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Guildenstern
Asked: 2024-10-29 01:53:26 +0800 CST

如何获取带注释的标签的 reflog？

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我已将 Git 配置为记录所有引用的引用日志：

$ git config core.logallrefupdates
always

并且这有效。包括记录带注释标签的引用日志。但 git reflog如果引用指向带注释的标签，则不会给出任何输出：

$ git reflog anno1
<no output>

然而，它适用于轻量级标签。据说是因为轻量级标签直接指向提交（不同于带注释的标签指向标签对象）。

git tag --force […]如果我想“重置”（ ）到以前的状态，那么获取带注释的标签的 reflog 就好了。

我可以直接打印 reflog 文件，如下所示：

cat .git/logs/refs/tags/anno1

但我没有看到使用某些 git(1) 命令来实现此目的的方法。

git

1 个回答

  1. Best Answer

    通过测试“git tag”后跟“git reflog”的行为：

    # setup:
git init
git config core.logallrefupdates always

echo "aaa" > a.txt && git add . && git commit -m "a.txt"
echo "bbb" > b.txt && git add . && git commit -m "b.txt"
echo "ccc" > c.txt && git add . && git commit -m "c.txt"
echo "ddd" > d.txt && git add . && git commit -m "d.txt"

git log --oneline
# 0bd20d6 (HEAD -> master) d.txt
# ffd5ae1 c.txt
# 4fcdb8c b.txt
# ab28d11 a.txt

    # testing behavior of tag + reflog:

git tag foo HEAD~3  # 'foo' is a lightweight tag to a commit
git reflog foo
# ab28d11 (tag: foo) refs/tags/foo@{0}: tag: tagging ab28d11 (a.txt, 2024-10-29)

git tag --force foo -m "annotated" HEAD~2  # 'foo' is now an annotated tag
git reflog foo
# no output

git tag --force foo HEAD~1  # 'foo' is a lightweight tag to a commit again
git reflog foo
# ffd5ae1 (tag: foo) refs/tags/foo@{0}: tag: tagging ffd5ae1 (c.txt, 2024-10-29)   # note the foo@{0} and foo@{2}:
# ab28d11 refs/tags/foo@{2}: tag: tagging ab28d11 (a.txt, 2024-10-29)              #  only commits (the steps when 'foo' is a lightweight tag to a commit) are reported

git tag --force foo -m "annotated" HEAD  # 'foo' is an annotated tag again
git reflog foo
# no output

cat .git/logs/refs/tags/foo  # even though all changes are correctly recorded in the log
# 0000000000000000000000000000000000000000 ab28d1107a0c2ee820d0952caed5830ac53da724 LeGEC <[email protected]> 1730172212 +0200  tag: tagging ab28d11 (a.txt, 2024-10-29)
# ab28d1107a0c2ee820d0952caed5830ac53da724 4c248a3ad8933e0b16c97610b9ab664f30e2fe45 LeGEC <[email protected]> 1730172222 +0200  tag: tagging 4fcdb8c (b.txt, 2024-10-29)
# 4c248a3ad8933e0b16c97610b9ab664f30e2fe45 ffd5ae198cbcc9eae8cf6a26ce72229aa9770f0e LeGEC <[email protected]> 1730172241 +0200  tag: tagging ffd5ae1 (c.txt, 2024-10-29)
# ffd5ae198cbcc9eae8cf6a26ce72229aa9770f0e 14c9592ed9737d98ba6460bc37a3b9741342b944 LeGEC <[email protected]> 1730172255 +0200  tag: tagging 0bd20d6 (d.txt, 2024-10-29)


# for completion: check what happens when the tag points to a blob or tree:
git tag -f foo HEAD~1:c.txt  # 'foo' now tags a blob
git reflog foo
# no output

git tag -f foo HEAD~1:  # 'foo' now points to a tree
git cat-file -t foo
# tree
git reflog foo
# no output

cat .git/logs/refs/tags/foo  # again: all changes are recorded in the log
# 0000000000000000000000000000000000000000 ab28d1107a0c2ee820d0952caed5830ac53da724 LeGEC <[email protected]> 1730172212 +0200  tag: tagging ab28d11 (a.txt, 2024-10-29)
# ab28d1107a0c2ee820d0952caed5830ac53da724 4c248a3ad8933e0b16c97610b9ab664f30e2fe45 LeGEC <[email protected]> 1730172222 +0200  tag: tagging 4fcdb8c (b.txt, 2024-10-29)
# 4c248a3ad8933e0b16c97610b9ab664f30e2fe45 ffd5ae198cbcc9eae8cf6a26ce72229aa9770f0e LeGEC <[email protected]> 1730172241 +0200  tag: tagging ffd5ae1 (c.txt, 2024-10-29)
# ffd5ae198cbcc9eae8cf6a26ce72229aa9770f0e 14c9592ed9737d98ba6460bc37a3b9741342b944 LeGEC <[email protected]> 1730172255 +0200  tag: tagging 0bd20d6 (d.txt, 2024-10-29)
# 14c9592ed9737d98ba6460bc37a3b9741342b944 b2a7546679fdf79ca0eb7bfbee1e1bb342487380 LeGEC <[email protected]> 1730172610 +0200  tag: tagging b2a7546 (blob object)
# b2a7546679fdf79ca0eb7bfbee1e1bb342487380 15b6c2b4cbb04ddb97da706346ed34086664309d LeGEC <[email protected]> 1730172731 +0200  tag: tagging 15b6c2b (tree object)

    很明显，git reflog目前只处理commit对象。

    事实证明，当标签的当前值不是提交时（例如：当标签不是提交的轻量级标签时），git reflog甚至不会显示该引用的历史记录；
    而当它显示历史记录时，只会显示提交。

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