Switch to locked signed commit in snapshot sources

Upstream has deleted the signed source tarball for `6.4-20230520`, so we
are building from signed snapshot sources.

Signed-off-by: David Runge <dvzrv@archlinux.org>

PKGBUILD

@@ -5,6 +5,7 @@
 
 pkgname=ncurses
 pkgver=6.4_20230520
+_commit=c74a1c4202f4524076da8be8554dacec391c84b2  # refs/tags/v6_4_20230520
 pkgrel=1
 pkgdesc='System V Release 4.0 curses emulation library'
 arch=(x86_64)
@@ -16,6 +17,7 @@ depends=(
 )
 makedepends=(
   autoconf-archive
+  git
 )
 optdepends=('bash: for ncursesw6-config')
 provides=(
@@ -27,26 +29,29 @@ provides=(
 )
 replaces=(alacritty-terminfo)
 source=(
-  https://invisible-mirror.net/archives/$pkgname/current/$pkgname-${pkgver/_/-}.tgz{,.asc}
+  $pkgname::git+https://github.com/ThomasDickey/ncurses-snapshots.git?signed#commit=$_commit
   $pkgname-6.3-libs.patch
   $pkgname-6.3-pkgconfig.patch
 )
-sha512sums=('bbb1dd33f4c701165b7612657a7577d3175b94c5815a89eaab3a8774510feb9322d284896dba8d3896f6dd89a8b98031829a76f7e3397aebb6cf2a71e989f93c'
-            'SKIP'
+sha512sums=('94fd092907471539fbf8f8e65e353a870fca5b35af06803b111dfca193a7b3112f1a9b659e7876d5d58f3008bae45aa0f5d43f4ab805b45ec063ed1930629c10'
             'adb02b838c40f1e58a1b31c26d5cd0f2a1c43f3b6d68e839981764c0f6c905a9eb51dd36ff018628fdeb20747cc7467727d57135408ab4848259384077a52b28'
             '2d2c0ec3c880e638ab4aa3dbff5e28e4cd233153e24816bd87e077f848aa3edd5114cd0f2a7f6e8869dd1861a2746e512886c18264ff1676927dcc320c5ef958')
-b2sums=('d5e88198140ab6471a36bef08685e17ac2e43b4e66b53abaa961d5f8912eb3eae3784db194436c2b3e5f2deaeefaaed93e0550bcab0456f1486fc35d0cdac440'
-        'SKIP'
+b2sums=('7df6d10b7807cebd5706e730b783ae2405aaba1958488edf3c9c17c6bbeac1c9d259ec27aa6ea1a57cd4e997eab7e58ea52351b19dbfeb32ee045d19e9f6ca01'
         '31bb10e82dd018a75e57252052650d9f0f5eb5e7e887118c2ea40032b11f59ec6aa4d9bae804c615cbecdf3382f3434e0c9e9e8440fdefe66a507be020b8965c'
         'fb6cf606cf3db7f6b306272696a63bce83d52cfa91e850f9a7bdb9d3d8455a26943529a9cf79731dddc7f763c27211a9afab9c4c31dbb6d12fd720eb390eb0a3')
 validpgpkeys=('19882D92DDA4C400C22C0D56CC2AF4472167BE03')  # Thomas Dickey <dickey@invisible-island.net>
 
+pkgver() {
+  cd $pkgname
+  git describe --tags | sed 's/\([^-]*-g\)/r\1/;s/-/./g;s/v//g;s/_/./'
+}
+
 prepare() {
   # do not link against test libraries
-  patch -Np1 -d $pkgname-${pkgver/_/-} -i ../$pkgname-6.3-libs.patch
+  patch -Np1 -d $pkgname -i ../$pkgname-6.3-libs.patch
   # do not leak build-time LDFLAGS into the pkgconfig files:
   # https://bugs.archlinux.org/task/68523
-  patch -Np1 -d $pkgname-${pkgver/_/-} -i ../$pkgname-6.3-pkgconfig.patch
+  patch -Np1 -d $pkgname -i ../$pkgname-6.3-pkgconfig.patch
   # NOTE: can't run autoreconf because the autotools setup is custom and ancient
 }
 
@@ -69,7 +74,7 @@ build() {
     --without-ada
   )
 
-  cd $pkgname-${pkgver/_/-}
+  cd $pkgname
   ./configure "${configure_options[@]}"
   make
 }
@@ -77,8 +82,8 @@ build() {
 package() {
   local _pkgver=${pkgver/_*/}
 
-  make DESTDIR="$pkgdir" install -C $pkgname-${pkgver/_/-}
-  install -vDm 644 $pkgname-${pkgver/_/-}/COPYING -t "$pkgdir/usr/share/licenses/$pkgname/"
+  make DESTDIR="$pkgdir" install -C $pkgname
+  install -vDm 644 $pkgname/COPYING -t "$pkgdir/usr/share/licenses/$pkgname/"
 
   # fool packages looking to link to non-wide-character ncurses libraries
   for lib in ncurses ncurses++ form panel menu; do