#!/bin/sh

test_description='basic git gc tests
'

. ./test-lib.sh

test_expect_success 'setup' '
        # do not let the amount of physical memory affects gc
        # behavior, make sure we always pack everything to one pack by
        # default
        git config gc.bigPackThreshold 2g
'

test_expect_success 'gc empty repository' '
        git gc
'

test_expect_success 'gc does not leave behind pid file' '
        git gc &&
        test_path_is_missing .git/gc.pid
'

test_expect_success 'gc --gobbledegook' '
        test_expect_code 129 git gc --nonsense 2>err &&
        test_i18ngrep "[Uu]sage: git gc" err
'

test_expect_success 'gc -h with invalid configuration' '
        mkdir broken &&
        (
                cd broken &&
                git init &&
                echo "[gc] pruneexpire = CORRUPT" >>.git/config &&
                test_expect_code 129 git gc -h >usage 2>&1
        ) &&
        test_i18ngrep "[Uu]sage" broken/usage
'

test_expect_success 'gc is not aborted due to a stale symref' '
        git init remote &&
        (
                cd remote &&
                test_commit initial &&
                git clone . ../client &&
                git branch -m develop &&
                cd ../client &&
                git fetch --prune &&
                git gc
        )
'

test_expect_success 'gc --keep-largest-pack' '
        test_create_repo keep-pack &&
        (
                cd keep-pack &&
                test_commit one &&
                test_commit two &&
                test_commit three &&
                git gc &&
                ( cd .git/objects/pack && ls *.pack ) >pack-list &&
                test_line_count = 1 pack-list &&
                BASE_PACK=.git/objects/pack/pack-*.pack &&
                test_commit four &&
                git repack -d &&
                test_commit five &&
                git repack -d &&
                ( cd .git/objects/pack && ls *.pack ) >pack-list &&
                test_line_count = 3 pack-list &&
                git gc --keep-largest-pack &&
                ( cd .git/objects/pack && ls *.pack ) >pack-list &&
                test_line_count = 2 pack-list &&
                test_path_is_file $BASE_PACK &&
                git fsck
        )
'

test_expect_success 'auto gc with too many loose objects does not attempt to create bitmaps' '
        test_config gc.auto 3 &&
        test_config gc.autodetach false &&
        test_config pack.writebitmaps true &&
        # We need to create two object whose sha1s start with 17
        # since this is what git gc counts.  As it happens, these
        # two blobs will do so.
        test_commit 263 &&
        test_commit 410 &&
        # Our first gc will create a pack; our second will create a second pack
        git gc --auto &&
        ls .git/objects/pack | sort >existing_packs &&
        test_commit 523 &&
        test_commit 790 &&

        git gc --auto 2>err &&
        test_i18ngrep ! "^warning:" err &&
        ls .git/objects/pack/ | sort >post_packs &&
        comm -1 -3 existing_packs post_packs >new &&
        comm -2 -3 existing_packs post_packs >del &&
        test_line_count = 0 del && # No packs are deleted
        test_line_count = 2 new # There is one new pack and its .idx
'

run_and_wait_for_auto_gc () {
        # We read stdout from gc for the side effect of waiting until the
        # background gc process exits, closing its fd 9.  Furthermore, the
        # variable assignment from a command substitution preserves the
        # exit status of the main gc process.
        # Note: this fd trickery doesn't work on Windows, but there is no
        # need to, because on Win the auto gc always runs in the foreground.
        doesnt_matter=$(git gc --auto 9>&1)
}

test_expect_success 'background auto gc does not run if gc.log is present and recent but does if it is old' '
        test_commit foo &&
        test_commit bar &&
        git repack &&
        test_config gc.autopacklimit 1 &&
        test_config gc.autodetach true &&
        echo fleem >.git/gc.log &&
        test_must_fail git gc --auto 2>err &&
        test_i18ngrep "^error:" err &&
        test_config gc.logexpiry 5.days &&
        test-tool chmtime =-345600 .git/gc.log &&
        test_must_fail git gc --auto &&
        test_config gc.logexpiry 2.days &&
        run_and_wait_for_auto_gc &&
        ls .git/objects/pack/pack-*.pack >packs &&
        test_line_count = 1 packs
'

test_expect_success 'background auto gc respects lock for all operations' '
        # make sure we run a background auto-gc
        test_commit make-pack &&
        git repack &&
        test_config gc.autopacklimit 1 &&
        test_config gc.autodetach true &&

        # create a ref whose loose presence we can use to detect a pack-refs run
        git update-ref refs/heads/should-be-loose HEAD &&
        test_path_is_file .git/refs/heads/should-be-loose &&

        # now fake a concurrent gc that holds the lock; we can use our
        # shell pid so that it looks valid.
        hostname=$(hostname || echo unknown) &&
        printf "$$ %s" "$hostname" >.git/gc.pid &&

        # our gc should exit zero without doing anything
        run_and_wait_for_auto_gc &&
        test_path_is_file .git/refs/heads/should-be-loose
'

# DO NOT leave a detached auto gc process running near the end of the
# test script: it can run long enough in the background to racily
# interfere with the cleanup in 'test_done'.

test_done