Reimplement sudo-exec

[pvdrz]

Even though this PR fixes some of the shortcomings of the current sudo-exec crate, the size of it is quite extensive, making it challenging to review.

I think it would be better to break down this PR into smaller, more manageable PRs. With that in mind, I consider we should leave this PR open in draft status as a reference meanwhile.

[github-actions]

Number of dependencies and binary size impact report

Metric	main	PR #363	Delta
Direct dependencies	8	8	-
Total dependencies	85	87	+2.4%
Binary size	989 KiB	1 MiB	+8.2%
Text size	566.2 KiB	609.6 KiB	+7.7%

Dependencies diff

 └─ sudo [v0.1.0-alpha.1]
    ├─ sudo-cli [v0.1.0-alpha.1]
    ├─ sudo-common [v0.1.0-alpha.1]
    |  ├─ libc [v0.2.144]
    |  ├─ sudo-cli [v0.1.0-alpha.1]
    |  ├─ sudo-pam [v0.1.0-alpha.1]
    |  |  ├─ libc [v0.2.144]
    |  |  ├─ sudo-cutils [v0.1.0-alpha.1]
    |  |  |  └─ libc [v0.2.144]
    |  |  └─ sudo-pam-sys [v0.1.0-alpha.1]
    |  |     ├─ libc [v0.2.144]
    |  |     └─ bindgen [v0.63.0]
    |  |        ├─ bitflags [v1.3.2]
    |  |        ├─ cexpr [v0.6.0]
    |  |        |  └─ nom [v7.1.3]
    |  |        |     ├─ memchr [v2.5.0]
    |  |        |     └─ minimal-lexical [v0.2.1]
    |  |        ├─ clang-sys [v1.6.1]
    |  |        |  ├─ glob [v0.3.1]
    |  |        |  ├─ libc [v0.2.144]
    |  |        |  ├─ libloading [v0.7.4]
    |  |        |  |  └─ cfg-if [v1.0.0]
    |  |        |  └─ glob [v0.3.1]
    |  |        ├─ lazy_static [v1.4.0]
    |  |        ├─ lazycell [v1.3.0]
    |  |        ├─ log [v0.4.17]
    |  |        |  └─ cfg-if [v1.0.0]
    |  |        ├─ peeking_take_while [v0.1.2]
    |  |        ├─ proc-macro2 [v1.0.57]
    |  |        |  └─ unicode-ident [v1.0.8]
    |  |        ├─ quote [v1.0.27]
    |  |        |  └─ proc-macro2 [v1.0.57]
    |  |        ├─ regex [v1.8.1]
    |  |        |  └─ regex-syntax [v0.7.1]
    |  |        ├─ rustc-hash [v1.1.0]
    |  |        ├─ shlex [v1.1.0]
    |  |        ├─ syn [v1.0.109]
    |  |        |  ├─ proc-macro2 [v1.0.57]
    |  |        |  ├─ quote [v1.0.27]
    |  |        |  └─ unicode-ident [v1.0.8]
    |  |        └─ which [v4.4.0]
    |  |           ├─ either [v1.8.1]
    |  |           └─ libc [v0.2.144]
    |  └─ sudo-system [v0.1.0-alpha.1]
    |     ├─ libc [v0.2.144]
 
+    |     ├─ signal-hook [v0.3.15]
+    |     |  ├─ libc [v0.2.144]
+    |     |  ├─ signal-hook-registry [v1.4.1]
+    |     |  |  └─ libc [v0.2.144]
+    |     |  └─ cc [v1.0.79]
+    |     ├─ signal-hook-registry [v1.4.1]
+ 
    |     ├─ sudo-cutils [v0.1.0-alpha.1]
    |     └─ sudo-log [v0.1.0-alpha.1]
    |        ├─ env_logger [v0.9.3]
    |        |  └─ log [v0.4.17]
    |        |     └─ cfg-if [v1.0.0]
    |        ├─ log [v0.4.17]
    |        └─ syslog [v6.1.0]
    |           ├─ error-chain [v0.12.4]
    |           |  └─ version_check [v0.9.4]
    |           ├─ hostname [v0.3.1]
    |           |  ├─ libc [v0.2.144]
    |           |  └─ match_cfg [v0.1.0]
    |           ├─ libc [v0.2.144]
    |           ├─ log [v0.4.17]
    |           └─ time [v0.3.21]
    |              ├─ itoa [v1.0.6]
    |              ├─ libc [v0.2.144]
    |              ├─ num_threads [v0.1.6]
    |              └─ time-core [v0.1.1]
    ├─ sudo-env [v0.1.0-alpha.1]
    |  ├─ sudo-common [v0.1.0-alpha.1]
    |  ├─ sudo-system [v0.1.0-alpha.1]
    |  └─ sudoers [v0.1.0-alpha.1]
    |     ├─ glob [v0.3.1]
    |     ├─ sudo-defaults [v0.1.0-alpha.1]
    |     ├─ sudo-log [v0.1.0-alpha.1]
    |     └─ sudo-system [v0.1.0-alpha.1]
    ├─ sudo-exec [v0.1.0-alpha.1]
    |  ├─ signal-hook [v0.3.15]
 
-    |  |  ├─ libc [v0.2.144]
-    |  |  ├─ signal-hook-registry [v1.4.1]
-    |  |  |  └─ libc [v0.2.144]
-    |  |  └─ cc [v1.0.79]
- 
    |  ├─ sudo-common [v0.1.0-alpha.1]
    |  ├─ sudo-log [v0.1.0-alpha.1]
    |  └─ sudo-system [v0.1.0-alpha.1]
    ├─ sudo-log [v0.1.0-alpha.1]
    ├─ sudo-pam [v0.1.0-alpha.1]
    ├─ sudo-system [v0.1.0-alpha.1]
    └─ sudoers [v0.1.0-alpha.1]

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.08 🎉

Comparison is base (affd48c) 74.55% compared to head (431f050) 74.64%.

❗ Current head 431f050 differs from pull request most recent head ed07e90. Consider uploading reports for the commit ed07e90 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #363      +/-   ##
==========================================
+ Coverage   74.55%   74.64%   +0.08%     
==========================================
  Files          42       39       -3     
  Lines        5325     4898     -427     
==========================================
- Hits         3970     3656     -314     
+ Misses       1355     1242     -113     

Impacted Files	Coverage Δ
lib/sudo-exec/src/lib.rs	1.20% <ø> (ø)
lib/sudo-exec/src/monitor.rs	0.00% <0.00%> (ø)
lib/sudo-system/src/lib.rs	71.42% <0.00%> (-0.72%)	⬇️

... and 14 files with indirect coverage changes

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[pvdrz]

Closed in favor of #520 and friends