seed: curriculum content

1.solar-system/1.welcome/14.the-historian/index.md

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+---
+type: challenge
+title: "The Historian"
+xp: 75
+duration: 25
+difficulty: 3
+---
+
+# The Historian
+
+> **[INCOMING — Mission Control, Earth]**
+>
+> Cadet, the repo in your working directory contains five commits
+> from a previous mission. We need a historian's eye on it.
+>
+> Two commands today:
+>
+> - `git log --oneline` — compact one-line-per-commit history
+> - `git show <hash>` — show what a commit changed
+>
+> Your script must produce two files:
+>
+> 1. `log.txt` — full one-line log
+> 2. `breach-commit.txt` — short hash of the commit whose message
+>    mentions `BREACH`
+>
+> Hint: pipe the log through `grep BREACH | awk '{print $1}'` to
+> extract the short hash from the matching line.
+>
+> [END TRANSMISSION]
+
+## Your Task
+
+In `starter/starter.sh`, capture the full log and the breach commit's
+short hash.
+
+## Objectives
+
+- `log.txt` lists all 5 commits, one per line
+- `breach-commit.txt` contains the short hash of the BREACH commit

1.solar-system/1.welcome/14.the-historian/starter/starter.sh

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+#!/bin/bash
+# The Historian — read git history.
+#
+# When this script runs, the current Git repo already has 5 commits
+# from a prior mission. One of them mentions BREACH.
+#
+# Your script must produce two files:
+#   - log.txt           — `git log --oneline` output (one line per commit)
+#   - breach-commit.txt — the short hash of the BREACH commit
+#
+# Hint: `git log --oneline | grep BREACH | awk '{print $1}'`
+# pipes the matching log line and prints the leftmost column (the
+# short hash).
+
+# Your code here.

1.solar-system/1.welcome/14.the-historian/testing/test.sh

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+#!/bin/bash
+git init -q -b main
+git config user.name "Setup"
+git config user.email "setup@learnroom.local"
+
+echo "manifest"           > manifest.txt;   git add manifest.txt;   git commit -q -m "add manifest"
+echo "sensor a online"    > sensor-a.txt;   git add sensor-a.txt;   git commit -q -m "add sensor A"
+echo "breach details"     > breach.txt;     git add breach.txt;     git commit -q -m "investigate BREACH at sector C"
+echo "sensor b online"    > sensor-b.txt;   git add sensor-b.txt;   git commit -q -m "add sensor B"
+echo "resolution applied" > resolution.txt; git add resolution.txt; git commit -q -m "apply resolution"
+
+bash solution.sh > /dev/null 2>&1
+
+N=0
+report() { N=$((N+1)); if [ "$1" = "0" ]; then echo "ok $N - $2"; else echo "not ok $N - $2"; fi; }
+
+[ -f log.txt ]; report $? "log.txt exists"
+LINES=$(wc -l < log.txt | tr -d ' ')
+[ "$LINES" = "5" ]; report $? "log.txt has 5 lines (one per commit)"
+
+[ -f breach-commit.txt ]; report $? "breach-commit.txt exists"
+ACTUAL=$(tr -d '[:space:]' < breach-commit.txt 2>/dev/null)
+EXPECTED=$(git log --grep BREACH --format=%h)
+[ "$ACTUAL" = "$EXPECTED" ]; report $? "breach-commit.txt contains the BREACH commit's short hash"