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Running a textconv filter can take a long time. It's particularly bad for a large file which needs to be spooled to disk, but even for small files, the fork+exec overhead can add up for something like "git log -p". This patch uses the notes-cache mechanism to keep a fast cache of textconv output. Caches are stored in refs/notes/textconv/$x, where $x is the userdiff driver defined in gitattributes. Caching is enabled only if diff.$x.cachetextconv is true. In my test repo, on a commit with 45 jpg and avi files changed and a textconv to show their exif tags: [before] $ time git show >/dev/null real 0m13.724s user 0m12.057s sys 0m1.624s [after, first run] $ git config diff.mfo.cachetextconv true $ time git show >/dev/null real 0m14.252s user 0m12.197s sys 0m1.800s [after, subsequent runs] $ time git show >/dev/null real 0m0.352s user 0m0.148s sys 0m0.200s So for a slight (3.8%) cost on the first run, we achieve an almost 40x speed up on subsequent runs. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
109 lines
2.3 KiB
Bash
Executable file
109 lines
2.3 KiB
Bash
Executable file
#!/bin/sh
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test_description='test textconv caching'
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. ./test-lib.sh
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cat >helper <<'EOF'
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#!/bin/sh
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sed 's/^/converted: /' "$@" >helper.out
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cat helper.out
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EOF
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chmod +x helper
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test_expect_success 'setup' '
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echo foo content 1 >foo.bin &&
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echo bar content 1 >bar.bin &&
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git add . &&
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git commit -m one &&
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echo foo content 2 >foo.bin &&
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echo bar content 2 >bar.bin &&
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git commit -a -m two &&
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echo "*.bin diff=magic" >.gitattributes &&
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git config diff.magic.textconv ./helper &&
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git config diff.magic.cachetextconv true
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'
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cat >expect <<EOF
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diff --git a/bar.bin b/bar.bin
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index fcf9166..28283d5 100644
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--- a/bar.bin
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+++ b/bar.bin
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@@ -1 +1 @@
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-converted: bar content 1
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+converted: bar content 2
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diff --git a/foo.bin b/foo.bin
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index d5b9fe3..1345db2 100644
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--- a/foo.bin
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+++ b/foo.bin
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@@ -1 +1 @@
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-converted: foo content 1
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+converted: foo content 2
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EOF
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test_expect_success 'first textconv works' '
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git diff HEAD^ HEAD >actual &&
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test_cmp expect actual
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'
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test_expect_success 'cached textconv produces same output' '
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git diff HEAD^ HEAD >actual &&
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test_cmp expect actual
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'
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test_expect_success 'cached textconv does not run helper' '
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rm -f helper.out &&
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git diff HEAD^ HEAD >actual &&
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test_cmp expect actual &&
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! test -r helper.out
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'
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cat >expect <<EOF
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diff --git a/bar.bin b/bar.bin
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index fcf9166..28283d5 100644
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--- a/bar.bin
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+++ b/bar.bin
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@@ -1,2 +1,2 @@
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converted: other
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-converted: bar content 1
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+converted: bar content 2
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diff --git a/foo.bin b/foo.bin
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index d5b9fe3..1345db2 100644
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--- a/foo.bin
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+++ b/foo.bin
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@@ -1,2 +1,2 @@
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converted: other
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-converted: foo content 1
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+converted: foo content 2
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EOF
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test_expect_success 'changing textconv invalidates cache' '
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echo other >other &&
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git config diff.magic.textconv "./helper other" &&
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git diff HEAD^ HEAD >actual &&
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test_cmp expect actual
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'
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cat >expect <<EOF
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diff --git a/bar.bin b/bar.bin
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index fcf9166..28283d5 100644
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--- a/bar.bin
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+++ b/bar.bin
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@@ -1,2 +1,2 @@
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converted: other
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-converted: bar content 1
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+converted: bar content 2
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diff --git a/foo.bin b/foo.bin
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index d5b9fe3..1345db2 100644
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--- a/foo.bin
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+++ b/foo.bin
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@@ -1 +1 @@
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-converted: foo content 1
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+converted: foo content 2
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EOF
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test_expect_success 'switching diff driver produces correct results' '
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git config diff.moremagic.textconv ./helper &&
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echo foo.bin diff=moremagic >>.gitattributes &&
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git diff HEAD^ HEAD >actual &&
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test_cmp expect actual
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'
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test_done
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