seed: curriculum content

1.solar-system/1.welcome/13.the-saver/index.md

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+---
+type: challenge
+title: "The Saver"
+xp: 75
+duration: 25
+difficulty: 2
+---
+
+# The Saver
+
+> **[INCOMING — Mission Control, Earth]**
+>
+> Cadet, snapshots. Git's whole purpose is to capture *commits* —
+> snapshots of your work — that you can return to later.
+>
+> The flow per commit:
+>
+> 1. Create or modify a file
+> 2. `git add <file>` — stage it
+> 3. `git commit -m "<message>"` — lock it in
+>
+> When your script runs, a clean Git repo with identity already set
+> sits in the working directory. Make three commits, in this exact
+> order:
+>
+> 1. Create `a.txt` with `alpha`. Commit message: `add alpha`
+> 2. Create `b.txt` with `beta`.  Commit message: `add beta`
+> 3. Create `c.txt` with `gamma`. Commit message: `add gamma`
+>
+> [END TRANSMISSION]
+
+## Your Task
+
+In `starter/starter.sh`, run six commands per the flow above (one
+echo + add + commit per file).
+
+## Objectives
+
+- `a.txt`, `b.txt`, `c.txt` exist with `alpha`, `beta`, `gamma`
+- `git log` shows exactly 3 commits
+- Commit messages: `add alpha`, `add beta`, `add gamma` in order

1.solar-system/1.welcome/13.the-saver/starter/starter.sh

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+#!/bin/bash
+# The Saver — make three commits.
+#
+# When this script runs, a fresh Git repo with identity already set
+# is in your working directory. Make three commits, in this exact
+# order:
+#
+#   1. Create a.txt containing "alpha". Commit message: "add alpha"
+#   2. Create b.txt containing "beta".  Commit message: "add beta"
+#   3. Create c.txt containing "gamma". Commit message: "add gamma"
+#
+# Tools: echo, git add, git commit -m
+
+# Your code here.

1.solar-system/1.welcome/13.the-saver/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"
+
+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 a.txt ] && grep -q alpha a.txt 2>/dev/null; }; report $? "a.txt exists with 'alpha'"
+{ [ -f b.txt ] && grep -q beta  b.txt 2>/dev/null; }; report $? "b.txt exists with 'beta'"
+{ [ -f c.txt ] && grep -q gamma c.txt 2>/dev/null; }; report $? "c.txt exists with 'gamma'"
+
+COUNT=$(git log --oneline 2>/dev/null | wc -l | tr -d ' ')
+[ "$COUNT" = "3" ]; report $? "exactly 3 commits in git log"
+
+MSGS=$(git log --reverse --format='%s' 2>/dev/null)
+EXPECTED=$'add alpha\nadd beta\nadd gamma'
+[ "$MSGS" = "$EXPECTED" ]; report $? "commit messages: 'add alpha', 'add beta', 'add gamma' in order"