RPM Specs argument handling
When building RPM’s it is possible to use post and pre install/uninstall hooks. These get sometimes some parameters to determine if you are upgrading or uninstalling. This could be handy when creating users while installing. So it is crucial to know these and I always forget them
| install | upgrade | uninstall | |
| %pretrans | $1 == 0 | $1 == 0 | (N/A) |
| %pre | $1 == 1 | $1 == 2 | (N/A) |
| %post | $1 == 1 | $1 == 2 | (N/A) |
| %preun | (N/A) | $1 == 1 | $1 == 0 |
| %postun | (N/A) | $1 == 1 | $1 == 0 |
| %posttrans | $1 == 0 | $1 == 0 | (N/A) |