Bug: 109748616
Test: ./updater.sh check kotlinc googletest --json_output=/tmp/res.json
Test: out/soong/host/linux-x86/bin/external_updater_notifier \
          --result_file=/tmp/res.json \
          --history ~/updater/history \
          --recipients=hhb@google.com

Change-Id: I27a4c1c2604d38106a08ce3eee1bcd03fdce80d7

If the version in METADATA is a commit (sha1), the tool will try to
download the latest master from github, instead of latest release.

Test: update METADATA of androidplot and try to update.
Change-Id: Id12b797ca152f11d16c4d06c44e30758bec40f24

This change computes edit distant between old url and each of new urls.
And use the url most like previous one.

Test: update any library
Change-Id: I959a22168652c7543da2cdb29d36a1d061ade7e9

Bail out as soon as something goes wrong. Previously if we failed early,
we'd obliterate the existing version anyway.

Don't remove the temporary directory on failure. Otherwise there's no
way to debug a failure.

Bug: N/A
Test: updated external/curl
Change-Id: I3bf055a8ec514c7b76683baee8e1540deb5a3e5d

Add the support to check how far a project is behind upstream git.

Still need to manually run git merge. But this tool can help update
METADATA. :)

Test: ./updater.sh update perf_data_converter
Change-Id: Ic46a0eb723ae22f0fc7d61a67a14299761b564a4

Bug: 109748616
Test: https://android-review.googlesource.com/c/platform/external/kotlinc/+/699886
Change-Id: I1c28aa256bca6ee5be1ea15f295c5e0fa63526d1