102 lines
2.4 KiB
Bash
Executable File
102 lines
2.4 KiB
Bash
Executable File
#!/bin/sh
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test_description='Test git merge-base'
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. ./perf-lib.sh
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test_perf_fresh_repo
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#
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# Creates lots of merges to make history traversal costly. In
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# particular it creates 2^($max_level-1)-1 2-way merges on top of
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# 2^($max_level-1) root commits. E.g., the commit history looks like
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# this for a $max_level of 3:
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#
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# _1_
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# / \
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# 2 3
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# / \ / \
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# 4 5 6 7
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#
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# The numbers are the fast-import marks, which also are the commit
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# messages. 1 is the HEAD commit and a merge, 2 and 3 are also merges,
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# 4-7 are the root commits.
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#
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build_history () {
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local max_level="$1" &&
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local level="${2:-1}" &&
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local mark="${3:-1}" &&
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if test $level -eq $max_level
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then
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echo "reset refs/heads/master" &&
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echo "from $ZERO_OID" &&
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echo "commit refs/heads/master" &&
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echo "mark :$mark" &&
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echo "committer C <c@example.com> 1234567890 +0000" &&
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echo "data <<EOF" &&
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echo "$mark" &&
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echo "EOF"
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else
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local level1=$((level+1)) &&
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local mark1=$((2*mark)) &&
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local mark2=$((2*mark+1)) &&
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build_history $max_level $level1 $mark1 &&
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build_history $max_level $level1 $mark2 &&
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echo "commit refs/heads/master" &&
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echo "mark :$mark" &&
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echo "committer C <c@example.com> 1234567890 +0000" &&
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echo "data <<EOF" &&
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echo "$mark" &&
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echo "EOF" &&
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echo "from :$mark1" &&
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echo "merge :$mark2"
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fi
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}
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#
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# Creates a new merge history in the same shape as build_history does,
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# while reusing the same root commits. This way the two top commits
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# have 2^($max_level-1) merge bases between them.
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#
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build_history2 () {
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local max_level="$1" &&
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local level="${2:-1}" &&
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local mark="${3:-1}" &&
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if test $level -lt $max_level
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then
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local level1=$((level+1)) &&
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local mark1=$((2*mark)) &&
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local mark2=$((2*mark+1)) &&
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build_history2 $max_level $level1 $mark1 &&
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build_history2 $max_level $level1 $mark2 &&
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echo "commit refs/heads/master" &&
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echo "mark :$mark" &&
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echo "committer C <c@example.com> 1234567890 +0000" &&
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echo "data <<EOF" &&
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echo "$mark II" &&
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echo "EOF" &&
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echo "from :$mark1" &&
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echo "merge :$mark2"
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fi
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}
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test_expect_success 'setup' '
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max_level=15 &&
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build_history $max_level | git fast-import --export-marks=marks &&
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git tag one &&
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build_history2 $max_level | git fast-import --import-marks=marks --force &&
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git tag two &&
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git gc &&
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git log --format=%H --no-merges >expect
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'
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test_perf 'git merge-base' '
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git merge-base --all one two >actual
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'
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test_expect_success 'verify result' '
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test_cmp expect actual
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'
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test_done
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