chezmoi on Android can't connect to Internet/DNS

[ErrrorMaxx]

Describe the bug

chezmoi on Android sometimes can't connect to DNS. So it can't download externals

To reproduce

Idk, it just sometimes work and sometimes it doesn't

Expected behavior

No errors, externals are always can be downloaded

Output of command with the --verbose flag

$ chezmoi --verbose diff
chezmoi: Get "https://github.com/macvk/dnsleaktest/raw/HEAD/dnsleaktest.py": dial tcp: lookup github.com on [::1]:53: read udp [::1]:50174->[::1]:53: read: connection refused

$ chezmoi doctor
RESULT    CHECK                       MESSAGE
failed    latest-version              Get "https://api.github.com/repos/twpayne/chezmoi/releases/latest": dial tcp: lookup api.github.com on [::1]:53: read udp [::1]:57535->[::1]:53: read: connection refused

Output of chezmoi doctor

```console $ chezmoi doctor RESULT CHECK MESSAGE ok version v2.47.0, commit 39bd915f446068862cc3064edb6dbeee795785ca, built at 2024-02-25T20:56:37Z, built by goreleaser failed latest-version Get "https://api.github.com/repos/twpayne/chezmoi/releases/latest": dial tcp: lookup api.github.com on [::1]:53: read udp [::1]:54920->[::1]:53: read: connection refused ok os-arch android/arm64 ok uname Linux localhost 4.19.191+ #1 SMP PREEMPT Wed Nov 29 21:44:22 CST 2023 aarch64 Android ok go-version go1.22.0 (gc) ok executable ~/.local/bin/chezmoi ok upgrade-method replace-executable ok config-file ~/.config/chezmoi/chezmoi.yaml, last modified 2024-02-27T15:51:50Z warning source-dir ~/.local/share/chezmoi is a git working tree (dirty) warning suspicious-entries ~/.local/share/chezmoi/home/dot_config/rootmoi/chezmoi.yaml.tmpl warning working-tree ~/.local/share/chezmoi is a git working tree (dirty) warning dest-dir ~ is a git working tree (dirty) warning umask 077 ok cd-command found /data/data/com.termux/files/usr/bin/zsh ok cd-args /data/data/com.termux/files/usr/bin/zsh info diff-command not set ok edit-command found /data/data/com.termux/files/usr/bin/micro ok edit-args micro ok git-command found /data/data/com.termux/files/usr/bin/git, version 2.44.0 warning merge-command vimdiff not found in $PATH ok shell-command found /data/data/com.termux/files/usr/bin/zsh ok shell-args /data/data/com.termux/files/usr/bin/zsh info age-command age not found in $PATH ok gpg-command found /data/data/com.termux/files/usr/bin/gpg, version 2.4.4 info pinentry-command not set info 1password-command op not found in $PATH info bitwarden-command bw not found in $PATH info bitwarden-secrets-command bws not found in $PATH info dashlane-command dcli not found in $PATH info doppler-command doppler not found in $PATH info gopass-command gopass not found in $PATH info keepassxc-command keepassxc-cli not found in $PATH info keepassxc-db not set info keeper-command keeper not found in $PATH info lastpass-command lpass not found in $PATH info pass-command pass not found in $PATH info passhole-command ph not found in $PATH info rbw-command rbw not found in $PATH info vault-command vault not found in $PATH info vlt-command vlt not found in $PATH info secret-command not set ```

[twpayne]

This is something to do with your system. This is not a bug in chezmoi.

[ErrrorMaxx]

After switching to Termux's chezmoi I found out that after diffing with Termux build (and when all externals are downloaded), then diffing with official build works again (using cached externals). So turns out that android build without some Termux patches works only partially

$ /data/data/com.termux/files/home/.local/bin/chezmoi diff
chezmoi: Get "https://github.com/macvk/dnsleaktest/raw/HEAD/dnsleaktest.py": dial tcp: lookup github.com on [::1]:53: read udp [::1]:48172->[::1]:53: read: connection refused

$ /data/data/com.termux/files/usr/bin/chezmoi diff
*diff here*

$ /data/data/com.termux/files/home/.local/bin/chezmoi diff
*diff here*

UPD: I did some research and Termux actually has a patch for golang: termux/termux-packages/packages/golang/fix-hardcoded-etc-resolv-conf.sh which fixes DNS resolving on Android

UPD2: This is actually a bug of golang on Android: https://github.com/golang/go/issues/8877

[twpayne]

Thanks for the further investigation and apologies for the too-hasty fix.

If I understand correctly, there are two ways for chezmoi to work around this bug in Go:

1. Build the Android binaries with cgo. This will require the Android SDK.
2. Add a user-configurable DNS server in chezmoi's config and use that on Android.
3. Use https://github.com/mtibben/androiddnsfix.

Of these, (1) is the cleanest but might not be supported by goreleaser (the tool chezmoi uses to build its release binaries), (2) has poor user experience, and (3) strikes me as too much of a hack.

Does the Termux-built chezmoi binary have this same problem?

[ErrrorMaxx]

Patch in Termux is for golang itself. So any binaries built in Termux are patched:

$ gitcd https://github.com/twpayne/chezmoi repos/chezmoi
Cloning into 'repos/chezmoi'...
remote: Enumerating objects: 76049, done.
remote: Counting objects: 100% (5230/5230), done.
remote: Compressing objects: 100% (583/583), done.
remote: Total 76049 (delta 4748), reused 4696 (delta 4627), pack-reused 70819
Receiving objects: 100% (76049/76049), 70.23 MiB | 4.79 MiB/s, done.
Resolving deltas: 100% (42413/42413), done.

$ go build
...

$ ./chezmoi diff -R
*diff here* (externals downloaded)

[twpayne]

For info, goreleaser is adding support for Termux in https://github.com/goreleaser/goreleaser/pull/4901, which will be part of goreleaser v2.1.0 (not released yet).