#!/bin/sh
#
# Copyright (c) 2005 Amos Waterland
# Copyright (c) 2006 Christian Couder
#

test_description='git pack-refs should not change the branch semantic

This test runs git pack-refs and git show-ref and checks that the branch
semantic is still the same.
'
. ./test-lib.sh

test_expect_success 'enable reflogs' '
        git config core.logallrefupdates true
'

test_expect_success \
    'prepare a trivial repository' \
    'echo Hello > A &&
     git update-index --add A &&
     git commit -m "Initial commit." &&
     HEAD=$(git rev-parse --verify HEAD)'

SHA1=

test_expect_success \
    'see if git show-ref works as expected' \
    'git branch a &&
     SHA1=`cat .git/refs/heads/a` &&
     echo "$SHA1 refs/heads/a" >expect &&
     git show-ref a >result &&
     test_cmp expect result'

test_expect_success \
    'see if a branch still exists when packed' \
    'git branch b &&
     git pack-refs --all &&
     rm -f .git/refs/heads/b &&
     echo "$SHA1 refs/heads/b" >expect &&
     git show-ref b >result &&
     test_cmp expect result'

test_expect_success 'git branch c/d should barf if branch c exists' '
     git branch c &&
     git pack-refs --all &&
     rm -f .git/refs/heads/c &&
     test_must_fail git branch c/d
'

test_expect_success \
    'see if a branch still exists after git pack-refs --prune' \
    'git branch e &&
     git pack-refs --all --prune &&
     echo "$SHA1 refs/heads/e" >expect &&
     git show-ref e >result &&
     test_cmp expect result'

test_expect_success 'see if git pack-refs --prune remove ref files' '
     git branch f &&
     git pack-refs --all --prune &&
     ! test -f .git/refs/heads/f
'

test_expect_success 'see if git pack-refs --prune removes empty dirs' '
     git branch r/s/t &&
     git pack-refs --all --prune &&
     ! test -e .git/refs/heads/r
'

test_expect_success \
    'git branch g should work when git branch g/h has been deleted' \
    'git branch g/h &&
     git pack-refs --all --prune &&
     git branch -d g/h &&
     git branch g &&
     git pack-refs --all &&
     git branch -d g'

test_expect_success 'git branch i/j/k should barf if branch i exists' '
     git branch i &&
     git pack-refs --all --prune &&
     test_must_fail git branch i/j/k
'

test_expect_success \
    'test git branch k after branch k/l/m and k/lm have been deleted' \
    'git branch k/l &&
     git branch k/lm &&
     git branch -d k/l &&
     git branch k/l/m &&
     git branch -d k/l/m &&
     git branch -d k/lm &&
     git branch k'

test_expect_success \
    'test git branch n after some branch deletion and pruning' \
    'git branch n/o &&
     git branch n/op &&
     git branch -d n/o &&
     git branch n/o/p &&
     git branch -d n/op &&
     git pack-refs --all --prune &&
     git branch -d n/o/p &&
     git branch n'

test_expect_success \
        'see if up-to-date packed refs are preserved' \
        'git branch q &&
         git pack-refs --all --prune &&
         git update-ref refs/heads/q refs/heads/q &&
         ! test -f .git/refs/heads/q'

test_expect_success 'pack, prune and repack' '
        git tag foo &&
        git pack-refs --all --prune &&
        git show-ref >all-of-them &&
        git pack-refs &&
        git show-ref >again &&
        test_cmp all-of-them again
'

test_expect_success 'explicit pack-refs with dangling packed reference' '
        git commit --allow-empty -m "soon to be garbage-collected" &&
        git pack-refs --all &&
        git reset --hard HEAD^ &&
        git reflog expire --expire=all --all &&
        git prune --expire=all &&
        git pack-refs --all 2>result &&
        test_cmp /dev/null result
'

test_expect_success 'delete ref with dangling packed version' '
        git checkout -b lamb &&
        git commit --allow-empty -m "future garbage" &&
        git pack-refs --all &&
        git reset --hard HEAD^ &&
        git checkout master &&
        git reflog expire --expire=all --all &&
        git prune --expire=all &&
        git branch -d lamb 2>result &&
        test_cmp /dev/null result
'

test_expect_success 'delete ref while another dangling packed ref' '
        git branch lamb &&
        git commit --allow-empty -m "future garbage" &&
        git pack-refs --all &&
        git reset --hard HEAD^ &&
        git reflog expire --expire=all --all &&
        git prune --expire=all &&
        git branch -d lamb 2>result &&
        test_cmp /dev/null result
'

test_expect_success 'pack ref directly below refs/' '
        git update-ref refs/top HEAD &&
        git pack-refs --all --prune &&
        grep refs/top .git/packed-refs &&
        test_path_is_missing .git/refs/top
'

test_expect_success 'disable reflogs' '
        git config core.logallrefupdates false &&
        rm -rf .git/logs
'

test_expect_success 'create packed foo/bar/baz branch' '
        git branch foo/bar/baz &&
        git pack-refs --all --prune &&
        test_path_is_missing .git/refs/heads/foo/bar/baz &&
        test_path_is_missing .git/logs/refs/heads/foo/bar/baz
'

test_expect_success 'notice d/f conflict with existing directory' '
        test_must_fail git branch foo &&
        test_must_fail git branch foo/bar
'

test_expect_success 'existing directory reports concrete ref' '
        test_must_fail git branch foo 2>stderr &&
        grep refs/heads/foo/bar/baz stderr
'

test_expect_success 'notice d/f conflict with existing ref' '
        test_must_fail git branch foo/bar/baz/extra &&
        test_must_fail git branch foo/bar/baz/lots/of/extra/components
'

test_expect_success 'timeout if packed-refs.lock exists' '
        LOCK=.git/packed-refs.lock &&
        >"$LOCK" &&
        test_when_finished "rm -f $LOCK" &&
        test_must_fail git pack-refs --all --prune
'

test_expect_success 'retry acquiring packed-refs.lock' '
        LOCK=.git/packed-refs.lock &&
        >"$LOCK" &&
        test_when_finished "wait; rm -f $LOCK" &&
        {
                ( sleep 1 ; rm -f $LOCK ) &
        } &&
        git -c core.packedrefstimeout=3000 pack-refs --all --prune
'

test_done