git gc writeup

[hle4s@pwnlab CWD:chall]$ git log
commit c0bf20c191a250522fc742093ff920243346f578 (HEAD -> main)
Author: AlpacaHack <[email protected]>
Date:   Sat Jan 10 01:45:04 2026 +0900

    initial commit
[hle4s@pwnlab CWD:chall]$
// Searching clues for flag
[hle4s@pwnlab CWD:chall]$ rg flag -uuu
.git/hooks/fsmonitor-watchman.sample
140:            # return the fast "everything is dirty" flag to git and do the

.git/COMMIT_EDITMSG
1:add flag

.git/logs/HEAD
2:c0bf20c191a250522fc742093ff920243346f578 75a6ad9f0abe942df11f90b58f175d553c23c101 AlpacaHack <[email protected]> 1767977104 +0900        commit: add flag

.git/logs/refs/heads/main
2:c0bf20c191a250522fc742093ff920243346f578 75a6ad9f0abe942df11f90b58f175d553c23c101 AlpacaHack <[email protected]> 1767977104 +0900        commit: add flag
// I found hash for the commit, 'add flag' and just checkout to it.
[hle4s@pwnlab CWD:chall]$ git checkout 75a6ad9f0abe942df11f90b58f175d553c23c101
Note: switching to '75a6ad9f0abe942df11f90b58f175d553c23c101'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by switching back to a branch.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -c with the switch command. Example:

  git switch -c <new-branch-name>

Or undo this operation with:

  git switch -

Turn off this advice by setting config variable advice.detachedHead to false

HEAD is now at 75a6ad9 add flag
[hle4s@pwnlab CWD:chall]$ git log
commit 75a6ad9f0abe942df11f90b58f175d553c23c101 (HEAD)
Author: AlpacaHack <[email protected]>
Date:   Sat Jan 10 01:45:04 2026 +0900

    add flag

commit c0bf20c191a250522fc742093ff920243346f578 (main)
Author: AlpacaHack <[email protected]>
Date:   Sat Jan 10 01:45:04 2026 +0900

    initial commit
[hle4s@pwnlab CWD:chall]$ ll
total 4
-rw-r--r-- 1 hle4s hle4s 36 Jan 28 11:52 flag.txt
[hle4s@pwnlab CWD:chall]$ cat flag.txt
Alpaca{--prune=now_1s_4ll_y0u_n33d}