Zola Panics With a Non-Existent Project Root or Config

[ElliotKillick]

Bug Report

Environment

Zola version: 0.17.2

Expected Behavior

No panic, an error message is printed and Zola exits cleanly.

Current Behavior

Panic.

RUST_BACKTRACE=full ~/Downloads/zola-v0.17.2-x86_64-unknown-linux-gnu/zola -r I_DO_NOT_EXIST build
thread 'main' panicked at 'Could not find canonical path of root dir: I_DO_NOT_EXIST', src/main.rs:32:9
stack backtrace:
   0:     0x64e37e48e1ac - <unknown>
   1:     0x64e37dd5d91e - <unknown>
   2:     0x64e37e464034 - <unknown>
   3:     0x64e37e48f96f - <unknown>
   4:     0x64e37e48f56f - <unknown>
   5:     0x64e37e49060c - <unknown>
   6:     0x64e37e4900c4 - <unknown>
   7:     0x64e37e49002c - <unknown>
   8:     0x64e37e490001 - <unknown>
   9:     0x64e37dad45d2 - <unknown>
  10:     0x64e37dbc3936 - <unknown>
  11:     0x64e37db64413 - <unknown>
  12:     0x64e37dbd19d9 - <unknown>
  13:     0x7136f5b7eb4a - __libc_start_call_main
  14:     0x7136f5b7ec0b - __libc_start_main@@GLIBC_2.34
  15:     0x64e37db38aae - <unknown>
  16:                0x0 - <unknown>

Step to reproduce

zola -r I_DO_NOT_EXIST build

Same error happens with most other commands (e.g. init).

[ElliotKillick]

Here's another similar one:

RUST_BACKTRACE=full ~/Downloads/zola-v0.17.2-x86_64-unknown-linux-gnu/zola -c I_DO_NOT_EXIST build
Building site...
thread 'main' panicked at 'could not find directory containing config file', src/main.rs:19:28
stack backtrace:
   0:     0x5738e70271ac - <unknown>
   1:     0x5738e68f691e - <unknown>
   2:     0x5738e6ffd034 - <unknown>
   3:     0x5738e702896f - <unknown>
   4:     0x5738e702856f - <unknown>
   5:     0x5738e702960c - <unknown>
   6:     0x5738e6704699 - <unknown>
   7:     0x5738e66fb61c - <unknown>
   8:     0x5738e665e19a - <unknown>
   9:     0x5738e67592fe - <unknown>
  10:     0x5738e6759c81 - <unknown>
  11:     0x5738e66fd413 - <unknown>
  12:     0x5738e676a9d9 - <unknown>
  13:     0x7b26b372ab4a - __libc_start_call_main
  14:     0x7b26b372ac0b - __libc_start_main@@GLIBC_2.34
  15:     0x5738e66d1aae - <unknown>
  16:                0x0 - <unknown>

[Keats]

We should error instead of panicking here: https://github.com/getzola/zola/blob/master/src/main.rs#L15-L33

[Raymi306]

this was partially fixed on next already, I will fix the other panic indicated by Keats and make a new PR