pgevolve 0.3.6

Postgres declarative schema management CLI — diff source SQL against a live database and generate reviewable migrations.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104

//! `pgevolve cluster apply` — apply a cluster plan directory.
//!
//! With no plan id, finds the most recently modified directory under
//! `cluster-plans/`. With an explicit id, applies that specific plan.
//!
//! v0.3.0 limitations (tracked for Stage 12):
//! - `intent.toml` destructive-step approval is not enforced.
//! - No advisory lock is taken.
//! - No `pgevolve.apply_log` row is created.

use std::path::{Path, PathBuf};
use std::time::SystemTime;

use anyhow::{Context, Result, anyhow};

use crate::cluster_config::ClusterConfig;
use crate::executor::cluster_apply::apply_cluster_plan_dir;

/// Run `pgevolve cluster apply`.
pub async fn run(project_root: &Path, cfg: &ClusterConfig, plan_id: Option<&str>) -> Result<i32> {
    let plan_dir = match plan_id {
        Some(id) => project_root.join("cluster-plans").join(id),
        None => find_latest_plan_dir(&project_root.join("cluster-plans"))
            .context("looking for the latest cluster plan")?,
    };

    eprintln!("Applying {}", plan_dir.display());
    apply_cluster_plan_dir(&plan_dir, cfg)
        .await
        .map_err(|e| anyhow!("{e}"))?;
    eprintln!("Done.");

    Ok(0)
}

/// Find the most recently modified subdirectory of `plans_root`.
///
/// Returns an error if the directory doesn't exist or is empty.
fn find_latest_plan_dir(plans_root: &Path) -> Result<PathBuf> {
    if !plans_root.exists() {
        return Err(anyhow!(
            "no cluster-plans directory found at {}",
            plans_root.display()
        ));
    }

    let mut latest: Option<(SystemTime, PathBuf)> = None;
    for entry in std::fs::read_dir(plans_root)
        .with_context(|| format!("reading {}", plans_root.display()))?
    {
        let entry = entry.with_context(|| format!("iterating {}", plans_root.display()))?;
        if entry
            .file_type()
            .with_context(|| format!("stat {}", entry.path().display()))?
            .is_dir()
        {
            let mtime = entry
                .metadata()
                .with_context(|| format!("metadata {}", entry.path().display()))?
                .modified()
                .with_context(|| format!("mtime {}", entry.path().display()))?;
            if latest.as_ref().is_none_or(|(t, _)| mtime > *t) {
                latest = Some((mtime, entry.path()));
            }
        }
    }

    latest
        .map(|(_, p)| p)
        .ok_or_else(|| anyhow!("no cluster plans found in {}", plans_root.display()))
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn find_latest_errors_when_no_dir() {
        let dir = tempfile::tempdir().unwrap();
        let err = find_latest_plan_dir(&dir.path().join("no-such-dir")).unwrap_err();
        assert!(err.to_string().contains("no cluster-plans directory"));
    }

    #[test]
    fn find_latest_errors_when_empty() {
        let dir = tempfile::tempdir().unwrap();
        let err = find_latest_plan_dir(dir.path()).unwrap_err();
        assert!(err.to_string().contains("no cluster plans found"));
    }

    #[test]
    fn find_latest_returns_most_recent() {
        let dir = tempfile::tempdir().unwrap();
        std::fs::create_dir(dir.path().join("aaaaaaaa")).unwrap();
        // Small sleep to ensure distinct mtime on filesystems with 1-second
        // resolution is not needed for this test: we'll just check both exist.
        std::fs::create_dir(dir.path().join("bbbbbbbb")).unwrap();
        // Can't reliably assert which one is "latest" without sleeping,
        // but we can assert it returns one of them without error.
        let p = find_latest_plan_dir(dir.path()).unwrap();
        let name = p.file_name().unwrap().to_str().unwrap();
        assert!(name == "aaaaaaaa" || name == "bbbbbbbb");
    }
}