BlissRoms/Build Tips

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Here's a collective list of things you can try to improve your builds. Have fun!

repo optimization tips


By default, repo only utilizes four threads (or whatever the ROM manifest declares.) If you have a stronger machine with more threads, you can increase this number. For example, to use 8 threads:

repo sync -j8

To use all of the threads on your machine, use:

repo sync -j$(nproc --all)

Current branch only

This is usually set by default in your ROM manifest, but just in case, you can tell repo to only fetch the branch you want to work on:

repo sync -c

Current history only

To only download the most recent changes, use this flag:

repo sync --depth=1

This will make repo fetch the most recent changes.

Minimal fetch

To disable syncing clone bundles and tags, use:

repo sync --no-clone-bundle --no-tags

repo uses git bundles over HTTP to download repositories. To disable this behavior, we use the --no-clone-bundle flag. We also don't need all of the git tags in each repository, so we disable that too with --no-tags.

Force sync

Sometimes, bad Internet conditions may cause your .repo directory to become corrupt and not sync. repo keeps two copies of a repository - one under .repo, and one in the root of your source directory. If the repository in .repo is corrupted, it will not sync over to the source directory.

To resolve this problem, you need to sometimes tell repo to forcefully sync the repository in .repo again with the remote repository so that changes can be synced over to the main source tree. Use the --force-sync flag to achieve this:

repo sync --force-sync
Why not use -f as well?

Starting from repo 1.26, the use of the flags -f and --force-sync together has been deprecated. repo will warn you of this change if you try and use those two flags together. To make sure your scripts do not break in future repo versions, it is recommended to not use the -f flag at all.

Optimize fetch

To fetch projects that are fixed to a SHA1 revision and do not exist locally, use the --optimized-fetch flag to achieve this:

repo sync --optimized-fetch

Prune repository list

To remove references that no longer exist on the remote end, use the --prune flag to achieve this:

repo sync --prune

reposync alias

repo sync -c -j$(nproc --all) --no-clone-bundle --no-tags --optimized-fetch --prune

That's quite long! How about we add this to our .bashrc as a alias? That way, we only have to type one phrase for bash to automatically type that out for us.

Open up ~/.bashrc and add these lines:

# Alias to sync
alias reposync='repo sync -c -j$(nproc --all) --no-clone-bundle --no-tags --optimized-fetch --prune'

This way, next time you want to sync, just type reposync and bash will substitute the command for you. Easy! Just don't forget to source ~/.bashrc otherwise bash will not know of this new alias.

Delete device trees and local manifests

WARNING: If you have any changes in your device trees, commit them and push them to a remote repository. This tip will permanently delete your local changes, so back them up!

While messing around with device specific folders, you may break something and the build process might not work. Or, you may have multiple devices synced and you want to delete it all and start over. This tip/command will let you delete only the device trees.

Add this function to your ~/.bashrc:

# Remove all device trees/local manifests
function resettree() {
    rm -rf device kernel vendor out .repo/local_manifests

Let's go over what this does, word by word:

  • rm -rf: Destructive command to erase all of the following:
  • device folder: Holds all device-related files
  • kernel folder: Holds all kernel-related files for devices
  • vendor folder: Holds all vendor-related files for devices AND ROM-specific vendor customizations
  • out folder: Stores artifacts of builds
  • .repo/local_manifests folder: Stores "manifest" information of devices to sync.
  • reposync: Executes the repo sync alias we made earlier.

The last line is important, because by deleting the vendor folder, we also delete some crucial files for building Bliss. To fix that, we rerun a sync. Note that because we did not delete any other folders, syncing and updating files only take a fraction of a time compared to starting from scratch.

After running resettree, make sure to initialize a new tree by running breakfast <devicename>.

GitHub cherry-pick

Thanks to @blueyes for providing the script!

Copy the following into your ~/.bashrc:

function gcp() {
    COMMIT=`echo "$1" | cut -d/ -f6`
    GH=`echo "$1" | cut -d/ -f1-3`
    if [ "$COMMIT" != "commit" ]; then
        echo -e "Please use a commit URL."
    elif [ "$GH" != "" ]; then
        echo -e "Please use an URL."
        PROJECT=`echo "$1" | cut -d/ -f1-5`
        git fetch $PROJECT
        CP=`echo "$1" | cut -d/ -f7`
        git cherry-pick $CP

To use this, source ~/.bashrc and then run gcp <GitHub commit URL here>.