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Revision 663b2b1b90bf76275044824ddeca96aaec240f09 authored by Derrick Stolee on 17 September 2020, 18:11:46 UTC, committed by Junio C Hamano on 17 September 2020, 18:30:05 UTC 
maintenance: add commit-graph task
 
The first new task in the 'git maintenance' builtin is the
'commit-graph' task. This updates the commit-graph file
incrementally with the command

	git commit-graph write --reachable --split

By writing an incremental commit-graph file using the "--split"
option we minimize the disruption from this operation. The default
behavior is to merge layers until the new "top" layer is less than
half the size of the layer below. This provides quick writes most
of the time, with the longer writes following a power law
distribution.

Most importantly, concurrent Git processes only look at the
commit-graph-chain file for a very short amount of time, so they
will verly likely not be holding a handle to the file when we try
to replace it. (This only matters on Windows.)

If a concurrent process reads the old commit-graph-chain file, but
our job expires some of the .graph files before they can be read,
then those processes will see a warning message (but not fail).
This could be avoided by a future update to use the --expire-time
argument when writing the commit-graph.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
1 parent 3103e98
Raw File
t7609-merge-co-error-msgs.sh 
#!/bin/sh

test_description='unpack-trees error messages'

. ./test-lib.sh


test_expect_success 'setup' '
	echo one >one &&
	git add one &&
	git commit -a -m First &&

	git checkout -b branch &&
	echo two >two &&
	echo three >three &&
	echo four >four &&
	echo five >five &&
	git add two three four five &&
	git commit -m Second &&

	git checkout master &&
	echo other >two &&
	echo other >three &&
	echo other >four &&
	echo other >five
'

cat >expect <<\EOF
error: The following untracked working tree files would be overwritten by merge:
	five
	four
	three
	two
Please move or remove them before you merge.
Aborting
EOF

test_expect_success 'untracked files overwritten by merge (fast and non-fast forward)' '
	test_must_fail git merge branch 2>out &&
	test_i18ncmp out expect &&
	git commit --allow-empty -m empty &&
	(
		GIT_MERGE_VERBOSITY=0 &&
		export GIT_MERGE_VERBOSITY &&
		test_must_fail git merge branch 2>out2
	) &&
	test_i18ncmp out2 expect &&
	git reset --hard HEAD^
'

cat >expect <<\EOF
error: Your local changes to the following files would be overwritten by merge:
	four
	three
	two
Please commit your changes or stash them before you merge.
error: The following untracked working tree files would be overwritten by merge:
	five
Please move or remove them before you merge.
Aborting
EOF

test_expect_success 'untracked files or local changes ovewritten by merge' '
	git add two &&
	git add three &&
	git add four &&
	test_must_fail git merge branch 2>out &&
	test_i18ncmp out expect
'

cat >expect <<\EOF
error: Your local changes to the following files would be overwritten by checkout:
	rep/one
	rep/two
Please commit your changes or stash them before you switch branches.
Aborting
EOF

test_expect_success 'cannot switch branches because of local changes' '
	git add five &&
	mkdir rep &&
	echo one >rep/one &&
	echo two >rep/two &&
	git add rep/one rep/two &&
	git commit -m Fourth &&
	git checkout master &&
	echo uno >rep/one &&
	echo dos >rep/two &&
	test_must_fail git checkout branch 2>out &&
	test_i18ncmp out expect
'

cat >expect <<\EOF
error: Your local changes to the following files would be overwritten by checkout:
	rep/one
	rep/two
Please commit your changes or stash them before you switch branches.
Aborting
EOF

test_expect_success 'not uptodate file porcelain checkout error' '
	git add rep/one rep/two &&
	test_must_fail git checkout branch 2>out &&
	test_i18ncmp out expect
'

cat >expect <<\EOF
error: Updating the following directories would lose untracked files in them:
	rep
	rep2

Aborting
EOF

test_expect_success 'not_uptodate_dir porcelain checkout error' '
	git init uptodate &&
	cd uptodate &&
	mkdir rep &&
	mkdir rep2 &&
	touch rep/foo &&
	touch rep2/foo &&
	git add rep/foo rep2/foo &&
	git commit -m init &&
	git checkout -b branch &&
	git rm rep -r &&
	git rm rep2 -r &&
	>rep &&
	>rep2 &&
	git add rep rep2 &&
	git commit -m "added test as a file" &&
	git checkout master &&
	>rep/untracked-file &&
	>rep2/untracked-file &&
	test_must_fail git checkout branch 2>out &&
	test_i18ncmp out ../expect
'

test_done
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