setup git server by git-daemon

以前做過一次:

• public git server by git-daemon

但是在 ubuntu 18.04 上就不行了，說沒有 supervise/ok, status, lock.. etc --- 都是 sv 藥用的東西。
因為 git-daemon-run 是用 sv 來啟動的。

實際上 git-daemon 包含在git 的source code ，所以 apt install git-core 就會有 git-daemon 。
git-daemon 提供 git:// 的服務。
所以只要設定對那些 folder 提供服務，允不允許 write (push). 其他就一些 log 之類的..
跟用什麼serive manager 無關。

測試:

手動 adduser gitdaemon，然後登入 gitdaemon, run git-daemon，看看git:// 有沒有作用。

這樣就可以把gitdaemon的 HOME 作為 git repository，create new repo 也只要login 成 gitdaemon, 在 自己目錄下 clone --bare 就可以。

OK 之後再寫到 systemd service.

$ sudo adduser gitdaemon
$ sudo su - gitdaemon
$ mkdir repository
$ cd repository
$ git clone --bare /home/test/test test.git
$ /usr/lib/git-core/git-daemon --export-all --verbose --enable=receive-pack --syslog --base-path=/home/gitdaemon/repository /home/gitdaemon/repository

這樣，其他user 就可以:

git clone git::/127.0.0.1/testgit.git

---

手動 OK 後，寫 systemd service file:

$ cat /etc/systemd/system/gitdaemon.service 
[Unit]
Description = Git Daemon Service

[Service]
Type=simple
User=gitdaemon
ExecStart=/usr/lib/git-core/git-daemon --export-all --verbose --enable=receive-pack --syslog --base-path=/home/gitdaemon/repository /home/gitdaemon/repository &

[Install]
WantedBy=multi-user.target

新增後，enable & start，看 status:

$ sudo systemctl status gitdaemon.service
● gitdaemon.service - Git Daemon Service
   Loaded: loaded (/etc/systemd/system/gitdaemon.service; enabled; vendor preset: enabled)
   Active: active (running) since Wed 2023-09-27 16:29:00 CST; 1min 47s ago
 Main PID: 8231 (git-daemon)
    Tasks: 1 (limit: 4915)
   CGroup: /system.slice/gitdaemon.service
           └─8231 /usr/lib/git-core/git-daemon --export-all --verbose --enable=receive-pack --syslog --base-path=/home/gitdaemon/repository /home/gitdaemon/repository &

Sep 27 16:29:00 xeontitan systemd[1]: Started Git Daemon Service.
Sep 27 16:29:00 xeontitan git-daemon[8231]: Ready to rumble
Sep 27 16:29:32 xeontitan git-daemon[8252]: Connection from 192.168.147.182:56802
Sep 27 16:29:32 xeontitan git-daemon[8252]: Extended attribute "host": xeontitan
Sep 27 16:29:32 xeontitan git-daemon[8252]: Request upload-pack for '/testgit.git'
Sep 27 16:29:32 xeontitan git-daemon[8231]: [8252] Disconnected
Sep 27 16:29:57 xeontitan git-daemon[8262]: Connection from 192.168.147.182:52568
Sep 27 16:29:57 xeontitan git-daemon[8262]: Extended attribute "host": xeontitan
Sep 27 16:29:57 xeontitan git-daemon[8262]: Request receive-pack for '/testgit.git'
Sep 27 16:29:57 xeontitan git-daemon[8231]: [8262] Disconnected

這樣應該就成功了。

---

之後多人同時做 android 的 repo sync 時，出現 error

remote: Counting objects: 100% (128934/128934), done.
remote: Compressing objects: 100% (53641/53641), done.
remote: Total 128913 (delta 57825), reused 127304 (delta 56375)
Fetching: 78% (792/1011) 41:10 | 10 jobs | 16:10 platform/frameworks/base @ frameworks/base
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

platform/prebuilts/android-emulator:
fatal: Could not read from remote repository.

查 syslog 有:

Oct  4 13:11:48 rd1-ubuntu git-daemon[1791508]: Too many children, dropping connection
Oct  4 13:11:51 rd1-ubuntu git-daemon[1791508]: message repeated 3 times: [ Too many children, dropping connection]

查git-daemon 的 option 說明有:

     --max-connections=<n>
         Maximum number of concurrent clients, defaults to 32.
         Set it to zero for no limit.

所以修改 git-daemon service:

$ cat /etc/systemd/system/gitdaemon.service
[Unit]
Description = Git Daemon Service

[Service]
Type=simple
User=gitdaemon
ExecStart=/usr/lib/git-core/git-daemon --export-all --verbose --enable=receive-pack --syslog --max-connections=0 --base-path=/home/gitdaemon/repository /home/gitdaemon/repository &

[Install]
WantedBy=multi-user.target

然後做 stop, daemon-reload, start..