git-commit-vandalism/t/t5200-update-server-info.sh
Eric Wong f4f476b6a1 update-server-info: avoid needless overwrites
Do not change the existing info/refs and objects/info/packs
files if they match the existing content on the filesystem.
This is intended to preserve mtime and make it easier for dumb
HTTP pollers to rely on the If-Modified-Since header.

Combined with stdio and kernel buffering; the kernel should be
able to avoid block layer writes and reduce wear for small files.

As a result, the --force option is no longer needed.  So stop
documenting it, but let it remain for compatibility (and
debugging, if necessary).

v3: perform incremental comparison while generating to avoid
    OOM with giant files.  Remove documentation for --force.

Signed-off-by: Eric Wong <e@80x24.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-05-15 14:07:37 +09:00

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#!/bin/sh
test_description='Test git update-server-info'
. ./test-lib.sh
test_expect_success 'setup' 'test_commit file'
test_expect_success 'create info/refs' '
git update-server-info &&
test_path_is_file .git/info/refs
'
test_expect_success 'modify and store mtime' '
test-tool chmtime =0 .git/info/refs &&
test-tool chmtime --get .git/info/refs >a
'
test_expect_success 'info/refs is not needlessly overwritten' '
git update-server-info &&
test-tool chmtime --get .git/info/refs >b &&
test_cmp a b
'
test_expect_success 'info/refs can be forced to update' '
git update-server-info -f &&
test-tool chmtime --get .git/info/refs >b &&
! test_cmp a b
'
test_expect_success 'info/refs updates when changes are made' '
test-tool chmtime =0 .git/info/refs &&
test-tool chmtime --get .git/info/refs >b &&
test_cmp a b &&
git update-ref refs/heads/foo HEAD &&
git update-server-info &&
test-tool chmtime --get .git/info/refs >b &&
! test_cmp a b
'
test_done