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https://github.com/git/git
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9d505b7b49
It is useful to know when a branch first diverged in history
from some integration branch in order to be able to enumerate
the user's local changes. However, these local changes can
include arbitrary merges, so it is necessary to ignore this
merge structure when finding the divergence point.
In order to do this, teach the "rev-list" family to accept
"--exclude-first-parent-only", which restricts the traversal
of excluded commits to only follow first parent links.
-A-----E-F-G--main
\ / /
B-C-D--topic
In this example, the goal is to return the set {B, C, D} which
represents a topic branch that has been merged into main branch.
`git rev-list topic ^main` will end up returning no commits
since excluding main will end up traversing the commits on topic
as well. `git rev-list --exclude-first-parent-only topic ^main`
however will return {B, C, D} as desired.
Add docs for the new flag, and clarify the doc for --first-parent
to indicate that it applies to traversing the set of included
commits only.
Signed-off-by: Jerry Zhang <jerry@skydio.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
287 lines
6.9 KiB
Bash
Executable file
287 lines
6.9 KiB
Bash
Executable file
#!/bin/sh
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test_description='merge simplification'
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GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
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export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
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. ./test-lib.sh
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note () {
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git tag "$1"
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}
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unnote () {
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git name-rev --tags --stdin | sed -e "s|$OID_REGEX (tags/\([^)]*\)) |\1 |g"
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}
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#
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# Create a test repo with an interesting commit graph:
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#
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# A-----B-----G--H--I--K--L
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# \ \ / /
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# \ \ / /
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# C--D--E--F J
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#
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# The commits are laid out from left-to-right starting with
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# the root commit A and terminating at the tip commit L.
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#
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# There are a few places where we adjust the commit date or
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# author date to make the --topo-order, --date-order, and
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# --author-date-order flags produce different output.
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test_expect_success setup '
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echo "Hi there" >file &&
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echo "initial" >lost &&
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git add file lost &&
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test_tick && git commit -m "Initial file and lost" &&
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note A &&
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git branch other-branch &&
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git symbolic-ref HEAD refs/heads/unrelated &&
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git rm -f "*" &&
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echo "Unrelated branch" >side &&
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git add side &&
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test_tick && git commit -m "Side root" &&
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note J &&
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git checkout main &&
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echo "Hello" >file &&
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echo "second" >lost &&
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git add file lost &&
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test_tick && GIT_AUTHOR_DATE=$(($test_tick + 120)) git commit -m "Modified file and lost" &&
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note B &&
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git checkout other-branch &&
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echo "Hello" >file &&
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>lost &&
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git add file lost &&
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test_tick && git commit -m "Modified the file identically" &&
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note C &&
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echo "This is a stupid example" >another-file &&
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git add another-file &&
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test_tick && git commit -m "Add another file" &&
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note D &&
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test_tick &&
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test_must_fail git merge -m "merge" main &&
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>lost && git commit -a -m "merge" &&
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note E &&
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echo "Yet another" >elif &&
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git add elif &&
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test_tick && git commit -m "Irrelevant change" &&
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note F &&
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git checkout main &&
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echo "Yet another" >elif &&
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git add elif &&
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test_tick && git commit -m "Another irrelevant change" &&
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note G &&
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test_tick && git merge -m "merge" other-branch &&
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note H &&
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echo "Final change" >file &&
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test_tick && git commit -a -m "Final change" &&
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note I &&
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git checkout main &&
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test_tick && git merge --allow-unrelated-histories -m "Coolest" unrelated &&
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note K &&
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echo "Immaterial" >elif &&
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git add elif &&
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test_tick && git commit -m "Last" &&
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note L
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'
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FMT='tformat:%P %H | %s'
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check_outcome () {
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outcome=$1
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shift
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for c in $1
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do
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echo "$c"
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done >expect &&
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shift &&
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param="$*" &&
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test_expect_$outcome "log $param" '
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git log --pretty="$FMT" --parents $param |
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unnote >actual &&
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sed -e "s/^.* \([^ ]*\) .*/\1/" >check <actual &&
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test_cmp expect check
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'
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}
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check_result () {
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check_outcome success "$@"
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}
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check_result 'L K J I H F E D C G B A' --full-history --topo-order
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check_result 'L K I H G F E D C B J A' --full-history
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check_result 'L K I H G F E D C B J A' --full-history --date-order
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check_result 'L K I H G F E D B C J A' --full-history --author-date-order
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check_result 'K I H E C B A' --full-history -- file
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check_result 'K I H E C B A' --full-history --topo-order -- file
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check_result 'K I H E C B A' --full-history --date-order -- file
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check_result 'K I H E B C A' --full-history --author-date-order -- file
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check_result 'I E C B A' --simplify-merges -- file
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check_result 'I E C B A' --simplify-merges --topo-order -- file
