script/ceph-backport.sh: Add prepare function

Add a new flag, --prepare, that when used will fetch all necessary info and
cherrypick all original commits automatically.
It will also prevent the main code to be executed.

After running with --prepare, and if there were no conflicts, you can simply
remove the flag from the command and run the script again.
This time it will run the main code and create the PR and update the backport
issue.

p.e.:
ceph-backport.sh 19206 jewel --prepare
ceph-backport.sh 19206 jewel

Signed-off-by: Tiago Melo <tmelo@suse.com>

diff --git a/src/script/ceph-backport.sh b/src/script/ceph-backport.sh
index e40c7559ab6195c57dcd94874e778c1aa06b5af7..9d680ebab3d8ca76e6f81a17b59f1f52b623d355 100755 (executable)
--- a/src/script/ceph-backport.sh
+++ b/src/script/ceph-backport.sh
@@ -31,17 +31,19 @@
 #
 # Once you have the actual values for the above variables, create a file
 # $HOME/bin/backport_common.sh with the following contents
-# 
+#
 # redmine_key=[your_redmine_key]
 # redmine_user_id=[your_redmine_user_id]
 # github_token=[your_github_personal_access_token]
 # github_user=[your_github_username]
 #
-# You can also optionally add the remote repo's name in this file, like
+# You can also optionally add yours and ceph remote repo's name in this file,
+# like
 #
 # github_repo=[your_github_repo_name]
+# ceph_repo=[ceph_github_repo_name]
 #
-# If you don't add it, it will default to "origin".
+# If you don't add it, it will default to "origin" and "upstream", respectively.
 #
 # Obviously, since this file contains secrets, you should protect it from
 # exposure using all available means (restricted file privileges, encrypted
@@ -58,6 +60,13 @@
 # http://tracker.ceph.com/issues/19206 (a jewel backport)
 # becomes something like this:
 #
+# For simple backports you can just run:
+#
+# ceph-backport.sh 19206 jewel --prepare
+# ceph-backport.sh 19206 jewel
+#
+# alternatively, you can prepare the backport manually:
+#
 # git remote add ceph http://github.com/ceph/ceph.git
 # git fetch ceph
 # git checkout -b wip-19206-jewel ceph/jewel
@@ -84,10 +93,11 @@ test "$redmine_user_id" || failed_required_variable_check redmine_user_id
 test "$github_token"    || failed_required_variable_check github_token
 test "$github_user"     || failed_required_variable_check github_user
 : "${github_repo:=origin}"
+: "${ceph_repo:=upstream}"
 
 function usage () {
     echo "Usage:"
-    echo "   $0 [BACKPORT_TRACKER_ISSUE_NUMBER] [MILESTONE]"
+    echo "   $0 [BACKPORT_TRACKER_ISSUE_NUMBER] [MILESTONE] [--prepare]"
     echo
     echo "Example:"
     echo "   $0 19206 jewel"
@@ -132,7 +142,42 @@ then
 fi
 
 title=$(curl --silent 'http://tracker.ceph.com/issues/'$issue.json?key=$redmine_key | jq .issue.subject | tr -d '\\"')
-echo "Issue title: $title" 
+echo "Issue title: $title"
+
+function prepare () {
+    related_issue=$(curl --silent http://tracker.ceph.com/issues/$issue.json?include=relations |
+                    jq '.issue.relations[] | select(.relation_type | contains("copied_to")) | .issue_id')
+    [ -z "$related_issue" ] && echo "Could not find original issue." && return 1
+    echo "Original issue: $related_issue"
+
+    pr=$(curl --silent http://tracker.ceph.com/issues/$related_issue.json |
+         jq '.issue.custom_fields[] | select(.id | contains(21)) | .value' |
+         tr -d '\\"')
+    [ -z "$pr" ] && echo "Could not find PR." && return 1
+    echo "Original PR: $pr"
+
+    number=$(curl --silent 'https://api.github.com/repos/ceph/ceph/pulls/'$pr | jq .commits)
+    [ -z "$number" ] && echo "Could not determine the number of commits." && return 1
+    echo "Found $number commit(s)"
+
+    git fetch $ceph_repo
+    echo "fetch latest $milestone branch."
+
+    git checkout $ceph_repo/$milestone -b wip-$issue-$milestone
+
+    git fetch $ceph_repo pull/$pr/head:pr-$pr
+
+    git cherry-pick -x pr-$pr~$number..pr-$pr
+    echo "cherry picked pr-$pr into wip-$issue-$milestone"
+
+    exit 0
+}
+
+if [[ $* == *--prepare* ]]
+then
+    echo "'--prepare' found, will only prepare the backport"
+    prepare
+fi
 
 git push -u $github_repo wip-$issue-$milestone