Coverage for https://github.com/aptly-dev/aptly/pull/1488 #1521
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It tries to find dangling references but repo has no reference list and
it ended up with a nice trace
```
root@hostname:/usr/scratch/agustin/aptly-stress-tester# aptly db recover
Recovering database...
Checking database integrity...
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x13b9c24]
goroutine 1 [running]:
github.com/aptly-dev/aptly/cmd.Run.func1()
/home/tin/projects/aptly/cmd/run.go:17 +0xc5
panic({0x15abf60?, 0x2da1650?})
/usr/local/go/src/runtime/panic.go:792 +0x132
github.com/aptly-dev/aptly/deb.(*PackageRefList).ForEach(...)
/home/tin/projects/aptly/deb/reflist.go:83
github.com/aptly-dev/aptly/deb.FindDanglingReferences(...)
/home/tin/projects/aptly/deb/find_dangling.go:15
github.com/aptly-dev/aptly/cmd.checkRepo(0xc0015827e0)
/home/tin/projects/aptly/cmd/db_recover.go:63 +0xa4
github.com/aptly-dev/aptly/cmd.checkIntegrity.(*LocalRepoCollection).ForEach.func1({0xc0002fc2d0?, 0xc0010c2018?, 0x1?}, {0xc11004c000, 0xb9, 0xe0})
/home/tin/projects/aptly/deb/local.go:229 +0xa7
github.com/aptly-dev/aptly/database/goleveldb.(*storage).ProcessByPrefix(0xc0005ae140?, {0xc0010c2018, 0x1, 0x1}, 0xc00107be40)
/home/tin/projects/aptly/database/goleveldb/storage.go:114 +0x184
github.com/aptly-dev/aptly/deb.(*LocalRepoCollection).ForEach(...)
/home/tin/projects/aptly/deb/local.go:222
github.com/aptly-dev/aptly/cmd.checkIntegrity()
/home/tin/projects/aptly/cmd/db_recover.go:51 +0x7f
github.com/aptly-dev/aptly/cmd.aptlyDBRecover(0x40ed4e?, {0xc0003b5c30?, 0x2?, 0xc00057bdb0?})
/home/tin/projects/aptly/cmd/db_recover.go:27 +0x93
github.com/smira/commander.(*Command).Dispatch(0xc00052c900, {0xc0003b5c30, 0x0, 0x0})
/go/pkg/mod/github.com/smira/[email protected]/commands.go:305 +0xd1
github.com/smira/commander.(*Command).Dispatch(0xc00052ca20, {0xc0003b5c30, 0x1, 0x1})
/go/pkg/mod/github.com/smira/[email protected]/commands.go:283 +0x165
github.com/smira/commander.(*Command).Dispatch(0xc000516000, {0xc0003b5c20, 0x2, 0x2})
/go/pkg/mod/github.com/smira/[email protected]/commands.go:283 +0x165
github.com/aptly-dev/aptly/cmd.Run(0xc000516000, {0xc000194280?, 0x0?, 0x24a5bc8?}, 0x1)
/home/tin/projects/aptly/cmd/run.go:41 +0x1b9
main.main()
/home/tin/projects/aptly/main.go:27 +0x10d
```
After applying the fix you get
```
root@hostname:~/aptly-stress-tester# aptly db recover
Recovering database...
Checking database integrity...
Warning: Repo "stress_test_repo_3532" has no reference list (severely corrupted), initializing empty list
Warning: Repo "stress_test_repo_9244" has no reference list (severely corrupted), initializing empty list
```
Also it tries better to avoid nil references in repos, and snapshots
neolynx
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Coverage for #1488