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check_result 'I E C B A' --simplify-merges --date-order -- file
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check_result 'I E B C A' --simplify-merges --author-date-order -- file
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check_result 'I B A' -- file
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check_result 'I B A' --topo-order -- file
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check_result 'I B A' --date-order -- file
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check_result 'I B A' --author-date-order -- file
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check_result 'H' --first-parent -- another-file
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check_result 'H' --first-parent --topo-order -- another-file
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check_result 'L K I H G B A' --first-parent L
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check_result 'F E D C' --exclude-first-parent-only F ^L
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check_result '' F ^L
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check_result 'L K I H G J' L ^F
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check_result 'L K I H G B J' --exclude-first-parent-only L ^F
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check_result 'L K I H G B' --exclude-first-parent-only --first-parent L ^F
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check_result 'E C B A' --full-history E -- lost
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test_expect_success 'full history simplification without parent' '
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printf "%s\n" E C B A >expect &&
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git log --pretty="$FMT" --full-history E -- lost |
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unnote >actual &&
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sed -e "s/^.* \([^ ]*\) .*/\1/" >check <actual &&
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test_cmp expect check
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'
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test_expect_success '--full-diff is not affected by --parents' '
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git log -p --pretty="%H" --full-diff -- file >expected &&
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git log -p --pretty="%H" --full-diff --parents -- file >actual &&
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test_cmp expected actual
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'
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#
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# Create a new history to demonstrate the value of --show-pulls
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# with respect to the subtleties of simplified history, --full-history,
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# and --simplify-merges.
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#
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# .-A---M-----C--N---O---P
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# / / \ \ \/ / /
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# I B \ R-'`-Z' /
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# \ / \/ /
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# \ / /\ /
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# `---X--' `---Y--'
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#
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# This example is explained in Documentation/rev-list-options.txt
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test_expect_success 'setup rebuild repo' '
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rm -rf .git * &&
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git init &&
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git switch -c topic &&
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echo base >file &&
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git add file &&
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test_commit I &&
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echo A >file &&
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git add file &&
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test_commit A &&
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git switch -c branchB I &&
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echo B >file &&
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git add file &&
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test_commit B &&
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git switch topic &&
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test_must_fail git merge -m "M" B &&
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echo A >file &&
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echo B >>file &&
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git add file &&
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git merge --continue &&
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note M &&
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echo C >other &&
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git add other &&
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test_commit C &&
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git switch -c branchX I &&
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echo X >file &&
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git add file &&
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test_commit X &&
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git switch -c branchR M &&
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git merge -m R -Xtheirs X &&
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note R &&
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git switch topic &&
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git merge -m N R &&
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note N &&
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git switch -c branchY M &&
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echo Y >y &&
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git add y &&
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test_commit Y &&
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git switch -c branchZ C &&
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echo Z >z &&
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git add z &&
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test_commit Z &&
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git switch topic &&
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git merge -m O Z &&
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note O &&
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git merge -m P Y &&
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note P
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'
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check_result 'X I' -- file
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check_result 'N R X I' --show-pulls -- file
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check_result 'P O N R X M B A I' --full-history --topo-order -- file
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check_result 'N R X M B A I' --simplify-merges --topo-order --show-pulls -- file
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check_result 'R X M B A I' --simplify-merges --topo-order -- file
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check_result 'N M A I' --first-parent -- file
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check_result 'N M A I' --first-parent --show-pulls -- file
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# --ancestry-path implies --full-history
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check_result 'P O N R M' --topo-order \
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--ancestry-path A..HEAD -- file
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check_result 'P O N R M' --topo-order \
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--show-pulls \
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--ancestry-path A..HEAD -- file
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check_result 'P O N R M' --topo-order \
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--full-history \
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--ancestry-path A..HEAD -- file
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check_result 'R M' --topo-order \
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--simplify-merges \
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--ancestry-path A..HEAD -- file
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check_result 'N R M' --topo-order \
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--simplify-merges --show-pulls \
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--ancestry-path A..HEAD -- file
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test_expect_success 'log --graph --simplify-merges --show-pulls' '
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cat >expect <<-\EOF &&
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* N
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* R
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| * X
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* | M
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|\ \
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| * | B
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* / A
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|/
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* I
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EOF
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git log --graph --pretty="%s" \
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--simplify-merges --show-pulls \
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-- file >actual &&
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test_cmp expect actual
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'
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test_done
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