Fix Alpine minirootfs download and verification (#122)

- Download and verify PGP signature instead of sha256 sum
- Add public key ncopa.asc:
  0482d84022f52df1c4e7cd43293acd0907d9495a
  Natanael Copa <[email protected]>

Author: bastimeyer

scripts/chroot/chroot_build.sh

@@ -2,6 +2,8 @@
 
 set -ex
 
+ALPINE_RELEASE="3.21.0"
+
 if [ -z "${ALPINE_ARCH}" ]; then
     echo "Usage: env ALPINE_ARCH=<arch> $0"
     echo "Example values: x86_64 x86 armhf aarch64"
@@ -35,10 +37,13 @@ cd "$tempdir"
 # Download and extract minimal Alpine system
 #############################################
 
-ALPINE_RELEASE="3.21.0"
-wget "http://dl-cdn.alpinelinux.org/alpine/v${ALPINE_RELEASE%.*}/releases/${ALPINE_ARCH}/alpine-minirootfs-${ALPINE_RELEASE}-${ALPINE_ARCH}.tar.gz"
-wget "http://dl-cdn.alpinelinux.org/alpine/v${ALPINE_RELEASE%.*}/releases/${ALPINE_ARCH}/alpine-minirootfs-${ALPINE_RELEASE}-${ALPINE_ARCH}.tar.gz.sha256"
-sha256sum -c alpine-minirootfs-${ALPINE_RELEASE}-${ALPINE_ARCH}.tar.gz.sha256
+mkdir "${tempdir}/.gpg"
+chmod 700 "${tempdir}/.gpg"
+gpg2 --homedir "${tempdir}/.gpg" --verbose --import "${repo_root_dir}/scripts/chroot/ncopa.asc"
+
+wget "https://dl-cdn.alpinelinux.org/alpine/v${ALPINE_RELEASE%.*}/releases/${ALPINE_ARCH}/alpine-minirootfs-${ALPINE_RELEASE}-${ALPINE_ARCH}.tar.gz"
+wget "https://dl-cdn.alpinelinux.org/alpine/v${ALPINE_RELEASE%.*}/releases/${ALPINE_ARCH}/alpine-minirootfs-${ALPINE_RELEASE}-${ALPINE_ARCH}.tar.gz.asc"
+gpg2 --homedir "${tempdir}/.gpg" --verify "alpine-minirootfs-${ALPINE_RELEASE}-${ALPINE_ARCH}.tar.gz.asc"
 
