Unable to run on Android in Termux

[Zambito1]

I attempted to install with both go install github.com/basecamp/basecamp-cli/cmd/basecamp@latest and from the install script. In both cases, I got this SIGSYS error and trace:

 $ basecamp -h
SIGSYS: bad system call
PC=0x1b6c0 m=0 sigcode=1

goroutine 1 gp=0x731b5421e0 m=0 mp=0x16c1ae0 [syscall, locked to thread]:
syscall.Syscall6(0x1b7, 0xffffffffffffff9c, 0x731b688380, 0x1, 0x200, 0x0, 0x0)
        syscall/syscall_linux.go:96 +0x2c fp=0x731b620bc0 sp=0x731b620b60 pc=0xea28c
syscall.faccessat2(0xffffffffffffff9c, {0x731b688300?, 0x731b688340?}, 0x1, 0x200)
        syscall/zsyscall_linux_arm64.go:33 +0x80 fp=0x731b620c20 sp=0x731b620bc0 pc=0xe73a0
syscall.Faccessat(0xffffffffffffff9c, {0x731b688300, 0x38}, 0x1, 0x200)
        syscall/syscall_linux.go:167 +0x3c fp=0x731b620d00 sp=0x731b620c20 pc=0xe500c
internal/syscall/unix.Eaccess(...)
        internal/syscall/unix/eaccess.go:23
os/exec.findExecutable({0x731b688300, 0x38})
        os/exec/lp_unix.go:31 +0x64 fp=0x731b620d50 sp=0x731b620d00 pc=0x458714
os/exec.lookPath({0xb464a1, 0x14})
        os/exec/lp_unix.go:67 +0x244 fp=0x731b620df0 sp=0x731b620d50 pc=0x458a84
os/exec.LookPath(...)
        os/exec/lookpath.go:29
github.com/atotto/clipboard.init.0()
        github.com/atotto/clipboard@v0.1.4/clipboard_unix.go:80 +0x2b8 fp=0x731b620e10 sp=0x731b620df0 pc=0x742ca8
runtime.doInit1(0x15a2b30)
        runtime/proc.go:8103 +0xc4 fp=0x731b620f30 sp=0x731b620e10 pc=0x6e364
runtime.doInit(...)
        runtime/proc.go:8070
runtime.main()
        runtime/proc.go:258 +0x244 fp=0x731b620fd0 sp=0x731b620f30 pc=0x5e474
runtime.goexit({})
        runtime/asm_arm64.s:1447 +0x4 fp=0x731b620fd0 sp=0x731b620fd0 pc=0x99424

goroutine 2 gp=0x731b542780 m=nil [force gc (idle)]:
runtime.gopark(0x0?, 0x0?, 0x0?, 0x0?, 0x0?)
        runtime/proc.go:462 +0xbc fp=0x731b5b2f90 sp=0x731b5b2f70 pc=0x91e3c
runtime.goparkunlock(...)
        runtime/proc.go:468
runtime.forcegchelper()
        runtime/proc.go:375 +0xb4 fp=0x731b5b2fd0 sp=0x731b5b2f90 pc=0x5e804
runtime.goexit({})
        runtime/asm_arm64.s:1447 +0x4 fp=0x731b5b2fd0 sp=0x731b5b2fd0 pc=0x99424
created by runtime.init.7 in goroutine 1
        runtime/proc.go:363 +0x24

goroutine 3 gp=0x731b542d20 m=nil [GC sweep wait]:
runtime.gopark(0x0?, 0x0?, 0x0?, 0x0?, 0x0?)
        runtime/proc.go:462 +0xbc fp=0x731b5b3770 sp=0x731b5b3750 pc=0x91e3c
runtime.goparkunlock(...)
        runtime/proc.go:468
runtime.bgsweep(0x731b5d2000)
        runtime/mgcsweep.go:279 +0x9c fp=0x731b5b37b0 sp=0x731b5b3770 pc=0x48d5c
runtime.gcenable.gowrap1()
        runtime/mgc.go:214 +0x20 fp=0x731b5b37d0 sp=0x731b5b37b0 pc=0x3a290
runtime.goexit({})
        runtime/asm_arm64.s:1447 +0x4 fp=0x731b5b37d0 sp=0x731b5b37d0 pc=0x99424
created by runtime.gcenable in goroutine 1
        runtime/mgc.go:214 +0x6c

goroutine 4 gp=0x731b542f00 m=nil [GC scavenge wait]:
runtime.gopark(0x731b5d2000?, 0xdc6db0?, 0x1?, 0x0?, 0x731b542f00?)
        runtime/proc.go:462 +0xbc fp=0x731b5b3f60 sp=0x731b5b3f40 pc=0x91e3c
runtime.goparkunlock(...)
        runtime/proc.go:468
runtime.(*scavengerState).park(0x16bf600)
        runtime/mgcscavenge.go:425 +0x5c fp=0x731b5b3f90 sp=0x731b5b3f60 pc=0x4695c
runtime.bgscavenge(0x731b5d2000)
        runtime/mgcscavenge.go:653 +0x44 fp=0x731b5b3fb0 sp=0x731b5b3f90 pc=0x46e74
runtime.gcenable.gowrap2()
        runtime/mgc.go:215 +0x20 fp=0x731b5b3fd0 sp=0x731b5b3fb0 pc=0x3a250
runtime.goexit({})
        runtime/asm_arm64.s:1447 +0x4 fp=0x731b5b3fd0 sp=0x731b5b3fd0 pc=0x99424
created by runtime.gcenable in goroutine 1
        runtime/mgc.go:215 +0xac

