I wrote this to help with updating tags incrementally e.g. 1.0.1 to 1.0.2 etc.
2020 update: I have posted an improved version beneath/here. (Also worth seeing @Geoffrey's answer below for some comments on branching).
#!/bin/bash
#get highest tag number
VERSION=`git describe --abbrev=0 --tags`
#replace . with space so can split into an array
VERSION_BITS=(${VERSION//./ })
#get number parts and increase last one by 1
VNUM1=${VERSION_BITS[0]}
VNUM2=${VERSION_BITS[1]}
VNUM3=${VERSION_BITS[2]}
VNUM3=$((VNUM3+1))
#create new tag
NEW_TAG="$VNUM1.$VNUM2.$VNUM3"
echo "Updating $VERSION to $NEW_TAG"
#get current hash and see if it already has a tag
GIT_COMMIT=`git rev-parse HEAD`
NEEDS_TAG=`git describe --contains $GIT_COMMIT 2>/dev/null`
#only tag if no tag already
if [ -z "$NEEDS_TAG" ]; then
git tag $NEW_TAG
echo "Tagged with $NEW_TAG"
git push --tags
else
echo "Already a tag on this commit"
fi
I revisit this 6 years later needing to write a similar script for uploading to npm. Code below or here, comments and suggestions appreciated and welcome:
#!/bin/bash
# https://github.com/unegma/bash-functions/blob/main/update.sh
VERSION=""
#get parameters
while getopts v: flag
do
case "${flag}" in
v) VERSION=${OPTARG};;
esac
done
#get highest tag number, and add 1.0.0 if doesn't exist
CURRENT_VERSION=`git describe --abbrev=0 --tags 2>/dev/null`
if [[ $CURRENT_VERSION == '' ]]
then
CURRENT_VERSION='1.0.0'
fi
echo "Current Version: $CURRENT_VERSION"
#replace . with space so can split into an array
CURRENT_VERSION_PARTS=(${CURRENT_VERSION//./ })
#get number parts
VNUM1=${CURRENT_VERSION_PARTS[0]}
VNUM2=${CURRENT_VERSION_PARTS[1]}
VNUM3=${CURRENT_VERSION_PARTS[2]}
if [[ $VERSION == 'major' ]]
then
VNUM1=$((VNUM1+1))
elif [[ $VERSION == 'minor' ]]
then
VNUM2=$((VNUM2+1))
elif [[ $VERSION == 'patch' ]]
then
VNUM3=$((VNUM3+1))
else
echo "No version type (https://semver.org/) or incorrect type specified, try: -v [major, minor, patch]"
exit 1
fi
#create new tag
NEW_TAG="$VNUM1.$VNUM2.$VNUM3"
echo "($VERSION) updating $CURRENT_VERSION to $NEW_TAG"
#get current hash and see if it already has a tag
GIT_COMMIT=`git rev-parse HEAD`
NEEDS_TAG=`git describe --contains $GIT_COMMIT 2>/dev/null`
#only tag if no tag already
#to publish, need to be logged in to npm, and with clean working directory: `npm login; git stash`
if [ -z "$NEEDS_TAG" ]; then
npm version $NEW_TAG
npm publish --access public
echo "Tagged with $NEW_TAG"
git push --tags
git push
else
echo "Already a tag on this commit"
fi
exit 0
Subnote: this won't work with zsh as (for one), zsh doesn't use 0 indexed arrays.
git push? – Chromatin