mirror of
https://github.com/NixOS/nix
synced 2024-09-20 23:28:26 -04:00
46 lines
1.3 KiB
Nix
46 lines
1.3 KiB
Nix
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{
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description = "fetchTree fetches git repos shallowly by default";
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script = ''
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# purge nix git cache to make sure we start with a clean slate
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client.succeed("rm -rf ~/.cache/nix")
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# add two commits to the repo:
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# - one with a large file (2M)
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# - another one making the file small again
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client.succeed(f"""
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dd if=/dev/urandom of={repo.path}/thailand bs=1M count=2 \
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&& {repo.git} add thailand \
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&& {repo.git} commit -m 'commit1' \
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&& echo 'ThaigerSprint' > {repo.path}/thailand \
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&& {repo.git} add thailand \
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&& {repo.git} commit -m 'commit2' \
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&& {repo.git} push origin main
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""")
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# memoize the revision
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commit2_rev = client.succeed(f"""
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{repo.git} rev-parse HEAD
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""").strip()
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# construct the fetcher call
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fetchGit_expr = f"""
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builtins.fetchTree {{
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type = "git";
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url = "{repo.remote}";
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rev = "{commit2_rev}";
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}}
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"""
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# fetch the repo via nix
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fetched1 = client.succeed(f"""
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nix eval --impure --raw --expr '({fetchGit_expr}).outPath'
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""")
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# check that the size of ~/.cache/nix is less than 1M
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cache_size = client.succeed("""
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du -s ~/.cache/nix
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""").strip().split()[0]
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assert int(cache_size) < 1024, f"cache size is {cache_size}K which is larger than 1M"
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'';
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}
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