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Attempt to use reflinks by default on Linux #17753

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zanieb wants to merge 4 commits into from
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Attempt to use reflinks by default on Linux #17753

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1bb1c58
Fallback to hardlink after reflink failure before copying
zanieb Feb 19, 2026
d72f1ca
Default to clone (reflink) link mode on Linux
claude Jan 30, 2026
3da3164
Add cross-filesystem link tests with dedicated test env vars
zanieb Feb 19, 2026
44dd020
Review
zanieb Feb 19, 2026
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29 changes: 29 additions & 0 deletions .github/workflows/test.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -60,6 +60,21 @@ jobs:
# the login password doesn't matter, but the keyring must be unlocked for the tests to work
run: gnome-keyring-daemon --components=secrets --daemonize --unlock <<< 'foobar'

- name: "Create btrfs filesystem"
run: |
sudo apt-get install -y btrfs-progs
truncate -s 1G /tmp/btrfs.img
mkfs.btrfs /tmp/btrfs.img
sudo mkdir /btrfs
sudo mount -o loop /tmp/btrfs.img /btrfs
sudo chown "$(id -u):$(id -g)" /btrfs

- name: "Create tmpfs filesystem"
run: |
sudo mkdir /tmpfs
sudo mount -t tmpfs -o size=256m tmpfs /tmpfs
sudo chown "$(id -u):$(id -g)" /tmpfs

- name: "Install cargo nextest"
uses: taiki-e/install-action@542cebaaed782771e619bd5609d97659d109c492 # v2.66.7
with:
Expand All @@ -70,6 +85,9 @@ jobs:
# Retry more than default to reduce flakes in CI
UV_HTTP_RETRIES: 5
RUST_BACKTRACE: 1
UV_INTERNAL__TEST_COW_FS: /btrfs
UV_INTERNAL__TEST_NOCOW_FS: /tmpfs
UV_INTERNAL__TEST_ALT_FS: /tmpfs
run: |
cargo nextest run \
--cargo-profile fast-build \
Expand Down Expand Up @@ -97,6 +115,12 @@ jobs:
- name: "Install Rust toolchain"
run: rustup show

- name: "Create HFS+ RAM disk (no reflink support)"
run: |
RAMDISK=$(hdiutil attach -nomount ram://524288 | xargs)
diskutil eraseDisk HFS+ NoReflink "$RAMDISK"
echo "HFS_MOUNT=/Volumes/NoReflink" >> "$GITHUB_ENV"

- uses: astral-sh/setup-uv@eac588ad8def6316056a12d4907a9d4d84ff7a3b # v7.3.0
with:
version: "0.10.2"
Expand All @@ -114,6 +138,11 @@ jobs:
# Retry more than default to reduce flakes in CI
UV_HTTP_RETRIES: 5
RUST_BACKTRACE: 1
# macOS tmpdir is on APFS which supports reflink
UV_INTERNAL__TEST_COW_FS: ${{ runner.temp }}
# HFS+ RAM disk does not support copy-on-write and is on a different device
UV_INTERNAL__TEST_NOCOW_FS: ${{ env.HFS_MOUNT }}
UV_INTERNAL__TEST_ALT_FS: ${{ env.HFS_MOUNT }}
run: |
cargo nextest run \
--cargo-profile fast-build \
Expand Down
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