add sanity checks for user write access on x install

[onur-ozkan]

Resolves #113580

[rustbot]

r? @Mark-Simulacrum

(rustbot has picked a reviewer for you, use r? to override)

[Mark-Simulacrum]

@bors r+

[bors]

📌 Commit 350ead8 has been approved by Mark-Simulacrum

It is now in the queue for this repository.

[bors]

⌛ Testing commit 350ead8 with merge bb6c66b...

[bors]

☀️ Test successful - checks-actions
Approved by: Mark-Simulacrum
Pushing bb6c66b to master...

[rust-timer]

Finished benchmarking commit (bb6c66b): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	2.0%	[1.2%, 3.7%]	3
Improvements ✅ (primary)	-3.1%	[-3.1%, -3.1%]	1
Improvements ✅ (secondary)	-0.8%	[-0.8%, -0.8%]	1
All ❌✅ (primary)	-3.1%	[-3.1%, -3.1%]	1

Cycles

This benchmark run did not return any relevant results for this metric.

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 630.982s -> 631.709s (0.12%)
Artifact size: 317.32 MiB -> 317.40 MiB (0.02%)

[tmandry]

This PR breaks builds where the sysconfdir isn't explicitly created before running the build. Before this PR the directory would be created if it didn't exist.