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15_File_Attributes

README.md

Chapter 15: File Attributes

Table of Contents

Exercise 15-1

Exercise 15-1 (a)

My answer is in Ex15_1A.md

Exercise 15-1 (b)

My answer is in Ex15_1B.md

Exercise 15-1 (c)

  1. Run make my_access
  2. Run ./ex15_1c.sh >results.md
  3. Results are in Ex15_1C.md

Exercise 15-2

My answer is in Ex15_2.md

Exercise 15-3

  1. Run make t_stat
  2. Run touch test
  3. Run ./t_stat test

Sample output is:

File type:                regular file
Device containing i-node: major=253   minor=1
I-node number:            51773935
Mode:                     100400 (r--------)
Number of (hard) links:   1
Ownership:                UID=1000   GID=1000
File size:                0 bytes
Optimal I/O block size:   4096 bytes
512B blocks allocated:    0
Last file access:         Thu Apr  1 08:26:36.752583228 2021
Last file modification:   Sun Mar 21 21:42:26.305140934 2021
Last status change:       Thu Apr  1 21:23:46.819378661 2021

Exercise 15-4

  1. Run make my_access
  2. Run sudo chown test_user my_access
  3. Run sudo chmod u+sx my_access
  4. Run touch test
  5. Run chmod 400 test
  6. Run ./my_access -f test
  7. Run ./my_access -r test
  8. Run ./my_access -w test

Sample output is:

$ ./my_access -f test
Access for uid to 'test' using mask 0 is 0 (Success)
seteuid(32767) failed: Operation not permitted
$ ./my_access -r test
Access for uid to 'test' using mask 4 is 0 (Success)
seteuid(32766) failed: Operation not permitted
$ ./my_access -w test
Access for uid to 'test' using mask 2 is -1 (Permission denied)
seteuid(32764) failed: Operation not permitted

Exercise 15-5

My answer is in EX_15_5.md

Exercise 15-6

  1. Run make chmod_arX
  2. Run ./chmod_arX.sh

Sample output is:

$ ./chmod_arX.sh
Before chmod a+rX...
d--------- 2 douglas douglas 4096 Apr 25 19:18 test_dir
---------- 1 douglas douglas    0 Apr 25 19:18 test_file
-rw-rw-r-x 1 douglas douglas    0 Apr 25 19:18 test_prog
After chmod a+rX...
dr-xr-xr-x 2 douglas douglas 4096 Apr 25 19:18 test_dir
-r--r--r-- 1 douglas douglas    0 Apr 25 19:18 test_file
-rwxrwxr-x 1 douglas douglas    0 Apr 25 19:18 test_prog

Exercise 15-7

  1. Create VM with extra LUNs
  2. Run make run_test_chattr

Tail of sample output is:

TASK [Run test program] *******************************************************************************
changed: [ol8-chattr]

TASK [Show errors from test] **************************************************************************
ok: [ol8-chattr] => {
    "run_test_chattr.stderr_lines": []
}

TASK [Show results of test] ***************************************************************************
ok: [ol8-chattr] => {
    "run_test_chattr.stdout_lines": []
}

PLAY RECAP ********************************************************************************************
ol8-chattr                 : ok=9    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0