Ok, thank you. That resolved the error. I mistakenly guessed that I had to list files specifically, but for a system-backup, I could see where that doesn’t makes sense.
EDIT: I failed to notice that my second command actually worked. So it looks like this approach will work for me.
Now I need to add information to the man page to explain how to use it.
Thanks!
root@kinetic:~/Projects/tools/mincore# ls -l /var/lib/mysql/ibdata1
-rw-r----- 1 mysql mysql 12582912 Jun 8 06:52 /var/lib/mysql/ibdata1
root@kinetic:~/Projects/tools/mincore# snap connections mincore
Interface Plug Slot Notes
physical-memory-observe mincore:physical-memory-observe - -
system-backup mincore:system-backup :system-backup manual
system-observe mincore:system-observe - -
root@kinetic:~/Projects/tools/mincore# mincore /var/lib/mysql/ibdata1
pages pages not %
in core in core in file
---------- ---------- ---- --------------------
- /var/lib/mysql/ibdata1: No such file or directory
---------- ---------- ---- --------------------
0 0 0 total pages
0.0 0.0 total MB (4kb pages)
root@kinetic:~/Projects/tools/mincore# mincore /var/lib/snapd/hostfs/var/lib/mysql/ibdata1
pages pages not %
in core in core in file
---------- ---------- ---- --------------------
3072 0 100 /var/lib/snapd/hostfs/var/lib/mysql/ibdata1
---------- ---------- ---- --------------------
3072 0 100 total pages
12.0 0.0 total MB (4kb pages)
root@kinetic:~/Projects/tools/mincore#