goroutine 17 gp=0x731b6043c0 m=nil [GOMAXPROCS updater (idle)]:
runtime.gopark(0x0?, 0x0?, 0x0?, 0x0?, 0x0?)
        runtime/proc.go:462 +0xbc fp=0x731b5ae770 sp=0x731b5ae750 pc=0x91e3c
runtime.goparkunlock(...)
        runtime/proc.go:468
runtime.updateMaxProcsGoroutine()
        runtime/proc.go:7095 +0xf4 fp=0x731b5ae7d0 sp=0x731b5ae770 pc=0x6d064
runtime.goexit({})
        runtime/asm_arm64.s:1447 +0x4 fp=0x731b5ae7d0 sp=0x731b5ae7d0 pc=0x99424
created by runtime.defaultGOMAXPROCSUpdateEnable in goroutine 1
        runtime/proc.go:7083 +0x48

goroutine 18 gp=0x731b6045a0 m=nil [finalizer wait]:
runtime.gopark(0x731b5b25b8?, 0x33d40?, 0xd8?, 0x25?, 0x5eaa4?)
        runtime/proc.go:462 +0xbc fp=0x731b5b2580 sp=0x731b5b2560 pc=0x91e3c
runtime.runFinalizers()
        runtime/mfinal.go:210 +0x100 fp=0x731b5b27d0 sp=0x731b5b2580 pc=0x392b0
runtime.goexit({})
        runtime/asm_arm64.s:1447 +0x4 fp=0x731b5b27d0 sp=0x731b5b27d0 pc=0x99424
created by runtime.createfing in goroutine 1
        runtime/mfinal.go:172 +0x78

r0      0xffffffffffffff9c
r1      0x731b688380
r2      0x1
r3      0x200
r4      0x0
r5      0x0
r6      0x0
r7      0x2
r8      0x1b7
r9      0x1
r10     0x2f7273752f73656c
r11     0x6d7265742f6e6962
r12     0x6270696c632d7875
r13     0x7465732d6472616f
r14     0x4
r15     0x27f540545cc4
r16     0x731b6203a0
r17     0x731b620ca0
r18     0x0
r19     0xe
r20     0x7fed917e60
r21     0x16c1ae0
r22     0x731b544000
r23     0x3cb9d69707
r24     0x0
r25     0x52349a7031f4916
r26     0xdc62d8
r27     0x2
r28     0x731b5421e0
r29     0x731b620af8
lr      0xea1d0
sp      0x731b620b00
pc      0x1b6c0
fault   0x0

[Zambito1]

I was able to clone the repository and build using make build. I had to update the go.mod file to remove the patch from the target Go version, making it 1.26 instead of 1.26.4, because I only have 1.26.3 installed. That worked. The prebuild package and the binary installed with go install did not work as I mentioned.

[robzolkos]

Thanks for the detailed report and the stack trace — that made this quick to pin down.

Root cause. The crash happens in package initialization, before main runs:

github.com/atotto/clipboard.init.0()  →  os/exec.LookPath  →  faccessat2 (syscall 0x1b7)  →  SIGSYS

atotto/clipboard — an indirect dependency we pull in through the TUI (charm.land/bubbles/v2/textinput) — calls exec.LookPath in its package init() to probe for clipboard tools. On Termux, Android's seccomp policy kills the resulting faccessat2 syscall with SIGSYS. Because it's in init(), it fires before anything the CLI controls, which is why even basecamp --help dies.

That also explains why make build worked for you: Termux's Go toolchain is patched to avoid syscalls Android's seccomp rejects, so a locally built binary sidesteps faccessat2. Our prebuilt binaries and go install @latest use upstream Go, which doesn't.

Why we can't fix this in the CLI right now. I looked at the obvious options and none are safe:

• Bump the dependency — bubbles/v2 v2.1.0 (already our version) is the latest, and it still imports atotto/clipboard.
• A replace directive to lazy-load clipboard — go install pkg@latest errors out when the target module's go.mod has replace/exclude directives, so this would break installs on every platform, not just Termux.
• Build-tag the TUI out — it's woven into the output/render paths and many everyday commands, so it can't be cleanly excluded.

The durable fix is upstream: textinput initializing clipboard lazily instead of in init().

In the meantime, the supported path on Termux is building from source with Termux's Go (which you already found works):

pkg install golang git
git clone https://github.com/basecamp/basecamp-cli
cd basecamp-cli
go build -o basecamp ./cmd/basecamp   # or: make build

As you noted, if your Termux Go is a slightly older patch release than our toolchain line, lower the go/toolchain line in go.mod to match. I've documented this in #515.