script: add docker core dump debugger

This script sets up a docker container with all the packages used for your Ceph
(test) branch. From there, you can gdb the core dump if you have access to the
test cluster.

Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>

src/script/ceph-debug-docker.sh

@@ -0,0 +1,114 @@
+#!/bin/bash
+
+# This can be run from e.g. the senta machines which have docker available. You
+# may need to run this script with sudo.
+#
+# Once you have booted into the image, you should be able to debug the core file:
+#     $ gdb -q /ceph/teuthology-archive/.../coredump/1500013578.8678.core
+#
+# You may want to install other packages (yum) as desired.
+#
+# Once you're finished, please delete old images in a timely fashion.
+
+set -e
+
+CACHE=""
+
+function run {
+    printf "%s\n" "$*"
+    "$@"
+}
+
+function main {
+    eval set -- $(getopt --name "$0" --options 'h' --longoptions 'help,no-cache' -- "$@")
+
+    while [ "$#" -gt 0 ]; do
+        case "$1" in
+            -h|--help)
+                printf '%s: [--no-cache] <branch> <enviornment>\n' "$0"
+                exit 0
+                ;;
+            --no-cache)
+                CACHE="--no-cache"
+                shift
+                ;;
+            --)
+                shift
+                break
+                ;;
+        esac
+    done
+
+    if [ -z "$1" ]; then
+        printf "specify the branch [default \"master\"]: "
+        read branch
+        if [ -z "$branch" ]; then
+            branch=master
+        fi
+    else
+        branch="$1"
+    fi
+    printf "branch: %s\n" "$branch"
+
+    if [ -z "$2" ]; then
+        printf "specify the build environment [default \"centos:7\"]: "
+        read env
+        if [ -z "$env" ]; then
+            env=centos:7
+        fi
+    else
+        env="$2"
+    fi
+    printf "env: %s\n" "$env"
+
+    if [ -n "$SUDO_USER" ]; then
+        user="$SUDO_USER"
+    elif [ -n "$USER" ]; then
+        user="$USER"
+    else
+        user="$(whoami)"
+    fi
+
+    image="${user}/ceph-ci:${branch}-${env/:/-}"
+
+    T=$(mktemp -d)
+    pushd "$T"
+    if grep ubuntu <<<"$env" > /dev/null 2>&1; then
+        # Docker makes it impossible to access anything outside the CWD : /
+        cp -- /ceph/shaman/cephdev.asc .
+        cat > Dockerfile <<EOF
+FROM ${env}
+
+WORKDIR /root
+RUN apt-get update --yes --quiet && \
+    apt-get install --yes --quiet screen wget gdb software-properties-common python-software-properties apt-transport-https
+COPY cephdev.asc cephdev.asc
+RUN apt-key add cephdev.asc
+RUN add-apt-repository "\$(wget --quiet -O - https://shaman.ceph.com/api/repos/ceph/${branch}/latest/${env/://}/repo)" && \
+    apt-get update --yes && \
+    apt-get install --yes --allow-unauthenticated ceph ceph-mds-dbg ceph-mgr-dbg ceph-mon-dbg ceph-fuse-dbg ceph-test-dbg radosgw-dbg
+EOF
+        time run docker build $CACHE --tag "$image" .
+    else # try RHEL flavor
+        time run docker build $CACHE --tag "$image" - <<EOF
+FROM ${env}
+
+WORKDIR /root
+RUN yum update -y && \
+    yum install -y screen epel-release wget psmisc ca-certificates gdb
+RUN wget -O /etc/yum.repos.d/ceph-dev.repo https://shaman.ceph.com/api/repos/ceph/${branch}/latest/centos/7/repo && \
+    yum clean all && \
+    yum upgrade -y && \
+    yum install -y ceph ceph-debuginfo ceph-fuse
+EOF
+    fi
+    popd
+    rm -rf -- "$T"
+
+    printf "built image %s\n" "$image"
+
+    run docker run -ti -v /ceph:/ceph:ro "$image"
+    return 0
+}
+
+main "$@"