[SOLVED] Can't understand how `install` command works

Hi there:
I'm trying to make a PKGBUILD for pgModeler, which comes pre-compiled, so I think what I should do is to move the application directory completely to /opt/pgmodeler and make a symbolic link from /usr/bin to the /opt/pgmodeler/start-pgmodeler.sh script. So, i just wrote this:
pkgname=pgmodeler
pkgver=0.4.1
pkgrel=1
pkgdesc="An open source tool for modeling PostgreSQL databases"
arch=('x86_64')
url="http://pgmodeler.com.br"
license=('GPL3')
source=("http://www.pgmodeler.com.br/releases/$pkgname-$pkgver-linux64.tar.gz" "pgmodeler.desktop")
md5sums=('574887c35bc9e0a1bc65f8d4494200bb' '1f3ebda62e941ea7ea17cfb609cc392e')
depends=(libpqxx)
package() {
install -Dm644 "$srcdir/$pkgname-$pkgver-linux64" "$pkgdir/opt/$pkgname"
install -Dm644 "$srcdir/$pkgname.desktop" "$pkgdir/usr/share/applications/$pkgname.desktop"
install -Dm644 "$srcdir/$pkgname-$pkgver-linux64/pgmodeler_logo.png" "$pkgdir/usr/share/pixmaps/$pkgname.png"
chmod 755 "$pkgdir/opt/$pkgname/start-pgmodeler.sh"
ln -s "$pkgdir/opt/$pkgname/start-pgmodeler.sh" "$pkgdir/usr/bin/$pkgname"
But it fails in the first line of the package() function:
[tae@localhost pgmodeler]$ makepkg -s
==> Making package: pgmodeler 0.4.1-1 (Sun Mar 17 23:03:08 CLST 2013)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Retrieving Sources...
-> Found pgmodeler-0.4.1-linux64.tar.gz
-> Found pgmodeler.desktop
==> Validating source files with md5sums...
pgmodeler-0.4.1-linux64.tar.gz ... Passed
pgmodeler.desktop ... Passed
==> Extracting Sources...
-> Extracting pgmodeler-0.4.1-linux64.tar.gz with bsdtar
==> Removing existing pkg/ directory...
==> Entering fakeroot environment...
==> Starting package()...
install: omitting directory ‘/home/tae/GitHub/pgmodeler/src/pgmodeler-0.4.1-linux64’
==> ERROR: A failure occurred in package().
Aborting...
This is my first PKGBUILD and I'm trying to decipher how to make it by looking at this files: https://aur.archlinux.org/packages/dr/dropbox/PKGBUILD and https://aur.archlinux.org/packages/op/opcion/PKGBUILD and I never used the install command before so I'm pretty lost.
Thanks beforehand.
Last edited by Tae (2013-03-19 12:44:45)

Thanks to all. I learned a couple of stuff, but I still have no luck. This is what I've tried:
I wrote install -d "$pkgdir/opt" in the first line of the package() function before ask, but it didn't make any difference. In fact, I'm not sure what it does (from its man page: treat all arguments as directory names; create all components of the specified directories).
I modified the function with all your suggestions, and now it looks:
package() {
cp -R "$srcdir/$pkgname-$pkgver-linux64" "$pkgdir/opt/$pkgname"
chmod 644 "$pkgdir/opt/$pkname/"
chmod 755 "$pkgdir/opt/$pkgname/start-pgmodeler.sh"
install -Dm644 "$srcdir/$pkgname.desktop" "$pkgdir/usr/share/applications/$pkgname.desktop"
install -Dm644 "$pkgdir/opt/$pkgname/pgmodeler_logo.png" "$pkgdir/usr/share/pixmaps/$pkgname.png"
ln -s "/opt/$pkgname/start-pgmodeler.sh" "$pkgdir/usr/bin/$pkgname/"
but I get:
$ makepkg -s
==> Making package: pgmodeler 0.4.1-1 (lun mar 18 20:33:53 CLST 2013)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Retrieving Sources...
-> Found pgmodeler-0.4.1-linux64.tar.gz
-> Found pgmodeler.desktop
==> Validating source files with md5sums...
pgmodeler-0.4.1-linux64.tar.gz ... Passed
pgmodeler.desktop ... Passed
==> Extracting Sources...
-> Extracting pgmodeler-0.4.1-linux64.tar.gz with bsdtar
==> Removing existing pkg/ directory...
==> Entering fakeroot environment...
==> Starting package()...
cp: cannot create directory ‘/home/tae/GitHub/pgModeler/pkg/opt/pgmodeler’: No such file or directory
==> ERROR: A failure occurred in package().
Aborting...
Here I can't understand why it tries to create /opt/pgmodeler inside the pkg/ directory. For what I found in other PKGBUILDs and from the $pkgdir definition of the PKGBUILD man page (This contains the directory where makepkg bundles the installed package (this directory will become the root directory of your built package)) I though it will be the root directory.
So I removed all the $pkgdir from the function and now I get this error:
mkdir: cannot create directory ‘/opt/pgmodeler/’: Permission denied

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