Installation-instructions.md

@@ -43,8 +43,7 @@ mkosi -i -t directory -o /var/lib/machines/xcache-$(date +%Y-%m-%d-%H%M)
 img_name=xcache-$(date +%Y-%m-%d-%H%M)
 dnf -y --installroot /var/lib/machines/$img_name --releasever=7 install system-release bash yum
 rsync -av /var/local/mkosi/mkosi.extra/ /var/lib/machines/$img_name
-cp /var/local/mkosi/mkosi.postinst /var/lib/machines/$img_name/
-systemd-nspawn -D /var/lib/machines/$img_name /bin/bash
+cp /var/local/mkosi/mkosi.postinst /var/lib/machines/$img_name
 systemd-nspawn -D /var/lib/machines/$img_name bash /mkosi.postinst
 ```
 
@@ -53,15 +52,18 @@ We will map the xrootd user id inside the container (typically 999) to one shift
 ```bash
 # for some reason that command might add a carriage return (therefore the sed) ...
 XRD_UID_INSIDE=$(systemd-nspawn -D /var/lib/machines/$img_name id -u xrootd | sed 's/\r//')
+XRD_GID_INSIDE=$(systemd-nspawn -D /var/lib/machines/$img_name id -g xrootd | sed 's/\r//')
 let "XRD_UID_HOST = $XRD_UID_INSIDE + 65536 * 10"
+let "XRD_GID_HOST = $XRD_GID_INSIDE + 65536 * 10"
 useradd --no-create-home --system -u $XRD_UID_HOST xrootd
+groupmod -g $XRD_GID_HOST xrootd
 ```
 
 # Directories for bind mounts
 Create directories for bind mounts and make them owned by xrootd where nescessary
 ```bash
 mkdir -p /var/spool/xrootd /var/run/xrootd /srv/data/xrootd/namespace /srv/data/xrootd/xrdcinfos /srv/data/xrootd/data
-chown xrootd /var/spool/xrootd /var/run/xrootd /srv/data/xrootd/namespace /srv/data/xrootd/xrdcinfos /srv/data/xrootd/data
+chown xrootd:xrootd /var/spool/xrootd /var/run/xrootd /srv/data/xrootd/namespace /srv/data/xrootd/xrdcinfos /srv/data/xrootd/data
 
 # if not existing
 mkdir -p /etc/grid-security