#StackBounty: #permissions #filesystem #ext4 #groups All of a sudden I'm getting permission errors

Bounty: 50

I’m running Ubuntu 16.04.4 LTS and facing a problem.
All of a sudden I’m unable to edit files that I could before, I cannot run programs due to permission errors.

I’m always logged in as a user ejaz belonging to primary group ejaz and secondary groups root adm cdrom sudo dip www-data plugdev lpadmin sambashare kismet wireshark docker. I have several websites in sub-directories of /var/www/html/ (not in ~/public_html because it is a dev machine with no security/sharing considerations). Taking a website, /var/www/html/test, for example; it belongs to user:group www-data:www-data. Me, logged in as ejaz, am getting permission errors while editing files in test directory. I seem to have correct group permissions to edit this directory.

Output of groups command

~ » groups ejaz                                                                                                                                                              
ejaz : ejaz root adm cdrom sudo dip www-data plugdev lpadmin sambashare kismet wireshark docker

Permissons for test site

/var/www/html » l | grep test
drwxrwxr-x  2 www-data www-data 4.0K Apr  9  2017 test

But any editing results in permission errors

/var/www/html » cd test 

/var/www/html/test » l                                                                                                                                                           
total 16K
drwxrwxr-x  2 www-data www-data 4.0K Apr  9  2017 .
drwxrwxr-x 87 www-data www-data 4.0K Jul 10 06:50 ..
-rw-rw-r--  1 www-data www-data    0 Apr  9  2017 blah.html
-rw-rw-r--  1 www-data www-data   16 Apr  9  2017 .htaccess
-rw-rw-r--  1 www-data www-data   73 Apr  9  2017 index1.html

/var/www/html/test » touch blah.html
touch: cannot touch 'blah.html': Permission denied

Output of id command

/var/www/html/test » id -Gn
ejaz

which is understandable since ejaz is the primary group.

But If I su as ejaz, I’m able to edit the file in terminal and in any program that is launched from that particular terminal instance

Question

Why am I not able to edit the files all of a sudden and how was I able to edit those files before? All I did since yesterday was to run Ubuntu’s apt upgrade.

Any help will be greatly appreciated.
Thanks for reading.

Update

Output of sudo mount command

~ » sudo mount                                                                    
[sudo] password for ejaz: 
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
udev on /dev type devtmpfs (rw,nosuid,relatime,size=4021496k,nr_inodes=1005374,mode=755)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,noexec,relatime,size=808412k,mode=755)
/dev/sda1 on / type ext4 (rw,relatime,errors=remount-ro,data=ordered)
securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
tmpfs on /run/lock type tmpfs (rw,nosuid,nodev,noexec,relatime,size=5120k)
tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd)
pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime)
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls,net_prio)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpu,cpuacct)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb)
cgroup on /sys/fs/cgroup/pids type cgroup (rw,nosuid,nodev,noexec,relatime,pids)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=27,pgrp=1,timeout=0,minproto=5,maxproto=5,direct)
debugfs on /sys/kernel/debug type debugfs (rw,relatime)
mqueue on /dev/mqueue type mqueue (rw,relatime)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime)
fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime)
/var/lib/snapd/snaps/core_4917.snap on /snap/core/4917 type squashfs (ro,nodev,relatime)
/var/lib/snapd/snaps/core_4650.snap on /snap/core/4650 type squashfs (ro,nodev,relatime)
/var/lib/snapd/snaps/core_4830.snap on /snap/core/4830 type squashfs (ro,nodev,relatime)
/var/lib/snapd/snaps/pycharm-community_62.snap on /snap/pycharm-community/62 type squashfs (ro,nodev,relatime)
/var/lib/snapd/snaps/pycharm-community_60.snap on /snap/pycharm-community/60 type squashfs (ro,nodev,relatime)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,relatime)
/var/lib/snapd/snaps/pycharm-community_64.snap on /snap/pycharm-community/64 type squashfs (ro,nodev,relatime)
/dev/sda4 on /mnt/SSD2 type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
tmpfs on /run/user/1000 type tmpfs (rw,nosuid,nodev,relatime,size=808412k,mode=700,uid=1000,gid=1000)
gvfsd-fuse on /run/user/1000/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,relatime,user_id=1000,group_id=1000)

Output of sudo df -h command

~ » sudo df -h                                                                  
Filesystem      Size  Used Avail Use% Mounted on
udev            3.9G     0  3.9G   0% /dev
tmpfs           790M  9.3M  781M   2% /run
/dev/sda1        82G   75G  2.3G  98% /
tmpfs           3.9G  165M  3.7G   5% /dev/shm
tmpfs           5.0M  4.0K  5.0M   1% /run/lock
tmpfs           3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/loop0       87M   87M     0 100% /snap/core/4917
/dev/loop1       87M   87M     0 100% /snap/core/4650
/dev/loop2       87M   87M     0 100% /snap/core/4830
/dev/loop4      233M  233M     0 100% /snap/pycharm-community/62
/dev/loop3      240M  240M     0 100% /snap/pycharm-community/60
/dev/loop5      237M  237M     0 100% /snap/pycharm-community/64
/dev/sda4       136G  125G   11G  92% /mnt/SSD2
tmpfs           790M   28K  790M   1% /run/user/1000


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