run: drop to autobuild-ceph user before doing anything much

logrotate has changed such that, if root, it won't run if
logrotate.conf is not owned by root.  Since we really want to be
running as autobuild-ceph anyway, just do that first by reexecuting
ourselves with su - autobuild-ceph.

Signed-off-by: Dan Mick <dan.mick@redhat.com>

diff --git a/run b/run
index ef8324d43f1ab1d424fb7a3c96533ffcb8902173..c20354068b9281e00e2d8a4a4e1b822776b6b499 100755 (executable)
--- a/run
+++ b/run
@@ -1,29 +1,30 @@
 #!/bin/sh
 set -e
 
-if command -v logrotate >/dev/null; then
-  logrotate --state=logs/.logrotate.status logrotate.conf
-fi
-
-exec >>logs/stdout.log 2>>logs/stderr.log
-
-cd gitbuilder.git
-FILE_OWNER="$(stat --format='%U' out)"
+FILE_OWNER="$(stat --format='%U' gitbuilder.git/out)"
 CUR_USER="$(id -un)"
 if [ "$FILE_OWNER" = "root" ]; then
     echo "$0: root should never own the build tree, aborting." 1>&2
     exit 1
 fi
 
-if [ "$CUR_USER" = "$FILE_OWNER" ]; then
-    # we're already the right user
-
-    exec ../run-real
-elif [ "$CUR_USER" = "root" ]; then
-    # drop down to the right user;
+if [ "$CUR_USER" = "root" ]; then
+    # reexecute as the right user;
     # override /bin/false as shell in passwd
-    exec su -s /bin/sh -c ../run-real "$FILE_OWNER"
-else
+    echo "$0: I'm root, reexecuting as $FILE_OWNER"
+    exec su -s /bin/sh -c "$0 $*" $FILE_OWNER
+fi
+
+if [ "$CUR_USER" != "$FILE_OWNER" ]; then
     echo "$0: not root and not file owner, aborting." 1>&2
     exit 1
 fi
+
+if command -v logrotate >/dev/null; then
+  logrotate -v --state=logs/.logrotate.status logrotate.conf
+fi
+
+exec >>logs/stdout.log 2>>logs/stderr.log
+
+cd gitbuilder.git
+exec ../run-real