Add a check for minimal versions

Author: josephlr

.cirrus.yml

@@ -2,7 +2,12 @@ clippy_task:
     container:
         image: rust:latest
     component_script: rustup component add clippy
+    lockfile_script: cargo generate-lockfile
+    cargo_cache:
+        folder: $CARGO_HOME/registry
+        fingerprint_script: cat Cargo.lock
     clippy_script: cargo clippy
+    before_cache_script: rm -rf $CARGO_HOME/registry/index
 
 rustfmt_task:
     container:
@@ -21,9 +26,21 @@ linux_task:
       container:
         image: rustlang/rust:nightly
     keyutils_script: apt-get update && apt-get install libkeyutils-dev
+    lockfile_script: cargo generate-lockfile
     cargo_cache:
         folder: $CARGO_HOME/registry
         fingerprint_script: cat Cargo.lock
     build_script: cargo build
     test_script: cargo test
     before_cache_script: rm -rf $CARGO_HOME/registry/index
+
+minimal_version_task:
+    # We make sure we can build with the minimum specificed versions
+    container:
+        image: rustlang/rust:nightly
+    lockfile_script: cargo generate-lockfile -Z minimal-versions
+    cargo_cache:
+        folder: $CARGO_HOME/registry
+        fingerprint_script: cat Cargo.lock
+    build_script: cargo build
+    before_cache_script: rm -rf $CARGO_HOME/registry/index

Cargo.toml

@@ -14,10 +14,10 @@ edition = "2018"
 members = ["libkeyutils-sys"]
 
 [dependencies]
-bitflags = "1.0"
+bitflags = "1.0.4"
 errno = "0.2"
 itertools = "0.8"
 libkeyutils-sys = { path = "libkeyutils-sys" }
-log = "0.4"
+log = "0.4.4"
 
 libc = "0.2"