Local backup succeeded but remote backup failed (Running as a systemd service)

[ViciousBadger]

Hey, I'm having a strange issue with remote backups, probably related to systemd's handling of $PATH and such.

I run my server in a systemd service because it generally works well, auto-restarts on failure and lets me run remote commands etc.

Here is the service file: (The /nix/store/[...] paths are because I run NixOS)

[Install]
WantedBy=default.target

[Service]
Environment=PATH=$PATH:/nix/store/h2zihm0hb2n4ha5g96prrmgi71ixxvlr-git-2.47.1/bin:/nix/store/755838ir1rbivbx7hfd95d5qhlxw5iaa-git-lfs-3.5.1/bin
ExecStart=/nix/store/4sz9aqdvqrpnawdxlvjbaxrmwn8ivivf-start-minecraft-server
Restart=on-failure
RestartSec=10
Sockets=minecraft.socket
StandardError=journal
StandardInput=socket
StandardOutput=journal
StartLimitBurst=100
Type=simple
WorkingDirectory=/home/minecraft/server/

[Unit]
After=network-online.target
Description=Minecraft server
Requires=minecraft-server.socket

For Fastback I added git and git-lfs to the service's "Environment" section and it seems like Fastback can work with this and create local backups fine. However, when trying to set up a remote file backup it fails, looking in the server log it prints out these messages:

[...]
[15:02:50] [pool-11-thread-2/ERROR]: [STDERR] failed to find custom transfer command "git-lfs" remote: executable file not found in $PATH
[15:02:50] [pool-11-thread-2/ERROR]: [STDERR] failed to find custom transfer command "git-lfs" remote: executable file not found in $PATH
[15:02:50] [pool-11-thread-2/ERROR]: [STDERR] error: failed to push some refs to 'file:///storage/backup/minecraft-server'
[15:02:50] [pool-11-thread-2/ERROR]: Exit 1 when executing: git -C /home/minecraft/server/world -c push.autosetupremote=false push --progress --set-upstream origin 9uZj/2025-01-15_15-02-49
net.pcal.fastback.utils.ProcessException: Exit 1 when executing: git -C /home/minecraft/server/world -c push.autosetupremote=false push --progress --set-upstream origin 9uZj/2025-01-15_15-02-49
        at knot/net.pcal.fastback.utils.ProcessUtils.doExec(ProcessUtils.java:81) ~[fastback-0.20.0+1.21.1-fabric.jar:?]
        at knot/net.pcal.fastback.utils.ProcessUtils.doExec(ProcessUtils.java:44) ~[fastback-0.20.0+1.21.1-fabric.jar:?]
        at knot/net.pcal.fastback.repo.PushUtils.native_doPush(PushUtils.java:133) ~[fastback-0.20.0+1.21.1-fabric.jar:?]
        at knot/net.pcal.fastback.repo.PushUtils.doPush(PushUtils.java:110) ~[fastback-0.20.0+1.21.1-fabric.jar:?]
        at knot/net.pcal.fastback.repo.RepoImpl.doCommitAndPush(RepoImpl.java:104) ~[fastback-0.20.0+1.21.1-fabric.jar:?]
        at knot/net.pcal.fastback.commands.FullCommand.lambda$run$1(FullCommand.java:65) ~[fastback-0.20.0+1.21.1-fabric.jar:?]
        at knot/net.pcal.fastback.commands.Commands.lambda$gitOp$0(Commands.java:131) ~[fastback-0.20.0+1.21.1-fabric.jar:?]
        at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572) ~[?:?]
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317) ~[?:?]
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) ~[?:?]
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) ~[?:?]
        at java.base/java.lang.Thread.run(Thread.java:1583) [?:?]

The first two messages are printed 30 times or so and they seem to indicate that git can't find git-lfs, which is strange because it works totally fine when creating a local backup. Do you know what could be different with remote file backups that could cause it to complain?

When I manually run the command git -C [...] shown in the error, it works fine, so that's nice at least.