Simplified release process based on feedback

Previously, littlefs had mutable versions. That is, anytime a new commit
landed on master, the bot would update the most recent version to
contain the patch. The idea was that this would make sure users always
had the most recent bug fixes. Immutable snapshots could be accessed
through the git hashes.

However, at this point multiple developers have pointed out that this is
confusing, with mutable versions being non-standard and surprising.

This new release process adopts SemVer in its entirety, with
incrementing patch numbers and immutable versions.

When a new commit lands on master:
1. The major/minor version is taken from lfs.h
2. The most recent patch version is looked up on GitHub and incremented
3. A changelog is built out of the commits to the previous version
4. A new release is created on GitHub

Additionally, any commits that land while CI is still running are
coalesced together. Which means multiple PRs can land in a single
release.

.travis.yml

@@ -134,53 +134,44 @@ jobs:
         - STAGE=deploy
         - NAME=deploy
       script:
-        # Update tag for version defined in lfs.h
+        # Find version defined in lfs.h
         - LFS_VERSION=$(grep -ox '#define LFS_VERSION .*' lfs.h | cut -d ' ' -f3)
         - LFS_VERSION_MAJOR=$((0xffff & ($LFS_VERSION >> 16)))
         - LFS_VERSION_MINOR=$((0xffff & ($LFS_VERSION >>  0)))
-        - LFS_VERSION="v$LFS_VERSION_MAJOR.$LFS_VERSION_MINOR"
+        # Grab latests patch from repo tags, default to 0
-        - echo "littlefs version $LFS_VERSION"
+        - LFS_VERSION_PATCH=$(curl -f -u "$GEKY_BOT_RELEASES"
+                https://api.github.com/repos/$TRAVIS_REPO_SLUG/git/refs
+                | jq 'map(.ref | match(
+                    "refs/tags/v'"$LFS_VERSION_MAJOR"'\\.'"$LFS_VERSION_MINOR"'\\.(.*)$")
+                    .captures[].string | tonumber + 1) | max // 0')
+        # We have our new version
+        - LFS_VERSION="v$LFS_VERSION_MAJOR.$LFS_VERSION_MINOR.$LFS_VERSION_PATCH"
+        - echo "VERSION $LFS_VERSION"
         - |
-          curl -u $GEKY_BOT_RELEASES -X POST \
+          # Check that we're the most recent commit
-            https://api.github.com/repos/$TRAVIS_REPO_SLUG/git/refs \
+          CURRENT_COMMIT=$(curl -f -u "$GEKY_BOT_RELEASES" \
-            -d "{
+                https://api.github.com/repos/$TRAVIS_REPO_SLUG/commits/master \
-              \"ref\": \"refs/tags/$LFS_VERSION\",
+                | jq -re '.sha')
-              \"sha\": \"$TRAVIS_COMMIT\"
+          if [ "$TRAVIS_COMMIT" == "$CURRENT_COMMIT" ]
-            }"
-        - |
-          curl -f -u $GEKY_BOT_RELEASES -X PATCH \
-            https://api.github.com/repos/$TRAVIS_REPO_SLUG/git/refs/tags/$LFS_VERSION \
-            -d "{
-              \"sha\": \"$TRAVIS_COMMIT\"
-            }"
-        # Create release notes from commits
-        - LFS_PREV_VERSION="v$LFS_VERSION_MAJOR.$(($LFS_VERSION_MINOR-1))"
-        - |
-          if [ $(git tag -l "$LFS_PREV_VERSION") ]
           then
-            curl -u $GEKY_BOT_RELEASES -X POST \
+            # Build release notes
+            PREV=$(git tag --sort=-v:refname -l "v*.*.*" | head -1)
+            if [ ! -z "$PREV" ]
+            then
+                echo "PREV $PREV"
+                CHANGES=$'### Changes\n\n'$( \
+                    git log --oneline $PREV.. --grep='^Merge' --invert-grep)
+                printf "CHANGES\n%s\n\n" "$CHANGES"
+            fi
+            # Create the release
+            curl -f -u "$GEKY_BOT_RELEASES" -X POST \
                 https://api.github.com/repos/$TRAVIS_REPO_SLUG/releases \
                 -d "{
                     \"tag_name\": \"$LFS_VERSION\",
-                    \"name\": \"$LFS_VERSION\"
+                    \"target_commitish\": \"$TRAVIS_COMMIT\",
+                    \"name\": \"${LFS_VERSION%.0}\",
+                    \"body\": $(jq -sR '.' <<< "$CHANGES")
                 }"
-            RELEASE=$(
-                curl -f -u $GEKY_BOT_RELEASES \
-                    https://api.github.com/repos/$TRAVIS_REPO_SLUG/releases/tags/$LFS_VERSION
-            )
-            CHANGES=$(
-                git log --oneline $LFS_PREV_VERSION.. --grep='^Merge' --invert-grep
-            )
-            curl -f -u $GEKY_BOT_RELEASES -X PATCH \
-                https://api.github.com/repos/$TRAVIS_REPO_SLUG/releases/$(
-                    jq -r '.id' <<< "$RELEASE"
-                ) \
-                -d "$(
-                    jq -s '{
-                        "body": ((.[0] // "" | sub("(?<=\n)#+ Changes.*"; ""; "mi"))
-                            + "### Changes\n\n" + .[1])
-                    }' <(jq '.body' <<< "$RELEASE") <(jq -sR '.' <<< "$CHANGES")
-                )"
           fi
 
 # Manage statuses

LICENSE.md

@@ -22,3 +22,15 @@ LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+---
+
+*Note*:
+Individual files contain the following tag instead of the full license text.
+
+
+
+    SPDX-License-Identifier:    BSD-3-Clause
+
+This enables machine processing of license information based on the SPDX
+License Identifiers that are here available: http://spdx.org/licenses/

README.md

@@ -146,19 +146,6 @@ The tests assume a Linux environment and can be started with make:
 make test
 ```
 
-## License
-
-The littlefs is provided under the [BSD-3-Clause](https://spdx.org/licenses/BSD-3-Clause.html)
-license. See [LICENSE.md](LICENSE.md) for more information. Contributions to
-this project are accepted under the same license.
-
-Individual files contain the following tag instead of the full license text.
-
-    SPDX-License-Identifier:    BSD-3-Clause
-
-This enables machine processing of license information based on the SPDX
-License Identifiers that are here available: http://spdx.org/licenses/
-
 ## Related projects
 
 [Mbed OS](https://github.com/ARMmbed/mbed-os/tree/master/features/filesystem/littlefs) -