【发布时间】：2020-05-18 05:04:03
【问题描述】：
我正在尝试在启动时将 bash 脚本作为 systemd 服务运行，我正在使用 Raspbian Buster Lite 的 Raspberry Pi 4 上执行此操作。
如果我手动运行 bash 脚本./hls.sh，我可以执行它，如果我这样做sudo service tv start，我也可以运行该服务，但 tv.service 似乎无法执行 bash脚本hls.sh 开始。我确实为服务和 bash 文件授予了 chmod 777 权限。
如果有任何帮助，我将不胜感激，一个月来我一直在尝试解决这个问题。
编辑：
使用 Carl 的建议，我修改了文件。但是，它仍然不起作用。我还注意到，当 Type=oneshot 时，您不能执行 Restart=always，如果我执行 restorecon -r，则会出现一个错误，提示找不到该命令。根据 Carl 的建议，我将所有内容都放入 /opt 我决定不使用临时文件建议，因为我需要每次都将 ffmpeg 输出转到同一个地方（我的理解是另一种方式会随机生成一个文件夹？）。
Edit2：问题与此 systemd 问题有关：https://unix.stackexchange.com/questions/209832/debian-systemd-network-online-target-not-working 解决方法只是在 [Service] 下执行 RestartSec=5s
Bash 脚本 [之前]
#!/bin/bash
/usr/bin/ffmpeg -reconnect 1 -reconnect_at_eof 1 -reconnect_streamed 1 -reconnect_delay_max 2 -y -nostdin \
-hide_banner -loglevel fatal \
-i http://10.0.0.11:9981/stream/channelnumber/2 \
-vcodec copy -acodec copy -scodec copy -g 60 \
-fflags +genpts -user_agent HLS_delayer \
-metadata service_provider="TimeShift" \
-metadata service_name="TV 1" \
-f hls -hls_flags delete_segments \
-hls_time 60 \
-hls_list_size 480 \
-hls_wrap 481 \
-hls_segment_filename /home/pi/hls/1_%03d.ts /home/pi/hls/1_hls.m3u8
Bash 脚本 [之后]
#!/usr/bin/env bash
set -e -o pipefail # return exit code of command with non-zero exit code and stop executing
echo "The solution works!"
/usr/bin/ffmpeg -reconnect 1 -reconnect_at_eof 1 -reconnect_streamed 1 -reconnect_delay_max 2 -y -nostdin \
-hide_banner -loglevel fatal \
-i http://10.0.0.11:9981/stream/channelnumber/2 \
-vcodec copy -acodec copy -scodec copy -g 60 \
-fflags +genpts -user_agent HLS_delayer \
-metadata service_provider="TimeShift" \
-metadata service_name="JSTV 1" \
-f hls -hls_flags delete_segments \
-hls_time 60 \
-hls_list_size 480 \
-hls_wrap 481 \
-hls_segment_filename /opt/hls/tmp/1_%03d.ts /opt/hls/tmp/1_hls.m3u8
服务[之前]
[Unit]
Description=Timeshift TV
After=tvheadend.service
PartOf=tvheadend.service
Restart=always
[Service]
ExecStartPre=/bin/mkdir -p /home/pi/hls/
ExecStart=/home/pi/hls.sh 103 &
ExecStop=/bin/rm -rf /home/pi/hls
[Install]
WantedBy=default.target
服务 [之后]
[Unit]
Description=Timeshift TV
After=tvheadend.service
PartOf=tvheadend.service
[Service]
WorkingDirectory=/opt/hls
User=nobody
Type=oneshot
ExecStartPre=+/bin/mkdir -p -m777 /opt/hls/tmp
ExecStart=/opt/hls/hls.sh
ExecStopPost=+/bin/rm -rf /opt/hls/tmp
#Restart=always
[Install]
WantedBy=multi-user.target
重启后，通过 systemctl status [Before] 查看状态
● tv.service - Timeshift TV
Loaded: loaded (/etc/systemd/system/tv.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Mon 2020-05-18 05:36:40 BST; 45s ago
Process: 465 ExecStartPre=/bin/mkdir -p -m777 /home/pi/hls/ (code=exited, status=0/SUCCESS)
Process: 472 ExecStart=/home/pi/hls.sh 103 & (code=exited, status=1/FAILURE)
Main PID: 472 (code=exited, status=1/FAILURE)
May 18 05:36:39 tv3 systemd[1]: Starting Timeshift TV...
May 18 05:36:39 tv3 systemd[1]: Started Timeshift TV.
May 18 05:36:40 tv3 systemd[1]: tv.service: Main process exited, code=exited, status=1/FAILURE
May 18 05:36:40 tv3 systemd[1]: tv.service: Failed with result 'exit-code'.
重启后，通过 systemctl status [After] 查看状态
● tv.service - Timeshift tv
Loaded: loaded (/etc/systemd/system/tv.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Mon 2020-05-18 20:13:39 BST; 15min ago
Process: 464 ExecStartPre=/bin/mkdir -p -m777 /opt/hls/tmp (code=exited, status=0/SUCCESS)
Process: 471 ExecStart=/opt/hls/hls.sh (code=exited, status=1/FAILURE)
Process: 484 ExecStopPost=/bin/rm -rf /opt/hls/tmp (code=exited, status=0/SUCCESS)
Main PID: 471 (code=exited, status=1/FAILURE)
May 18 20:13:38 tv3 systemd[1]: Starting Timeshift tv...
May 18 20:13:38 tv3 hls.sh[471]: The solution works!
May 18 20:13:39 tv3 systemd[1]: tv.service: Main process exited, code=exited, status=1/FAILURE
May 18 20:13:39 tv3 systemd[1]: tv.service: Failed with result 'exit-code'.
May 18 20:13:39 tv3 systemd[1]: Failed to start Timeshift tv.
[之后]手动启动该过程仍然有效
● tv2.service - Timeshift tv
Loaded: loaded (/etc/systemd/system/tv2.service; enabled; vendor preset: enabled)
Active: activating (start) since Mon 2020-05-18 20:53:13 BST; 17s ago
Process: 865 ExecStartPre=/bin/mkdir -p -m777 /opt/hls/tmp (code=exited, status=0/SUCCESS)
Main PID: 866 (bash)
Tasks: 2 (limit: 4915)
Memory: 15.3M
CGroup: /system.slice/tv2.service
├─866 bash /opt/hls/hls.sh
└─867 /usr/bin/ffmpeg -reconnect 1 -reconnect_at_eof 1 -reconnect_streamed 1 -reconnect_delay_max 2 -y -nostdin -hide_banner -logle
May 18 20:53:13 tv3 systemd[1]: Starting Timeshift tv...
May 18 20:53:13 tv3 hls.sh[866]: The solution works!
pi@tv3:/etc/systemd/system $ cd /opt/hls
pi@tv3:/opt/hls $ ls
hls.sh tmp
pi@tv3:/opt/hls $ cd tmp
pi@tv3:/opt/hls/tmp $ ls
1_000.ts
【问题讨论】：
-
您确定服务文件中允许使用 & 吗？我认为不需要。尝试删除它。
-
& 绝对是多余的
标签： linux bash raspberry-pi raspbian systemd