15900: Report stable gem version for a given commit.

[arvados.git] / build / version-at-commit.sh

diff --git a/build/version-at-commit.sh b/build/version-at-commit.sh
new file mode 100755 (executable)
index 0000000..2f514c8
--- /dev/null
+++ b/build/version-at-commit.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+
+set -e -o pipefail
+commit="$1"
+versionglob="[0-9].[0-9]*.[0-9]*"
+
+if ! git describe --exact-match --match "$versionglob" "$commit" 2>/dev/null; then
+    if git merge-base --is-ancestor "$commit" origin/master; then
+        # x.(y+1).0.preTIMESTAMP, where x.y.z is the newest version that does not contain $commit
+        v=$(git tag | grep -vFf <(git tag --contains "$commit") | sort -Vr | head -n1 | perl -pe 's/\.(\d+)\.\d+/".".($1+1).".0"/e')
+    else
+        # x.y.(z+1).preTIMESTAMP, where x.y.z is the latest released ancestor of $commit
+        v=$(git describe --abbrev=0 --match "$versionglob" "$commit" | perl -pe 's/(\d+)$/$1+1/e')
+    fi
+    ts=$(TZ=UTC git log -n1 --format=%cd --date="format-local:%Y%m%d%H%M%S" "$commit")
+    echo "$v.pre$ts"
+fi