* ```
$ rm project.refs
$ bst source track pkgs/fonts/twemoji.bst
[...]
Track failure on element: pkgs/fonts/twemoji.bst
[...]
Choice: [continue]: r
Retrying failed job
[--:--:--][????????][   track:pkgs/fonts/twemoji.bst        ] START   carbonOS/pkgs-fonts-twemoji/????????-track.2231251.log
[--:--:--][????????][   track:pkgs/fonts/twemoji.bst        ] START   Tracking https://kojipkgs.fedoraproject.org//packages/twitter-twemoji-fonts/14.0.2/3.fc38/noarch/twitter-twemoji-fonts-14.0.2-3.fc38.noarch.rpm
[00:00:00][????????][   track:pkgs/fonts/twemoji.bst        ] SUCCESS Tracking https://kojipkgs.fedoraproject.org//packages/twitter-twemoji-fonts/14.0.2/3.fc38/noarch/twitter-twemoji-fonts-14.0.2-3.fc38.noarch.rpm
[--:--:--][????????][   track:pkgs/fonts/twemoji.bst        ] START   Tracking master from https://github.com/rpm-software-management/rpm
[00:00:00][????????][   track:pkgs/fonts/twemoji.bst        ] SUCCESS Tracking master from https://github.com/rpm-software-management/rpm
[--:--:--][????????][   track:pkgs/fonts/twemoji.bst        ] INFO    Found new revision: ('2043f2ac57ae2690cc1b11242f040085df8eed83', [])
[00:00:01][????????][   track:pkgs/fonts/twemoji.bst        ] SUCCESS carbonOS/pkgs-fonts-twemoji/????????-track.2231251.log
[00:00:02][        ][    main:core activity                 ] SUCCESS Track
[...]
$ cat project.refs
projects:
  carbonOS:
    pkgs/fonts/twemoji.bst:
    - {}
    - {}
    - ref: 2043f2ac57ae2690cc1b11242f040085df8eed83
$ bst source track pkgs/fonts/twemoji.bst
[...]
[--:--:--][????????][   track:pkgs/fonts/twemoji.bst        ] START   carbonOS/pkgs-fonts-twemoji/????????-track.2231963.log
[--:--:--][????????][   track:pkgs/fonts/twemoji.bst        ] START   Tracking https://kojipkgs.fedoraproject.org//packages/twitter-twemoji-fonts/14.0.2/3.fc38/noarch/twitter-twemoji-fonts-14.0.2-3.fc38.noarch.rpm
[00:00:00][????????][   track:pkgs/fonts/twemoji.bst        ] SUCCESS Tracking https://kojipkgs.fedoraproject.org//packages/twitter-twemoji-fonts/14.0.2/3.fc38/noarch/twitter-twemoji-fonts-14.0.2-3.fc38.noarch.rpm
[--:--:--][????????][   track:pkgs/fonts/twemoji.bst        ] INFO    Found new revision: a842447e8610bce8a0564a91604a2988220285b5f60b0396440ead230ac6b1ec
[--:--:--][????????][   track:pkgs/fonts/twemoji.bst        ] START   Staging local files into CAS
[00:00:00][????????][   track:pkgs/fonts/twemoji.bst        ] SUCCESS Staging local files into CAS
[--:--:--][????????][   track:pkgs/fonts/twemoji.bst        ] START   Tracking master from https://github.com/rpm-software-management/rpm
[00:00:01][????????][   track:pkgs/fonts/twemoji.bst        ] SUCCESS Tracking master from https://github.com/rpm-software-management/rpm
[00:00:02][????????][   track:pkgs/fonts/twemoji.bst        ] SUCCESS carbonOS/pkgs-fonts-twemoji/????????-track.2231963.log
[00:00:02][        ][    main:core activity                 ] SUCCESS Track
[...]
$ cat project.refs
projects:
  carbonOS:
    pkgs/fonts/twemoji.bst:
    - ref: a842447e8610bce8a0564a91604a2988220285b5f60b0396440ead230ac6b1ec
    - {}
    - ref: 2043f2ac57ae2690cc1b11242f040085df8eed83
```