidate-stats

@@ -0,0 +1,65 @@
+#!/usr/bin/env bash
+
+set -e
+
+if [ -z "$(command -v xmllint)" ]; then
+    echo "Error: xmllint is not installed. Please install it to continue." >&2
+    exit 1
+fi
+
+PREFIX="https://issues.jenkins.io/sr/jira.issueviews:searchrequest-xml/temp/SearchRequest.xml?tempMax=1000&jqlQuery="
+
+if [ "$#" -ne 1 ]; then
+    echo "Usage: ./lts-candidate-stats.sh <version>" >&2
+    exit 1
+fi
+
+label_version_dot="$1"
+
+targetVersion=$(mvn help:evaluate -Dexpression=project.version -q -DforceStdout --batch-mode)
+if [[ "$targetVersion" != *"$version"* ]]; then
+    echo "The previous version does not appear to be released yet: $targetVersion" >&2
+    exit 1
+fi
+
+git fetch upstream master:master
+echo "Latest core version: $(git describe master --abbrev=0)"
+
+fetch_issues() {
+    local url="$1"
+    curl -s "$url" | xmllint --xpath "//*[local-name()='item']" - 2>/dev/null | \
+    awk '
+    /<item/ {initem=1; title=""; link=""}
+    /<\/item>/ {if (title && link) print "- " title " (" link ")"; initem=0}
+    initem && /<title>/ {sub(/.*<title>/,""); sub(/<\/title>.*/,""); title=$0}
+    initem && /<link>/ {sub(/.*<link>/,""); sub(/<\/link>.*/,""); link=$0}
+    '
+}
+
+fetch_postponed_candidates() {
+    local url="$1"
+    curl -s "$url" | xmllint --xpath "//*[local-name()='item']" - 2>/dev/null | \
+    awk -v rejected="${label_version_dot}-rejected" '
+    /<item/ {initem=1; title=""; link=""; label=""}
+    /<\/item>/ {
+        if (title && link && label ~ rejected)
+            print "- " title " (" link ")";
+        initem=0
+    }
+    initem && /<title>/ {sub(/.*<title>/,""); sub(/<\/title>.*/,""); title=$0}
+    initem && /<link>/ {sub(/.*<link>/,""); sub(/<\/link>.*/,""); link=$0}
+    initem && /<label>.*<\/label>/ {
+        sub(/.*<label>/,"");
+        sub(/<\/label>.*/,"");
+        if ($0 ~ rejected) {
+            label=$1;
+        }
+    }
+    '
+}
+
+echo -e "\nFixed:\n------------------"
+fetch_issues "${PREFIX}labels%3D${label_version_dot}-fixed"
+
+echo -e "\nPostponed:\n------------------"
+fetch_postponed_candidates "https://issues.jenkins.io/sr/jira.issueviews:searchrequest-xml/12146/SearchRequest-12146.xml?tempMax=1000"