 mkdir -p ./miniroot
 cd ./miniroot

scripts/chroot/ncopa.asc

@@ -0,0 +1,52 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+Version: GnuPG v2
+
+mQINBFSIEDwBEADbib88gv1dBgeEez1TIh6A5lAzRl02JrdtYkDoPr5lQGYv0qKP
+lWpd3jgGe8n90krGmT9W2nooRdyZjZ6UPbhYSJ+tub6VuKcrtwROXP2gNNqJA5j3
+vkXQ40725CVig7I3YCpzjsKRStwegZAelB8ZyC4zb15J7YvTVkd6qa/uuh8H21X2
+h/7IZJz50CMxyz8vkdyP2niIGZ4fPi0cVtsg8l4phbNJ5PwFOLMYl0b5geKMviyR
+MxxQ33iNa9X+RcWeR751IQfax6xNcbOrxNRzfzm77fY4KzBezcnqJFnrl/p8qgBq
+GHKmrrcjv2MF7dCWHGAPm1/vdPPjUpOcEOH4uGvX7P4w2qQ0WLBTDDO47/BiuY9A
+DIwEF1afNXiJke4fmjDYMKA+HrnhocvI48VIX5C5+C5aJOKwN2EOpdXSvmsysTSt
+gIc4ffcaYugfAIEn7ZdgcYmTlbIphHmOmOgt89J+6Kf9X6mVRmumI3cZWetf2FEV
+fS9v24C2c8NRw3LESoDT0iiWsCHcsixCYqqvjzJBJ0TSEIVCZepOOBp8lfMl4YEZ
+BVMzOx558LzbF2eR/XEsr3AX7Ga1jDu2N5WzIOa0YvJl1xcQxc0RZumaMlZ81dV/
+uu8G2+HTrJMZK933ov3pbxaZ38/CbCA90SBk5xqVqtTNAHpIkdGj90v2lwARAQAB
+tCVOYXRhbmFlbCBDb3BhIDxuY29wYUBhbHBpbmVsaW51eC5vcmc+iQI2BBMBCAAg
+BQJUiBA8AhsDBQsJCAcCBhUICQoLAgMWAgECHgECF4AACgkQKTrNCQfZSVrcNxAA
+mEzX9PQaczzlPAlDe3m1AN0lP6E/1pYWLBGs6qGh18cWxdjyOWsO47nA1P+cTGSS
+AYe4kIOIx9kp2SxObdKeZTuZCBdWfQu/cuRE12ugQQFERlpwVRNd6NYuT3WyZ7v8
+ZXRw4f33FIt4CSrW1/AyM/vrA+tWNo7bbwr/CFaIcL8kINPccdFOpWh14erONd/P
+Eb3gO81yXIA6c1Vl4mce2JS0hd6EFohxS5yMQJMRIS/Zg8ufT3yHJXIaSnG+KRP7
+WWLR0ZaLraCykYi/EW9mmQ49LxQqvKOgjpRW9aNgDA+arKl1umjplkAFI1GZ0/qA
+sgKm4agdvLGZiCZqDXcRWNolG5PeOUUpim1f59pGnupZ3Rbz4BF84U+1uL+yd0OR
+5Y98AxWFyq0dqKz/zFYwQkMVnl9yW0pkJmP7r6PKj0bhWksQX+RjYPosj3wxPZ7i
+SKMX7xZaqon/CHpH9/Xm8CabGcDITrS6h+h8x0FFT/MV/LKgc3q8E4mlXelew1Rt
+xK4hzXFpXKl0WcQg54fj1Wqy47FlkArG50di0utCBGlmVZQA8nqE5oYkFLppiFXz
+1SXCXojff/XZdNF2WdgV8aDKOYTK1WDPUSLmqY+ofOkQL49YqZ9M5FR8hMAbvL6e
+4CbxVXCkWJ6Q9Lg79AzS3pvOXCJ/CUDQs7B30v026Ba5Ag0EVIgQPAEQAMHuPAv/
+B0KP9SEA1PsX5+37k46lTP7lv7VFd7VaD1rAUM/ZyD2fWgrJprcCPEpdMfuszfOH
+jGVQ708VQ+vlD3vFoOZE+KgeKnzDG9FzYXXPmxkWzEEqI168ameF/LQhN12VF1mq
+5LbukiAKx2ytb1I8onvCvNJDvH1D/3BxSj7ThV9bP/bFufcOHFBMFwtyBmUaR5Wx
+96Bq+7DEbTrxhshoQgUqILEudUyhZa05/TrpUvC4f8qc0deaqJFO1zD6guZxRWZd
+SWJdcFzTadyg36P4eyFMxa1Ft7BlDKdKLAFlCGgR0jfOnKRmdRKGRNFTLQ68aBld
+N4wxBuMwe0tmRw9zYwWwD43Aq9E26YtuxVR1wb3zUmi+47QH4ANAzMioimE9Mj5S
+qYrgzQJ0IGwIjBt+HNzHvYX+kyMuVFK41k2Vo6oUOVHuQMu3UgLvSPMsyw69d+Iw
+K/rrsQwuutrvJ8Qcda3rea1HvWBVcY/uyoRsOsCS7itS6MK6KKTKaW8iskmEb2/h
+Q1ZB1QaWm2sQ8Xcmb3QZgtyBfZKuC95T/mAXPT0uET6bTpP5DdEi3wFs+qw/c9FZ
+SNDZ4hfNuS24d2u3Rh8LWt/U83ieAutNntOLGhvuZm1jLYt2KvzXE8cLt3V75/ZF
+O+xEV7rLuOtrHKWlzgJQzsDp1gM4Tz9ULeY7ABEBAAGJAh8EGAEIAAkFAlSIEDwC
+GwwACgkQKTrNCQfZSVrIgBAArhCdo3ItpuEKWcxx22oMwDm+0dmXmzqcPnB8y9Tf
+NcocToIXP47H1+XEenZdTYZJOrdqzrK6Y1PplwQv6hqFToypgbQTeknrZ8SCDyEK
+cU4id2r73THTzgNSiC4QAE214i5kKd6PMQn7XYVjsxvin3ZalS2x4m8UFal2C9nj
+o8HqoTsDOSRy0mzoqAqXmeAe3X9pYme/CUwA6R8hHEgX7jUhm/ArVW5wZboAinw5
+BmKBjWiIwT1vxfvwgbC0EA1O24G4zQqEJ2ILmcM3RvWwtFFWasQqV7qnKdpD8EIb
+oPa8Ocl7joDc5seK8BzsI7tXN4Yjw0aHCOlZ15fWHPYKgDFRQaRFffODPNbxQNiz
+Yru3pbEWDLIUoQtJyKl+o2+8m4aWCYNzJ1WkEQje9RaBpHNDcyen5yC73tCEJsvT
+ZuMI4Xqc4xgLt8woreKE57GRdg2fO8fO40X3R/J5YM6SqG7y2uwjVCHFBeO2Nkkr
+8nOno+Rbn2b03c9MapMT4ll8jJds4xwhhpIjzPLWd2ZcX/ZGqmsnKPiroe9p1VPo
+lN72Ohr9lS+OXfvOPV2N+Ar5rCObmhnYbXGgU/qyhk1qkRu+w2bBZOOQIdaCfh5A
+Hbn3ZGGGQskgWZDFP4xZ3DWXFSWMPuvEjbmUn2xrh9oYsjsOGy9tyBFFySU2vyZP
+Mkc=
+=FcYC
+-----END PGP PUBLIC KEY BLOCK-----